A modified PR INW macroscopic model reproduces PDR energy trends in Ni, Sn and Pb isotopes when the neutron-proton interaction strength is tripled relative to the original INW value, and fitted systematics are given for the PDR share of the E1 energy-weighted sum rule.
Figure 5 demonstrates the dependence of the ratio ¯sp of the PDR to GDR sum rules for isotopes of Ni, Sn, Pb on the parameter of neutron-proton asymmetry I = ( N − Z)/A
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Systematics of characteristics of pygmy dipole resonances in medium-heavy and heavy atomic nuclei with neutron excess
A modified PR INW macroscopic model reproduces PDR energy trends in Ni, Sn and Pb isotopes when the neutron-proton interaction strength is tripled relative to the original INW value, and fitted systematics are given for the PDR share of the E1 energy-weighted sum rule.