First Results from Dark Matter Search Experiment in the Nokogiriyama Underground Cell

Details First Results from Dark Matter Search Experiment in the Nokogiriyama Underground Cell First Results from Dark Matter Search Experiment in the Nokogiriyama Underground Cell

1999-04-30

arxiv.org/abs/hep-ex/9904034v1

Phys.Lett.B461:371-375,1999

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, Revtex, 4 figures

Scientific paper

10.1016/S0370-2693(99)00889-8

An experiment to search for hypothetical particle dark matter using cryogenic thermal detector, or bolometer is ongoing. The bolometer consists of eight pieces of 21 g LiF absorbers and sensitive NTD germanium thermistors attached to them and is installed in the Nokogiriyama underground cell which is a shallow depth site ($\sim 15$ m w.e.). We report on the results from the first running for about ten days using this arrayed bolometer system together with appropriate shieldings and muon veto counters. From the obtained energy spectra the exclusion limits for the cross section of the elastic neutralino-proton scattering are derived under commonly accepted astrophysical assumptions. The sensitivity for the light neutralino with a mass below 5 GeV is improved by this work.

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