New limits on spin-independent and spin-dependent couplings of low-mass WIMP dark matter with a germanium detector at a threshold of 220 eV

Lin, S.; Li, H.; Li, X.; Lin, S.; Wong, H.; Deniz, M.; Fang, B.; He, D.; Li, J.; Lin, C.; Lin, F.; Ruan, X.; Singh, V.; Soma, A.; Wang, J.; Wang, Y.; Wu, S.; Yue, Q.; Zhou, Z.

doi:10.1103/physrevd.79.061101

New limits on spin-independent and spin-dependent couplings of low-mass WIMP dark matter with a germanium detector at a threshold of 220 eV

Atıf İçin Kopyala

Lin S. T., Li H. B., Li X., Lin S. K., Wong H. T., Deniz M., ...Daha Fazla

PHYSICAL REVIEW D, cilt.79, sa.6, 2009 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 79 Sayı: 6
Basım Tarihi: 2009
Doi Numarası: 10.1103/physrevd.79.061101
Dergi Adı: PHYSICAL REVIEW D
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

An energy threshold of (220 +/- 10) eV was achieved at an efficiency of 50% with a four-channel ultralow-energy germanium detector, each with an active mass of 5 g. This provides a unique probe to weakly interacting massive particles (WIMP) dark matter with mass below 10 GeV. With a data acquisition live time of 0.338 kg-day at the Kuo-Sheng Laboratory, constraints on WIMPs in the galactic halo were derived. The limits improve over previous results on both spin-independent WIMP-nucleon and spin-dependent WIMP-neutron cross-sections for WIMP mass between 3 and 6 GeV. Sensitivities for full-scale experiments are projected. This detector technique makes the unexplored sub-keV energy window accessible for new neutrino and dark matter experiments.