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High-spin excitations of $^{81, 82, 83, 85}$Se : Competing single-particle and collective structures around N = 50

Abstract : The 81, 82, 83, 85Se nuclei have been produced as fission fragments in the fusion reaction 18O + 208Pb at 85MeV bombarding energy and studied with the Euroball IV array. Their high-spin level schemes have been built from the triple $ \gamma$ -ray coincidence data and $ \gamma$ - $ \gamma$ angular correlations have been analyzed in order to assign spin and parity values to many observed states. The lowest-spin states of the two-neutron and three-neutron configurations are strongly mixed with two-proton excitations among the fp orbits. On the other hand, the highest-spin states of these neutron configurations are found to remain almost pure. Neutron excitation across the N = 50 gap is observed both in 83Se49 and in 85Se51
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Contributor : Dominique Girod <>
Submitted on : Friday, April 24, 2009 - 11:32:40 AM
Last modification on : Friday, September 10, 2021 - 1:50:10 PM

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M.-G. Porquet, A. Astier, Ts. Venkova, A. Prévost, I. Deloncle, et al.. High-spin excitations of $^{81, 82, 83, 85}$Se : Competing single-particle and collective structures around N = 50. European Physical Journal A, EDP Sciences, 2009, 39, pp.295-306. ⟨10.1140/epja/i2008-10723-2⟩. ⟨in2p3-00378429⟩

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