Study of subshell closure at N=40 by Coulomb excitation

Citation
S. Leenhardt et al., Study of subshell closure at N=40 by Coulomb excitation, NUOV CIM A, 111(6-7), 1998, pp. 733-738
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS
ISSN journal
1124-1861 → ACNP
Volume
111
Issue
6-7
Year of publication
1998
Pages
733 - 738
Database
ISI
SICI code
1124-1861(199806/07)111:6-7<733:SOSCAN>2.0.ZU;2-1
Abstract
A Coulomb excitation experiment has been performed in order to study the su bshell closure at N = 40 for neutron-rich nuclei. This subshell effect is t hought to be enhanced when large N/Z ratios are encountered. Therefore, the Z = 28 Ni-68 is of particular interest in order to test this behaviour. So me experimental information is already available for Ni-68 at low excitatio n energy: a 0(2)(+) isomer; a 2(+) state and a long-lived 5(-) state. The h igh energy of the 2(+) state suggests the shell closure though its reduced transition probability B(E2) has never been measured. The nuclei Ni-68, Zn- 70,Zn-72, Ge-76 have been produced in the fragmentation of a Kr-86 beam at 60 MeV/A. The selection of these secondary beams has been performed by LISE 3 spectrometer at GANIL. Performances of the detector system "Chateau de Cr istal" and preliminary results on reduced transition probabilities B(E2) ar e presented and discussed.