Low-lying isomeric states in Ta-169

YH Zhang,QZ Zhao,SF Zhu,HS Xu,XH Zhou,YX Guo,XG Lei,J Lu,QB Gou,HJ Jin, Z Liu,YX Luo,XF Sun,YT Zhu

EUROPEAN PHYSICAL JOURNAL A（1998）

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Abstract

Two low-lying isomeric states in Ta-169 have been identified via Tb-159(O-16,6n gamma)Ta-169 reaction. Their half-lives are measured to be 28 +/- 5 ns for the 9/2(-) level and 17 +/- 4 ns for the 5/2(-) level by using the delayed gamma-gamma coincidence method. These two isomeric states are considered to be the bandheads with 9/2(-)[514] and 1/2(-)[541] configurations respectively.

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