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.
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. Grȩbosz, R. Hoischen, I. Kojouharov, N. Kurz, W. Prokopowicz, H. Schaffner, H. Weick, H.-. Wollersheim, K. Andgren, J. Benlliure, G. Benzoni, A.M. 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, Z. Dombrádi, P. Reiter, D. Sohler. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 672:4-5(2009), pp. 313-316.
Evolution of the N = 82 shell gap below 132Sn inferred from core excited states in 131In
F.C..L. Crespi;
2009
Abstract
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.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
