Speaker
Dr
Muhammed Deniz
(Instructor)
Description
An energy threshold of (220+-10) eV was achieved at an efficiency of 50% with a four-channel ultra-low-energy germanium detector [1] with a total active mass of 20 g. This provides a unique probe to WIMP dark matter with mass below 10 GeV. With low background data taken at the Kuo-Sheng Laboratory, limits on WIMPs in the galactic halo were derived for both spin-independent and spin-independent couplings down to WIMP mass of 3 GeV [2]. This detector technique makes the unexplored sub-keV energy window accessible for new neutrino and dark matter experiments [1]. Status on data taking and analysis on a 500-g point-contact germanium detector will be reported.
References:
1.H.T. Wong, Mod. Phys. Lett. A 23, 1431 (2008).
2.S.T. Lin et al., Phys. Rev. D 76, 061101(R) (2009) .
Primary authors
Prof.
Henry Tsz King Wong
(Institute of Physics, Academia Sinica)
Dr
Shin-Ted Lin
(Institute of Physics, Academia Sinica)
