The 3He + 4He --> 7Be Astrophysical S-factor
T. A. D. Brown, C. Bordeanu, K. A. Snover, D. W. Storm, D. Melconian,, A. L. Sallaska, S. K. L. Sjue, and S. Triambak
TL;DR
This paper reports precise measurements of the 3He + 4He fusion reaction's astrophysical S-factor, providing data crucial for understanding Big Bang nucleosynthesis and solar neutrino production.
Contribution
The study offers new high-precision measurements of the 3He + 4He reaction S-factor, aligning prompt gamma and activity data, and refines the S(0) value with implications for astrophysics.
Findings
Measured S(0) = 0.595 +/- 0.018 keV b
Prompt gamma and activity measurements agree within a few percent
Results impact models of Big Bang Nucleosynthesis and solar neutrino flux
Abstract
We present precision measurements of the 3He + 4He --> 7Be reaction in the range ECM = 0.33 to 1.23 MeV using a small gas cell and detection of both prompt gamma rays and 7Be activity. Our prompt and activity measurements are in good agreement within an experimental uncertainty of several percent. We find S(0) = 0.595 +/- 0.018 keV b from fits of the Kajino theory to our data. We compare our results with published measurements, and we discuss the consequences for Big Bang Nucleosynthesis and for solar neutrino flux calculations.
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