Abstract
The reaction was studied by measuring the rays that were produced when 80–100-keV polarized protons were stopped in a thick target. Cross sections and vector analyzing powers at were determined as a function of energy for capture to the ground and first excited states of These analyzing powers are particularly sensitive to the interference between s- and p-wave contributions, and to the relative phase between direct and resonance amplitudes. The results were used to produce a reliable extrapolation of the astrophysical S factor at 0 keV by means of a direct-capture-plus-resonances model calculation. The value of that was obtained for is in agreement with previously determined values, but for the value of is and is more than twice as large as previously determined values.
- Received 5 April 2000
DOI:https://doi.org/10.1103/PhysRevC.62.025803
©2000 American Physical Society