High-spin excitations of $^{81, 82, 83, 85}$Se : Competing single-particle and collective structures around N = 50 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue European Physical Journal A Année : 2009

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

D. Curien
G. Duchêne
B.J.P. Gall
A. Bogachev
  • Fonction : Auteur

Résumé

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

Dates et versions

in2p3-00378429 , version 1 (24-04-2009)

Identifiants

Citer

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, 2009, 39, pp.295-306. ⟨10.1140/epja/i2008-10723-2⟩. ⟨in2p3-00378429⟩
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