Sign of the g factor of the 4{sub 1}{sup +} state in {sup 68}Zn
2007
In two recent papers a negative g factor was reported for the 4{sub 1}{sup +} state in {sup 68}Zn. 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 0g{sub 9/2} neutrons were included. Therefore, an independent g factor measurement was performed, using {sup 68}Zn projectiles which were accelerated to a higher energy in order to obtain a higher yield for the 4{sub 1}{sup +} state. The new measurement yielded a positive g factor, g(4{sub 1}{sup +})=+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.
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