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arxiv: 0810.4746 · v1 · submitted 2008-10-27 · ⚛️ nucl-ex

Neutrino-less Double Beta Decay of 48Ca studied by CaF2(Eu) Scintillators

S.Umehara , T.Kishimoto , I.Ogawa , R.Hazama , H.Miyawaki , S.Yoshida , K.Matsuoka , K.Kishimoto
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A.Katsuki H.Sakai D.Yokoyama K.Mukaida S.Tomii Y.Tatewaki T.Kobayashi A.Yanagisawa
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keywords betacaf2datadaysdecaydoublelimitneutrino-less
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We searched for the neutrino-less double beta decay(0nbb) of 48Ca by using CaF2(Eu) scintillators. Analysis of their pulse shapes was effective to reduce backgrounds. No events are observed in the Q-value region for the data of 3394 kg days. It gives a lower limit (90% confidence level) of T > 2.7 x 10^22 year for the half life of 0nbb of 48Ca. Combined with our previous data for 1553 kg days, we obtained more stringent limit of T > 5.8 x 10^22 year.

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    Ab initio IM-NCCI calculations on 48Ca establish strong linear correlations between 0νββ and 2νββ NMEs across 34 chiral Hamiltonians, yielding a constrained M^{0ν} prediction of 1.30-1.65 after incorporating experimen...