The isovector dipole strength in nuclei with extreme neutron excess
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.
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