Primordial deuterium abundance from calculations of $p(n,\gamma )$ and $d(p,\gamma )$ reactions within potential-model approach

Abstract

The $p(n,\gamma )$ and $d(p,\gamma )$ reactions are key nuclear inputs for Big Bang nucleosynthesis. In this work, both reactions are analyzed within a consistent two-body potential framework based on the Malfliet-Tjon interaction, including contributions from both $E1$ and $M1$ transitions. A single scaling factor $\lambda$ controlling the low-energy scattering dynamics is constrained by the $p(n,\gamma )$ and propagated consistently to the $d(p,\gamma )$. The obtained abundance, $D/H=2.479_{-0.177}^{+0.350}\times 10^{-5}$, is in good agreement with values inferred from metal-poor damped Lyman-$\alpha$ systems. The modest variations of $\lambda$ lead to a significant change in the predicted $D/H$ ratio and light-element abundances.

13 pages, 3 figures, 5 tables, accepted for publication in Physica Scripta

References in corpus (12)

• The Primordial Lithium Problem
• A new tension in the cosmological model from primordial deuterium?
• Primordial Deuterium after LUNA: concordances and error budget
• Evaluation of Modern 3He(alpha,gamma)7Be Data
• The Impact of New d(p,γ)He3 Rates on Big Bang Nucleosynthesis
• Astrophysical S-Factor of p2H Radiative Capture
• Bayesian Estimation of the D(p,$\gamma$)${}^3$He Thermonuclear Reaction Rate
• Solar fusion III: New data and theory for hydrogen-burning stars
• Measurement of the ${}^2$H($p,\gamma$)${}^3$He S-factor at 265-1094keV
• Low-energy ${}^7$Li($n,\gamma$)${}^8$Li and ${}^7$Be($p,\gamma$)${}^8$B radiative capture reactions within the Skyrme Hartree-Fock approach
• High-Precision Measurement of D($\gamma$, $n$)$p$ Photodisintegration Reaction and Implications for Big-Bang Nucleosynthesis
• Magnetic dipole transition in proton-deuteron radiative capture at BBN energies within potential model