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Limits on single and double Majoron emission processes in neutrinoless double β decay of Mo 100

1993; American Physical Society; Volume: 48; Issue: 11 Linguagem: Inglês

10.1103/physrevd.48.5412

1538-4500

Junji Tanaka, H. Ejiri,

Muon and positron interactions and applications

The single Majoron emission mode ($\ensuremath{\beta}\ensuremath{\beta}B$) and the double Majoron emission mode ($\ensuremath{\beta}\ensuremath{\beta}\mathrm{BB}$) in the neutrinoless double $\ensuremath{\beta}$ decays of $^{100}\mathrm{Mo}$ were studied by using the ultralow background nuclear spectrometer ELEGANTS V. Lower limits on the half-lives were deduced as ${T}_{\frac{1}{2}}^{\ensuremath{\beta}\ensuremath{\beta}B}>7.9\ifmmode\times\else\texttimes\fi{}{10}^{20}$ yr and ${T}_{\frac{1}{2}}^{\ensuremath{\beta}\ensuremath{\beta}\mathrm{BB}}>5.3\ifmmode\times\else\texttimes\fi{}{10}^{19}$ yr (68% C.L.), respectively. They set the upper limit of $|〈{g}_{B}〉|<2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ on the Majoron coupling constant, and the lower limit of ${M}_{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{Z}}>0.038$ GeV on the Majorana mass of the $Z$-ino.