Energy dependence of the astrophysical S factor for the6
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, γ,0)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.
Prior, RM; Spraker, MC; Amthor, AM; Keeter, KJ; Nelson, SO; Sabourov, A; Sabourov, K; Tonchev, A; Ahmed, M; Kelley, JH; Tilley, DR; Weller, HR; Hofmann, HM
Volume / Issue
International Standard Serial Number (ISSN)
Digital Object Identifier (DOI)