Abstract:
This research work have been done for the completion of MSc. degree in
physics (Nuclear physics) under the title ”The Role of One Proton Charge
Excess in the Cross Section for the Formation and Decay of Compound
Nucleus by α emission”. This was to evaluate the effect of a single excess charge on the formation and decay of compound nucleus reaction of
the neutron and proton, n and p, induced reactions with the same target and at the same energy. To achieve the objective the selected nuclear
reactions were 23N a(n, α)
20F ,
23N a(p, α)
20Ne to represent light mass region, 65Cu(n, α)
62Co,
65Cu(p, α)
62N i to represent medium mass region, and
90Zr(n, α)
87Sr & 90Zr(p, α)
87Y for the higher mass region.
From the research it was concluded that, the coulomb barrier available when
the proton projectile approaches the 23N a target nucleus reduces the chance
of of reaction between the projectile and the target. This suppresses the reaction cross section for the compound nucleus in light mass region by proton
projectile than neutron projectile at the same energy and target. But for the
medium and heavy mass region compound nucleus reaction cross section by
proton on the same target and the same projectile energy is higher due to the
decay of the compound nucleus by alpha particle emission gets supported by
the coulomb energy between the residual nucleus and the outgoing particle.
