Low-lying magnetic dipole strength distribution in the gamma-soft even-even Ba130-136

Abstract

In this study the scissors mode 1(+) states are systematically investigated within the rotational invariant Quasiparticle Random Phase Approximation (QRPA) for Ba130-136 isotopes. We consider the 1(+) vibrations generated by the isovector spin-spin interactions and the isoscalar and isovector quadrupole-type separable forces restoring the broken symmetry by a deformed mean field according to A.A. Kuliev et al. (Int. J. Mod. Phys. E 9, 249 (2000)). It has been shown that the restoration of the broken rotational symmetry of the Hamiltonian essentially decreases the B(M1) value of the low-lying 1(+) states and increases the collectivization of the scissors mode excitations in the spectroscopic energy region. The agreement between the calculated mean excitation energies as well as the summed B(M1) value of the scissors mode excitations and the available experimental data of Ba-134 and Ba-136 is rather good. A destructive interference between the orbit and spin part of the M1 strength has been found for barium isotopes near the shell closer. For all the nuclei under investigation, the low-lying M1 transitions have Delta K = 1 character as it is the case for the well-deformed nuclei.