Abstract
One of the prominent features of the solar system abundance is the smaller and broader peak at A~165, known as a rare-earth peak (REE). The mechanism behind the formation is of particular interest and continues to be controversial. A dynamical formation mechanism has been suggested to explain the production of REE, which assumes the r-process path encounters the special structure, such as a deformed sub-shell at N=104, in masses, beta-decay (half-lives and beta-delayed neutron emission probability).
This presentation will focus on experimental conditions. The relevant isotopes (Z=60-68, N=101-108) will be produced and studied at the Radioactive Isotope Beam Factory (RIBF), RIKEN. The two-neutron separation energies derived from high-precision mass measurements are the most straightforward indicator to study the shell evolution. The beta-decay spectroscopy will also constrain uncertainties in the r-process calculations to reproduce the REE. The results are expected to reveal the formation mechanism of REE.
Anyone interested is welcome to attend.