Coulomb excitation of 68,70Cu: first use of postaccelerated isomeric beams |
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| Authors: | Stefanescu I Georgiev G Ames F Aystö J Balabanski D L Bollen G Butler P A Cederkäll J Champault N Davinson T De Maesschalck A Delahaye P Eberth J Fedorov D Fedosseev V N Fraile L M Franchoo S Gladnishki K Habs D Heyde K Huyse M Ivanov O Iwanicki J Jolie J Jonson B Kröll Th Krücken R Kester O Köster U Lagoyannis A Liljeby L Lo Bianco G Marsh B A Niedermaier O Nilsson T Oinonen M Pascovici G Reiter P Saltarelli A Scheit H Schwalm D Sieber T Smirnova N Van De Walle J Van Duppen P Zemlyanoi S Warr N Weisshaar D Wenander F |
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| Institution: | Instituut voor Kern- en Stralingsfysica, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium. |
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| Abstract: | We report on the first low-energy Coulomb excitation measurements with radioactive Ipi=6- beams of odd-odd nuclei 68,70Cu. The beams were produced at ISOLDE, CERN and were post-accelerated by REX-ISOLDE to 2.83 MeV/nucleon. Gamma rays were detected with the MINIBALL spectrometer. The 6- beam was used to study the multiplet of states (3-, 4-, 5-, 6-) arising from the pi2p3/2 nu 1g9/2 configuration. The 4- state of the multiplet was populated via Coulomb excitation and the B(E2;6--->4-) value was determined in both nuclei. The results obtained illustrate the fragile stability of the Z=28 shell and N=40 subshell closures. A comparison with large-scale shell-model calculations using the 56Ni core shows the importance of the proton excitations across the Z=28 shell gap to the understanding of the nuclear structure in the neutron-rich nuclei with N approximately 40. |
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