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Particle- \(\gamma\) coincidence spectroscopy of the N = 90 nucleus 154Gd by (\(p,t\gamma\))

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Abstract.

A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156Gd(\(p,t\gamma\))154Gd direct reaction by particle- \( \gamma\) coincidence spectroscopy. New cross sections with a 25MeV proton beam are reported and compared to previous (p,t) and (t,p) studies. Furthermore, additional evidence for coexisting \( K^{\pi}=0_{1}^{+},2_{1}^{+}\) and \(0_{2}^{+}\), \(2_{2}^{+}\) configurations at N = 90 is presented. Direct and indirect population patterns of the low-lying states are also explored. Review of the new and existing evidence favors an interpretation based on a configuration-dependent pairing interaction. The weakening of monopole pairing strength and an increase in quadrupole pairing strength could bring 2p-2h \(0^{+}\) states below \(2\Delta\). This may account for a large number of the low-lying \(0^{+}\) states observed in two-nucleon transfer reactions. A hypothesis for the origin of the \(0_{2}^{+}\) and \( 0_{3}^{+}\) states is provided.

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Author information

Authors and Affiliations

  1. Physics Division, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA

    J. M. Allmond

  2. Department of Physics, University of Richmond, 23173, Richmond, VA, USA

    J. M. Allmond, C. W. Beausang, T. J. Ross, P. Humby, W. Brooks & B. K. Darakchieva

  3. Department of Physics, University of Surrey, GU27XH, Guildford, Surrey, UK

    P. Humby

  4. Nuclear Science Division, Lawrence Berkeley National Laboratory, 94720, Berkeley, CA, USA

    M. S. Basunia, L. A. Bernstein, P. Fallon, H. B. Jeppesen, M. A. McMahan, L. Phair & J. O. Rasmussen

  5. Department of Nuclear Engineering, University of California, 94720, Berkeley, CA, USA

    L. A. Bernstein, K. E. Evans & S. R. Stroberg

  6. Lawrence Livermore National Laboratory, 94551, Livermore, CA, USA

    D. L. Bleuel, J. T. Burke, S. R. Lesher, N. D. Scielzo & M. Wiedeking

  7. School of Physics, Georgia Institute of Technology, 30332, Atlanta, GA, USA

    N. Brown

  8. Department of Physics, Rhodes College, 38112, Memphis, TN, USA

    K. R. Dudziak, J. D. LeBlanc & D. A. Meyer

  9. Department of Physics, University of Wisconsin-La Crosse, 54601, La Crosse, WI, USA

    S. R. Lesher

  10. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, British Columbia, Canada

    S. R. Stroberg

  11. Department of Nuclear Physics, iThemba LABS, P.O. Box 722, 7129, Somerset West, South Africa

    M. Wiedeking

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  1. J. M. Allmond
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  2. C. W. Beausang
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  5. M. S. Basunia
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  7. D. L. Bleuel
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  13. K. E. Evans
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  19. D. A. Meyer
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Corresponding author

Correspondence to J. M. Allmond.

Additional information

Communicated by A. Gade

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Allmond, J.M., Beausang, C.W., Ross, T.J. et al. Particle- \(\gamma\) coincidence spectroscopy of the N = 90 nucleus 154Gd by (\(p,t\gamma\)) . Eur. Phys. J. A 53, 62 (2017). https://doi.org/10.1140/epja/i2017-12253-2

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