Sign of the g factor of the 41+ state in Zn68

Abstract

In two recent papers a negative g factor was reported for the 41+ state in Zn68. The negative sign is unexpected. It is not consistent with the systematics of g factors in the neighboring Zn and Ge isotopes and could not be explained by shell-model calculations even when significant contributions of the 0g9/2 neutrons were included. Therefore, an independent g factor measurement was performed, using Zn68 projectiles which were accelerated to a higher energy in order to obtain a higher yield for the 41+ state. The new measurement yielded a positive g factor, g(41+)=+0.6(3), which agrees with the results of full fp spherical shell model calculations, as well as with Z/A, the collective model prediction. Show more