1. The mutable nature of particle-core excitations with spin in the one-valence-proton nucleus ¹³³Sb
- Author
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Bocchi, Giovanni, Leoni, Silvia, Fornal, Bogdan, Col��, Gianluca, Bortignon, Pier Francesco, Bottoni, Simone, Bracco, Angela, Michelagnoli, Caterina, Bazzacco, Dino B., Blanc, Aur��lien, France, Gilles de, Jentschel, Michael, K��ster, Ulli, Mutti, Paolo, R��gis, Jean Marc, Simpson, Gary S., Soldner, Torsten, Ur, Calin Alexandru, Urban, Waldemar, Fraile, Luis Mario, Lozeva, Radomira, Belvito, B., Benzoni, Giovanna, Bruce, Alison M., Carroll, R., Cieplicka-Orynczak, Natalia, Crespi, Fabio Celso Luigi, Didierjean, Fran��ois, Jolie, Jan, Korten, Wolfram, Kr��ll, Thorsten, Nannini, Adriana, Napoli, Daniel R., Olaizola, Bruno, Paziy, V., Podoly��k, Zs., Regan, Patrick, Saed-Samii, N., Szpak, Bart��omiej, Lalkovski, Stefan, Mach, Henryk A., M��rginean, Nicolae Marius, Melon, Barbara, Mengoni, Daniele, Million, B��n��dicte, and Vedia, Victoria
- Subjects
Nuclear Theory ,Nuclear Experiment - Abstract
The ��-ray decay of excited states of the one-valence-proton nucleus ������Sb has been studied using cold-neutron induced fission of �������U and �������Pu targets, during the EXILL campaign at the ILL reactor in Grenoble. By using a highly efficient HPGe array, coincidences between ��-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 ��s isomer. Lifetimes analysis, performed by fast-timing techniques with LaBr���(Ce) scintillators, revealed 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 ������Sn 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.
- Published
- 2022