59Co($\vec p$,α) reaction at 100 MeV incident energy – statistical multistep direct reaction into the continuum of outgoing energies

S S Dimitrova,E V Zemlyanaya,K V Lukyanov,A A Cowley

doi:10.1051/epjconf/201610708005

Abstract

The pre-equilibrium proton induced emission of light complex nuclei with energies in the continuum has been studied comprehensively for many years. Double–differential cross sections and especially analyzing power distributions are typical of an intranuclear nucleon-nucleon multistep statistical reaction mechanism. The final stage of the reaction may be a result of a direct pickup or knockout of the ejectile. The discussion on this subject continues to be a hot topic for both theoretical and experimental investigations. In this paper the results from the latest studies of the inclusive (, α) reactions on 59 Co to the continuum will be reported. The formalism based on the statistical multistep direct emission formulation of Feshbach, Kerman and Koonin is found to give a reasonably good reproduction of cross section and analyzing power distributions at various emission energies. Special attention will be paid to the details of the calculations.

Highlights

For many years pre-equilibrium reactions have been an interesting topic of both experimental and theoretical studies
Double–differential cross sections and especially analyzing power distributions are typical of an intranuclear nucleon-nucleon multistep statistical reaction mechanism
It has been shown that the reaction mechanism can be understood fairly accurately in terms of a series of multiple intranuclear nucleon-nucleon collisions, which end in a direct transfer of the emitted particle [1, 2]

Summary

Introduction

For many years pre-equilibrium reactions have been an interesting topic of both experimental and theoretical studies. The reaction mechanism of the direct transfer depends on the incident energy of the projectile and on the ejectile. In our recent papers [3,4,5] we have investigated the properties of the 93Nb(p,α) reactions at 65 MeV to 160 MeV incident energy to the continuum, especially the dependence of the reaction mechanism on the proton energy. In this paper we will test the A–dependence of properties of the pre–equilibrium reactions in the lower mass region. We will study the properties of the 59Co(p,α) reaction at 100 MeV incident energy for a number of outgoing energies.

Experiment and theory

Results

Conclusion