An analysis of 25Al energy levels observed in the 28Si(p, ·)25Al reaction

Abstract

The level structure of 25 Al has been studied at the ORNL Holifield Radioactive Ion Beam Facility (HRIBF) by measuring the angular and energy distributions of alpha particles from the 28 Si(p,α) 25 Al reaction. Proton beams (~10 nA) at laboratory energies of 40-and 42-MeV were generated by the 25 MV tandem accelerator and bombarded a natural silicon target (50 µg/cm 2). Alpha particles were detected and identified in the Silicon Detector Array (SIDAR) in the "telescope" configuration [1]. Eighteen levels have been observed and spins for several have been constrained through a distorted-wave Born approximation (DWBA) analysis of the angular distributions.