The 3He(alpha,gamma)7Be S-factor at solar energies: the prompt gamma experiment at LUNA

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.

Accepted for publication in Nucl. Phys. A

References in corpus (6)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Activation measurement of the 3He(alpha,gamma)7Be cross section at low energy
• Astrophysical S-factor of the 3He(alpha,gamma)7Be reaction measured at low energy via prompt and delayed gamma detection
• First measurement of the 14N(p,gamma)15O cross section down to 70 keV
• 3He(alpha,gamma)7Be cross section at low energies
• The 3He + 4He --> 7Be Astrophysical S-factor

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• LUNA: Status and Prospects
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• The activation method for cross section measurements in nuclear astrophysics
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• Bayesian Estimation of Thermonuclear Reaction Rates
• Performing Bayesian analyses with AZURE2 using BRICK: an application to the ${}^7$Be system
• Thermonuclear reaction rates and primordial nucleosynthesis
• Cross section of ${}^3$He($\alpha$,$\gamma$)${}^7$Be around the ${}^7$Be proton separation threshold
• Low-energy ${}^3$He($\alpha$,$\alpha$)${}^3$He elastic scattering and the ${}^3$He($\alpha$,$\gamma$)${}^7$Be reaction
• Exploring Stars in Underground Laboratories: Challenges and Solutions
• Shell and explosive hydrogen burning
• Experimental determination of the ${}^3$He($\alpha$,$\gamma$)${}^7$Be reaction cross section above the ${}^7$Be proton separation threshold
• Stellar evolution and modelling stars
• The 2025 Evaluation of Experimental Thermonuclear Reaction Rates (ETR25)