Two proton high-spin excitations and dipole bands in192Hg

Le Coz, Y. and Redon, N. and Astier, A. and Béraud, R. and Duffait, R. and Meyer, M. and Hannachi, F. and Bastin, G. and Deloncle, I. and Gall, B. and Kaci, M. and Porquet, M.G. and Schück, C. and Azaiez, F. and Bourgeois, C. and Duprat, J. and Korichi, A. and Perrin, N. and Poffé, N. and Sergolle, H. and Sharpey-Schafer, J.F. and Beausang, C.W. and Gale, S.J. and Joyce, M.J. and Paul, E.S. and Clark, R.M. and Hauschild, K. and Wadsworth, R. and Simpson, J. and Bentley, M.A. and Smith, A.G. and Hübel, H. and Willsau, P. and De France, G. and Ahmad, I. and Carpenter, M. and Henry, R. and Janssens, R.V.F. and Khoo, T.L. and Lauritsen, T. (1994) Two proton high-spin excitations and dipole bands in192Hg. Zeitschrift für Physik A Hadrons and Nuclei, 348 (2). pp. 87-93.

Abstract

The192Hg nucleus was populated in the160Gd(36S, 4n) reaction at a beam energy of E=159 MeV. Emittedγ-rays were detected with the EUROGAM array comprising 43 Compton-suppressed large volume Ge detectors. The level scheme of192Hg has been extended up to an excitation energy of E=10.4 MeV and spin I=34 ħ. Two new structures, made of competing ΔI=1 and ΔI=2 transitions have been observed and their connexions with the low-lying levels established. Their lowest levels are located at 6.304 MeV and 6.879 MeV excitation energy. The experimental results are compared with mean-field HF+BCS calculations. It is proposed that the new structures originate from deformation-aligned quasi-proton excitations π(i13/2 * h9/2)K=11 andπ (h9/2) K=8 2 , coupled to rotation-aligned quasi-neutron ν(i13/2)n and quasi-proton π(h11/2)2 excitations.