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.
Original language | English |
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Pages (from-to) | 313-316 |
Number of pages | 4 |
Journal | Physics Letters B |
Volume | 672 |
Issue number | 4-5 |
DOIs | |
Publication status | Published - Mar 2009 |