Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Limits on Low-Mass WIMP Dark Matter with an Ultra-Low-Energy Germanium Detector at 220 eV Threshold

Jul 16, 2009, 9:45 AM
Middle Lecture Hall B (Kraków, Poland)

Middle Lecture Hall B

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Astroparticle Physics I. Astroparticle Physics


Dr Muhammed Deniz (Instructor)


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)

Presentation materials