Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-07-11
Nucl.Phys. A593 (1995) 377-398
Physics
Nuclear Physics
Nuclear Theory
LaTeX, 31 pages including 5 uuencoded figures in eps files. Accepted for publication in Nuclear Physics A
Scientific paper
10.1016/0375-9474(95)00329-Y
The relativistic amplitude for the direct knock-out contribution to $\left( \gamma, p \right)$ reactions on nuclei is reduced to a nonrelativistic form using an effective Pauli reduction scheme. The reduction is carried out to second order in the inverse nucleon mass. It is found that the interaction Hamiltonian appearing in the nonrelativistic amplitude has significant dependence, starting at second order, on the vector and scalar mean nuclear potentials. These strong medium modifications are absent in traditional nonrelativistic calculations. Detailed comparisons show that these modifications are crucial to understanding the differences between relativistic and nonrelativistic models. These differences are also examined through reduction of the relativistic amplitude via the Foldy-Wouthuysen transformation. Similar medium modifications are obtained in this case as well. We discuss the implications of these medium modifications for the consistency of existing nonrelativistic calculations.
Hedayati-Poor M.
Johansson J. I.
Sherif Helmy S.
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