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Assessing the impact of valence sd neutrons and protons on fusion

Varinderjit Singh, J. Vadas, T. K. Steinbach, B. B. Wiggins, S. Hudan, and R. T. deSouza
Phys. Rev. C 103, 064606 – Published 10 June 2021
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Abstract
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  • INTRODUCTION
  • EXPERIMENTAL DETAILS
  • RESULTS AND DISCUSSION
  • SUMMARY
  • ACKNOWLEDGMENTS
    • References

    Abstract

    Experimental near-barrier fusion cross sections for F17+C12 are compared to the fusion excitation functions for O16,17,18, F19, and Ne20 ions on a carbon target. Normalized or reduced fusion cross sections are utilized in order to compare the different systems and account for the differing static size of the incident ions as well as changes in fusion barrier. Fusion excitation functions for the case of the mirror nuclei F17 and O17 with a single sd nucleon are compared. The F17 data are also juxtaposed with nuclei involving multiple sd nucleons. Trends of the fusion cross section above the barrier beyond the expected systematic behavior are observed. These trends are interpreted as the interplay of the sd protons and neutrons. The experimental data are also compared to a widely used analytic model of near-barrier fusion, a time-dependent Hartree-Fock model, and coupled channels calculations.

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    • Received 13 April 2021
    • Accepted 1 June 2021

    DOI:https://doi.org/10.1103/PhysRevC.103.064606

    ©2021 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Low & intermediate energy heavy-ion reactionsNuclear fusionUnstable nuclei induced nuclear reactions
    Nuclear Physics

    Authors & Affiliations

    Varinderjit Singh, J. Vadas, T. K. Steinbach, B. B. Wiggins, S. Hudan, and R. T. deSouza*

    • Department of Chemistry and Center for Exploration of Energy and Matter, Indiana University, 2401 Milo B. Sampson Lane, Bloomington, Indiana 47408, USA

    • *desouza@indiana.edu

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    Issue

    Vol. 103, Iss. 6 — June 2021

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    Images

    • Figure 1
      Figure 1

      Schematic of the experimental setup along with particle identification and ETOF spectra. Particle identification of the F17 and O16 ions incident on the target is displayed in the left plot. In the right plot a representative ETOF spectrum (selected on F17) used to identify evaporation residues (ER) at ELAB=30.7MeV.

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    • Figure 2
      Figure 2

      Fusion excitation functions for O16+C12 (top panel) and F17,19+C12 (bottom panel). The predictions of an analytic fusion model [13] are indicated by the solid lines.

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    • Figure 3
      Figure 3

      Fusion excitation functions for O18+C12 (top panel) and Ne20+C12 (bottom panel) together with the predictions of the analytic model [13]. The fit of the Ne20 data by a one-dimensional barrier-penetration model [19] is depicted by the dashed line.

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    • Figure 4
      Figure 4

      Comparison of the normalized and reduced excitation functions for fusion of O16 and O18 ions (top panel) and O18, Ne20, F19, and F17 ions (lower panels) on a carbon target. The line through the Ne20 data simply serves to guide the eye.

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    • Figure 5
      Figure 5

      Comparison of the reduced fusion excitation function and normalized excitation function for the mirror nuclei F17 and O17 with a C12 target.

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    • Figure 6
      Figure 6

      Comparison of the fusion excitation function for F17,19+C12 with the predictions of a TDHF model (a) and ccfull (b).

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