Speaker
Description
Isobaric analog resonances (AR) are investigated within the framework of the
microscopic theory of finite Fermi systems (TFFS) and in an approximate approach.
These studies began about 50 years ago [1–3] and are currently being successfully
continued in the self-consistent TFFS approach [4].
The calculations were performed for a large number of spherical and deformed
nuclei, and the calculated energies $E_{AR}$ are in good agreement with the experimental
data. Since the $E_{AR}$ energies are linearly related to the Coulomb energies $Q_{EC}$ and, in
the model approximation, to the charge radii $R_C$ of atomic nuclei, the corresponding
recalculations for $Q_{EC}$ and $R_C$ were carried out and good agreement with the
experimental data was obtained.
The most complete experimental studies of charge-exchange excitations in 9 tin
isotopes with A = 112 – 124 were carried out [5] in the Sn( 3He, t)Sb reaction.
Recently, studies have been carried out on charge-exchange resonances in the
neutron-rich isotope 132Sn [6] in the 132Sn(p, n) 132Sb reaction. Comparison of the
obtained data with calculations by TFFS made it possible to determine the parameter
of the local isospin – isospin interaction [7] and demonstrated a linear dependence of
the energy $E_{AR}$ on the isotopic parameter $(N – Z)/A$. Calculations for Sn isotopes were
carried out up to the value A = 140.
The work was done under financial support of Russian Scientific Foundation
(project RSF № 21-12-00061).
- D. F. Zaretskii, M. G. Urin, Sov. Phys. JETP, 26, 34 (1968).
- Yu. S. Lyutostansky, Yad. Phys., 10, 198 (1969).
- Yu. V. Gaponov, Yu. S. Lyutostansky, Yad. Phys., 16, 484 (1972).
- N. Borzov, S.V. Tolokonnikov, Phys. At. Nucl., 82, 560 (2019).
- K. Pham et al., Phys. Rev. C 51, 526 (1995).
- J. Yasuda et al., Phys. Rev. Lett. 121, 132501 (2018).
- Yu.S. Lutostansky, Phys. At. Nucl., 83, 33 (2020)..
