Dessie, Melese (2016) Study of Reaction Mechanism in P+51V and P+209Bi Systems at Various Proton Energies. Masters thesis, Addis Ababa University.
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Abstract
In this thesis, proton induced reactions on 51V and 209Bi have been studied for various proton energies (7 - 70 MeV). Theoretical equilibrium (EQ) and pre-equilibrium (PE) excitation functions are compared with experimental values. The study showed that the EQ excitation functions are not comparable to that of the experimental at higher energies in all reactions. It is also observed that neither EQ nor PE excitation functions are compatible to that of the experimental for 51V(p,3n) and 51V(p,4n) reactions; the cross-section peaks of 209Bi(p,xn) reactions increase as the number of emitting neutrons increases from one to three; and the cross-section values of 51V(p,n) reaction is higher than that of p+209Bi reaction at proton energies below about 20 MeV. Based on these observations, conclusions are drawn about the failure of the pure equilibrium reaction in its decay to explain the experimental data in the high energy tail portion of the excitation functions, which, however, are explained by pre-equilibrium theory; about the validity of Bohr‟s theory that EQ decay takes place at lower energies for the lighter target (51V) and at lower and medium energies for the heavier target (209Bi); and about the presence of higher probability for 51V(p,n) reaction to occur compared to that of p+209Bi at proton energies below 20 MeV.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics Q Science > QD Chemistry |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 27 Jun 2018 10:00 |
| Last Modified: | 27 Jun 2018 10:00 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/5979 |
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