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

Abstract : Collective properties of the low-lying levels in the odd-A 67–73Cu 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 67,69Cu, low-lying 1/2-, 5/2-, and 7/2- states were populated. In 71,73Cu, besides the known transitions deexciting the single-particle-like 5/2- and core-coupled 7/2- 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- 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.
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Submitted on : Tuesday, April 15, 2008 - 4:32:46 PM
Last modification on : Monday, November 16, 2020 - 12:54:04 PM

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I. Stefanescu, G. Georgiev, D. L. Balabanski, N. Blasi, A. Blazhev, et al.. Interplay between Single-Particle and Collective Effects in the Odd-A Cu Isotopes beyond N=40. Physical Review Letters, American Physical Society, 2008, 100, pp.112502. ⟨10.1103/PhysRevLett.100.112502⟩. ⟨in2p3-00273588⟩

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