Measurement of the exclusive D(p,e(+)e(-))He-3 and D(p,gamma)He-3 reactions at 98 and 176 MeV

R Johansson*, TB Bright, G Faldt, B Hoistad, E Traneus, J Bacelar, H Huisman, N Kalantar-Nayestanaki, JG Messchendorp, M Seip

*Corresponding author for this work

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Abstract

A high resolution magnetic pair spectrometer for medium energy photons has been used for studies of the exclusive (p,e(+)e(-)) and (p, gamma) reactions on deuterium at 98 and 176 MeV. The (p, e(+)e(-)) cross sections, obtained at 40 degrees and 80 degrees, are compared with the corresponding data for the (p, gamma) reaction measured with the same apparatus. At small virtual photon masses the (p, e(+)e(-)) cross sections show significant enhancement over what is expected from model calculations, a behaviour which has earlier been observed also for the B-11(p, e(+)e(-))C-12 reaction. (C) 1998 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)389-400
Number of pages12
JournalNuclear Physics A
Volume641
Issue number4
Publication statusPublished - 26-Oct-1998

Keywords

  • H-2(p,gamma)
  • (p, e(+)e(-))He-3
  • E = 98
  • 176 MeV
  • measured sigma(theta)
  • deduced enhancement in pair production
  • internal pair production
  • ratio of exclusive differential cross sections
  • high resolution magnetic pair spectrometer
  • RADIATIVE PROTON CAPTURE
  • INTERMEDIATE ENERGIES
  • DISCRETE STATES

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