Screening effects in pair production by 10-MeV photons on uranium atoms

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.1309· OSTI ID:7160621

Tseng, H K ^[1]

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1. Department of Physics, National Central University, Chung-Li, Taiwan 32054 (Taiwan, Province of China)

With a partial-wave interpolation method we calculated the positron energy spectra of pair production in the field of uranium atoms for photons of energy [ital k]=10 MeV, permitting a comparison of theory with the recent experiment. Our results show that the atomic-electron screening effect decreases the cross section for the main region of the positron energy spectra which contributes to the total pair-production cross section, and the effect can be as large as about 9% for the region of low positron energies which contributes little to the total pair-production cross section. The screening effect to the total pair-production cross section is about 3.5%. Our results also indicate that the approximate treatment of screening through energy-shift screening theory becomes inadequate at this intermediate photon energy, while the approximate treatment of screening through form-factor screening theory is quite good. Our result for the total pair-production cross section is compared with the experimental result.

• OSTI ID: 7160621
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:2; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
664500 -- Special Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDES
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
FERMIONS
INTERACTIONS
INTERPOLATION
LEPTON-LEPTON INTERACTIONS
LEPTONS
MATTER
METALS
MEV RANGE
NUMERICAL SOLUTION
PAIR PRODUCTION
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
POSITRONS
SENSITIVITY
SPECTRA
URANIUM