arXiv 1810.070892018-10-16nucl-ex

富中子$^{130}$ Cd和$^{131}$ In的半衰期

Half-Lives of Neutron Rich $^{130}$Cd and $^{131}$In

R. Dunlop, C. E. Svensson, C. Andreoiu, G. C. Ball, N. Bernier, V. Bildstein, H. Bidaman, P. Boubel, C. Burbadge, R. Caballero-Folch, I. Dillmann, M. R. Dunlop,… 展开作者

R. Dunlop, C. E. Svensson, C. Andreoiu, G. C. Ball, N. Bernier, V. Bildstein, H. Bidaman, P. Boubel, C. Burbadge, R. Caballero-Folch, I. Dillmann, M. R. Dunlop, L. J. Evitts, F. H. Garcia, A. B. Garnsworthy, P. E. Garrett, G. Hackman, S. Hallam, J. Henderson, S. Ilyushkin, A. Jungclaus, R. Krücken, J. Lassen, R. Li, E. MacConnachie, A. D. MacLean, E. McGee, M. Moukaddam, D. Mücher, B. Olaizola, K. Ortner, E. Padilla-Rodal, J. Park, O. Paetkau, J. L. Pore, A. J. Radich, P. Ruotsalainen, J. Smallcombe, J. K. Smith, A. Teigelhöfer, J. Turko, K. Whitmore, T. Zidar

备注：: Talk presented CIPANP2018. 9 pages, LaTeX, 5 pdf figures, 1 png figure

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摘要：

$N=82$壳层闭合周围同位素的半衰期是天体物理模拟的重要组成部分，它强烈影响着$A\sim130$区域中第二个$r$过程丰度峰的大小。最富中子的$N=82$核是目前这一代放射性束设施所无法获得的，因此$N=82$过程模拟必须依赖于对所涉及同位素半衰期的计算。在这一地区的实验可访问的核的半衰期测量是重要的，以基准这些计算。$^{130}$ Cd的半衰期是特别重要的，因为它被用来调整壳模型计算中的Gamow-Teller淬灭，用于该区域中其他核的$β$衰变。在这项工作中，GRIFFIN $γ$ -射线光谱仪在TRIUMF-ISAC设施被用来测量的$^{130}_{~48}$镉$_{82}$的半衰期为$T_{1/2}= 126(4)$毫秒。此外，$^{131}_{~49}$在$_{82}$的三个$β$衰变状态的半衰期被测量为$T_{1/2}(1/2^-)=328(15)$毫秒，$T_{1/2}(9/2^+)=265(8)$毫秒，和$T_{1/2}(21/2^+)=323(50)$毫秒，分别提供了一个重要的基准在这个地区的半衰期计算。

英文摘要：

The half-lives of isotopes around the $N=82$ shell closure are an important ingredient in astrophysical simulations and strongly influence the magnitude of the second $r$-process abundance peak in the $A\sim130$ region. The most neutron-rich $N=82$ nuclei are not accessible to the current generation of radioactive beam facilities and $r$-process simulations must therefore rely on calculations of the half-lives of the isotopes involved. Half-life measurements of the experimentally accessible nuclei in this region are important in order to benchmark these calculations. The half-life of $^{130}$Cd is particularly important as it is used to tune the Gamow-Teller quenching in shell-model calculations for the $β$ decay of other nuclei in this region. In this work, the GRIFFIN $γ$-ray spectrometer at the TRIUMF-ISAC facility was used to measure the half-life of $^{130}_{~48}$Cd$_{82}$ to be $T_{1/2}= 126(4)$ ms. In addition, the half-lives of the three $β$ decaying states of $^{131}_{~49}$In$_{82}$ were measured to be $T_{1/2}(1/2^-)=328(15)$ ms, $T_{1/2}(9/2^+)=265(8)$ ms, and $T_{1/2}(21/2^+)=323(50)$ ms, respectively, providing an important benchmark for half-life calculations in this region.

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