$s$-wave scattering lengths for the $^7$Be+p system from an $\textit{R}$-matrix analysis
Abstract
The astrophysical -factor for the radiative proton capture reaction on Be () at low energies is affected by the -wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the Be+p system in the center-of-mass energy range 0.474 - 2.740 MeV and center-of-mass angular range of 70- 150. A radioactive Be beam produced at Oak Ridge National Laboratory's (ORNL) Holifield Radioactive Ion Beam Facility was accelerated and bombarded a thin polypropylene (CH) 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 17.34 and -3.18 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 B is discussed based upon the results from this work. Evidence for the existence of 0 and 2 levels in B at 1.9 and 2.21 MeV, respectively, is observed.
Keywords
Cite
@article{arxiv.1902.00417,
title = {$s$-wave scattering lengths for the $^7$Be+p system from an $\textit{R}$-matrix analysis},
author = {S. N. Paneru and C. R. Brune and R. Giri and R. J. Livesay and U. Greife and J. C. Blackmon and D. W. Bardayan and K. A. Chipps and B. Davids and D. S. Connolly and K. Y. Chae and A. E. Champagne and C. Deibel and K. L. Jones and M. S. Johnson and R. L. Kozub and Z. Ma and C. D. Nesaraja and S. D. Pain and F. Sarazin and J. F. Shriner and D. W. Stracener and M. S. Smith and J. S. Thomas and D. W. Visser and C. Wrede},
journal= {arXiv preprint arXiv:1902.00417},
year = {2019}
}