Shape coexistence at high spin in the N = Z+2 nucleus Se-70

ISSN
0954-3899
Date Issued
2002
Author(s)
Rainovski, G.
Schnare, H.
Schwengner, R.
Plettner, C.
Käubler, L.
Donau, F.
Ragnarsson, I.
Eberth, J.
Steinhardt, T.
Thelen, O.
Hausmann, M.
Jungclaus, A.
Lieb, Klaus-Peter
de Angelis, G.
Gadea, A.
Napoli, D. R.
Algora, A.
Jenkins, D. G.
Wadsworth, R.
Wilson, A.
Andrejtscheff, W.
Dimitrov, V. I.
DOI
10.1088/0954-3899/28/10/307
Abstract
The nucleus Se-70 was studied using the Ca-40(Ca-40, 2alpha2p) reaction at a beam energy of 185 MeV. Gamma rays were measured with the EUROBALL III spectrometer. The known positive-parity bands have been extended and one new band of positive parity and two of negative parity have been identified. These bands are interpreted in terms of the cranked Nilsson-Strutinsky approach. Calculations suggest that the two negative-parity bands, which have the same signature, are both based on a configuration with two protons and three neutrons lifted from the fp shell to the g(9/2) orbital, but at different nuclear shapes. This represents a shape coexistence at high spin.