Aufsatz
Molecular effects on the cross section for pair production and their importance in the evaluation of the total photonuclear cross section of {^16}O in the {\delta-resonance} region
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 {\delta-resonance} region.
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 {\delta-resonance} region.
Citation
In: Nuclear physics / A. Amsterdam : North-Holland Publ. 490 (1988), S. 655 - 666Sponsorship
Supported by Deutsche Forschungsgemeinschaft (SFB 201 and contract Schu 222/6-2)Citation
@article{urn:nbn:de:hebis:34-2008092223876,
author={Ahrens, J. and Gimm, H. and Beuermann, T. and Rullhusen, P. and Schumacher, M. and Fricke, Burkhard and Sepp, Wolf-Dieter},
title={Molecular effects on the cross section for pair production and their importance in the evaluation of the total photonuclear cross section of {^16}O in the {\delta-resonance} region},
year={1988}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 1988$n1988 1500 1/eng 2050 ##0##urn:nbn:de:hebis:34-2008092223876 3000 Ahrens, J. 3010 Gimm, H. 3010 Beuermann, T. 3010 Rullhusen, P. 3010 Schumacher, M. 3010 Fricke, Burkhard 3010 Sepp, Wolf-Dieter 4000 Molecular effects on the cross section for pair production and their importance in the evaluation of the total photonuclear cross section of {^16}O in the {\delta-resonance} region / Ahrens, J. 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/urn:nbn:de:hebis:34-2008092223876=x R 4204 \$dAufsatz 4170 7136 ##0##urn:nbn:de:hebis:34-2008092223876
2008-09-22T08:47:20Z 2008-09-22T08:47:20Z 1988 0375-9474 urn:nbn:de:hebis:34-2008092223876 http://hdl.handle.net/123456789/2008092223876 Supported by Deutsche Forschungsgemeinschaft (SFB 201 and contract Schu 222/6-2) 591001 bytes application/pdf eng Urheberrechtlich geschützt https://rightsstatements.org/page/InC/1.0/ 530 Molecular effects on the cross section for pair production and their importance in the evaluation of the total photonuclear cross section of {^16}O in the {\delta-resonance} region Aufsatz 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 {\delta-resonance} region. open access In: Nuclear physics / A. Amsterdam : North-Holland Publ. 490 (1988), S. 655 - 666 Ahrens, J. Gimm, H. Beuermann, T. Rullhusen, P. Schumacher, M. Fricke, Burkhard Sepp, Wolf-Dieter
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