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16 April 2024

» arxiv » 1603.8056

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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 ;
Date:	26 Mar 2016
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.
Source:	arXiv, 1603.8056
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