2024/12/29 by Xiao Lu, Hiroyuki Sagawa, Lu, Xiao +3
Physics and Astronomy · Chemistry · #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Advanced NMR Techniques and Applications
paper · pdf · doi:10.48550/arxiv.2412.20479
We study the soft electric dipole (E1) response of deformed halo nuclei 31Ne and 37Mg using a deformed Woods-Saxon potential, with the potential depth adjusted to reproduce empirical separation energy of last neutron orbit, i.e., 150 keV for 31Ne and 220 keV for 37Mg. The configuration dependence of the E1 strength near the neutron threshold is pointed out. The halo configurations [321]3/2 at β2=0.5 and [330]1/2 at β2=0.24 in 31Ne contain large amplitudes of halo p-shell orbits, which significantly enhance the threshold strength by several times compared to the non-halo configuration [202]5/2 at β2=0.32. In 37Mg, the last neutron configuration is assigned as [321]1/2 at a large deformation of β2=0.46, which involves a halo p-shell configuration that significantly enhances the soft dipole strength. This enhancement is about 60% larger than that of the [321]3/2 configuration in 31Ne because of large p-shell probability in 37Mg. Experimental confirmation of the soft dipole strength is highly desired to determine the deformation and the configuration of the last neutron orbits both in 31Ne and 37Mg.