Abstract
The second excited state of the proton-rich nucleus has been observed for the first time using the elastic scattering reaction An intense radioactive beam was produced at the CRC-RIB facility at Louvain-la-Neuve to bombard a polyethylene target. The recoil protons were detected at 20 different angles in the LEDA segmented silicon detector. The resulting elastic scattering cross sections have been analyzed using a global R-matrix fit. We find that the second excited state in lies at the center-of-mass energy with respect to the threshold, and has a proton width The Coulomb shift between the mirror levels in and is 0.73 MeV, among the largest values currently observed in light exotic nuclei.
- Received 29 July 2002
DOI:https://doi.org/10.1103/PhysRevC.67.014308
©2003 American Physical Society