Interplay between Single-Particle and Collective Effects in the Odd-A Cu Isotopes beyond N=40

Journal Article · Fri Mar 21 00:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.112502· OSTI ID:21123763

Stefanescu, I ^[1]; Georgiev, G ^[2]; Balabanski, D L ^[3]; Blasi, N; Lo Bianco, G ^[3]; Blazhev, A; Eberth, J; Jolie, J; Reiter, P; Warr, N ^[4]; Bree, N; Cocolios, T E; Diriken, J; Huyse, M; Ivanov, O; Patronis, N; Pauwels, D; Van Duppen, P ^[1]; Cederkaell, J ^[5]; Davinson, T ^[6]

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1. Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven (Belgium)
2. CSNSM, CNRS/IN2P3, Universite Paris-Sud, UMR8609, F-91405 ORSAY (France)
3. Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino (Italy)
4. IKP, University of Cologne, D-50937 Cologne (Germany)
5. ISOLDE, CERN, CH-1211 Geneva 23 (Switzerland)
6. Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)

Collective properties of the low-lying levels in the odd-A {sup 67-73}Cu were investigated by Coulomb excitation with radioactive beams. The beams were produced at ISOLDE and postaccelerated by REX-ISOLDE up to 2.99 MeV/u. In {sup 67,69}Cu, low-lying 1/2{sup -}, 5/2{sup -}, and 7/2{sup -} states were populated. In {sup 71,73}Cu, besides the known transitions deexciting the single-particle-like 5/2{sup -} and core-coupled 7/2{sup -} levels, {gamma} rays of 454 and 135 keV, respectively, were observed for the first time. Based on a reanalysis of {beta}-decay work and comparison with the systematics, a spin 1/2{sup -} is suggested for these excited states. Three B(E2) values were determined in each of the four isotopes. The results indicate a significant change in the structure of the odd-A Cu isotopes beyond N=40 where single-particle-like and collective levels are suggested to coexist at very low excitation energies.

• OSTI ID: 21123763
• Journal Information: Physical Review Letters, Vol. 100, Issue 11; Other Information: DOI: 10.1103/PhysRevLett.100.112502; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
COPPER 67
COPPER 69
COPPER 71
COPPER 73
COULOMB EXCITATION
EXCITED STATES
GAMMA RADIATION
KEV RANGE 100-1000
MEV RANGE 01-10
SPIN