The possible existence of rotational levels in Al 28

Abstract

The nine lowest levels in Al 28 are interpreted as belonging to 4 rotational bands which in turn arise from two nuclear configurations. Experimental evidence from the beta decay of Mg 28 and from the (d, p) stripping reaction on Al 27, including the spins, parities and energies of levels, the calculated moments of inertia of the bands, and the relative intensities of the beta and gamma transitions, is shown to be in excellent agreement with the interpretation. The nuclear configurations are shown to be consistent with experimental evidence and to arise naturally from the S. G. Nilsson levels for deformed nuclei. General trends in deformation in the low A region are discussed. A comparison is made between the moments of inertia of even-even, odd mass, odd-odd nuclei, and the corresponding calculated rigid moments of inertia.