Elsevier

Nuclear Physics A

Volume 490, Issue 3, 26 December 1988, Pages 655-666
Nuclear Physics A

Molecular effects on the cross section for pair production and their importance in the evaluation of the total photonuclear cross section of 16O in the Δ-resonance region☆

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Abstract

The screening correction to the coherent pair-production cross section on the oxygen molecule has been calculated using self-consistent relativistic wave functions for the one-center and two-center Coulomb potentials. It is shown that the modification of the wave function due to molecular binding and the interference between contributions from the two atoms have both sizeable effects on the screening correction. The so-obtained coherent pair-production cross section which makes up the largest part of the total atomic cross section was used to evaluate the total nuclear absorption cross section from photon attenuation measurements on liquid oxygen. The result agrees with cross sections for other nuclei if A-scaling is assumed. The molecular effect on the pair cross section amounts to 15% of the nuclear cross section in the Δ-resonance region.

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Cited by (5)

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    1993, Nuclear Physics, Section A

  • Total photonuclear absorption cross sections above the pion threshold

    1993, Radiation Physics and Chemistry

  • Interaction of real photons with nuclei from 100 to 500 MeV

    1992, Nuclear Physics, Section A

  • Two and three nucleon induced photon absorption

    1996, Physical Review C - Nuclear Physics

  • Inclusive eta photoproduction in nuclei

    1993, Physical Review C
☆

Supported by Deutsche Forschungsgemeinschaft (SFB 201 and contract Schu 222/6-2).

1

The calculations described in this paper were partly a subject of T. Beuermann's Diploma Thesis (1987).

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