Speaker
Max Pallas I Solis
(Universitat Politècnica de Catalunya (UPC))
Description
The rapid neutron capture process (r-process) is a key mechanism responsible for producing nearly half of the nuclei heavier than iron in explosive scenarios. In the solar-system abundance pattern, the Rare-Earth Peak (REP) around mass number $A = 160$ represents a significant feature resulting from freeze-out during the final stages of neutron exposure. The BRIKEN collaboration [1] conducted extensive measurements of $\beta$-decay properties of nuclei of interest to better understand the r-process at the Radioactive Isotope Beam Factory (RIBF), RIKEN Nishina Center, Japan. Our study focuses on the Barium to Neodymium region crucial for REP r-process nucleosynthesis [2,3]. In this contribution, we present the final experimental results from the BRIKEN-REP experiment, which yielded new $T_{1/2}$ and $P_{1n}$ branching ratios. Furthermore, we discuss the implications of these findings for global models of nuclear structure, aiming to refine theoretical predictions and enhance our understanding of REP r-process nucleosynthesis.
[1] J.L. Tain et. al , Acta Physica Polonica B {49(03), 417 $-$ 428 (2018).
[2] M. R. Mumpower et al , Phys. Rev. C 85, 045801 (2012).
[3] A. Arcones and G. Martinez Pinedo , Phys. Rev. C 83, 045809 (2011).
Primary authors
Max Pallas I Solis
(Universitat Politècnica de Catalunya (UPC))
Ariel Tarifeno-Saldivia
(Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València)
Co-authors
Gabriel Martínez-Pinedo
(GSI Helmholtzzentrum für Schwerionenforschung)
Gábor Gyula Kiss
(HUN-REN Institute for Nuclear Research)
Jose L. Tain
(Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València)
Alvaro Tolosa-Delgado
(University of Jyväskylä)
Dr
C. E. P. Robin
(GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany Fakultät für Physik, Universität Bielefeld, D-33615, Bielefeld, Germany)
Ms
D. Alvear-Terrero
(Institut für Kernphysik (Theoriezentrum), Fachbereich Physik, Technische Universität Darmstadt, Schlossgartenstraße 2, 64298 Darmstadt, Germany.)
András Vitéz-Sveiczer
(HUN-REN Institute for Nuclear Research)
Francisco Calvino
(Universitat Politecnica de Catalunya (UPC))
Jorge Agramunt
(Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València)
Dr
P. Aguilera
(Centro de Investigación en Física Nuclear y Espectroscopía de Neutrones (CEFNEN). Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, Las Condes, Santiago-Chile.)
Alejandro Algora
(Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València)
Dr
J. M. Allmond
(Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA.)
Hidetada Baba
(RIKEN Nishina Center)
Dr
N. T. Brewer
(Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.)
Roger Caballero-Folch
(TRIUMF)
Dr
P. J. Coleman-Smith
(TFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom.)
Dr
G. Cortes
(Institut de Tècniques Energètiques (INTE), Universitat Politècnica de Catalunya (UPC), 08028 Barcelona, Spain.)
Tom Davinson
(University of Edinburgh)
Iris Dillmann
(TRIUMF)
Cesar Domingo Pardo
(IFIC (CSIC - University of Valencia))
Alfredo Estrade
(Central Michigan University)
Naoki Fukuda
(RIKEN Nishina Center)
Shintaro Go
(RIKEN Nishina Center, Japan)
Christopher J. Griffin
(TRIUMF)
Robert Grzywacz
(University of Tennessee)
Oscar Hall
(University of Edinburgh)
Dr
L. J. Harkness-Brennan
(Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom.)
Tadaaki Isobe
(RIKEN Nishina Center)
Dr
D. Kahl
(School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.)
Dr
T. T. King
(Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.)
Dr
A. Korgul
(Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland.)
Sándor Kovács
(HUN-REN Institute for Nuclear Research)
Shigeru Kubono
(RIKEN Nishina Center, Japan)
Dr
M. Labiche
(STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom.)
JiaJian Liu
(Department of Physics, the University of Hong Kong)
Dr
M. Madurga
(Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.)
Dr
K. Miernik
(Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland.)
Dr
F. Molina
(Centro de Investigación en Física Nuclear y Espectroscopía de Neutrones (CEFNEN). Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, Las Condes, Santiago-Chile.)
Mr
N. Mont-Geli
(Institut de Tècniques Energètiques (INTE), Universitat Politècnica de Catalunya (UPC), 08028 Barcelona, Spain.)
Anabel Morales
(Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València)
Dr
E. Nacher
(Instituto de Física Corpuscular (IFIC), CSIC-UV, E-46980 Paterna, Spain.)
Dr
A. Navarro
(Institut de Tècniques Energètiques (INTE), Universitat Politècnica de Catalunya (UPC), 08028 Barcelona, Spain.)
Neerajan Nepal
(Central Michigan University)
Shunji Nishimura
(RIKEN Nishina Center)
Dr
M. Piersa-Silkowska
(aculty of Physics, University of Warsaw, 02-093 Warsaw, Poland.)
Dr
P. Phong
(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.)
B. C. Rasco
(Physics Division, Oak Ridge National Laboratory, Oak Ridge, USA)
Dr
J. Romero-Barrientos
(Centro de Investigación en Física Nuclear y Espectroscopía de Neutrones (CEFNEN). Comisión Chilena de Energía Nuclear, Nueva Bilbao 12501, Las Condes, Santiago-Chile.)
Dr
B. Rubio
(Instituto de Física Corpuscular (IFIC), CSIC-UV, E-46980 Paterna, Spain.)
Krzysztof P. Rykaczewski
(Oak Ridge National Laboratory)
Dr
Y. Saito
(TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada)
Hiroyoshi Sakurai
(RIKEN Nishina Center)
Yohei Shimizu
(RIKEN Nishina Center)
Dr
M. Singh
(Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.)
T. Sumikama
(RIKEN Nishina Center, Japan)
Hiroshi Suzuki
(RIKEN Nishina Center)
Tibor Norbert Szegedi
(INFN-LNS)
Hiroygbri Takeda
(RIKEN Nishina Center)
Dr
K. Wang
(Central Michigan University, Mt. Pleasant, MI 48859, USA)
M. Wolinska-Cichocka
(eavy Ion Laboratory, University of Warsaw, Poland)
Philip J. Woods
(University of Edinburgh)
Rin Yokoyama
(Center for Nuclear Study (CNS), The University of Tokyo)
