Abstract
We calculate the differential cross section for nucleonnucleon bremsstrahlung in covariant way based on a realistic meson-exchange approximation for the NN-scattering amplitude. The results are discussed in comparison to semiclassical approximations and with respect to the role of internal radiation diagrams. The influence of the anomalous magnetic moment on the proton-neutron bremsstrahlung is found to contribute up to 50% for specific kinematical conditions. Recent measurements on the elementary differential cross sectionpn→pnγ are found to be quite accurately reproduced. Furthermore, for use in proton-nucleus and nucleus-nucleus collisions, we present a parametrization of thepnγ cross section within a broad kinematical range.
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Brown, V.R., Franklin, J.: Phys. Rev. C8, 1706 (1973); Bohannon, G.E., Heller, L., Thompson, R.H.: Phys. Rev. C16, 284 (1977)
Kitching, P., Hutcheaon, D.A. et al.: Nucl. Phys. A463, 87c (1988)
Fearing, H.W.: Nucl. Phys. A463, 95c (1988)
Metag, V.: Nucl. Phys. A488, 483c (1988)
Bauer, W., Bertsch, G.F., Cassing, W., Mosel, U.: Phys. Rev. C34, 2127 (1986); Biró, T.S., Niita, K., Paoli, A.L. De, Bauer, W., Cassing, W., Mosel, U.: Nucl. Phys. A475, 579 (1987); Niita, K., Paoli, A.L. De, Bauer, W., Biró, T.S., Cassing, W., Mosel, U.: Nucl. Phys. A482, 525c (1988); Ko, C.M., Aichelin, J.: Phys. Rev. C35, 1976 (1987)
Roche, G., Krebs, G.F. et al.: Nucl. Phys. A488, 477c (1988);
Gale, C., Kapusta, J.: Phys. Rev. C35, 2107 (1987); Xia, L.H., Ko, C.M., Xiong, L., Wu, J.Q.: Nucl. Phys. A485, 721 (1988);
Schäfer, M., Biró, T.S., Cassing, W., Mosel, U.: Phys. Lett. B221, 1 (1989)
Horowitz, C.F.: Phys. Rev. C31, 1340 (1985); Murdock, D.P., Horowitz, C.F.: Phys. Rev. C35, 1442 (1987)
Nakayama, K.: Phys. Rev. C39, 1475 (1989)
Itzykson, C., Zuber, J.-B.: Quantum field theory. New York: McGraw Hill 1985
Bjorken, J.D., Drell, S.D.: Relativistic quantum mechanics. New York: McGraw Hill 1964
Towner, I.S.: Phys. Rep.155, 263 (1987)
Baier, R., Kühnelt, H., Urban, P.: Nucl. Phys. B11, 675 (1969)
Villars, F.: Helv. Phys. Acta20, 476 (1947)
Riska, D.O., Brown, G.E.: Phys. Lett.38B, 193 (1972); Gari, M., Hyuga, H.: Z. Phys. A — Atoms and Nuclei277, 291 (1976);
Friar, J.L.: Ann. Phys.104, 380 (1977); Friar, J.L.: Nucl. Phys. A264, 455 (1976)
Wahlborn, S., Blomqvist, M.: Nucl. Phys. A133, 50 (1969)
Niita, K., Biró, T.S., Cassing, W., Paoli, A.L. De, Mosel, U., Schäfer, M.: Nucl. Phys. A495, 91c (1989)
Jackson, J.D.: Classical electrodynamics. New York: Wiley 1962
Neuhauser, D., Koonin, S.E.: Nucl. Phys. A462, 163 (1987)
Malfliet, R.: Prog. Part. Nucl. Phys.21, 207 (1988); Schmidt, M., Röpke, G., Schulz, H.: Ann. Phys.202, 57 (1990)
Nifenecker, H., Pinston, J.A.: High energy photon production in nuclear reactions, ISN preprint 1990
Koehler, P.F.M., Rothe, K.W., Thorndike, E.H.: Phys. Rev. Lett.18, 933 (1967)
Edgington, J.A., Rose, B.: Nucl. Phys.89, 523 (1966)
Nakayama, K.: Private communication
Brady, F.P., Young, J.C.: Phys. Rev. C2, 1597 (1970); Brady, F.P., Young, J.C.: Phys. Rev. C7, 1707 (1973)
Nifenecker, H., Kwato Njock, M., Pinston, J.A.: Nucl. Phys. A495, 3c (1989)
Pinston, J.A., Barneoud, D., Bellini, V., Drissi, S., Guillot, J., Julien, J., Nifenecker, H., Schussler, F.: Phys. Lett.249B, 402 (1990)
Niita, K., Cassing, W., Mosel, U.: Nucl. Phys. A504, 391 (1989)
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Work supported by BMFT, GSI Darmstadt and a NATO science grant
The authors acknowledge valuable discussions with G.F. Bertsch, K. Nakayama and J. Kapusta. They also like to thank M. Durand for many interesting discussions and access to her results prior to publication. These contact were greatly facilitated by support from the PROCOPE program.