Coulomb Nuclear Interference in 31Cl Breakup Reaction

Abstract

The effect of Coulomb nuclear interference on the magnitude of core fragment longitudinal momentum distribution (LMD) width and single proton breakup cross-section has been examined quantitatively for ³¹Cl nucleus breakup reaction. The analysis is performed for ¹²C, ⁵⁸Ni, and ²⁰⁸Pb targets in a range of intermediate incident energies (40-100 AMeV), using a semiclassical method that treats the full Coulomb and nuclear interaction to all orders, including full multipole expansion of the Coulomb potential. We examined, in detail, the interference between Coulomb and nuclear diffraction reaction mechanisms and also between core-target and proton-target Coulomb potentials and quantitatively analyzed its effect on the breakup observables. The sensitivity of interference on the target size and incident energy is also examined. Our calculations show that due to the interference effect in light and heavy target cases, the absolute magnitude of a single proton breakup cross-section varies from 1% to 7%, while for medium target, it varies around 20%; on the other hand, the Full Width Half Maxima (FWHM) width of longitudinal momentum distribution varies approximately from 1% to 4% for all the target nuclei. Therefore, we believe that our work presented a bit deeper insight into the role of Coulomb nuclear interferences in ³¹Cl breakup reaction, which is helpful for a better understanding of experimental data and planning future breakup reaction experiments.