13 de julho de 2017 | Estruturas Nucleares e Reações, Publicações
SOUZA, M. A., MIYAKE, H.
THE EUROPEAN PHYSICAL JOURNAL A
13/07/2017
Abstract
The α + core structure is investigated in even-even Cr isotopes from the viewpoint of the local potential model. The comparison of Qα/A values for even-even Cr isotopes and even-even A=46,54,56,58 isobars indicates that46Cr and54Cr are the most favorable even-even Cr isotopes for the α + core configuration. The ground state bands of the two Cr isotopes are calculated through a local α + core potential containing a nuclear term with (1 + Gaussian) × (W.S. + W.S.3) shape. The calculated spectra give a very good description of most experimental46Cr and54Cr levels, including the 0+ bandheads. The reduced α -widths, rms intercluster separations and B(E2) transition rates are determined for the ground state bands. The calculations reproduce the order of magnitude of the available experimental B(E2) values without using effective charges, indicate that the low-spin members of the ground state bands present a stronger α -cluster character, and point out that the46Cr ground state band has a significant degree of α -clustering in comparison with44Ti . The volume integral per nucleon pair and rms radius obtained for the α +50Ti potential are consistent with those reported previously in the analysis of α elastic scattering on50Ti.