Half-life of the 15/2$^+$ state of $^{135}$I : A test of E2 seniority relations
- Spagnoletti, P.
- Simpson, G.S.
- Carroll, R.
- Régis, M.
- Blanc, A.
- Jentschel, M.
- Köster, U.
- Mutti, P.
- Soldner, T.
- De France, G.
- Ur, A.
- Urban, W.
- Bruce, A.
- Drouet, F.
- Fraile, M.
- Gaffney, P.
- Ghită, G.
- Ilieva, S.
- Jolie, J.
- Korten, W.
- Kröll, T.
- Larijarni, C.
- Lalkovski, S.
- Lică, R.
- Mach, H.
- Mărginean, N.
- Paziy, V.
- Podolyák, Zs.
- Regan, P.
- Scheck, M.
- Saed-Samii, N.
- Thiamova, G.
- Townsley, C.
- Vancraeyenest, A.
- Vedia, V.
- Gargano, A.
- Van Isacker, P.
DOIAbstract
International audienceThe half-life of the 15/2+1 state of the 3-valence-proton nucleus 135I has been measured to be 1.74(8) ns using the EXILL-FATIMA mixed array of Ge and LaBr3 detectors. The nuclei were produced following the cold neutron-induced fission of a 235U target at the PF1B beam line of the Institut Laue-Langevin. The extracted B(E2;15/2+→11/2+) value enabled a test of seniority relations for the first time between E2 transition rates. Large-scale shell-model calculations were performed for 134Te and 135I, and reinterpreted in a single-orbit approach. The results show that the two-body component of the E2 operator can be large whereas energy shifts due to the three-body component of the effective interaction are small
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