1. Simultaneous Measurement of Half-Life and Spectral Shape of $^{115}$In $\beta$-decay with an Indium Iodide Cryogenic Calorimeter
- Author
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Pagnanini, L., Benato, G., Carniti, P., Celi, E., Chiesa, D., Corbett, J., Dafinei, I., Di Domizio, S., Di Stefano, P., Ghislandi, S., Gotti, C., Helis, D. L., Knobel, R., Kostensalo, J., Kotila, J., Nagorny, S., Pessina, G., Pirro, S., Pozzi, S., Puiu, A., Quitadamo, S., Sisti, M., Suhonen, J., and Kuznetsov, S.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
Current bounds on neutrino Majorana mass are affected by significant uncertainties in the nuclear calculations for neutrinoless double-beta decay. A key issue for a data-driven improvement of the nuclear theory is the actual value of the axial coupling constant $g_A$, which can be investigated through forbidden $\beta$-decays. We present the first measurement of 4$^{th}$-forbidden $\beta$-decay of $^{115}$In with a cryogenic calorimeter based on Indium Iodide. Exploiting the enhanced spectral shape method for the first time to this isotope, our study accurately determines simultaneously spectral shape, $g_A$, and half-life. The Interacting Shell Model, which best fits our data, indicates a half-life for this decay at $T_{1/2}=(5.26\pm0.06) \times 10^{14}$,yr.
- Published
- 2024