CALCULATION OF (e+, e–)-PAIR CONTRIBUTION TO THE SPECTRA OF ELECTRONS SCATTERED BY NUCLEI
Abstract
The electronuclear measurements always include the background from the (e+, e–)-pair photoproduction reaction in the target. The attempt to take into account this background through its computation by usual methods with applying the computation program GEANT-3 has appeared impractical, since it would take several years for the PC to operate. The present paper describes the technique, which permits one to reduce the time required for the PC computation of the background to a few hours. The developed technique has been verified by carrying out computations of the background from the (e+, e–)-pairs for the conditions, at which this background was measured at Saclay. The comparison between the calculated data and the experimental results has shown their agreement.
Downloads
References
GEANT 3. Detector description and simulation tool. CERN program library. 1993.
Akhiezer A.I., Berestetsky V.B. Quantum electrodynamics. – M.: State Publishing House of Technical-and-Theoretical Literature, 1953. – 428 p.
Zghiche A., Danel J.F., Bernheim M., et el. Longitudinal and transverse responses in quasi-elastic electron scattering from 208Pb and 4He // Nucl. Phys. – 1994. – Vol. A572. – P. 513-559.
Buki A.Yu., Timchenko I.S., Shevchenko N.G. Saturation of Coulomb sum rules in the 6Li case // Eur. Phys. J. – 2012. – Vol. A48 (2). – P. 17. (DOI 10.1140/epja/i2012-12017-6)
Buki A.Yu., Shevchenko N.G., Timchenko I.S. The coulomb sums for 7Li nucleus at 3-momentum transfers q = 1.250 ÷ 1.625 fm-1 // PAST. – 2009. – No.3(51). – P. 38-42.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
