Half-life of the 15/2+ state of 135I: A test of E2 seniority relations

Pietro Spagnoletti, G. S. Simpson, Robert Carroll, J. -M. Regis, A. Blanc, M. Jentschel, U. Koester, P. Mutti, T. Soldner, G. de France, C. Ur, W. Urban, A. Bruce, F. Drouet, L. M. Fraile, L. P. Gaffney, D.G. Ghita, S. Ilieva, J Jolie, W. KortenTh. Kroell, C. Larijarni, S. Lalkovski, R. Lica, H. Mach, N. Marginean, V. Paziy, Zs. Podolyak, P. H. Regan, Marcus Scheck, N. Saed-Samii, G. Thiamova, C. Townsley, A. Vancraeyenest, V. Vedia, A. Gargano, P. Van Isacker

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The 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.
Original languageEnglish
Article number021302(R)
JournalPhysical Review C
Publication statusPublished - 15 Feb 2017


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