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arXiv · 2603.18717

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

Nguyen Le Anh·Dao Nhut Anh·Hoang Thai An·Nguyen Gia Huy·Bui Minh Loc
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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, $\mathrm{D/H} = 2.479^{+0.350}_{-0.177}\times 10^{-5}$, 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 $\mathrm{D/H}$ ratio and light-element abundances.

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Nguyen Le Anh, Dao Nhut Anh, Hoang Thai An, Nguyen Gia Huy, Bui Minh Loc. 2026-03-19. Primordial deuterium abundance from calculations of $p(n,\gamma)$ and $d(p,\gamma)$ reactions within potential-model approach. https://doi.org/10.1088/1402-4896%2Fae560e

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