Shape Coexistence at High Spin in the N = Z + 2 Nucleus 70Se
Shape Coexistence at High Spin in the N = Z + 2 Nucleus 70Se
Rainovski, G.; Schnare, H.; Schwengner, R.; Plettner, C.; Käubler, L.; Dönau, F.; Ragnarsson, I.; Eberth, J.; Steinhardt, T.; Thelen, O.; Hausmann, M.; Jungclaus, A.; Lieb, K. P.; Müller, A.; de Angelis, G.; Gadea, A.; Napoli, D. R.; Algora, A.; Jenkins, D. G.; Wadsworth, R.; Wilson, A.; Andrejtscheff, W.; Dimitrov, V. I.
The nucleus 70Se was studied using the 40Ca(40Ca, 2α) 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.
- J. Phys. G: Nucl. Part. Phys. 28 (2002) 2617-2625
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