Evolution of the N=82 shell gap below 132Sn inferred from core excited states in 131In

M. Górska, L. Cáceres, H. Grawe, M. Pfützner, A. Jungclaus, S. Pietri, E. Werner-Malento, Z. Podolyák, P.H. Regan, D. Rudolph, P. Detistov, S. Lalkovski, V. Modamio, J. Walker, T. Beck, P. Bednarczyk, P. Doornenbal, H. Geissel, J. Gerl, J. GrëboszR. Hoischen, I. Kojouharov, N. Kurz, W. Prokopowicz, H. Schaffner, H. Weick, H.J. Wollersheim, K. Andgren, J. Benlliure, G. Benzoni, Alison Bruce, E. Casarejos, B. Cederwall, F.C.L. Crespi, B. Hadinia, M. Hellström, G. Ilie, A. Khaplanov, M. Kmiecik, R. Kumar, A. Maj, S. Mandal, F. Montes, S. Myalski, G.S. Simpson, S.J. Steer, S. Tashenov, O. Wieland, Zs. Dombrádi, P. Reiter

Research output: Contribution to journalArticlepeer-review


The γ-ray decay of an excited state in 131In, the one proton hole neighbor of the doubly magic 132Sn has been measured. A high-spin, core-excited isomer with T1/2=630(60) ns was identified following production by both relativistic fragmentation of a 136Xe beam and fission of a 238U beam. This state deexcites by a single γ-ray branch of 3782(2) keV from which direct evidence for the size of the N=82 shell gap is inferred. The results are discussed in comparison to a shell-model calculation including configurations across the closed shells at N=82 and Z=50.
Original languageEnglish
Pages (from-to)313-316
Number of pages4
JournalPhysics Letters B
Issue number4-5
Publication statusPublished - Mar 2009


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