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Many-channel microscopic cluster model of Be8: S factors

V. I. Zhaba1,*, Yu. A. Lashko1,2,†, and V. S. Vasilevsky1,‡

  • *Contact author: viktorzh@meta.ua
  • †Contact author: ylashko@gmail.com
  • ‡Contact author: vsvasilevsky@gmail.com
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Phys. Rev. C 113, 034324 – Published 30 March, 2026

DOI: https://doi.org/10.1103/8jvl-fg8b

Abstract

We investigate low-energy astrophysical S factors for reactions proceeding through the Be8 compound system with entrance channels p+Li7, n+Be7, and d+Li6. Using the same microscopic many-channel three-cluster framework as in our previous study of the high-lying Be8 spectrum, we calculate S(E) for Li7(p,α)He4, Be7(n,α)He4, Be7(n,p)Li7, Li6(d,α)He4, Li6(d,p)Li7, and Li6(d,n)Be7 in the energy range relevant for primordial and stellar nucleosynthesis. For the mirror reactions Li7(p,α)He4 and Be7(n,α)He4, as well as for Be7(n,p)Li7 the calculated S factors reproduce both the absolute scale and the low-energy trends of the experimental data within their quoted uncertainties, whereas the absolute S factors for the deuteron-induced channels on Li6 are underestimated at low energy, consistent with the shifted Li6+d threshold and the absence of a broad subthreshold 2+ structure in the present implementation. A partial-wave analysis identifies the dominant Jπ contributions in each channel and relates them to specific Be8 resonances, while demonstrating that cluster polarization, previously shown to be crucial for the Be8 spectrum, is likewise essential for the normalization and energy dependence of several S factors. Evaluating S(E) at appropriate Gamow energies, we obtain a hierarchy of reaction channels that quantifies the relative importance of neutron- and deuteron-induced processes for the production and destruction of Li7 and Be7.

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Many-channel microscopic cluster model of Be8: Formation of high-energy resonance states

V. I. Zhaba, Yu. A. Lashko, and V. S. Vasilevsky
Phys. Rev. C 112, 014328 (2025)

Article Text

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Phys. Rev. C 113, 034324– Published 30 March, 2026
  • Received 2 December 2025
  • Revised 2 February 2026
  • Accepted 23 February 2026
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