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In searches for rare phenomena such as elastic scattering of dark matter particles or neutrinoless double beta decay, alpha decays of 222 Rn progenies attached to the surfaces of the detection material have been identified as a serious source of background. In measurements with CsI (Tℓ) scintillator crystals, we demonstrate that alpha decays of surface contaminants produce fast signals with...
The search for neutrinoless double beta decay (0νββ) is a key experiment for evaluating the mass of the neutrino and for determining the Majorana/Dirac nature of neutrinos. A scintillating CaMoO 4 crystal is a good material for use in investigating 0νββ with cryogenic detectors. The high transition energy (Q=3034keV) and nearly 10% natural abundance of 100 Mo, together with the scintillating...
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