Observation of double electron-positron pair production by {gamma} rays reexamined

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.048501· OSTI ID:21286914

Maidana, N L; Oliveira, J R. B.; Rizzutto, M A; Added, N; Vanin, V R ^[1]; Brualla, L ^[2]; Fernandez-Varea, J M ^[3]

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1. Instituto de Fisica, Universidade de Sao Paulo, Travessa R 187, Cidade Universitaria, CEP: 05508-900 Sao Paulo, SP (Brazil)
2. NCTeam, Strahlenklinik, Universitaetsklinikum Essen, Hufelandstrasse 55, D-45122 Essen (Germany)
3. Facultat de Fisica (ECM), Universitat de Barcelona, Diagonal 647, E-08028 Barcelona (Spain)

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-transport code PENELOPE.

• OSTI ID: 21286914
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 79, Issue 4; Other Information: DOI: 10.1103/PhysRevC.79.048501; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BGO DETECTORS
BREMSSTRAHLUNG
COMPUTERIZED SIMULATION
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ESCAPE PEAKS
GAMMA RADIATION
HIGH-PURITY GE DETECTORS
MEV RANGE 01-10
MONTE CARLO METHOD
PAIR PRODUCTION
PHOTONS
POSITRONS
RADIATION TRANSPORT
SPECTRA