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Suppression of soft nuclear bremsstrahlung in proton-nucleus collisions

M. J. van Goethem·L. Aphecetche·J. C. S. Bacelar·H. Delagrange·J. Diaz·D. d'Enterria·M. Hoefman·R. Holzmann·H. Huisman·N. Kalantar--Nayestanaki·A. Kugler·H. Loehner·G. Martinez·J. G. Messchendorp·R. W. Ostendorf·S. Schadmand·R. H. Siemssen·R. S. Simon·Y. Schutz·R. Turrisi·M. Volkerts·H. W. Wilschut
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Abstract

Photon energy spectra up to the kinematic limit have been measured in 190 MeV proton reactions with light and heavy nuclei to investigate the influence of the multiple-scattering process on the photon production. Relative to the predictions of models based on a quasi-free production mechanism a strong suppression of bremsstrahlung is observed in the low-energy region of the photon spectrum. We attribute this effect to the interference of photon amplitudes due to multiple scattering of nucleons in the nuclear medium.

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M. J. van Goethem, L. Aphecetche, J. C. S. Bacelar, H. Delagrange, J. Diaz, D. d'Enterria, M. Hoefman, R. Holzmann, H. Huisman, N. Kalantar--Nayestanaki, A. Kugler, H. Loehner, G. Martinez, J. G. Messchendorp, R. W. Ostendorf, S. Schadmand, R. H. Siemssen, R. S. Simon, Y. Schutz, R. Turrisi, M. Volkerts, H. W. Wilschut. 2001-11-30. Suppression of soft nuclear bremsstrahlung in proton-nucleus collisions. https://doi.org/10.1103/physrevlett.88.122302

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