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• W4311191202 abstract "Neutrinoless double beta decay ($0ensuremath{nu}ensuremath{beta}ensuremath{beta}$) processes sample a wide range of intermediate forbidden nuclear transitions, which may be impacted by quenching of the axial vector coupling constant (${g}_{A}/{g}_{V}$), the uncertainty of which plays a pivotal role in determining the sensitivity reach of $0ensuremath{nu}ensuremath{beta}ensuremath{beta}$ experiments. In this Letter, we present measurements performed on a high-resolution ${mathrm{LiInSe}}_{2}$ bolometer in a ``$text{source}=text{detector}$'' configuration to measure the spectral shape of the fourfold forbidden $ensuremath{beta}$ decay of $^{115}mathrm{In}$. The value of ${g}_{A}/{g}_{V}$ is determined by comparing the spectral shape of theoretical predictions to the experimental $ensuremath{beta}$ spectrum taking into account various simulated background components as well as a variety of detector effects. We find evidence of quenching of ${g}_{A}/{g}_{V}$ at $>5ensuremath{sigma}$ with a model-dependent quenching factor of $0.655ifmmodepmelsetextpmfi{}0.002$ as compared to the free-nucleon value for the interacting shell model. We also measured the $^{115}mathrm{In}$ half-life to be $[5.18ifmmodepmelsetextpmfi{}0.06(mathrm{stat}{)}_{ensuremath{-}0.015}^{+0.005}(mathrm{sys})]ifmmodetimeselsetexttimesfi{}{10}^{14}text{ }text{ }mathrm{yr}$ within the interacting shell model framework. This Letter demonstrates the power of the bolometeric technique to perform precision nuclear physics single-$ensuremath{beta}$ 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 $0ensuremath{nu}ensuremath{beta}ensuremath{beta}$ sensitivity calculations." @default.
• W4311191202 created "2022-12-24" @default.
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• W4311191202 date "2022-12-02" @default.
• W4311191202 modified "2023-10-18" @default.
• W4311191202 title "Determining <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:msub><mml:mo stretchy=false>/</mml:mo><mml:msub><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mi>V</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> with High-Resolution Spectral Measurements Using a <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><…" @default.
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• W4311191202 doi "https://doi.org/10.1103/physrevlett.129.232502" @default.
• W4311191202 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36563213" @default.
• W4311191202 hasPublicationYear "2022" @default.
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