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arxiv: nucl-ex/0111021 · v1 · submitted 2001-11-30 · ⚛️ nucl-ex

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
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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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keywords photonbremsstrahlungnuclearproductionsuppressionamplitudesattributebeen
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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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