$\beta$-decay half-lives of 55 neutron-rich isotopes beyond the $N=82$ shell gap

J. Wu, S. Nishimura, P. Möller, M. Mumpower, R. Lozeva, C. B. Moon, A. Odahara, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, M. Haroon, T. Isobe, H. S. Jung, G. Lorusso, B. Moon, Z. Patel, S. Rice, H. Sakurai, Y. Shimizu, L. Sinclair, P. A. Soderstrom, T. Sumikama, H. Watanabe, Z. Y. Xu, A. Yagi, R. Yokoyama, D. Ahn, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, N. Fukuda, N. Inabe, T. Ishigaki, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, N. Kurz, K. Y. Kwon, S. Morimoto, D. Murai, H. Nishibata, H. Schaffner, T. M. Sprouse, H. Suzuki, H. Takeda, M. Tanaka, K. Tshoo, Y. Wakabayashi

Published PRC rapid communication (2020)

The $\beta$-decay half-lives of 55 neutron-rich nuclei $^{134−139}$Sn, $^{134−142}$Sb, $^{137−144}$Te, $^{140−146}$I, $^{142−148}$Xe, $^{145−151}$Cs, $^{148−153}$Ba, $^{151−155}$La were measured at the Radioactive Isotope Beam Factory (RIBF) employing the projectile fission fragments of $^{238}$U. The nuclear level structure, which relates to deformation, has a large effect on the half-lives. The impact of newly-measured half-lives on modeling the astrophysical origin of the heavy elements is studied in the context of r process nucleosynthesis. For a wide variety of astrophysical conditions, including those in which fission recycling occurs, the half-lives have an important local impact on the second ($A \sim 130$) peak.

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