论文标题
部分可观测时空混沌系统的无模型预测
Determining $g_{A}/g_{V}$ with High Resolution Spectral Measurements Using an LiInSe$_2$ Bolometer
论文作者
论文摘要
中产阶级双β衰减（0 $νβ$）的过程采样了广泛的中间禁止的核过渡，这可能会受到轴向矢量偶联常数（$ g_a/g_v $）的猝灭影响，其不确定性在确定敏感性达到0 $ $ c $ c的敏感性中起着至关重要的作用。在这封信中，我们介绍了在“'source =检测器”配置中进行的高分辨率liinse $ _ {2} $ 〜BOLOMETER进行的测量值，以测量$^{115} $的4倍禁止$β$ -Decay的光谱形状。 $ g_a/g_v $的值是通过将理论预测的光谱与实验$β$频谱进行比较，考虑到各种模拟背景组件以及各种检测器效应。我们发现，与相互作用的壳模型的自由核定值相比，我们发现$ g_a/g_v $在$>5σ$上的淬火为$>5σ$。我们还以半寿命测量了$^{115} $为[$ 5.18 \ pm0.06（\ text {stat。}）^{+0.005} _ { - 0.015}（\ text {sys。}）]这项工作证明了验光技术对执行精确核物理学单一$β$衰减测量的功能，这可以帮助减少计算$0νββ$核基质元素的不确定性。
Neutrinoless Double-Beta decay (0$νββ$) 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 0$νββ$ experiments. In this Letter, we present measurements performed on a high-resolution LiInSe$_{2}$~ bolometer in a ''source=detector'' configuration to measure the spectral shape of the 4-fold forbidden $β$-decay of $^{115}$In. The value of $g_A/g_V$ 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 $g_A/g_V$ at $>5σ$ with a model-dependent quenching factor of $0.655\pm0.002$ as compared to the free-nucleon value for the Interacting Shell Model. We also measured the $^{115}$In half-life to be [$5.18\pm0.06(\text{stat.})^{+0.005}_{-0.015}(\text{sys.})]\times{10}^{14}$ yr within the Interacting Shell Model framework. This work demonstrates the power of the bolometeric technique to perform precision nuclear physics single-$β$ decay measurements, which can help reduce the uncertainties in the calculation of $0νββ$ nuclear matrix elements.
