The $\beta$ decays of ${}^{103,104m}\mathrm{Nb}$ were studied with the Summing NaI(Tl) (SuN) detector at the National Superconducting Cyclotron Laboratory. The $\beta$-decay feeding intensity distribution $I_{\beta }\left(E\right)$ for each isotope was extracted by measuring $\gamma$ rays in coincidence with an emitted electron. The $I_{\beta }\left(E\right)$ was extracted via the total absorption spectroscopy technique. The $I_{\beta }\left(E\right)$ for each nucleus was compared to predictions made by the quasiparticle random-phase approximation (QRPA) model which is commonly used to calculate $\beta$-decay properties for astrophysical applications. The main goal was to provide experimental data for neutron-rich nuclei, relevant to the astrophysical $r$ process. In addition, the extracted $\beta$-decay feeding intensity distributions can lead to a better understanding of nuclear structure in a region of rapid structure changes around $A=100$. Finally, experimental data for ${}^{104m}\mathrm{Nb}$ are also of interest to antineutrino studies of nuclear reactors.

中文翻译：

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Nb103,104m的β衰变进食强度分布

这 $\beta$ 的衰变 ${}^{103，104米}铌$在国家超导回旋加速器实验室使用Suiming NaI（Tl）（SuN）检测器进行了研究。这$\beta$衰变进食强度分布 ${\mathrm{一世}}_{\beta }（Ë）$ 通过测量来提取每个同位素 $\gamma$射线与发射的电子重合。这${\mathrm{一世}}_{\beta }（Ë）$通过总吸收光谱技术提取。这${\mathrm{一世}}_{\beta }（Ë）$ 将每个核的原子与准粒子随机相位近似（QRPA）模型做出的预测进行比较，该模型通常用于计算 $\beta$天体应用的衰减特性。主要目的是提供与天体物理学有关的富中子核的实验数据$\mathrm{[R}$过程。另外，提取$\beta$衰减的进食强度分布可以导致对周围结构快速变化的区域中的核结构有更好的了解 $\mathrm{一种}=100$。最后，实验数据${}^{104米}铌$ 核反应堆的反中微子研究也很有趣。