The isovector dipole strength in nuclei with extreme neutron excess

Details The isovector dipole strength in nuclei with extreme neutron excess The isovector dipole strength in nuclei with extreme neutron excess

2008-12-10

arxiv.org/abs/0812.1952v1

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

The E1 strength is systematically analyzed in very neutron-rich Sn nuclei, beyond $^{132}$Sn until $^{166}$Sn, within the Relativistic Quasiparticle Random Phase Approximation. The great neutron excess favors the appearance of a deformed ground state for $^{142-162}$Sn. 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 $^{132}$Sn for the experimental study of low-lying E1 strength.

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