Study of the27Al(d, α)25Mg and27Al(d, p)28al nuclear reactions at 2 MeV deuteron energy

Abstract

Differential excitation functions and angular distributions from 30° to 150° have been measured for the27Al(d, α)26Mg and27Al(d, p)28Al reactions leading to the ground state and to the first excited states of the residual nuclei25Mg and28Al, in the deuteron energy range (1.4≪2.3) MeV. The overall energy resolution was 10 keV for the differential excitation functions and 2 0 keV for the angular distributions. Fluctuations occurring in the differential excitation functions as well as in the integrated cross-sections have been analysed on the basis of the statistical theory. In particular, with the use of correlation functions, values of Γ=(40±10)keV and θ0≃30° have been deduced for the « coherence » energy and the « coherence » angle, respectively. The theoretical values of Γ and the average values of the integrated cross-sections have been evaluated using a consistent set of parameters. The analysis showed that the predictions of the statistical model agree with the experimental results for the27Al(d, α)25Mg reactions. Both statistical and nonstatistioal effects have been found to contribute to the27Al(d, p)28Al reaction for the proton transitions leading to the low-lying levels of the residual nucleus.