Observation of negative-parity high-spin states of 68As

Observation of negative-parity high-spin states of 68As

Stefanova, E. A.; Lieb, K. P.; Stefanescu, I.; 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.

The neutron-deficient nucleus 68AS was populated at high spin in two experiments using the reaction 40Ca(32S, 3pn) at beam energies of 105 and 95 MeV. A self-supporting and a gold backed, highly enriched 40Ca target were used. Gamma rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The 68As level scheme was considerably extended, especially at negative parity and many previous spin-parity assignments were confirmed or rejected. The total-Routhian-surface (TRS) calculation find shape coexistence and γ softness for the negative- and positive-parity states, respectively

  • European Physical Journal A 24(2005), 1-4

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