A1 Journal article (refereed)
Determining gA/gV with High-Resolution Spectral Measurements Using a LiInSe2 Bolometer (2022)

Leder, A. F., Mayer, D., Ouellet, J. L., Danevich, F. A., Dumoulin, L., Giuliani, A., Kostensalo, J., Kotila, J., de Marcillac, P., Nones, C., Novati, V., Olivieri, E., Poda, D., Suhonen, J., Tretyak, V. I., Winslow, L., & Zolotarova, A. (2022). Determining gA/gV with High-Resolution Spectral Measurements Using a LiInSe2 Bolometer. Physical Review Letters, 129(23), Article 232502. https://doi.org/10.1103/PhysRevLett.129.232502

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Publication details

All authors or editors: Leder, A. F.; Mayer, D.; Ouellet, J. L.; Danevich, F. A.; Dumoulin, L.; Giuliani, A.; Kostensalo, J.; Kotila, J.; de Marcillac, P.; Nones, C.; et al.

Journal or series: Physical Review Letters

ISSN: 0031-9007

eISSN: 1079-7114

Publication year: 2022

Publication date: 02/12/2022

Volume: 129

Issue number: 23

Article number: 232502

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevLett.129.232502

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/85154

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2206.06559

Abstract

Neutrinoless double beta decay (0νββ) processes sample a wide range of intermediate forbidden nuclear transitions, which may be impacted by quenching of the axial vector coupling constant (gA/gV), the uncertainty of which plays a pivotal role in determining the sensitivity reach of 0νββ experiments. In this Letter, we present measurements performed on a high-resolution LiInSe2 bolometer in a “source = detector” configuration to measure the spectral shape of the fourfold forbidden β decay of 115In. The value of gA/gV is determined by comparing the spectral shape of theoretical predictions to the experimental β spectrum taking into account various simulated background components as well as a variety of detector effects. We find evidence of quenching of gA/gV at >5σ with a model-dependent quenching factor of 0.655±0.002 as compared to the free-nucleon value for the interacting shell model. We also measured the 115In half-life to be [5.18±0.06(stat)+0.005−0.015(sys)]×1014 yr within the interacting shell model framework. This Letter demonstrates the power of the bolometeric technique to perform precision nuclear physics single-β decay measurements, which along with improved nuclear modeling can help reduce the uncertainties in the calculation of several decay nuclear matrix elements including those used in 0νββ sensitivity calculations.

Keywords: nuclear physics

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Ministry reporting: Yes

Reporting Year: 2022

JUFO rating: 3