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

TL;DR

This paper explains the behavior of transition probabilities in high-spin Sn-isomers using generalized seniority and quasi-spin schemes, revealing the occurrence of seniority isomers decaying via odd-tensor E1 transitions.

Contribution

It introduces a unified explanation for E1 and E2 transition behaviors in Sn-isomers using generalized seniority, and reports the first observation of seniority isomers decaying through E1 transitions.

Findings

Successful explanation of measured transition probabilities and half-lives.

Identification of seniority isomers in 13- Sn-isomers.

First demonstration of seniority isomers decaying via odd-tensor E1 transitions.

Abstract

The similar behavior of the B(E1) values of the recently observed 13- odd tensor E1 isomers and the B(E2) values of the 10+ and 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- Sn-isomers, which decay by odd-tensor E1 transitions to the same seniority states.