The 3He(alpha,gamma)7Be S-factor at solar energies: the prompt gamma experiment at LUNA
H. Costantini, D. Bemmerer, F. Confortola, A. Formicola, Gy. Gy\"urky,, P. Bezzon, R. Bonetti, C. Broggini, P. Corvisiero, Z. Elekes, Zs. F\"ul\"op,, G. Gervino, A. Guglielmetti, C. Gustavino, G. Imbriani, M. Junker, M., Laubenstein, A. Lemut, B. Limata, V. Lozza, M. Marta
TL;DR
This paper reports a new measurement of the 3He(alpha,gamma)7Be reaction cross section at solar energies using prompt gamma detection at LUNA, providing data crucial for understanding stellar nucleosynthesis and Big-Bang models.
Contribution
It presents the first detailed prompt gamma detection experiment for 3He(alpha,gamma)7Be at LUNA, including systematic uncertainty analysis and comparison with theoretical models.
Findings
New cross section data at solar energies
Agreement with previous experiments and models
Refined S-factor estimates for stellar models
Abstract
The 3He(alpha,gamma)7Be process is a key reaction in both Big-Bang nucleosynthesis and p-p chain of Hydrogen Burning in Stars. A new measurement of the 3He(alpha,gamma)7Be cross section has been performed at the INFN Gran Sasso underground laboratory by both the activation and the prompt gamma detection methods. The present work reports full details of the prompt gamma detection experiment, focusing on the determination of the systematic uncertainty. The final data, including activation measurements at LUNA, are compared with the results of the last generation experiments and two different theoretical models are used to obtain the S-factor at solar energies.
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