Abstract
Elastic proton scattering at energies between 160 and 800 MeV from 58Ni and 90Zr has been studied within the global Dirac optical model. In this work we calculate potential parameters which give good fits to the experimental data using parameterization code comprising differential cross section and analysing power measurements using DWUCK4. The real and imaginary potentials are well determined and behave regularly with energy. The behaviour of the real central effective potential shows the development of a wine-bottle shape in the transition energy region and the persistence of a small attractive potential in the nuclear surface region, even at 800 MeV.
Highlights
In the last several years, a large number of experimental data, on proton elastic scattering at intermediate energies (∼150 MeV-1 GeV) were published
First we start with a discussion of the results for the differential cross sections and the analysing powers obtained within the global approaches for 58Ni and 90Zr respectively
The global fits to the differential cross sections are very good for both targets at all energies. the analysing power, is sensitive to the type of the applied models
Summary
In the last several years, a large number of experimental data, on proton elastic scattering at intermediate energies (∼150 MeV-1 GeV) were published They prompted several global analyses of this scattering process in the framework of the relativistic optical model potential. The relativistic optical model potential[1,2,3,4], not discussed here in detail, is taken to be a sum of a Lorentz scalar potential and the time-like component of a vector potential With such a relativistic potential a Dirac equation is solved numerically in order to calculate the elastic scattering observables. Around 300 Mev, the real part of the central potential has a pronounced shape takes the form of a repulsive core surrounded by an attractive part[2,3] This requirement for a repulsive core seems to be less obvious for light target nuclei such as 4He[5]. The purpose of this work is to extend the global relativistic optical model analyses to a larger number of target nuclei, in particular heavier ones, in order to find more about the behaviour of optical model potential at different energies and for different mass numbers
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