Measuring the β-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

Kiss, G. G.; Vitéz-Sveiczer, A.; Saito, Y.; Tarifeño-Saldivia, A.; Pallas, M.; Tain, J. L.; Dillmann, I.; Agramunt, J.; Algora, A.; Domingo-Pardo, C.; Estrade, A.; Appleton, C.; Allmond, J. M.; Aguilera, P.; Baba, H.; Brewer, N. T.; Bruno, C.; Caballero-Folch, R.; Calvino, F.; Coleman-Smith, P. J.; Cortes, G.; Davinson, T.; Fukuda, N.; Ge, Z.; Go, S.; Griffin, C. J.; Grzywacz, R. K.; Hall, O.; Horváth, A.; Ha, J.; Harkness-Brennan, L. J.; Isobe, T.; Kahl, D.; King, T. T.; Korgul, A.; Kovács, S.; Krücken, R.; Kubono, S.; Labiche, M.; Liu, J.; Liang, J.; Madurga, M.; Miernik, K.; Molina, F.; Morales, A. I.; Mumpower, M. R.; Nacher, E.; Navarro, A.; Nepal, N.; Nishimura, S.; Piersa-Siłkowska, M.; Phong, V.; Rasco, B. C.; Rubio, B.; Rykaczewski, K. P.; Romero-Barrientos, J.; Sakurai, H.; Sexton, L.; Shimizu, Y.; Singh, M.; Sprouse, T.; Sumikama, T.; Surman, R.; Suzuki, H.; Szegedi, T. N.; Takeda, H.; Tolosa, A.; Wang, K.; Wolinska-Cichocka, M.; Woods, P.; Yokoyama, R.; Xu, Z.

doi:10.3847/1538-4357/ac80fc

Title: Measuring the β-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

Journal Article · Tue Sep 06 00:00:00 EDT 2022 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/ac80fc· OSTI ID:1885617

Kiss, G. G.; Vitéz-Sveiczer, A.; Saito, Y.; Tarifeño-Saldivia, A.; Pallas, M.; Tain, J. L.; Dillmann, I.; Agramunt, J.; Algora, A.; Domingo-Pardo, C.; Estrade, A.; Appleton, C.; Allmond, J. M.; Aguilera, P.; Baba, H.; Brewer, N. T.; Bruno, C.; Caballero-Folch, R.; Calvino, F.; Coleman-Smith, P. J. more »

Abstract The β -delayed neutron-emission probabilities of 28 exotic neutron-rich isotopes of Pm, Sm, Eu, and Gd were measured for the first time at RIKEN Nishina Center using the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array. The existing β -decay half-life ( T _1/2 ) database was significantly increased toward more neutron-rich isotopes, and uncertainties for previously measured values were decreased. The new data not only constrain the theoretical predictions of half-lives and β -delayed neutron-emission probabilities, but also allow for probing the mechanisms of formation of the high-mass wing of the rare-earth peak located at A ≈ 160 in the r -process abundance distribution through astrophysical reaction network calculations. An uncertainty quantification of the calculated abundance patterns with the new data shows a reduction of the uncertainty in the rare-earth peak region. The newly introduced variance-based sensitivity analysis method offers valuable insight into the influence of important nuclear physics inputs on the calculated abundance patterns. The analysis has identified the half-lives of ¹⁶⁸ Sm and of several gadolinium isotopes as some of the key variables among the current experimental data to understand the remaining abundance uncertainty at A = 167–172.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); Canadian Natural Sciences and Engineering Research Council (NSERC); National Science Foundation (NSF); UK Science and Technology Facilities Council (STFC); Spanish MICINN; Japan Society for the Promotion of Science (JSPS); Polish National Science Centre (NCN)

Grant/Contract Number:: FG02-96ER40983; AC05-00OR22725; NA0002132; SAPIN-2019-00030; SAPPJ-2017-00026; PHY-1714153; 17H06090; 20H05648; FPA2014-52823-C2-1-P; FPA2017-83946-C2-1-P; PID2019-104714GB-C21; 2019/33/N/ST2/03023; 2020/36/T/ST2/00547; 2020/39/B/ST2/02346

OSTI ID:: 1885617

Alternate ID(s):: OSTI ID: 1886490

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Vol. 936 Journal Issue: 2; ISSN 0004-637X

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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