Odd tensor electric transitions in high-spin Sn-isomers and generalized seniority

The similar behavior of the B(E1)B(E1) values of the recently observed 13−13− odd tensor E  1 isomers and the B(E2)B(E2) values of the 10+10+ and 15−15− even tensor E2 isomers in the Sn-isotopes has been understood in terms of the generalized seniority for multi-j   orbits by using the quasi-spin scheme. This simple approach proves to be quite successful in explaining the measured transition probabilities and the corresponding half-lives in the high-spin isomers of the semi-magic Sn-isotopes. Hence, we show for the first time the occurrence of seniority isomers in the 13−13− Sn-isomers, which decay by odd-tensor E1 transitions to the same seniority states.