Monopole migration in Cu-69,Cu-71,Cu-73 observed from beta decay of laser-ionized Ni68-74 - art. no. 054308

Citation
S. Franchoo et al., Monopole migration in Cu-69,Cu-71,Cu-73 observed from beta decay of laser-ionized Ni68-74 - art. no. 054308, PHYS REV C, 6405(5), 2001, pp. 4308
Citations number
43
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C
ISSN journal
0556-2813 → ACNP
Volume
6405
Issue
5
Year of publication
2001
Database
ISI
SICI code
0556-2813(200111)6405:5<4308:MMICOF>2.0.ZU;2-4
Abstract
The neutron-rich isotopes Ni68-74 have been produced at the LISOL facility in the fission of U-238 induced by a 30-MeV proton beam. They have been ext racted selectively through resonant laser ionization and electromagnetic ma ss separation. Production rates have been deduced and deviate from theoreti cal predictions. The beta decay of the isotopes has been investigated by me ans of beta-gamma and gamma-gamma spectroscopy. Half-lives have been determ ined for Ni68-74, and the level scheme has been extended for Cu-69 and newl y established for Cu-71.73. The constructed schemes show an unexpected and sharp lowering of the pif(5/2) orbital with respect to the pip(3/2) ground state. This feature is ascribed to the monopole term of the residual proton -neutron interaction and is well reproduced by realistic shell-model calcul ations.