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

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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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Authors and Affiliations

  1. CSNSM, IN2P3-CNRS and Université Paris-Sud, 91405, Orsay, France

    M. -G. Porquet, A. Astier, Ts. Venkova, A. Prévost & I. Deloncle

  2. INRNE, BAS, 1784, Sofia, Bulgaria

    Ts. Venkova

  3. IPHC, IN2P3-CNRS and Université Louis Pasteur, 67037, Strasbourg Cedex 2, France

    F. Azaiez, A. Buta, D. Curien, O. Dorvaux, G. Duchêne, B. J. P. Gall, F. Khalfallah, I. Piqueras & M. Rousseau

  4. IPNL, IN2P3-CNRS and Université Claude Bernard, 69622, Villeurbanne Cedex, France

    M. Meyer, N. Redon & O. Stézowski

  5. CEA/Saclay, DSM/DAPNIA/SPhN, 91191, Gif-sur-Yvette Cedex, France

    R. Lucas

  6. JINR, Joliot-Curie 6, 142080, Dubna, Moscow region, Russia

    A. Bogachev

Authors
  1. M. -G. Porquet
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  2. A. Astier
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  3. Ts. Venkova
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  4. A. Prévost
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  5. I. Deloncle
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  6. F. Azaiez
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  7. A. Buta
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  8. D. Curien
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  9. O. Dorvaux
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  10. G. Duchêne
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  11. B. J. P. Gall
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  12. F. Khalfallah
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  13. I. Piqueras
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  14. M. Rousseau
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  15. M. Meyer
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  16. N. Redon
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  17. O. Stézowski
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  18. R. Lucas
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  19. A. Bogachev
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Correspondence to M. -G. Porquet.

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Porquet, M.G., Astier, A., Venkova, T. et al. High-spin excitations of 81, 82, 83, 85Se : Competing single-particle and collective structures around N = 50. Eur. Phys. J. A 39, 295–306 (2009). https://doi.org/10.1140/epja/i2008-10723-2

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  • DOI: https://doi.org/10.1140/epja/i2008-10723-2

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