Physics Letters B (Sep 2016)
The mutable nature of particle-core excitations with spin in the one-valence-proton nucleus 133Sb
- G. Bocchi,
- S. Leoni,
- B. Fornal,
- G. Colò,
- P.F. Bortignon,
- S. Bottoni,
- A. Bracco,
- C. Michelagnoli,
- D. Bazzacco,
- A. Blanc,
- G. de France,
- M. Jentschel,
- U. Köster,
- P. Mutti,
- J.-M. Régis,
- G. Simpson,
- T. Soldner,
- C.A. Ur,
- W. Urban,
- L.M. Fraile,
- R. Lozeva,
- B. Belvito,
- G. Benzoni,
- A. Bruce,
- R. Carroll,
- N. Cieplicka-Oryǹczak,
- F.C.L. Crespi,
- F. Didierjean,
- J. Jolie,
- W. Korten,
- T. Kröll,
- S. Lalkovski,
- H. Mach,
- N. Mărginean,
- B. Melon,
- D. Mengoni,
- B. Million,
- A. Nannini,
- D. Napoli,
- B. Olaizola,
- V. Paziy,
- Zs. Podolyák,
- P.H. Regan,
- N. Saed-Samii,
- B. Szpak,
- V. Vedia
Affiliations
- G. Bocchi
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- S. Leoni
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- B. Fornal
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
- G. Colò
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- P.F. Bortignon
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- S. Bottoni
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- A. Bracco
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- C. Michelagnoli
- GANIL, BP 55027, 14076 Caen CEDEX 5, France
- D. Bazzacco
- INFN Sezione di Padova, I-35131 Padova, Italy
- A. Blanc
- Institut Laue-Langevin, 6, rue Jules Horowitz, 38042 Grenoble CEDEX 9, France
- G. de France
- GANIL, BP 55027, 14076 Caen CEDEX 5, France
- M. Jentschel
- Institut Laue-Langevin, 6, rue Jules Horowitz, 38042 Grenoble CEDEX 9, France
- U. Köster
- Institut Laue-Langevin, 6, rue Jules Horowitz, 38042 Grenoble CEDEX 9, France
- P. Mutti
- Institut Laue-Langevin, 6, rue Jules Horowitz, 38042 Grenoble CEDEX 9, France
- J.-M. Régis
- IKP, University of Cologne, Zülpicher Str. 77, D-50937 Köln, Germany
- G. Simpson
- LPSC, 53 Avenue des Martyrs, F-38026 Grenoble, France
- T. Soldner
- Institut Laue-Langevin, 6, rue Jules Horowitz, 38042 Grenoble CEDEX 9, France
- C.A. Ur
- INFN Sezione di Padova, I-35131 Padova, Italy
- W. Urban
- Faculty of Physics, Warsaw Univ., ul. Hoza 69, PL-00-681 Warsaw, Poland
- L.M. Fraile
- Grupo de Física Nuclear, Universidad Complutense, CEI Moncloa, 28040 Madrid, Spain
- R. Lozeva
- IPHC, CNRS/IN2P3 and University of Strasbourg, F-67037 Strasbourg, France
- B. Belvito
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- G. Benzoni
- INFN Sezione di Milano, via Celoria 16, 20133, Milano, Italy
- A. Bruce
- SCEM, University of Brighton, Lewes Road, Brighton BN2 4GJ, UK
- R. Carroll
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- N. Cieplicka-Oryǹczak
- INFN Sezione di Milano, via Celoria 16, 20133, Milano, Italy
- F.C.L. Crespi
- Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
- F. Didierjean
- IPHC, CNRS/IN2P3 and University of Strasbourg, F-67037 Strasbourg, France
- J. Jolie
- IKP, University of Cologne, Zülpicher Str. 77, D-50937 Köln, Germany
- W. Korten
- CEA, Centre de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
- T. Kröll
- Institut für Kernphysik, TU Darmstadt, Schlossgartenstrasse 9, 64289 Darmstadt, Germany
- S. Lalkovski
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- H. Mach
- Grupo de Física Nuclear, Universidad Complutense, CEI Moncloa, 28040 Madrid, Spain
- N. Mărginean
- Horia Hulubei National Institute of Physics and Nuclear Engineering – IFIN HH, Bucharest, 077125, Romania
- B. Melon
- INFN Sezione di Firenze, Firenze, Italy
- D. Mengoni
- INFN Sezione di Padova, I-35131 Padova, Italy
- B. Million
- INFN Sezione di Milano, via Celoria 16, 20133, Milano, Italy
- A. Nannini
- INFN Sezione di Firenze, Firenze, Italy
- D. Napoli
- INFN, Laboratori Nazionali di Legnaro, I-35020 Padova, Italy
- B. Olaizola
- Grupo de Física Nuclear, Universidad Complutense, CEI Moncloa, 28040 Madrid, Spain
- V. Paziy
- Grupo de Física Nuclear, Universidad Complutense, CEI Moncloa, 28040 Madrid, Spain
- Zs. Podolyák
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- P.H. Regan
- Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
- N. Saed-Samii
- IKP, University of Cologne, Zülpicher Str. 77, D-50937 Köln, Germany
- B. Szpak
- Institute of Nuclear Physics, PAN, 31-342 Kraków, Poland
- V. Vedia
- Grupo de Física Nuclear, Universidad Complutense, CEI Moncloa, 28040 Madrid, Spain
- DOI
- https://doi.org/10.1016/j.physletb.2016.06.065
- Journal volume & issue
-
Vol. 760,
no. C
pp. 273 – 278
Abstract
The γ-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 γ-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 μs isomer. Lifetimes analysis, performed by fast-timing techniques with LaBr3(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 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.
Keywords
- Neutron induced fission
- Gamma spectroscopy
- Nuclear state lifetime
- Large Ge array
- Particle-core couplings
