Astrophysical S factors for the {sup 9}Be({rvec p},{gamma}){sup 10}B reaction
- Department of Physics, Duke University, Durham, North Carolina 27708 (United States)
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708 (United States)
- Department of Physics, North Georgia College and State University, Dahlonega, Georgia 30597 (United States)
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695 (United States)
Analyzing powers for the {sup 9}Be({rvec p},{gamma}){sup 10}B reaction were measured by stopping a 100 keV polarized proton beam in a {sup 9}Be target. The measured vector analyzing power is A{sub y}(90{degree})=0.18{plus_minus}0.03 for capture to the ground state, with smaller values at 90{degree} for the first three excited states. Astrophysical S factors were calculated for each of the final states using a direct capture plus resonance model which fit both the present analyzing power data and the previously reported cross section data. The calculated S factors at E{sub p}=0 keV for capture to the ground state and first three excited states were 0.25, 0.34, 0.27, and 0.10 keV b, respectively, which are considerably smaller than previously reported. The observed analyzing powers are explained, within experimental uncertainty, as arising from the interference of the E1 direct capture amplitude with the tails of nearby p-wave and s-wave resonances. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 638830
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 58; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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