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New region of deformation in the neutron-rich 60 24Cr36 and 62 24Cr38 |
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| Authors: | O. Sorlin C. Donzaud F. Nowacki J.C. Angélique F. Azaiez C. Bourgeois V. Chiste Z. Dlouhy S. Grévy D. Guillemaud-Mueller F. Ibrahim K.-L Kratz M. Lewitowicz S.M. Lukyanov J. Mrasek Yu.-E. Penionzhkevich F. de Oliveira Santos B. Pfeiffer F. Pougheon A. Poves M.G. Saint-Laurent M. Stanoiu |
| Affiliation: | Institut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, France, FR IReS, IN2P3-CNRS, Université Louis Pasteur, BP 28, F-67037 Strasbourg Cedex, France, FR LPC, ISMRA, F-14050 Caen Cedex, France, FR Nuclear Physics Institute, AS CR, CZ 25068, Rez, Czech Republic, CZ Institut für Kernchemie, Universit?t Mainz, D-55128 Mainz, Germany, DE GANIL, B. P. 5027, F-14076 Caen Cedex, France, FR FLNR, JINR, 141980 Dubna, Moscow region, Russia, RU Departamento de Fisica Teorica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain, ES |
| Abstract: | The neutron-rich nuclei 23 60-63V have been produced at GANIL via interactions of a 61.8A·MeV 76Ge beam with a 58Ni target. Beta-decay to 24 60-63Cr has been investigated using combined β- and γ-ray spectroscopy. Half-lives of the 60-63V nuclei have been determined, and the existence of a beta-decay isomer in the 60V nucleus is strongly supported. The observation of low-energy 2+ states in 60Cr (646keV) and 62Cr (446keV) suggests that these isotopes are strongly deformed with β2 ∼ 0.3. This is confirmed by shell model calculations which show the dominant influence of the intruder g and d orbitals to obtain low 2+ energies in the neutron-rich Cr isotopes. Received: 13 June 2002 / Accepted: 27 August 2002 / Published online: 17 January 2003 RID="a" ID="a"e-mail: sorlin@ipno.in2p3.fr Communicated by D. Guerreau |
| Keywords: | PACS. 27.50.+e 59 ⩽ A ⩽ 89 – 23.40.-s Beta decay double beta decay electron and muon capture – 21.60.Cs Shell model – 21.60.-n Nuclear-structure models and methods |
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