The ground state of 149La is 221(6) keV/c² lighter than previously reported, eliminating a prominence in two-neutron separation energies for La isotopes and revealing a kink structure like that in Ce isotopes, interpreted as a shape transition from octupole deformation around N=91.
¨Ayst¨ o, Nuclear Physics A693, 477 (2001)
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New Ground State in ${}^{149}$La Removes Two-Neutron-Separation-Energy Anomaly in Lanthanum Isotopes
The ground state of 149La is 221(6) keV/c² lighter than previously reported, eliminating a prominence in two-neutron separation energies for La isotopes and revealing a kink structure like that in Ce isotopes, interpreted as a shape transition from octupole deformation around N=91.