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Coulomb Excitation of 68,70Cu: First Use of Postaccelerated Isomeric Beams

I. Stefanescu ; G. Georgiev ; F. Ames ; J. Aysto ; D. L. Balabanski ; G. Bollen ; P. A. Butler ; J. Cederkall ; N. Champault ; T. Davinson ; A. De Maesschalck ; P. Delahaye ; J. Eberth ; D. Fedorov ; V. N. Fedosseev ; L. M. Fraile ; S. Franchoo ; K. Gladnishki ; D. Habs ; K. Heyde ; M. Huyse ; O. Ivanov ; J. Iwanicki ; J. Jolie ; Björn Jonson (Institutionen för fundamental fysik, Subatomär fysik) ; Th Kroll ; R. Krucken ; O. Kester ; U. Koster ; A. Lagoyannis ; L. Liljeby ; G. Lo Bianco ; B. A. Marsh ; O. Niedermaier ; Thomas Nilsson (Institutionen för fundamental fysik, Subatomär fysik) ; M. Oinonen ; G. Pascovici ; P. Reiter ; A. Saltarelli ; H. Scheit ; D. Schwalm ; T. Sieber ; N. Smirnova ; J. Van De Walle ; P. Van Duppen ; S. Zemlyanoi ; N. Warr ; D. Weisshaar ; F. Wenander
Physical Review Letters Vol. 98 (2007), 12, p. 122701-4.
[Artikel, refereegranskad vetenskaplig]

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 pi2p3/2nu1g9/2 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[approximate]40.

Nyckelord: isomer Coulomb excitation REX-ISOLDE post-accelerator

Denna post skapades 2007-03-27. Senast ändrad 2014-09-02.
CPL Pubid: 40047


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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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