Half-life measurement using implant-( - ) time correlations in the region of neutron-rich lanthanides

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

ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT（2023）

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摘要

Neutron-rich lanthanides were produced via in-flight fission of a U-238 primary beam at the RIBF, RIKEN Nishina Center to measure half-lives (T-1/2) and beta-delayed neutron emission probabilities (P-n) in order to constrain r-process abundance calculations. Pm159-166, Sm161-168, Eu165-170, and Gd167-172 ions were implanted in the Advanced Implantation Detector Array (AIDA), and beta-delayed neutrons and gamma-rays were detected by the surrounding detector array (BRIKEN). For the validation of T-1/2 values derived from implantation-beta (i-beta) time correlations, gamma-spectroscopic methods were used as well. The experimental results of the beta-delayed gamma-spectroscopy of Pm-162 are presented here as an example. A half-life value from gamma-decay curves was derived with a comparable uncertainty to the result from the i-beta method, and a mean value well within the 1 sigma range.

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