α+dLi6+γ astrophysical S factor and its implications for Big Bang nucleosynthesis

A. Grassi, G. Mangano, L. E. Marcucci, and O. Pisanti
Phys. Rev. C 96, 045807 – Published 12 October 2017

Abstract

The α+d6Li+γ radiative capture is studied in order to predict the Li6 primordial abundance. Within a two-body framework, the α particle and the deuteron are considered the structureless constituents of Li6. Five α+d potentials are used to solve the two-body problem: four of them are taken from the literature, only one having also a tensor component. A fifth model is here constructed in order to reproduce, besides the Li6 static properties as binding energy, magnetic dipole, and electric quadrupole moments, also the S-state asymptotic normalization coefficient (ANC). The two-body bound and scattering problem is solved with different techniques, in order to minimize the numerical uncertainty of the present results. The long-wavelength approximation is used, and therefore only the electric dipole and quadrupole operators are retained. The astrophysical S factor is found to be significantly sensitive to the ANC, but in all the cases in good agreement with the available experimental data. The theoretical uncertainty has been estimated of the order of few percent when the potentials which reproduce the ANC are considered, but increases up to 20% when all five potential models are retained. The effect of this S-factor prediction on the Li6 primordial abundance is studied, using the public code PArthENoPE. For the five models considered here we find Li6/H=(0.91.8)×1014, with the baryon density parameter in the 3-σ range of Planck 2015 analysis, Ωbh2=0.02226±0.00023.

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  • Received 28 July 2017

DOI:https://doi.org/10.1103/PhysRevC.96.045807

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

A. Grassi1,*, G. Mangano2, L. E. Marcucci1,3, and O. Pisanti2,4

  • 1Department of Physics, University of Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
  • 2INFN, Sezione di Napoli, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy
  • 3INFN-Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, I-56127 Pisa, Italy
  • 4Dipartimento di Fisica Ettore Pancini, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy

  • *Present address: M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30348, Kraków, Poland.

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Vol. 96, Iss. 4 — October 2017

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