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dc.contributor.authorMohammed Ali, Akram-
dc.date.accessioned2022-12-05T17:52:27Z-
dc.date.available2022-12-05T17:52:27Z-
dc.date.issued2014-06-20-
dc.identifier.urihttp://localhost:8080/xmlui/handle/123456789/9142-
dc.description.abstract"Abstract Pre-equilibrium model that used in the present work is a statistical approach using exciton model formulated originally just for nucleon emission and extended to include also emission of light clusters. Several mechanisms in which α-particle formation that content in some models as Iwamoto-Harada and Kalbach were discussed well means of cross sections of reactions. In this work we study the cross sections of several types of reactions induced by a nucleon (proton or neutron) with a wide range of incident energies. As α-particle consist of four nucleon, it has a such configurations that form the particle-hole pairs and by testing the partial level densities on these pairs, the Ericson and William’s formula are used to display the effect of single-particle state density (g) and the excitation energy on these configurations for one and two components, It is found from the results that as the excitation energy increases the state density values increases which is back to the availability of more degree of degeneracy for each state. More correction added lead to decreases the state density values due to the decrement in the effective excitation energy. By using the different forms of level density parameter ( a ) we calculate the partial level density. Adding the spin function R(J) to the subprogram code of PRECO6 to testing the influence of this function on the cross section, three (p,α) reactions at energy 62 MeV are chosen and the introduction of spin increases the cluster spectra significantly. Discussion the effect of spin function as correction on state density, the 56Fe and 208Bi nucleus was chose to in an reaction with maximum excitation energy (100 MeV), The values of angular momentum J that take as (1, 2, 3, 4 ) was applied on state densities that calculate by different formula. For system described by two component square matrix element, different expressions for the matrix present but comparison between two main formula are made. Old expression is given by Kalbach work in the low energy range ~ 100MeV and other work in the high energy (7-200) MeV and found increasing of incident energies lead matrix element to produce more and more scattering then more complex excitation states. The results obtained for 56Fe(p,α) reaction. A comparison between two main models that discussed the cross section of alpha cluster formation , IH and Kalbach [Preco6 program], were made at different range of energies with different nucleus. In order to compare results with experimentally measurement from EXFOR cross sections it is found approved good match with experimental in pre-equilibrium stage, all calculations were performed for some testing using FORTRAN language. "en_US
dc.publisherالعراق . جامعة بغدادen_US
dc.subjectPre-equilibrium model, Iwamoto-Harada, α-particle, partial level densities, level density parameteren_US
dc.titleCross Section Calculations for ( N, α ) Reactions of some Nucleien_US
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