Abstract
The evolution of low‐lying 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 spherical nuclei like 132Sn for the experimental study of low‐lying E1 strength.
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