학술논문
$\beta$-Decay Half-Lives of 55 Neutron-Rich Isotopes beyond the N=82 Shell Gap
Document Type
Working Paper
Author
Wu, J.; Nishimura, S.; Möller, P.; Mumpower, M. R.; Lozeva, R.; Moon, C. B.; Odahara, A.; Baba, H.; Browne, F.; Daido, R.; Doornenbal, P.; Fang, Y. F.; Haroon, M.; Isobe, T.; Jung, H. S.; Lorusso, G.; Moon, B.; Patel, Z.; Rice, S.; Sakurai, H.; Shimizu, Y.; Sinclair, L.; Söderström, P. -A.; Sumikama, T.; Watanabe, H.; Xu, Z. Y.; Yagi, A.; Yokoyama, R.; Ahn, D. S.; Garrote, F. L. Bello; Daugas, J. M.; Didierjean, F.; Fukuda, N.; Inabe, N.; Ishigaki, T.; Kameda, D.; Kojouharov, I.; Komatsubara, T.; Kubo, T.; Kurz, N.; Kwon, K. Y.; Morimoto, S.; Murai, D.; Nishibata, H.; Schaffner, H.; Sprouse, T. M.; Suzuki, H.; Takeda, H.; Tanaka, M.; Tshoo, K.; Wakabayashi, Y.
Source
Subject
Language
Abstract
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 ($A$ $\approx$ 130) peak.