The 14N( 3He, α) 13N reaction

Abstract

Differential cross sections for the 14N( 3He, α) 13N reaction leading to the ground, 2.37 and (3.51 + 3.56) MeV states of 13N have been measured for incident energies from 2.5 to 8.5 MeV. Large fluctuations are observed in excitation functions at 50°, 90° and 165°. Angular distributions over the range from 5° to 165° exhibit pronounced forward and backward peaking at 4.5 and 5.5 MeV, but relatively less backward peaking at 7.0 MeV. Differential cross sections for the elastic scattering of 3He from 14N at 4.5 and 7.0 MeV have been measured and used to determine optical potentials. Distorted wave analyses of reaction angular distributions at 7.0 MeV to the ground and 2.37 MeV states have been made. Spectroscopic factors were extracted assuming a direct pickup reaction mechanism. Calculations of the angular distribution to the 2.37 MeV state, assuming a direct knockout reaction mechanism, were made and are compared with the pickup calculations.