Ultra low energy results and their impact to dark matter and low energy neutrino physics

Details Ultra low energy results and their impact to dark matter and low energy neutrino physics Ultra low energy results and their impact to dark matter and low energy neutrino physics

2010-10-20

arxiv.org/abs/1010.4132v1

Physics

Instrumentation and Detectors

14 pages,16 figures

Scientific paper

We present ultra low energy results taken with the novel Spherical Proportional Counter. The energy threshold has been pushed down to about 25 eV and single electrons are clearly collected and detected. To reach such performance low energy calibration systems have been successfully developed: - A pulsed UV lamp extracting photoelectrons from the inner surface of the detector - Various radioactive sources allowing low energy peaks through fluorescence processes. The bench mark result is the observation of a well resolved peak at 270 eV due to carbon fluorescence which is unique performance for such large-massive detector. It opens a new window in dark matter and low energy neutrino search and may allow detection of neutrinos from a nuclear reactor or from supernova via neutrino-nucleus elastic scattering

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