학술논문
Half-Lives of Neutron Rich $^{130}$Cd and $^{131}$In
Document Type
Working Paper
Author
Dunlop, R.; Svensson, C. E.; Andreoiu, C.; Ball, G. C.; Bernier, N.; Bildstein, V.; Bidaman, H.; Boubel, P.; Burbadge, C.; Caballero-Folch, R.; Dillmann, I.; Dunlop, M. R.; Evitts, L. J.; Garcia, F. H.; Garnsworthy, A. B.; Garrett, P. E.; Hackman, G.; Hallam, S.; Henderson, J.; Ilyushkin, S.; Jungclaus, A.; Krücken, R.; Lassen, J.; Li, R.; MacConnachie, E.; MacLean, A. D.; McGee, E.; Moukaddam, M.; Mücher, D.; Olaizola, B.; Ortner, K.; Padilla-Rodal, E.; Park, J.; Paetkau, O.; Pore, J. L.; Radich, A. J.; Ruotsalainen, P.; Smallcombe, J.; Smith, J. K.; Teigelhöfer, A.; Turko, J.; Whitmore, K.; Zidar, T.
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Subject
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Abstract
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 $\beta$ decay of other nuclei in this region. In this work, the GRIFFIN $\gamma$-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 $\beta$ 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.
Comment: Talk presented CIPANP2018. 9 pages, LaTeX, 5 pdf figures, 1 png figure
Comment: Talk presented CIPANP2018. 9 pages, LaTeX, 5 pdf figures, 1 png figure