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The isovector dipole strength in nuclei with extreme neutron excess
Daniel Pena Arteaga1, E. Khan1, Peter Ring2

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  TUM - Physik Department
Physique/Physique Nucléaire Théorique
QRPA – RMF – pygmy – GDR – deformed
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