The nuclear structure of 24Na and some remarks on the nuclear structure of 25Mg

Abstract

The experimental data on the 23Na(d, p)24Na reaction at Ed = 7.8 MeV reported in a previous paper 1) (referred to as I) are used for a tentative interpretation of the even parity levels of 24Na at low excitation. Comparison with the interpretation of the nuclear structure of 25Mg leads to assignment of rotational bands in 24Na (table 5 and fig. 6). The spectroscopic data of the (d, p) reaction on 23Na and 24Mg and the position of the intrinsic states of the rotational bands in 24Na and 25Mg yield a reasonable fit to the unified model for [beta] [approximate] 0.2 at [kappa] = 0.08, to be contrasted with a value of [beta] [approximate] 0.4 to 0.5 at [kappa] = 0.08 deduced from the magnetic moment, the total energy of the nucleus in the Nilsson model and the quadrupole moments of nuclei in this region. The rotation-particle coupling distorts the rotational structure of 24Na and 25Mg considerably. The unified model alone and this model including a residual central two-body interaction between the two odd nucleons predict a ground state spin 1+ instead of 4+ for 24Na. Taking into account a two-body spin-orbit force and a tensor force may yield a correct prediction of the ground state spin.