Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground Laboratory
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摘要
We report results of a search for light weakly interacting massive particle(WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory(CJPL). Constraints on WIMP-nucleon spin-independent(SI) and spin-dependent(SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV.
We report results of a search for light weakly interacting massive particle(WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory(CJPL). Constraints on WIMP-nucleon spin-independent(SI) and spin-dependent(SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV.
We report results of a search for light weakly interacting massive particle(WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory(CJPL). Constraints on WIMP-nucleon spin-independent(SI) and spin-dependent(SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV.
引文
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2 C.Kelso,D.Hooper,and M.R.Buckley,Phys.Rev.D,85:043515(2012)and references therein
3 P.S.Barbeau et al,J.Cosmol.Astropart.Phys.,09:009(2007)
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7 K.J.Kang et al,Front.Phys.,8:412(2013)
8 Y.C.Wu et al,J.Tsinghua Univ.(Sci.&Technol.),53:1365(2013)
9 J.L.Ma et al,Applied Radiation and Isotopes,127:130-136(2017)
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12 Y.C.Wu et al,Chin.Phys.C,37:086001(2013)
13 Z.M.Zeng,Research and Application of Low Background Thermal Neutron Detection Technology,Ph.D.thesis,Tsinghua University(2017)
14 Geant4,http://geant4.web.cern.ch/geant4/
15 C.Savage,G.Gelmini,P.Gondolo,and K.Freese,J.Cosmol.Astropart.Phys.,04:010(2009)
16 J.F.Ziegler,Nucl.Instrum.Methods Phys.Res.Sect.B,219:1027-1036(2004);S.T.Lin et al(TEXONO Collaboration),Phys.Rev.D,79:061101(2009)
17 F.Donato,N.Fornengo,and S.Scopel,Astropart.Phys.,9:247(1998)
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19 C.E.Aalseth et al,Phys.Rev.D,88:012002(2013)
20 P.Belli et al,Phys.Rev.D,84:055014(2011)
21 R.Agnese et al,Phys.Rev.Lett.,111:251301(2013)
22 E.Aprile et al(XENON Collaboration),Phys.Rev.Lett.,119:181301(2017)
23 D.S.Akerib et al(LUX Collaboration),Phys.Rev.Lett.118:021303(2017)
24 X.Y.Cui et al(PandaX-II Collaboration),Phys.Rev.Lett.,119:181302(2017)
25 R.Agnese et al(SuperCDMS Collaboration),Phys.Rev.Lett.,116:071301(2016)
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28 S.K.Liu et al(CDEX Collaboration),Phys.Rev.D,90:032003(2014)
29 J.Billard et al,Phys.Rev.D,89:023524(2014)