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arXiv · 1603.08056

The mutable nature of particle-core excitations with spin in the one-valence-proton nucleus 133Sb

G. Bocchi·S. Leoni·B. Fornal·G. Colo'·P. F. Bortignon·S. Bottoni·A. Bracco·C. Michelagnoli·D. Bazzacco·A. Blanc·G. De France·M. Jentschel·U. Koster·P. Mutti·J. -M. Regis·G. Simpson·T. Soldner·C. A. Ur·W. Urban·L. M. Fraile·R. Lozeva·B. Belvito·G. Benzoni·A. Bruce·R. Carroll·N. Cieplicka-Orynczak·F. C. L. Crespi·F. Didierjean·J. Jolie·W. Korten·T. Kroll·S. Lalkovski·H. Mach·N. Marginean·B. Melon·D. Mengoni·B. Million·A. Nannini·D. Napoli·B. Olaizola·V. Paziy·Zs. Podolyakn·P. H. Regann·N. Saed-Samii·B. Szpak·V. Vedia
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Abstract

The gamma-ray decay of excited states of the one-valence-proton nucleus 133Sb has been studied using cold-neutron induced fission of 235U and 241Pu targets, during the EXILL campaign at the ILL reactor in Grenoble. By using a highly efficient HPGe array, coincidences between gamma-rays prompt with the fission event and those delayed up to several tens of microseconds were investigated, allowing to observe, for the first time, high-spin excited states above the 16.6 micros isomer. Lifetimes analysis, performed by fast-timing techniques with LaBr3(Ce) scintillators, reveals a difference of almost two orders of magnitude in B(M1) strength for transitions between positive-parity medium-spin yrast states. The data are interpreted by a newly developed microscopic model which takes into account couplings between core excitations (both collective and non-collective) of the doubly magic nucleus 132Sn and the valence proton, using the Skyrme effective interaction in a consistent way. The results point to a fast change in the nature of particle-core excitations with increasing spin.

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G. Bocchi, S. Leoni, B. Fornal, G. Colo', P. F. Bortignon, S. Bottoni, A. Bracco, C. Michelagnoli, D. Bazzacco, A. Blanc, G. De France, M. Jentschel, U. Koster, P. Mutti, J. -M. Regis, G. Simpson, T. Soldner, C. A. Ur, W. Urban, L. M. Fraile, R. Lozeva, B. Belvito, G. Benzoni, A. Bruce, R. Carroll, N. Cieplicka-Orynczak, F. C. L. Crespi, F. Didierjean, J. Jolie, W. Korten, T. Kroll, S. Lalkovski, H. Mach, N. Marginean, B. Melon, D. Mengoni, B. Million, A. Nannini, D. Napoli, B. Olaizola, V. Paziy, Zs. Podolyakn, P. H. Regann, N. Saed-Samii, B. Szpak, V. Vedia. 2016-03-25. The mutable nature of particle-core excitations with spin in the one-valence-proton nucleus 133Sb. https://doi.org/10.1016/j.physletb.2016.06.065

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