Evidence for shape coexistence in 120Sn from the first 0+3 lifetime measurement
Abstract
The lifetime of the 0+3 state in 120Sn was measured for the first time applying the fast-timing technique following thermal neutron capture. The mean lifetime of τ = 50(7)~ps leads to a E0 transition strength of 103× 2(E0;0+3→0+2) = 120(50), suggesting shape coexistence and a high degree of mixing between the 0+2 and 0+3 states. With the newly measured lifetime, the B(E2;0+3→ 2+1) value is 0.50(7)~W.u., which reveals that the 2(E0;0+3→0+1) increases by a factor of ≈ 3.4 from 116Sn to 120Sn.
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