학술논문
Simultaneous Measurement of Half-Life and Spectral Shape of $^{115}$In $\beta$-decay with an Indium Iodide Cryogenic Calorimeter
Document Type
Working Paper
Author
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.; Kuznetsov, S.
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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.