Interplay between single-particle and collective effects in the odd-A Cu isotopes beyond N=40

Summary, in English

Collective properties of the low-lying levels in the odd-A Cu67-73 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 Cu-67,Cu-69, low-lying 1/2(-), 5/2(-), and 7/2(-) states were populated. In Cu-71,Cu-73, 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.

• Author: I Stefanescu; G Georgiev; D L Balabanski; N Blasi; A Blazhev; N Bree; Joakim Cederkäll; T E Cocolios; T Davinson; J Diriken; J Eberth; Andreas Ekström; D Fedorov; V N Fedosseev; L M Fraile; S Franchoo; K Gladnishki; M Huyse; O Ivanov; V Ivanov; J Iwanicki; J Jolie; T Konstantinopoulos; Th Kroell; R Kruecken; U Koester; A Lagoyannis; G Lo Bianco; P Maierbeck; B A Marsh; P Napiorkowski; N Patronis; D Pauwels; G Rainovski; P Reiter; K Riisager; M Seliverstov; G Sletten; J Van de Walle; P Van Duppen; D Voulot; N Warr; F Wenander; K Wrzosek
• Department/s: Nuclear physics
• Publishing year: 2008
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 100
• Issue: 11
• Links: http://dx.doi.org/10.1103/PhysRevLett.100.112502
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1079-7114