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Is the 4.742 MeV state in 88Sr the 1− two-phonon state?

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Abstract:

A nuclear resonance fluorescence experiment on 88Sr has been performed with bremsstrahlung of 6.7 MeV endpoint energy. The γ-ray linear polarisation has been measured with a EUROBALL CLUSTER detector used as a Compton polarimeter. The results indicate positive parity for the J= 1 state at 4.742 MeV in 88Sr, in contrast to the previous interpretation as a 1− two-phonon (2+ 1⊗ 3− 1) state and in conflict with the predictions of the quasiparticle-phonon model. On the basis of such calculations the 1+ state at 3.486 MeV may be considered as the 1+ 1 one-phonon state and the very strong 1+ 1→ 0+ 1 deexcitation as proton spin-flip 2p1/2→ 2p3/2 transition.

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Authors and Affiliations

  1. Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, 01314 Dresden, Germany, , , , , , DE

    L. Käubler, H. Schnare, R. Schwengner, F. Dönau, E. Grosse & H. Prade

  2. Institut für Kernphysik der Universität zu Köln, 50937 Köln, Germany, , , , , , DE

    P. von Brentano, J. Eberth, A. Fitzler, C. Fransen, R.-D. Herzberg, N. Pietralla, S. Skoda, H.-G. Thomas, H. Tiesler, D. Weisshaar & I. Wiedenhöver

  3. Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany, , , , , , DE

    J. Enders, H. Kaiser, P. von Neumann-Cosel & A. Richter

  4. Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria, , , , , , BG

    M. Grinberg & Ch. Stoyanov

Authors
  1. L. Käubler
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  2. H. Schnare
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  3. R. Schwengner
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  4. P. von Brentano
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  5. F. Dönau
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  6. J. Eberth
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  7. J. Enders
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  8. A. Fitzler
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  9. C. Fransen
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  10. M. Grinberg
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  11. E. Grosse
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  12. R.-D. Herzberg
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  13. H. Kaiser
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  14. P. von Neumann-Cosel
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  15. N. Pietralla
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  16. H. Prade
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  17. A. Richter
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  18. S. Skoda
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  19. Ch. Stoyanov
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  20. H.-G. Thomas
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  21. H. Tiesler
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  22. D. Weisshaar
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  23. I. Wiedenhöver
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Received: 3 November 1999

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Käubler, L., Schnare, H., Schwengner, R. et al. Is the 4.742 MeV state in 88Sr the 1− two-phonon state?. EPJ A 7, 15–18 (2000). https://doi.org/10.1007/s100500050004

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  • DOI: https://doi.org/10.1007/s100500050004

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