Evolution of the N=82 shell gap below <sup>132</sup>Sn inferred from core excited states in <sup>131</sup>In
- Górska, M.
- Cáceres, L.
- Grawe, H.
- Pfützner, M.
- Jungclaus, A.
- Pietri, S.
- Werner-Malento, E.
- Podolyák, Z.
- Regan, P.H.
- Rudolph, D.
- Detistov, P.
- Lalkovski, S.
- Modamio, V.
- Walker, J.
- Beck, T.
- Bednarczyk, P.
- Doornenbal, P.
- Geissel, H.
- Gerl, J.
- Grëbosz, J.
- Hoischen, R.
- Kojouharov, I.
- Kurz, N.
- Prokopowicz, W.
- Schaffner, H.
- Weick, H.
- Wollersheim, H.J.
- Andgren, K.
- Benlliure, J.
- Benzoni, G.
- Bruce, Alison
- Casarejos, E.
- Cederwall, B.
- Crespi, F.C.L.
- Hadinia, B.
- Hellström, M.
- Ilie, G.
- Khaplanov, A.
- Kmiecik, M.
- Kumar, R.
- Maj, A.
- Mandal, S.
- Montes, F.
- Myalski, S.
- Simpson, G.S.
- Steer, S.J.
- Tashenov, S.
- Wieland, O.
- Dombrádi, Zs.
- Reiter, P.
Publication date
March 2009
DOIAbstract
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
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