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- W1605520210 abstract "In recent times world over, there is a renewed interest in the neutron nucleus scattering data. This is owing to a new concept of controlled nuclear energy source called the accelerator driven sub-critical (ADS) system [1, 2]. In this ADS system, neutrons are produced by bombarding a heavy element target with a high energy proton beam of typically above 1.0GeV with a current of > 10mA [1]. The sub-critical reactor is driven critical by spallation neutrons produced by proton beam on typically a molten lead target. Such accelerator driven systems can also be used for waste incineration of the long lived radio active waste produced in reactors based on thermal neutron induced fission. Reactor physics calculations of these ADS type of systems require neutron-nucleus scattering cross sections up to 500 MeV neutron energy. Unlike the neutron energy spectrum from a thermal neutron fission, the spallation neutron energies reach up to several hundred MeV. Therefore, it is currently very important to study the systematics of neutron scattering cross sections on various nuclei for neutron energies up to several hundred MeV. In the present work, we performed an empirical study of the energy dependence of total cross sections (σtot) of the neutron-nucleus (n-N) scattering. It is well known that the total cross sections are explained by the nuclear Ramsauer model. The Ramsauer model was first proposed by Lawson [3] in the year 1953 to phenomenologically explain the energy dependence of total cross sections of neutron nucleus scattering. In order to have insight of the working of this model, it is necessary to understand the optical model (OM) description of neutron scattering. In the OM approach, complex optical model potentials (OMP) are used and the Schrodinger’s equation is solved to obtain the scattering amplitude. The real part of the OMP describes the scattering and the imaginary part results in attenuation or absorption of the incident wave. The reaction cross section is given by the absorption of the neutron flux. The scattering calculations are performed using partial wave expansion method and the phase shifts (ηl = αle iβl) are determined. These" @default.
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- W1605520210 date "2005-06-02" @default.
- W1605520210 modified "2023-09-27" @default.
- W1605520210 title "The Ramsauer model for the total cross sections of neutron nucleus scattering" @default.
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