133In: A Rosetta Stone for decays of r-process nuclei

Author:

Z. Y. Xu, M. Madurga, R. Grzywacz, T. T. King, A. Algora, A. N. Andreyev, J. Benito, T. Berry, M. J. G. Borge, C. Costache, H. De Witte, A. Fijalkowska, L. M. Fraile, H. O. U. Fynbo, A. Gottardo, C. Halverson, L. J. Harkness-Brennan, J. Heideman, M. Huyse, A. Illana, Ł. Janiak, D. S. Judson, A. Korgul, T. Kurtukian-Nieto, I. Lazarus, R. Lică, R. Lozeva, N. Marginean, R. Marginean, C. Mazzocchi, C. Mihai, R. E. Mihai, A. I. Morales, R. D. Page, J. Pakarinen, M. Piersa-Siłkowska, Zs. Podolyák, P. Sarriguren, M. Singh, Ch. Sotty, M. Stepaniuk, O. Tengblad, A. Turturica, P. Van Duppen, V. Vedia, S. Viñals, N. Warr, R. Yokoyama, C. X. Yuan

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex), Nuclear Theory (nucl-th)

journal:

date:

2023-06-01 16:00:00

Abstract

The $\beta$ decays from both the ground state and a long-lived isomer of $^{133}$In were studied at the ISOLDE Decay Station (IDS). With a hybrid detection system sensitive to $\beta$, $\gamma$, and neutron spectroscopy, the comparative partial half-lives (logft) have been measured for all their dominant $\beta$-decay channels for the first time, including a low-energy Gamow-Teller transition and several First-Forbidden (FF) transitions. Uniquely for such a heavy neutron-rich nucleus, their $\beta$ decays selectively populate only a few isolated neutron unbound states in $^{133}$Sn. Precise energy and branching-ratio measurements of those resonances allow us to benchmark $\beta$-decay theories at an unprecedented level in this region of the nuclear chart. The results show good agreement with the newly developed large-scale shell model (LSSM) calculations. The experimental findings establish an archetype for the $\beta$ decay of neutron-rich nuclei southeast of $^{132}$Sn and will serve as a guide for future theoretical development aiming to describe accurately the key $\beta$ decays in the rapid-neutron capture (r-) process.

PDF: 133In: A Rosetta Stone for decays of r-process nuclei.pdf