J. Phys. Radium 23, 989-992 (1962)
DOI: 10.1051/jphysrad:019620023012098900

Sections efficaces des réactions (γ, p) produites par des rayons γ de 14.8 et 17.6 MeV sur les éléments Al, Ni, Cu et Ag

W. Sebaoun

Laboratoire Joliot-Curie de Physique Nucléaire, Orsay (S.-et-O.)

Abstract
The cross-sections of (γ, p) reactions induced on Al, Ni, Cu and Ag by the γ radiation from the 7Li (p, γ) reaction have been measured relatively to the known cross-section σ0 of the 63Cu (γ, n) reaction. Assuming for σ0 the value (82 ± 8) mbarns, the obtained cross-sections are : σ(Al) = (7.2 ± 1,1) mbarns, σ(Ni) = (43 ± 5) mbarns, σ(Cu) = (9.8 ± 1.4) mbarns, σ(Ag) = (6.2 ± 0.9) mbarns. These results have been used to compare the ratios σp/σn of the cross-sections for the (γ, p) and (γ, n) reactions on Ni, Cu and Ag, with the data from the statistical theory.

Résumé
Les sections efficaces des réactions (γ, p) produites sur les éléments Al, Ni, Cu et Ag par le rayonnement γ de la réaction 7 Li (p, γ) ont été mesurées par comparaison avec la section efficace σ0 de la réaction 63Cu (γ, n). En retenant pour σ0 la valeur (82 ± 8) mbarns, les sections efficaces obtenues sont σ(Al) = (7,2 ± 1,1) mbarns, σ(Ni) = (43 ± 5) mbarns, a(Cu) = (9,8 ± 1,4) mbarns, σ(Ag) = (6,2 ± 0,9) mbarns. Ces résultats ont été utilisés pour comparer les rapports σp/σn des sections efficaces des réactions (γ, p) et (γ, n), pour les éléments Ni, Cu et Ag, avec les prévisions de la théorie statistique.

PACS
2320 - Electromagnetic transitions.

Key words
nuclear reactions and scattering due to photons

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