Programme

P.49 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Impact of nuclear reaction cross sections on primordial deuterium abundance

Dao Nhut Anh (1), Do Huy Tho (1), Nguyen Le Anh (2)

(1) Ho Chi Minh City University of Education (HCMUE), Ho Chi Minh City; (2) Department of Physics, Ho Chi Minh City University of Education, Ho Chi Minh City

Radiative capture reactions critically determine primordial deuterium production during Big Bang nucleosynthesis (BBN). A microscopic potential model is employed to calculate electromagnetic transition matrix elements and updated astrophysical $S$-factors. The corresponding reaction rates are implemented in a 40‑reaction BBN network, yielding a deuterium‑to‑hydrogen ratio in excellent agreement with Lyman‑alpha absorption measurements of high‑redshift gas clouds. The study highlights the strong sensitivity of BBN predictions to low‑energy nuclear inputs and provides tighter constraints on the cosmic baryon density.

Presenter: Dao Nhut Anh