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[20.07.2021] DARWIN and LZ join forces to build next-generation Dark Matter DetectorThe XENON/DARWIN and LUX-ZEPLIN (LZ) collaborations have now joined forces to work together on the design, construction, and operation of a new, single, multi-tonne scale xenon observatory to explore dark matter. The detector will be highly sensitive to a wide range of proposed dark matter particles and their interactions with visible matter. Over the last 20+ years, experiments using liquefied xenon targets have delivered world-leading results in the global quest for direct dark matter detection. This next-generation detector aims to continue the pursuit.
Dark matter makes up 85% of the matter in the Universe, but its nature remains a mystery. The direct identification of the dark matter particle is amongst the highest priorities in science and also one of the most challenging. The primary science goal of the new joint observatory is to reach a sensitivity for detecting dark matter in our galaxy by at least a factor of 10 beyond that of the current generation of detectors.
Laura Baudis from the University of Zurich and spokesperson of DARWIN says: "Xenon-based detectors are by far the most mature technology to detect dark matter in the upcoming years if nature decided to put it in reach of any direct detection instrument."
The current xenon-based experiments XENONnT and LUX-ZEPLIN will start their first science runs in 2021, to lead the race to detect the first signs of new particles and interactions. These experiments employ 5.9 and 7.0 tonnes of liquid xenon for the search, respectively. The LUX-ZEPLIN experiment operates at the Sanford Underground Research Facility (SURF) in the USA. The XENONnT experiment is located at the INFN Gran Sasso Laboratory (LNGS) in Italy. DARWIN is the evolution of the XENON program and includes additional groups, focusing on several R&D aspects required for the much larger detector.
Beyond its unparalleled sensitivity to dark matter, the detector's large mass and unprecedented low background level will also enable world-leading searches for additional signatures of physics beyond the Standard Model of particle physics that would similarly revolutionize our understanding of the universe. In particular, the secondary science goal will be the search for neutrinoless double-beta decay in xenon, shedding light on the nature of the neutrino and the imbalance of matter and antimatter in the universe. The observatory will also perform searches for other rare processes and particles such as axions, hypothetical particles that might be emitted from the Sun. It will also measure neutrinos created in the Sun, the Earth's atmosphere, and potentially those from Galactic supernovae.
The new multi-tonne liquid xenon detector will combine the most successful technologies employed in rare-event searches with xenon detectors, including those developed for XENONnT and LUX-ZEPLIN, and from targeted R&D including that supported under DARWIN. Marc Schumann from the University of Freiburg and co-spokesperson of DARWIN says: "We already have a rather clear idea what is needed for the new detector, however, the devil is in the details and lots of R&D is still needed."
After a very successful first joint workshop in April 2021, 104 research group leaders from 16 countries have signed a memorandum of understanding on July 6, 2021. Scientific cooperation has now begun to realize this next-generation rare event observatory.
[14.06.2021] Torino and Ferrara join DARWINTwo more groups which are already involved in the XENON program joined DARWIN on June 14, 2021, to strengthen the Italian DARWIN team: the Department of Physics and Earth Sciences and INFN Ferrara (PI Guido Zavattini) and the Instituto Nazionale di Astrofisica OATo and INFN Torino (PI Gian Carlo Trinchero).
[28.05.2021] Xenoscope: a 2.6m scale vertical DARWIN demonstratorIt requires lots of R&D to eventually design and construct a low-background detector as large as DARWIN. Two dedicated detector test platforms are currently being put into operation within the collaboration. One of them, the Xenoscope full-scale vertical demonstrator at the University of Zurich, was recently operated for the first time. The design and performance of the system dedicated to test electron drift and LXe purification over a distance of 2.6m is described in this article.
[27.04.2021] Joint workshop of the DARWIN and LZ CollaborationsMembers of the DARWIN and LZ collaborations have met in an online workshop to discuss the status of R&D towards a future dark matter detector with a multi-ton LXe target and to explore the possibilities to join forces towards a common goal. The DARWIN project is the contination of the XENON program at LNGS (Italy), which still places with XENON1T the most stringent contraints on the direct search for dark matter for most dark matter masses. Its successor XENONnT is currently under commissioning at LNGS and employ a 5.9t LXe target. The US-based LZ project at SURF (USA) is also under commissioning and features a 7.0t LXe target.
The agenda of the workshop can be found here.
[11.03.2021] Prof. Christopher Tunnell receives CAREER award for DARWIN R&DThe National Science Foundation (NSF) in the US has funded Prof. Tunnell's group at Rice University (Houston, TX) for 5 years through their CAREER program for DARWIN R&D. This will support methodological advancements specifically for neutrinoless double-beta decay in DARWIN. Specifically, the supported R&D is to apply novel machine-learning methods developed by his other project DIDACTS for robust physics-constrainted machine learning that is able to communicate uncertainty.
[10.03.2021] Second virtual DARWIN Collaboration MeetingThe DARWIN collaboration has met for its second virtual Collaboration meeting from March 8-10, 2021. More than 100 scientists discussed the progress of the R&D towards the DARWIN multi-ton LXe dark matter detector.
[22.12.2020] Jörn Mahlstedt receives grant for R&D work relevant for DARWINJörn Mahlstedt from the DARWIN group in Stockholm received a prestigious Starting Grant of the Swedish Research Council. In the next four years he will work on "Novel photosensors for future dark matter direct detection experiments", focusing on developing the ABALONE photosensor for use in liquid xenon. Such detector would be an ideally suited photodetector for DARWIN.
[21.11.2020] Prof. Tina Pollmann joins DARWIN Group at Nikhef/U AmsterdamWe are happy to announce that Tina Pollman, a new Assistant Professor at the University of Amsterdam and Nikhef, joined the DARWIN group at Nikhef/U Amsterdam. Tina is an expert on liquid noble gases and worked on DEAP-3600 before. Welcome Tina!
[11.09.2020] (Virtual) DARWIN Collaboration MeetingDue to the COVID-19 pandemic we had to cancel our planned DARWIN Collaboration meeting at LNGS and had to go "virtual" once more. Over three days about 100 DARWIN scientists from four continents discussed the status and the progress of the R&D towards the multi-ton liquid xenon DARWIN observatory.
[09.09.2020] Welcome Japan! Welcome Nagoya, Tokyo and Kobe!We are happy to announce that the three Japanese groups in XENON (and formerly XMASS) from Nagoya, Tokyo and Kobe joined DARWIN in September 2020. Their long-standing experience using liquid xenon as dark matter (and neutrino) target will be very beneficial for DARWIN. The PIs are Yoshitaka Itow (Nagoya), Kai Martens (Tokyo) and Kentaro Miuchi (Kobe).
[29.07.2020] DARWIN at virtual ICHEP 2020 ConferenceYet another online conference this year, however, ICHEP 2020 at Prague did not eliminate the parallel session talks which allowed many experiments to present their current status. DARWIN was presented by Adriano di Giovanni from NYU Abu Dhabi. The slides can be found here.
[21.07.2020] IJCLab group at Orsay receives funding for DARWIN R&DThe DARWIN group at IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie - at Orsay has received a grant from the Institut national de physique nucléaire et de physique des particules (IN2P3) to develop a design for the DARWIN TPC electrodes. The group led by Carla Macolino brings in ample expertise from the design, construction and qualification of the XENONnT electrodes. These have a diameter of ~1.45m, while the DARWIN electrodes need to be as large as 2.6m. This poses serious challenges which are being addressed in the new R&D campaign.
[20.07.2020] DARWIN featured at IDM 2020Also the bi-annually IDM conference, one of the major events for dark matter hunters, was held onlineonly this year. DARWIN was featured in the nice plenary overview on "Future dark matter experiments with noble liquids" by Carla Macolino. Here are the slides.
[24.06.2020] DARWIN at Neutrino 2020The international Neutrino 2020 conference has been held as "online-only" conference. Two posters from DARWIN members highlighted the sensitivity of the DARWIN observatory to neutrino physics:
[08.06.2020] Study on DARWIN's Sensitivity to Solar Neutrinos publishedA new study by the DARWIN collaboration shows that DARWIN, a 40t liquid xenon observatory with a very low background and a low threshold, will be capable to measure five solar neutrino components via elastic neutrino-electron scattering: pp, 7Be, 13N, 15O and pep, where the sensitity of the latter three would be optimized by depleting the target in 136Xe. The study is based on a realistic background model for the detector. The high statistics measurement of the pp-flux will allow for the first precision measurements of the weak mixing angle sin2(2θ) and the electron-neutrino survival probability Pee at low energies (see Figure). The precise measurements of the pp and 7Be fluxes will allow us constraining the solar luminosity and the combination of all flux measurements will shed light on the metallicity of solar models.
Publication: J. Aalbers et al. (DARWIN), Solar Neutrino Detection Sensitivity in DARWIN via Electron Scattering, arXiv:2006.03114.
[01.05.2020] Welcome Hamburg!We are excited to annount that yet another group joins us to develop the DARWIN LXe observatory: Belina von Krosigk (SuperCDMS) and her Emmy Noether group at the University of Hamburg, Germany, join DARWIN starting May 2020.
[25.03.2020] DARWIN Sensitivity to the Neutrinoless Double Beta Decay of 136XeA new study by the DARWIN collaboration shows that the DARWIN observatory, with its 40t liquid xenon target and an ultra-low background will be able to search for the neutrinoless double beta decay of the isotope 136Xe even without expensive isotopic enrichment. Thanks to its rather high natural abundance, the DARWIN target will contain about 3.6t of this isotope. Assuming material contaminations which have been already been identified and intrinsic backgrounds which have to be achieved for the dark matter search, DARWIN will be able to achieve a halflife sensitiviy of 2.4x1027 years after 10 years of operation with a 5t fiducial target. With this sensitivity DARWIN will be able to probe the inverted neutrino mass hierarchy.
Publication: F. Agostini et al. (DARWIN), Sensitivity of the DARWIN observatory to the neutrinoless double beta decay of 136Xe, Eur. Phys. J. C 80, 808 (2020), arXiv:2003.13407.
[01.02.2020] University of Naples joins DARWINWith the University of Naples Federico II, Italy (PI Michele Iacovacci) joining the team in February 2020, the DARWIN collaboration keeps growing.
[08.01.2020] Alabama and l'Aquila groups join DARWINWith the start of the new year, the DARWIN welcomes two new groups joining the effort to built the ultimate xenon-based dark matter detector: the group at the University of Alabama, USA, is led by Igor Ostrovskiy (EXO) and the group at the University of l'Aquila, Italy, is led by Alfredo Ferella (XENON). The two new groups bring valuable experience to the project and increase the total number of institutions in DARWIN to 28.
Welcome Alabama! Welcome l'Aquila!
[10.12.2019] DARWIN Collaboration Meeting @ LNGSMore than 70 scientists from all around the world working on DARWIN gathered at the Italien Laboratori Nazionali del Gran Sasso (LNGS) on December 9-10, 2019, to discuss the status of the project. Two days iwere dedicated to intense discussions and interesting presentations on recent progress on the R&D towards the DARWIN Astroparticle Physics Observatory. We thank LNGS for the hospitality during the meeting.
[31.10.2019] APPEC Community Meeting on Double-Beta DecayThe 40t active liquid xenon target of DARWIN contains about 3.6t of the double-beta decay isotope 136Xe. DARWIN has thus a very good sensitivity to search for the lepton-number violating neutrinoless double-beta decay of this isotope -- without any expensive enrichment. Marc Schumann (Freiburg) presented the latest studies on DARWIN's double-beta sensitivity (slides) at the APPEC Community Meeting on Double-Beta Decay in London (UK), where the common European strategy on this important topic was discussed.
[21.10.2019] DARWIN @ LNGS Scientific Committee MeetingThe DARWIN Collaboration has submitted a Letter of Intent to the Italian Laboratori Nazionali del Gran Sasso (LNGS, Assergi) and was invited to present the project at the 5nd Meeting of the Scientific Committee. The talk was given by Marc Schumann (Freiburg) and can be found here
[13.09.2019] Summer Conferences...DARWIN has been presented at various conferences during the summer.
[14.08.2019] Vinca Institute/University of Belgrade joins DARWINIt is our pleasure to welcome our new collaborators from the Vinca Institute of Nuclear Sciences/University of Belgrade (Serbia) to the DARWIN collaboration. The group brings expertise from experimental particle physics, theoretical nuclear physics, statistical data analysis and computing. Welcome Belgrade!
[16.07.2019] DARWIN @ SNOLAB Future Projects WorkshopWhile the scientific scope of DARWIN is rather well defined, there is not yet a definitive decision which laboratory will eventually host the project. DARWIN got invited to present itself at the Future Projects Workshop of the Canadian SNOLAB in Sudbury (Ontario). The talk given by Darryl Masson (U Freiburg) entitled "DARWIN: More than just the ultimative dark matter detector" can be found here
[14.07.2019] DARWIN @ EPS-HEP 2019The European Physical Society Conference on High Energy Physics (EPS-HEP) is one of the major international conferences that reviews the field. It is organized by the High Energy and Particle Physics Divison of the European Physical Society and the 2019 edition takes place in Ghent, Belgium. The ultimate astroparticle physics observatory DARWIN, its various science channels and the status of the R&D efforts were presented by Kevin Thieme (U Zurich). The slides can be found here.
[04.07.2019] Awards for DARWIN PhD student Yanina BiondiDARWIN PhD student Yanina Biondi (U Zurich) participated in the 57th International Erice School of Subnuclear Physics "In search for the unexpected". She presented a poster about "Xenoscope: Towards DARWIN - the Ultimate Dark Matter Detector" and was awarded the diploma for the best poster. She was a very active participant at the school and was also awarded the Bjorn Wiik diploma for new talents in physics. Congratulations Yanina!
[05.06.2019] DARWIN presented at PATRAS 2019The DARWIN low-background astroparticle physics observatory and its science opportunities were presented by Dr. Luca Scotto Lavina (LPNHE) at the 15th PATRAS Workshop on Axions, WIMPs and WISPs (PATRAS 2019) which was held in Freiburg (Germany) from June 3-7, 2019. The slides of the talk can be found here.
[15.03.2019] DARWIN Input to European Strategy in Particle PhysicsWith its excellent sensitivity to various dark matter candidates (WIMPs, axions, ALPs), neutrinos (solar, supernovae, coherent neutrino nucleus, scattering) and other rate processes (neutrinoless double beta decay of 136Xe, double electron capture of 124Xe, etc.), DARWIN will be an important low-background observatory and a central player in the international particle physics landscape. To stress the importance of the DARWIN science, the collaboration has submitted a document as input to the European Particle Physics Strategy Update 2018-2020.
This document can be found here
[18.12.2018] DARWIN Collaboration Meeting in ZurichAbout 70 members of the ever-growing DARWIN collaboration have met at the University of Zurich (Switzerland) to discuss and coordinate their R&D activities towards the ultimate dark matter experiment. A total of 37 contributions focusing on all relevant aspects for DARWIN were presented.
[24.07.2018] DARWIN presented at IDM 2018The Identification of Dark Matter (IDM) conference series is one of the most important bi-annual meetings of the dark matter community. Its 12th edition in July 2018 was held at Brown University (Providence, USA). The DARWIN project as the ultimate WIMP detector and its rich science program was presented by Fabian Kuger (Freiburg). The slides can be found here.
[18.07.2018] CNO-Neutrinos in DARWINIn a recent paper, DARWIN collaborators Jayden Newstead (ASU) and Rafael Lang (Purdue) show that future xenon experiments with a 200 txy exposure (=DARWIN) will be able to detect the flux of CNO-solar neutrinos at 3 sigma signicicance and will thus provide important insight on the metallicity of the Sun's interior.
The images from the article show that the CNO components of the neutrino flux (blue, left) are hidden below the much more abundant signal from solar pp- and 7Be neutrinos. However, the CNO spectral shape is different and extends up to MeV-scale electronic recoil. The CNO signal is also buried below the background from 2 neutrino double beta decay (ννββ blue, right), which dominates the electronic background in multi-ton-scale LXe dark matter detectors. To measure the CNO-flux, it is thus mandatory to deplete the LXe target from 36Xe by a factor 100 (dashed blue).
[01.07.2018] DARWIN has elected new ManagementIn order to come up with a conceptual design report and a technical design report for the ultimate dark matter observatory DARWIN in the next years, which will be followed by a full proposal to the funding agencies, the DARWIN collaboration has recently established a new management structure and elected the following people for a term of 2 years:
[04.06.2018] DARWIN @ NEUTRINO 2018The DARWIN observatory will not only be the most sensitive detector for dark matter WIMPs with masses above a few GeV, it's ultra-low background from electronic recoils also implies a very good sensitivity for neutrinos. These science channels and the requirement to achieve the low background were discussed in posters by Patricia Sanchez-Lucas (U Zurich) and Guillaume Eurin (MPIK) at the NEUTRINO 2018 conference in Heidelberg. The posters can be found here:
[23.02.2018] DARWIN @ UCLA Dark Matter 2018Manfred Lindner (MPIK Heidelberg) presented the DARWIN project at the Dark Matter Conference which takes place every second year in Los Angeles. He emphasized the challenges of a multi-ton liquid xenon detector, especially in terms of backgrounds, and presented promising solutions. The slides of the talk can be found here.
[09.01.2018] DARWIN on APPEC RoadmapThe Astroparticle Physics European Consortium (APPEC) has published its strategy for the years 2017-2026. The consortium appreciates the goal of an ultimate dark matter detector as proposed by DARWIN and recomments to converge on a strategy for its realization in the next years.
[10.10.2017] Neutrino Physics with DARWINNeutrino physics with DARWIN is the title of an article written by M.L. Benabderrahmane (NYUAD) on behalf of the DARWIN collaboration and which appeared now in the proceedings of the Neutrino 2016 conference.
M.L. Benabderrahmane, Journal of Physics: Conf. Series 888, 012048 (2017).
[15.12.2017] DARWIN @ LAUNCH 2017LAUNCH 2017, a workshop on neutrino, dark matter and beyond the standard model physics was held at the Max Planck Institute of Nuclear Physics in Heidelberg on September 14-15, 2017, celebrating the 60th birthday of DARWIN member Manfred Lindner. Marc Schumann (Freiburg) presented DARWIN at this occasion (slides)
[12.09.2017] DARWIN Meeting in FreiburgMore than 40 members of the DARWIN collaboration did meet in Freiburg (Germany) to discuss the next steps of the project. The two days were dedicated to intense discussions on the structure of the collaboration and how its goal of an ultimate dark matter detector is being pushed forward in the upcoming years.
At this occasion, the collaboration decided to accept three new groups joining DARWIN: the groups of LPNHE, France (Luca Scotto Lavina), LAL, France (Carla Macolino) and of the University of Heidelberg (Stephanie Hansmann-Menzemer et al.).
[01.08.2017] DARWIN at Summer ConferencesThe season of summer conferences has started in May with the DARWIN project being presented at many of the important astroparticle physics and particle physics events.
[28.04.2017] DARWIN endorsed by German particle physics communitiesThe German committees for astroparticle physics (KAT), elementary particle physics (KET) and for hadrons and nuclei (KHuK) organized a meeting in Mainz to discuss their common strategy regarding the Future of non-Collider Physics. The final declaration of the workshop (available in German only, pdf) states that DARWIN, with its broad scientific program on neutrinos, should be realized if the future direct detection results are promising.
[18.03.2017] Two ERC grants will boost R&D for DARWIN
Two members of the DARWIN consortium were awarded prestigious ERC grant from the European Research Council.
Marc Schumann (Freiburg) was awarded an ERC Consolidator Grant for his project ULTIMATE in November, and Laura Baudis (Zurich) received an ERC Advanced for her project Xenoscope in March. ULTIMATE will start in May 2017 and Xenoscope in October. Both projects aim at preparing for the conceptual design of DARWIN, by conducting ambitious R&D to solve various technical challenges.
[15.02.2017] Article on DARWIN in CERN courier
The article Testing WIMPs to the limit authored by the DARWIN project coordinator Laura Baudis was published in the CERN Courier. It describes how the multi-ton liquid xenon observatory DARWIN could be realized at the Italian Gran Sasso Laboratory (LNGS) by the mid-2020s and the plethora of science topics in particle and astroparticle physics it can explore.
The image illustrates the baseline design of the DARWIN time projection chamber, with two arrays of photomultipliers installed above and below the sensitive liquid xenon target.
[10.11.2016] DARWIN Science Paper published
The scientific article describing the DARWIN facility, its WIMP and non-WIMP science channels, backgrounds and the current status of R&D towards its realitation has now been publcished in the Journal of Cosmology and Astroparticle Physics: DARWIN Collaboration, JCAP 11, 017 (2016), arXiv:1606.07001.
[01.11.2016] DARWIN Bern group moves to Freiburg
The DARWIN group of Marc Schumann is moving from the University of Bern (Switzerland) to the University of Freiburg (Germany). The group plans to extend its DARWIN acitivities at the new institution.
[20.09.2016] DARWIN @ TeVPA 2016
Two dedicated talks presented the science opportunities of DARWIN at the TeV Particle Astrophysics Conference (TeVPA), which was held at CERN this year. Alexander Kish (U Zurich, slides) introduced the DARWIN project and described its sensitivity to WIMPs, and also summarized the plethora of new science channels which open up with a multi-ton liquid xenon detector. Shayne Reichard (Purdue, slides) focused on the possibility to detect supernova neutrinos, as studied in a recent publication.
[21.07.2016] DARWIN @ IDM 2016
The bi-annual IDM conference on the Identification of Dark Matter is one of the largest conferences focussing almost entirely on dark matter, with experimental direct detection covering a large fraction of the agenda. The 2016 edition of the event took place in Sheffield and Auke Pieter Colijn (NIKHEF/U Amsterdam) has presented the science case for DARWIN and the path towards the ultimate dark matter detector. The slides are available here.
[08.07.2016] DARWIN at summer conferences
The DARWIN project has been presented at two summer conferences: Luca Scotto Lavina (Subatech) discussed the project and its science opportunities (slides here) at the Dark Matter 2016 conference in Santander (Spain). The poster presentation of Lotfi Benabderrahmane (NYUAD) at NEUTRINO 2016 in London focused on the new possibilities for neutrino physics which will open up in DARWIN.
[01.07.2016] Supernova detection in DARWIN
A new study on the possibility to detect neutrinos emitted in supernova explosions in large-scale liquid xenon TPCs has been published online at arXiv:1606.09243, led by DARWIN members from Purdue and Bologna. The detection process in liquid xenon detectors such as DARWIN is via Z-boson mediated elastic coherent neutrino-nucleus scattering (CNNS). This complements "conventional" detectors for supernova neutrinos, as this process is sensitive to all three neutrino flavors and their anti-particles and therefore allows for the reconstruction of the neutrino-light curve without uncertainties from neutrino oscillation as well as the measurement of the total energy emitted in neutrinos.
The Figure from the publication shows the expected neutrino rate observed the 40 t liquid xenon target of DARWIN during the first second after the explosion of a supernova of 27 solar masses at a distance of 10 kpc. Thanks to its large target, low background and low energy threshold, DARWIN will observe about 300 neutrinos in the first second, which will allow to trace the emission rate during the supernova neutronization and accretion phases.
[23.06.2016] DARWIN collaboration publishes DARWIN science paper
Today, the DARWIN collaboration has published a detailed article on DARWIN, its science channels, its background and on the R&D towards its realization. The study, signed by 119 authors can be found here: arXiv:1606.07001.
With a design target mass of 40 tons of liquid xenon, DARWIN will be able to search for
The Figure is from the publication and shows the sensitivity of DARWIN to the effective Majorana neutrino mass via a search for the neutrinoless double-beta decay of 136Xe. Two different exposures (30 t x y and 140 t x y) at two different background levels are shown. The 'ultimate' case assumes that background from the detector materials can be removed completely, thus the remaining backgrounds are from 222Rn in the Xe target, 8B solar neutrinos and the two-neutrino double beta decay.
[22.06.2016] DARWIN at PATRAS 2016
DArk matter search WIth liquid xenonN (DARWIN) has been presented at the 12th PATRAS Workshop on Axions, Wimps and Wisps which took place on the island of Jeju (South Korea). Moritz von Sivers (Bern) presented the project and its many search channels.
[09.03.2016] Experimental group from RPI joins DARWIN
The group of Ethan Brown at the Rensselaer Polynechnic Institute, RPI (Troy, USA) has joined DARWIN. It will strenghen our R&D efforts in terms of the handling and purification of a large-mass gas target.
[19.02.2016] DARWIN presented at UCLA Dark Matter 2016
The DARWIN project, its science goals in terms of dark matter and other astroparticle physics channels, and some recent R&D projects have been presented by the DARWIN project coordinator Laura Baudis at the ULCA Dark Matter Conference, which takes place in Los Angeles (USA) every second year. The presentation can be found here.
[30.01.2016] DARWIN Consortium is growing again
We are happy to welcome three new experimental research groups to the DARWIN consortium. The groups from University of California at San Diego (Kaixuan Ni), the University of Chicago (Luca Grandi) and the New York University at Abu Dhabi (Francesco Arneodo) bring in a broad expertise in experimental rare event searches with noble liquids.
[25.11.2015] Inauguation of new graduate school in Münster
The DARWIN colleagues from the University of Münster (group from Christian Weinheimer) inaugurated their new DFG-funded reasearch training group Strong and Weak Interactions - from Hadrons to Dark Matter with a retreat in Telgte (DE) from November 24-26, 2015. The science case for DARWIN -- WIMPs and various other rare processes -- was presented at this occasion.
[10.11.2015] Progress towards new readout schemes for TPCs
The DARWIN group at the Weizmann Institute of Science (Amos Breskin) has recently published two studies in the Journal of Instrumentation (KINST), demonstrating interesting new approaches for the readout of large-scale LXe TPCs. The first publication describes the first results of a large-area cryogenic gaseous photomultiplier (GPM) coupled to a dual-phase LXe TPC, which might be used to realize a TPC with a 4pi readout. The second article reports on the diect observation of gas bubble-assisted electroluminiscence in LXe; a potential way to realize a single-phase detector with "local dual-phase" amplification.
The Figure shows light (S1) and charge (S2) signal from a dual-phase TPC, recoded with a PMT and a GPM. The latter was operated at a gain of 1x105 and the signal is shaped using a timing filter amplifier.
[10.09.2015] The science case of DARWIN at TAUP 2015
The scientific opportunities which open up with a multi ton-scale liquid xenon detector such as DARIN were presented by Marc Schumann (Bern) at the 14th Internatonal Conference on Topics in Astroparticle and Underground Physics (TAUP 2015), which took place in Torino. The talk, which emphasized that the neutrino-floor is accessible with DARWIN, is available here.
[31.07.2015] Cosmogenic activation of Xenon
Intrinsic backgrounds, the ones which cannot be reduced by target fiducialization, are most critical for large-scale dark matter detectors. The question whether the activation of the xenon gas by cosmic rays can lead to problematic backgrounds was investigated in a dedicated study by DARWIN members (arXiv:1507.03792). Several cosmogenic isotopes were identified in a xenon sample which has been activated for one year at an altitude of 3470 m, however, only one of the isotopes (125Sb) can potentially lead to a background for the dark matter search. An ultra-pure sample of copper was exposed to cosmic rays together with the xenon in order to provide a benchmark and to test commonly used codes to calculate the activation.
[24.07.2015] DARWIN presented at EPS HEP 2015 in ViennaAlfredo D. Ferella (Stockholm) has presented the DARWIN observatory and its science channels at the high energy physics conference of the European Physical Society (EPS HEP 2015), one of the largest topical events in the field, which was held in Vienna this year. The slides can be found here.
[30.06.2015] The WIMP sensitivity of a multi-ton scale LXe detector
DARWIN members from Bern, Zurich and Bologna have studied the WIMP dark matter reach of a DARWIN-like multi-ton LXe detector. Taking into account all backgrounds, including the one from solar pp-neutrinos, the DARWIN sensitivity was studied vs. exposure, background rejection, energy threshold as well as energy scale. The authors conclude that spin-independent cross sections as low as 2.5 x 10-49 cm2 for WIMP masses around 40 GeV/c2 can be probed with an exposure of 200 t x y. In addition, DARWIN will also have an excellent sensitivity to spin-dependent couplings (in particular when WIMPs couple to neutrons) as well as to inelastic processes. (Read more: arXiv:1506.08309).
The Figures show the sensitivity of DARWIN for two different exposures of 200 t x y (black, with 1 and 2σ bands) and 500 t x y. The left plots shows spin-independent couplings, the right plot spin-dependent couplings to neutrons. The DARWIN sensitivity is compared to already achieved results by XENON100 and LUX, plus the expected sensitivities of upcoming experiments.
[13.06.2015] LXe-based Dark Matter Searches beyond XENON
A talk on the multi-ton stage of the XENON experiment and how to go beyond to the DARWIN scale has been presented at WIN 2015 in Heidelberg by Hardy Simgen (MPIK), with a special emphasis on the various technical challenges which will arise. The talk can be found here.
[28.04.2015] The future of multi-ton LXe and LAr detectors presented at LNGS
Coordinator Laura Baudis has presented the DARWIN project at a 1-day workshop on the future of LNGS in Assergi, Italy. In the DARWIN presentation she made the case that a multi-ton scale dual phase TPC filled with liquid xenon is ideally suited to search for WIMP dark matter for all masses above about 7 GeV/c2, probing spin-independent, spin-dependent as well as inelastic channels, with an appealing complementarity to dark matter searches at colliders. Due to its extremely low background, DARWIN-LXe will be sensitive to various other science channels as well, such as low energy solar neutrinos, axions and axion-like particles, supernova neutrinos, double beta decays, etc.
At the same meeting, the argon groups presented their independent program for the LAr future: following a 20t stage of DarkSide, they propose to build Argo, a LAr detector of 300t mass. Due to the excellent background reduction based on pulse-shape discrimination, such a detector would not only search for WIMP dark matter at masses of 1000 GeV/c2 and above, but would also be able to measure 7Be, pep, and CNO neutrinos with high precision, exploiting the energy region above the 39Ar background.
As a consequence, the LXe and LAr communities decided to independently work towards two very large-scale detectors, DARWIN (LXe) and Argo (LAr)
[09.01.2015] DARWIN meeting at the Weizmann Institute of Science
More than 35 members of the DARWIN consortium have gathered at the Weizmann Institute of Science in Rehovot (IL) to discuss the status and the future of the project.
[15.10.2014] DARWIN received A-rating on Swiss Roadmap
Switzerland is putting together a new roadmap for large infrastructures of national importance. The Swiss DARWIN groups have submitted a proposal to get onto this roadmap. It has been evaluated and has received the highest possible ranking, "A: considerable importance", and a clear statement that it should be included in the roadmap.
[24.07.2014] Change of the DARWIN URL: We can now be found even easier!
As of July 24, 2014, finding the DARWIN pages in the web is even easier than before. The new address is darwin-observatory.org. Of course the old URL at the University of Zürich remains valid as well.
[12.06.2014] DARWIN presented at SWAPS 2014
The project coordinator of DARWIN, Laura Baudis (UZH), presented the status of the project at the SWAPS 2014 workshop in Cartigny, close to Geneva (Switzerland). The main topics of the meeting were astroparticle and neutrino physics, and the DARWIN slides can be found online.
[12.05.2014] Review on future noble gas experiments covering DARWIN
DARWIN was presented as the ultimate WIMP detector in a review talk on future noble gas experiments. The presentation was given by Patrick Decowski (Nikhef/Amsterdam) at the Latest Results in Dark Matter Searches workshop in Stockholm (Sweden).
[28.02.2014] DARWIN presented at UCLA Dark Matter 2014 in Los Angeles
The DARWIN project was presented by Giuliana Fiorillo (Napoli) at the UCLA Dark Matter 2014 conference, which takes place every second year in Los Angeles (USA). Aiming for the ultimate WIMP detector, the DARWIN talk (slides) was presented in the session covering new very large detectors.
[19.12.2013] General DARWIN meeting in Naples
The 5th general meeting of the DARWIN consortium took place from December 9-11, 2013, at the University of Naples (Italy). More that 25 members attended the presentations on recent developments to improve low-background noble-liquid TPCs, the science reach of DARWIN-type detectors, and to discuss the future of DARWIN beyond the ASPERA-funded initial period.
[29.09.2013] Neutrino Physics with a DARWIN-type Detector
Members of the DARWIN collaboration, from the University of Zurich, University of Bern, and the MPI für Kernphysik, have shown in a recent publication (arXiv:1309.7024) that a DARWIN-type dark matter detector, filled with about 20 tons of liquid xenon and operated as a dual phase TPC, can not only detect WIMP dark matter with a sensitivity down to spin-independent cross sections of a few 10-49 cm2, but that it can also be used to do neutrino physics.
Using a detailed Monte Carlo simulations, and realistic assumptions on background levels and thresholds, they could show that a first real-time measurement of the flux of solar pp-neutrinos is feasible to a precision of ~1% in a 5 years measurement. Other new neutrino physics channels are the neutrinoless double beta-decay of Xe-136, where competitive sensitivities can be reached even without isotopic enrichment, and coherent neutrino-nucleus scattering.
[13.06.2013] The scientific reach of ton-scale experiments
In a new article, arXiv:1306.3244 and PRD 88, 076011 (2013), the DARWIN members of Arizona study the scientific dark matter reach of ton-scale dark matter detectors, such as DARWIN. In their numerical study, they incorporate realistic detector physics, particle physics and astrophysical uncertainties and demonstrate to what extent two targets, senon and argon, with similar sensitivities can remove various degeneracies and allow a determination of dark matter cross sections and masses while also probing rough aspects of the dark matter phase space distribution.
[03.05.2013] The DARWIN consortium is growing again
The development of a multi-ton scale dark matter facility is an important goal in the Astroparticle Physics Community and is attracting more and more scientists. As of 01.05.2013, two new groups have joined the DARWIN consortium: an independent group from the University of Zurich (Ben Kilminster) and one from the University of Stockholm (Jan Conrad).
[12.12.2012] Article on DARWIN on the Aspera website
A popular science article featuring DARWIN has been published on the Aspera website. It summarizes the challenges in direct dark matter detection and for DARWIN, based on an interview with the DARWIN project coordinator Laura Baudis (Zurich).
[02.12.2012] Three new groups joining DARWIN
The DARWIN consortium is growing again. Three new groups are joining the international effort to build a multi-ton dark matter detector using a liquid noble gas target. The groups from Imperial College London, UK (Roberto Trotta) and of Purdue University, USA (Rafael Lang) are joining as of December 2012, the group from Bern, Switzerland (Marc Schumann) will start in January 2013.
[25.09.2012] Fourth general Meeting of the DARWIN Consortium in Mainz
On September 13/14, 2012, more than 30 members of the DARWIN consortium representing the xenon and the argon side of the project met for their annual meeting at the Johannes Gutenberg Universität in Mainz, Germany. It was a opportunity to discuss the status of the project, to present recent research highlights, and to meet new collaborators.
[10.08.2012] 4th DARWIN Meeting in Mainz
The 4th general meeting of the DARWIN consortium will take place in Mainz September 13/14, 2012. More information on the meeting and registration details for members can be found here.
[21.07.2012] DARWIN was presented at the 8th Patras Workshop on Axions, WIMPs and WISPs held at Chicago
The Patras workshop series continues to attract the key players in the field of direct dark matter detection to gather in a nice and personal atmosphere to discuss recent results and the progress achieved so far. DARWIN was presented in a combined talk with XENON1T, the slides can be found here.
[06.03.2012] Article on GridPix published
A conference proceedings article on the development of GridPix detectors for dark matter searches with noble liquids such as DARWIN has been published in IEEE NS. The Nikhef group working at this subject aims to improve the charge measurement in double phase time projection chambers.
[28.02.2012] DARWIN was presented at UCLA Dark Matter Conference
Every second year in February, experimentalists and theorists gather at the UCLA Dark Matter conference organized by the University of California at Los Angeles (UCLA) to discuss the progress of the field. DARWIN was presented at this meeting, the slides can be found here.
[01.02.2012] TAUP Proceeings paper on DARWIN online
The status of the DARWIN project and highlighs of recent progress was presented at the TAUP 2011 conference in Munich. The proceedings paper of this conference is now available online.
[11.01.2012] TU Dresden joins DARWIN
The DARWIN consortium is growing once more. The group of Kai Zuber at TU Dresden (Germany) is joining DARWIN with the start of the year 2012.
[29.11.2011] New Proceedings Paper on DARWIN online
An article to appear in the Proceedings of the 7th Patras workshop on Axions, WIMPs and WISPs is available online now. It gives an overview on the project and on the current status of the R&D activities within the consortium.
[18.10.2011] Arizona State University joins DARWIN
We are pleased to announce that our working group "Scientific Impact" is getting stronger as the cosmology group of Arizona State University (Lawrence Krauss) is joining the DARWIN consortium.
[20.09.2011] Third general DARWIN meeting in Amsterdam
On September 15 and 16, 2011, the third face-to-face meeting of the DARWIN consortium was held at Nikhef in Amsterdam. Many members were attending and presented their research progress on the various topics covered in DARWIN.
[08.09.2011] Talk on DARWIN at TAUP 2011
The bi-annual meeting on Topics in Astroparticle and Underground Physics (TAUP) is one of the most iimportant and biggest meeting for Dark Matter Searches. It's 12th edition was held September 5-9 in Munich, Germany.
DARWIN has been presented at this meeting, the presentation can be found here.
[01.08.2011] Information regarding the 3rd DARWIN Meeting
As announced previously, the third general meeting of the DARWIN consortium will take place at Nikhef in Amsterdam on September 15 and 16, 2011. Information regarding accomodation and transportation can be found in the DARWIN wiki.
[01.07.2011] DARWIN presented at PATRAS11
The DARWIN project has been presented at the 7th Patras Workshop on Axions, WIMPs and WISPs which was taking place end of June on the Greek island Mykonos.
[01.06.2011] DARWIN consortium is growing
We are happy to announce that new groups have recently joined the DARWIN consortium:
[02.05.2011] Announcement of the 3rd DARWIN Meeting
The third general meeting of the DARWIN consortium will take place in Amsterdam on September 15 and 16, 2011.
[22.12.2010] Conference Proceedings Article on DARWIN online
The first conference proceedings article on the DARWIN project, based on a presentation given at IDM2010 in Montpellier, France, is now online:
[22.10.2010] ASPERA Technology Forum, Munich
The DARWIN project and its technical requirements were presented at the ASPERA Technology Forum on Photosensors and auxiliary electronics in Munich, Germany.
[15.09.2010] Second general DARWIN meeting in Zurich
The second meeting of the DARWIN consortium was held on Sept 14-15 at the University Zurich. About 30 scientists came together to report on the progress that has been achieved in the time since the last meeting.
[02.08.2010] Announcement of the second DARWIN meeting in Zurich
The second general meeting of the DARWIN consortium will take place at the University of Zurich on September 14-15 2010.
[30.07.2010] DARWIN was presented at several international conferences
Since the first meeting, the DARWIN project and the consortium were presented at several international conferences and workshops in Europe and the United States. The talks of Laura Baudis (DARWIN project coordinator) can be found online:
[26.01.2010] First DARWIN meeting
The first face-to-face meeting of the full DARWIN consortium was held at the Physik Institut of the University of Zürich on January 25-26, 2010.
[30.10.2009] DARWIN approved by the ASPERA network
We are happy to announce that the DARWIN proposal got approval by the ASPERA network, and that the DARWIN groups from Italy, France, the Netherlands, and Switzerland will be funded to work on this project at a total cost of 633 kEuro.
[04.06.2009] DARWIN proposal submitted
The proposal of the DARWIN (Dark Matter Wimp Search With Noble Liquids) collaboration has been submitted to the ASPERA network.
:: modified 20.07.2021 ::