Abstract
The astrophysical factor for the radiative proton capture reaction on () at low energies is affected by the -wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the system in the center-of-mass energy range 0.474–2.740 MeV and center-of-mass angular range –. A radioactive beam produced at Oak Ridge National Laboratory's (ORNL) Holifield Radioactive Ion Beam Facility was accelerated and bombarded a thin polypropylene target. Scattered ions were detected in the segmented Silicon Detector Array. Using an -matrix analysis of ORNL and Louvain-la-Neuve cross-section data, the -wave scattering lengths for channel spins 1 and 2 were determined to be and fm, respectively. The uncertainty in the -wave scattering lengths reported in this work is smaller by a factor of 5–8 compared to the previous measurement, which may reduce the overall uncertainty in at zero energy. The level structure of is discussed based upon the results from this work. Evidence for the existence of and levels in at 1.9 and 2.21 MeV, respectively, is observed.
5 More- Received 4 February 2019
DOI:https://doi.org/10.1103/PhysRevC.99.045807
©2019 American Physical Society