C. Amsler Physik-Institut der Universität Zürich

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Polyethylene NaI(Tl) 370 MBq Am-Be 241 Am (T1/2 = 430 a) WIN’11, CapeTown, 31 January 2011, C. <strong>Amsler</strong> Neutron background Neutrons e.g. from the rocks (spallation from cosmic rays) can simulate WIMPs! s(n A) ~ 10 18 s(WIMP-A) !! Neutrons 40 n/s Cooling LAr Reflector/WLS Pure LAr 210 Pb source •Neutron energy up to 10 MeV •4.4 MeV g (coincidence) 0 6 12 MeV PMT 74 x 78 mm 2 Hamamatsu R6091-01 mod J. Marsh et al., NIM A 366 (1995) 340 24
Component Ratio = fast (
Page 1 and 2: Search for WIMPs in liquid argon C.
Page 3 and 4: • Fritz Zwicky (1933) from the mo
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 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
Page 35 and 36: WIN’11, CapeTown, 31 January 2011

C. Amsler Physik-Institut der Universität Zürich

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