Ponente
Descripción
The r-process, also known as the rapid neutron capture process, plays a crucial role in the formation of more than half of the elements that are heavier than iron. To shed light on this process, the BRIKEN collaboration [1] has conducted extensive measurements of the β-decay properties of important nuclei at the Radioactive Isotope Beam Factory (RIBF) located at the RIKEN Nishina Center in Japan. During the freeze-out phase at the end of neutron exposure, a distinctive feature called the Rare-Earth Peak (REP) emerges in the solar abundance distribution around mass number A=160. This study focuses on the region from Ba to Nd, which is essential for understanding REP nucleosynthesis in the r-process, as indicated by sensitivity studies [2, 3]. In this work, we present the final results from the BRIKEN-REP experiment, which include newly determined branching ratios for $T_{1/2}$ and $P_{1n}$. Additionally, we offer new theoretical nuclear structure calculations to enhance our understanding of the r-process.
[1] J.L. Tain et. al , Acta Physica Polonica B 49(03), 417 $-$ 428 (2018). \newline
[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).
