Fine structure of the dipole excitations of the even-even (160)Gd nucleus in the spectroscopic region

Abstract

In this study, the result of calculations using rotational, translational and Galilean invariant quasiparticle random-phase approximation is presented for the low-lying dipole excitations in the even-even (160)Gd nucleus. Calculations are carried out for both Delta K = 1 and Delta K = 0 branches. The analysis shows that the main part of spin-1 states, observed at energy 2.4-4 MeV in (160)Gd, have M1 character and are interpreted as main fragments of the scissors mode. The calculations indicate the presence of a few prominent negative-parity dipole Delta K = 1 states in the investigated energy region, in agreement with experiment.