C. Amsler Physik-Institut der Universität Zürich

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WIN’11, CapeTown, 31 January 2011, C. Amsler Abstract: The DARWIN Collaboration has been funded by ASPERA to prepare a proposal for a next generation of WIMP searches using noble liquids. The University of Zurich is performing R&D to detect the VUV light from recoiling nuclei. I will present results obtained with 1 ton of liquid argon (ArDM project) and discuss the response to neutrons using a monochromatic neutron source. Progress report on some of the developments at CERN towards the construction a large liquid argon (LAr) detector for dark matter searches. Liquid argon technology for dark matter searches is still in its infancy 1) Brief review on dark matter 2) Future project, DARWIN consortium 3) R&D on light readout in liquid argon 4) First results from 1 ton LAr (ArDM) 5) Response LAr to neutrons 6) Conclusions C. Amsler et al. (ArDM Coll.) JINST 5 (2010) P11003 (and ref. therein) V. Boccone, PhD thesis, Univ. Zurich, 2010 2
• Fritz Zwicky (1933) from the movements of galaxies in clusters using the virial theorem: Ttotal much too large • Vera Rubin (1970) from the speed of stars in spiral galaxies Andromeda Astrophysical evidences for dark matter v 1/r 1/2 Milky Way 5 x more dark matter than ordinary matter • Most impressive: Collision of galaxies in the Bullet Cluster (1E0657-558) X-ray emission from baryonic matter slowing down (electromagnetic repulsion) Center of mass from gravitational lensing WIN’11, CapeTown, 31 January 2011, C. Amsler 3 r © 1994 Deneba Systems, Inc.
Page 1: Search for WIMPs in liquid argon C.
Page 5 and 6: Most popular: WIN’11, CapeTown, 3
Page 8 and 9: Future laboratory searches: coordin
Page 10 and 11: Rate/day in a 1 ton liquid Ar detec
Page 12 and 13: Ar2* argon excimers 1S (t1 = 5ns),
Page 14 and 15: Light yield depends strongly on arg
Page 16 and 17: Recoil nuclei (WIMPs, n) populate t
Page 18 and 19: Large scale evaporator UV illuminat
Page 20 and 21: WLS on PMT (direct light detection)
Page 22 and 23: WIN’11, CapeTown, 31 January 2011
Page 24 and 25: Polyethylene NaI(Tl) 370 MBq Am-Be
Page 27 and 28: NSD fusion source (60’000 €) Sh
Page 29 and 30: Energy calibrations 1) of neutron c
Page 31 and 32: TOF-> Tn Recoil spectrum from gener
Page 33 and 34: Essential to go below 30 keV: WIN
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C. Amsler Physik-Institut der Universität Zürich

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