https://doi.org/10.1140/epja/i2004-10126-5
Observation of negative-parity high-spin states of 68As
1
II. Physikalisches Institut, Universität Göttingen, 37073, Göttingen, Germany
2
Institute for Nuclear Research and Nuclear Energy, BAS, 1784, Sofia, Bulgaria
3
Institut für Kernphysik, Universität zu Köln, 50937, Köln, Germany
4
Horia-Hulubei National Institute for Physics and Nuclear Engineering, P.O. Box MG-6, Bucharest, Romania
5
Laboratori Nazionali di Legnaro, INFN, 35020, Legnaro (Padova), Italy
6
Institut de Recherches Subatomiques, CNRS-IN2P3, 67037, Strasbourg, France
7
Sezione di Padova, INFN, Padova, Italy
8
Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, 28006, Madrid, Spain
9
Departamento de Fisica Teórica, Universidad Autónoma de Madrid, 28049, Madrid, Spain
10
Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314, Dresden, Germany
11
Department of Physics, Royal Institute of Technology, 10405, Stockholm, Sweden
Received:
2
December
2004
Accepted:
14
January
2005
Published online:
21
January
2005
The neutron-deficient nucleus 68As was populated at high spin in two experiments using the reaction 40Ca(32S, 3pn) at beam energies of 105 and 95 MeV. A self-supporting and a gold-backed, highly enriched 40Ca target were used. Gamma rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The 68As level scheme was considerably extended, especially at negative parity and many previous spin-parity assignments were confirmed or rejected. The total-Routhian-surface (TRS) calculations find shape coexistence and γ softness for the negative- and positive-parity states, respectively.
PACS: 23.20.Lv γ transitions and level energies – / 21.60.-n Nuclear structure models and methods –
© Società Italiana di Fisica and Springer-Verlag, 2005