The isovector dipole strength in nuclei with extreme neutron excess

2008/12/10 by Arteaga, Daniel Pena, Khan, E., Ring, Peter
#FOS: Physical sciences #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.0812.1952

Abstract

The E1 strength is systematically analyzed in very neutron-rich Sn nuclei, beyond ¹³²Sn until ¹⁶⁶Sn, within the Relativistic Quasiparticle Random Phase Approximation. The great neutron excess favors the appearance of a deformed ground state for ^142-162Sn. The evolution of the low-lying strength in deformed nuclei is determined by the interplay of two factors, isospin asymmetry and deformation: while greater neutron excess increases the total low-lying strength, deformation hinders and spreads it. Very neutron rich deformed nuclei may not be as good candidates as stable spherical nuclei like ¹³²Sn for the experimental study of low-lying E1 strength.

Related

• Low-energy quadrupole collectivity of Sn nuclei in self-consistent calculations with a semi-realistic interaction
• Systematic study of the low-lying electric dipole strength in Sn isotopes and its astrophysical implications
• B(E2) anomaly in 6⁺ isomers of ^134-138Sn isotopes and neutron single-particle energies beyond N=82
• A new scissors mode on the skin of deformed neutron rich nuclei
• Dipole response of deformed halo nuclei ³¹Ne and ³⁷Mg