HAL : hal-00345965, version 1
 arXiv : 0812.1952
 The isovector dipole strength in nuclei with extreme neutron excess
 (08/12/2008)
 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.
 Domaine : Physique/Physique Nucléaire Théorique
 Mots Clés : QRPA – RMF – pygmy – GDR – deformed
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 hal-00345965, version 1 http://hal.archives-ouvertes.fr/hal-00345965 oai:hal.archives-ouvertes.fr:hal-00345965 Contributeur : Daniel Pena Arteaga <> Soumis le : Mercredi 10 Décembre 2008, 16:40:04 Dernière modification le : Mercredi 10 Décembre 2008, 17:27:46