Orateur
Description
This presentation will explore the shell evolution across the neutron dripline by showing recent experimental results on the spectroscopy of exotic nuclei around N=20, utilizing the SAMURAI (large-acceptance multi-purpose spectrometer) at RIBF, RIKEN. The O-Ne dripline region represents the neutron-rich frontier, offering unique opportunities to study phenomena near and beyond the neutron dripline. We will focus on two key topics: the deformed halo nucleus 31Ne and the doubly-magic candidate nucleus 28O (Z=8, N=20).
For 31Ne (Z=10, N=21), we present kinematically complete measurements conducted with both Pb and C targets. The Pb-target-induced reactions are primarily governed by Coulomb breakup, while the C-target-induced reactions involve inelastic excitation, one-proton removal from 32Na, and one-neutron removal from 32Ne. These experimental results provide insights into the shell-evolution, deformation, and halo properties of 31Ne.
Regarding 28O, we discuss the recent observation of this nucleus and the phenomenon of shell melting at N=20 beyond the neutron dripline [1]. We will also cover future perspectives on the spectroscopy of extremely neutron-rich nuclei, emphasizing the implications for shell evolution.
[1] Y. Kondo et al., Nature 620, 964 (2023).
