Energy dependence of the astrophysical S factor for the 6Li ( p,γ ) 7Be reaction

Details Energy dependence of the astrophysical S factor for the 6Li ( p,γ ) 7Be reaction Energy dependence of the astrophysical S factor for the 6Li ( p,γ ) 7Be reaction

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvc..70e5801p&link_type=abstract

Physical Review C, vol. 70, Issue 5, id. 055801

Astronomy and Astrophysics

Astrophysics

7

Radiative Capture, 6<=A<=19, Polarization Phenomena In Reactions, Hydrostatic Stellar Nucleosynthesis

Scientific paper

Polarized proton beams with energies from 80 to 130 keV have been used to determine the slope of the astrophysical S factor for the 6Li ( p, γ0 ) 7Be and 6Li ( p, γ1 ) 7Be reactions. The slope was determined from the relative yields at five incident proton energies. The slope of the S factor was found to be negative. The analyzing power measurements indicate that the reaction proceeds predominately by s -wave capture. The negative slope does not appear to be due to low-binding-energy effects, the effects of nearby resonances, or electron screening of the nuclei. A resonating group model calculation demonstrates a new mechanism for producing a negative slope at astrophysically relevant energies in radiative capture reactions.

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