The diBerential cross section for bremsstrahlung derived in the previous paper is integrated over the direction of the emerging electron. It is found that regions of appreciable polarization occur near both the low energy and high energy ends of the photon spectrum. Calculations are performed for the polarization dependence of the radiation for incident electrons of about 0.1, 0.5, 2.5 Mev with and without approximate shielding corrections calculated for aluminum. The polarization dependence of the differential cross section for pair production and of the cross section integrated over either the electron or positron direction is obtained from the results for bremsstrahlung by the weH-known procedure of changes from positive to negative energy state.
The dependence of the differential cross section for bremsstrahlung on photon polarization is calculated in the same approximation as the Bethe-Heitler formula for the sum over polarizations. The radiation is found to consist of a mixture of an unpolarized and a linearly polarized component. The relation of the method of intermediate states to the method of transitions between stationary states is explicitly stated.* Assisted by the joint program of the U. S.
A discussion of the unitary-model-operator approach to the correlation problem in nuclei is presented and some calculational detials are discussed. The renormalization of the tensor force is carried out in second-order perturbation theory after the introduction of a set of correlated basis functions. It is indicated that the application of the Hartree-Fock method to the resulting effective Hamiltonian extends the range of application of the theory for which a degree of self-consistency in the calculations may be achieved.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.