Reexamination of an anomaly in near-threshold pair production

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.R5324· OSTI ID:7029645

De Braeckeleer, L; Adelberger, E G; Garcia, A ^[1]

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1. Physics Department FM-15, University of Washington, Seattle, Washington 98195 (United States)

We investigated a reported anomaly in near-threshold pair production, using radioactive sources to measure the {gamma}+Ge{r arrow}{ital e}{sup +}+{ital e}{sup {minus}}+Ge cross-section at {ital E}{sub {gamma}}=1063, 1086, 1112, 1173, 1213, 1299, 1332, and 1408 keV. Although the data agree with the theory (numerical calculations based on an exact partial-wave formulation for a screened central potential) at the higher energies, the data lie above the theory at 1063, 1082, and 1112 keV. The discrepancy is reduced by including the final-state Coulomb interaction between the {ital e}{sup +} and {ital e}{sup {minus}}.

• OSTI ID: 7029645
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:9; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

663410* -- Photonuclear Reactions & Photon Scattering-- (1992-)
663550 -- Nuclear Mass Ranges-- A=59-89-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
ENERGY RANGE
FERMIONS
GERMANIUM
INTERACTIONS
LEPTONS
MATTER
METALS
MEV RANGE
MEV RANGE 01-10
PAIR PRODUCTION
PARTICLE PRODUCTION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
POSITRONS
THRESHOLD ENERGY