Artículos de revistas
Observation of double electron-positron pair production by gamma rays reexamined
Fecha
2009Registro en:
PHYSICAL REVIEW C, v.79, n.4, 2009
0556-2813
10.1103/PhysRevC.79.048501
Autor
Maidana, Nora Lia
BRUALLA, L
Oliveira, Jose Roberto Brandao de
Rizzutto, Marcia de Almeida
Added, Nemitala
Fernández Varea, José María
Vanin, Vito Roberto
Institución
Resumen
An experiment was conducted to observe triple- and quadruple-escape peaks, at a photon energy equal to 6.128 MeV, in the spectra recorded with a high-purity Ge detector working in coincidence with six bismuth germanate detectors. The peak intensities may be explained having recourse to only the bremsstrahlung cascade process of consecutive electron-positron pair creation; i.e., the contribution of simultaneous double pair formation (and other cascade effects) is much smaller. The experimental peak areas are in reasonably good agreement with those predicted by Monte Carlo simulations done with the general-purpose radiation-tran sport code PENELOPE.