Speaker
Description
Having unique abilities in theoretical investigations of various giant resonances in medium-heavy-mass magic nuclei, the semi-microscopic Particle-Hole Dispersive Optical Model (PHDOM) has been implemented, in particular, to describing main properties of Gamow-Teller (GT) resonance in mentioned parent nuclei [1]. In the present work, this study is continued, being aimed to deduce from a comparison of calculated and experimental GT strength distributions the (dimensionless) strength g’ of the spin-isospin part of Landau-Migdal p-h interaction and also the quenching factor Q. Apart from these quantities, the mean-field parameters (taken from independent data [1]) and the “spreading” parameters (appeared in the energy-averaged p-h self-energy term responsible for the spreading effect) are the input quantities used in the employed implementation of PHDOM. For nuclei under consideration, the values of g’ and Q, and “spreading” parameters are deduced (by the χ^2 -method) from a comparison of experimental and calculated within PHDOM the GT strength distributions in wide excitation-energy intervals. The deduced values given in the Table
Niclei 48Ca 90Zr 132Sn 208Pb
g' 0,75 0,69 0,63 0,61
Q 0,67 0,70 0,67 0,73
are in reasonable agreement with the quantities deduced in Ref. [2] from a description of nuclear magnetic moments within Migdal’s Finite-Fermi-System Theory.
References
[1] V.I.Bondarenko, M.H.Urin. Phys.Rev. C 106, 024331 (2022).
[2] I.N. Borzov, E.E. Saperstein, S.V. Tolokonnikov. Phys. At. Nucl. 71, 469 (2008).
