Radioactive Sb129, which can be treated as a proton plus semimagic Sn128 core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2+ - πg7/2 multiplet members and candidate πd5/2 state were measured. The results indicate that the total electric quadrupole strength of Sb129 is a factor of 1.39(11) larger than the Sn128 core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.
Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129
Coraggio L.;Itaco N.;
2020
Abstract
Radioactive Sb129, which can be treated as a proton plus semimagic Sn128 core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2+ - πg7/2 multiplet members and candidate πd5/2 state were measured. The results indicate that the total electric quadrupole strength of Sb129 is a factor of 1.39(11) larger than the Sn128 core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
