EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 16, 55-61 (2003)
DOI: 10.1140/epja/i2002-10069-9

New region of deformation in the neutron-rich $\chem{{}^{60}_{24}Cr_{36}}$ and $\chem{{}^{62}_{24}Cr_{38}}$

O. Sorlin1, C. Donzaud1, F. Nowacki2, J.C. Angélique3, F. Azaiez1, C. Bourgeois1, V. Chiste1, Z. Dlouhy4, S. Grévy3, D. Guillemaud-Mueller1, F. Ibrahim1, K.-L Kratz5, M. Lewitowicz6, S.M. Lukyanov7, J. Mrasek4, Yu.-E. Penionzhkevich7, F. de Oliveira Santos6, B. Pfeiffer5, F. Pougheon1, A. Poves8, M.G. Saint-Laurent6 and M. Stanoiu6

1  Institut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, France
2  IReS, IN2P3-CNRS, Université Louis Pasteur, BP 28, F-67037 Strasbourg Cedex, France
3  LPC, ISMRA, F-14050 Caen Cedex, France
4  Nuclear Physics Institute, AS CR, CZ 25068, Rez, Czech Republic
5  Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
6  GANIL, B. P. 5027, F-14076 Caen Cedex, France
7  FLNR, JINR, 141980 Dubna, Moscow region, Russia
8  Departamento de Fisica Teorica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain

sorlin@ipno.in2p3.fr

(Received: 13 June 2002 / Published online: 17 January 2003)

Abstract
The neutron-rich nuclei $\chem{{}_{23}^{60\tx{-}63}V}$ have been produced at GANIL via interactions of a 61.8 A.MeV $\chem{{}^{76}Ge}$ beam with a $\chem{{}^{58}Ni}$ target. Beta-decay to $\chem{{}_{24}^{60\tx{-}63}Cr}$ has been investigated using combined $\beta$- and $\gamma$-ray spectroscopy. Half-lives of the $\chem{{}^{60\tx{-}63}V}$ nuclei have been determined, and the existence of a beta-decay isomer in the $\chem{{}^{60}V}$ nucleus is strongly supported. The observation of low-energy 2+ states in $\chem{{}^{60}Cr}$ (646 keV) and $\chem{{}^{62}Cr}$ (446 keV) suggests that these isotopes are strongly deformed with $\beta_2\sim 0.3$. 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 $\chem{Cr}$ isotopes.

PACS
27.50.+e - $59\leq A\leq 89$ .
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.

© Società Italiana di Fisica, Springer-Verlag 2003

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