Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Nuclear Astrophysics VI

HK 45.2: Talk

Thursday, March 13, 2025, 14:15–14:30, SR 0.03 Erw. Physik

The ²H(p,γ)³He reaction studied at Felsenkeller underground lab — •Maria Lukyanova^1,2, Daniel Bemmerer¹, Axel Boeltzig¹, Antonio Caciolli^3,4, Peter Hempel^1,2, Eliana Masha¹, Konrad Schmidt¹, Anup Yadav^1,2, and Kai Zuber² — ¹Helmholtz-Zentrum Dresden-Rossendorf (HZDR) — ²TU-Dresden — ³INFN Sezione di Padova, Italy — ⁴Università degli Studi di Padova, Italy

The ²H(p,γ)³He reaction is one of the primary processes responsible for deuterium destruction during Big Bang Nucleosynthesis (BBN), significantly impacting the primordial deuterium abundance (²H). Previously, this reaction has been directly measured at BBN energies at LUNA using a gas target system. However, experimental data obtained at higher energies using solid targets suggest a 10% higher extrapolated cross-section. Recently, at the Felsenkeller 5 MV shallow-underground accelerator lab in Dresden, we measured the ²H(p,γ)³He reaction in the proton beam energy range 300-1200 keV providing partial overlap with both low-energy and high-energy datasets. The experimental setup and preliminary results, including γ-ray angular distributions, will be presented.

Keywords: BBN; underground lab; Angular distributions; Gamma-Ray Spectroscopy; Ion Beam Accelerator