Proton-proton bremsstrahlung cross-sections including the kinematical singularity

• Published in: The European physical journal. A, Hadrons and nuclei Vol. 41; no. 1; pp. 25 - 29
• Main Authors: Mahjour-Shafiei, M., Amir-Ahmadi, H. R., Bacelar, J. C. S., Castelijns, R., Ermisch, K., van Garderen, E. D., Gašparić, I., Harakeh, M. N., Kalantar-Nayestanaki, N., Kiš, M., Löhner, H., Scholten, O.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01-07-2009; Springer
• Subjects: Exact sciences and technology; Hadrons; Heavy Ions; Nuclear Fusion; Nuclear Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Regular Article - Experimental Physics; 25.10.+s Nuclear reactions involving few-nucleon systems; 25.20.Lj Photoproduction reactions; 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.); Protons; Singularity; Numerical integration; Bremsstrahlung; Models; Phase space; Cross sections
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/i2009-10786-5

Integrated cross-section data for proton-proton bremsstrahlung including the points with the phase-space singularity, which occurs close to the maximum non-coplanarity angle, are presented. A numerical integration of theoretical cross-sections is performed over the non-coplanarity angle to integrate out this singularity. Furthermore, a comparison is made between measured cross-sections and predictions of two soft-photon models. All features observed for the data far from the singularity, including the overestimation of the cross-section by
30% by the theoretical calculations, emerge as well for the data close to and including the singularity.