Tin Anomaly in Coulomb Energies and Analog Resonances of Neutron-Rich Tin Isotopes

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Abstract

An anomaly in the distribution of Coulomb energies of tin isotopes (Sn anomaly) is determined. This anomaly manifests itself as follows: in the mass-number (@) dependence of @ for the isotopes @ Sn, experimental data on @  show a linear dependence close to a constant. The Coulomb energy difference @ between the Sn–Sb neighboring isobaric nuclei is approximated by a two-parameter expression. The energies of isobaric analog resonances, @, for the isotopes 
Sn are calculated both on the basis of the resulting @ approximation within a @ phenomenological model and on the basis of the microscopic theory of finite Fermi systems. The results are compared with experimental data on 
, and it is found that the phenomenological model describes the energies 
 quite accurately, and so do the new self-consistent relativistic model.

About the authors

Yu. S. Lutostansky

National Research Center Kurchatov Institute

Author for correspondence.
Email: lutostansky@yandex.ru
Moscow, Russia

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