The 27Al( 3He, α) 26Al reaction at 10 MeV bombarding energy

Abstract

The reaction 27Al( 3He, α) 26Al has been studied at 10 MeV bombarding energy. Angular distributions were measured for the ground state and the first (0.229 MeV), second (0.418 MeV), third (1.059 MeV), “fourth” (1.760/1.852 MeV) and “sixth” (2.07/2.08) MeV excited states in 26Al. The spectra were recorded at every 5° between 15° and 165°(lab). The direct-interaction contributions to the cross sections were calculated using the distorted wave Born approximation and are compared with the observations. The effects of both a finite-range interaction and the non-locality of the optical potentials are also considered. For optical-model parameters which describe the related elastic scattering results, an l = 2 neutron transfer was found to be most consistent with the data in all cases except for the transitions to the 1.760/1.852 MeV levels, which do not seem to proceed via a direct interaction. Relative spectroscopic factors have been determined and are in good agreement with a simple model in which 27Al and 26Al consist only of ( d 5 2 ) −1 and ( d 5 2 ) −2 configurations.