Isomeric Transitions of (211M)Po and (212M)Po and E4 Effective Charge

摘要

The branching ratios of isomeric transitions from high-spin alpha -decaying isomers in /sup 211/Po and /sup 212/Po have been measured for the first time to be 0.016 +- 0.004 % and 0.07 +- 0.02 %, respectively. The result gives the first clear experimental evidence for that the isomeric transition in /sup 211m/Po takes place via E4 with an effective charge of about 1.8 e, confirming J/sup pi / = 25/2/sup +/ assignment for /sup 211m/Po. The E4 character of the isomeric transition in /sup 212m/Po has also been confirmed. (ERA citation 14:023623)