Observation of negative-parity high-spin states of As-68
Stefanova, EA × Lieb, KP Stefanescu, Irina De Angelis, G Curien, D Eberth, J Farnea, E Gadea, A Gersch, G Jungclaus, A Martinez, T Schwengner, R Steinhardt, T Warr, N Weisshaar, D Wyss, R #
European Physical Journal A vol:24 issue:1 pages:1-4
The neutron-deficient nucleus As-68 was populated at high spin in two experiments using the reaction Ca-40(S-32, 3pn) at beam energies of 105 and 95 MeV. A self-supporting and a gold-backed, highly enriched Ca-40 target were used. Gamma rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The As-68 level scheme was considerably extended, especially at negative parity and many previous spin-parity assignments were confirmed or rejected. The total-Routhian-surface (TRS) calculations find shape coexistence and γ softness for the negative- and positive-parity states, respectively.