Simultaneous Measurement of Half-Life and Spectral Shape of $^{115}$In $\beta$-decay with an Indium Iodide Cryogenic Calorimeter

Author:

L. Pagnanini, G. Benato, P. Carniti, E. Celi, D. Chiesa, J. Corbett, I. Dafinei, S. Di Domizio, P. Di Stefano, S. Ghislandi, C. Gotti, D. L. Helis, R. Knobel, J. Kostensalo, J. Kotila, S. Nagorny, G. Pessina, S. Pirro, S. Pozzi, A. Puiu, S. Quitadamo, M. Sisti, J. Suhonen, S. Kuznetsov

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex), Nuclear Theory (nucl-th)

journal:

date:

2024-01-29 00:00:00

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.

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