Double beta decay of⁴⁸Ca studied by CaF₂(Eu) scintillators

Saori Umehara, T Kishimoto,Isamu Ogawa,R Hazama,Hiroshi Miyawaki,Shoji Yoshida,Katsuyoshi Matsuoka,Koji Kishimoto,Asuka Katsuki,Hiroyuki Sakai,Daisuke Yokoyama,Kenichi Mukaida,S Tomii,Y Tatewaki,T Kobayashi,Akio Yanagisawa

Journal of Physics Conference Series（2008）

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摘要

We report the new limit on the half-life of neutrino-less double beta decay(0 nu beta beta) of Ca-48. In order to achieve the background free measurement, measurement of pulse shape was essential. We have observed no event in the Q(beta beta)-value region. We set the new limit on 0 nu beta beta half-life as T-1/2(0 nu beta beta) > 4.0 x 10(22) year.

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Double beta decay of48Ca studied by CaF2(Eu) scintillators

Double beta decay of⁴⁸Ca studied by CaF₂(Eu) scintillators