Improved low-energy absolute pair-production cross-section measurements in targets of Z = 26, 29, 50, 82, and 92

Journal Article · Sun Aug 01 04:00:00 EDT 1982 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.26.825· OSTI ID:5012895

Khalil, A E

Absolute cross sections for the production of electron-positron pairs by photons incident on targets of iron, copper, tin, lead, and uranium were measured using an improved internal source spectrometer which employs two large intrinsic Ge detectors. The measurements were made for 2.615 MeV and a mixture of 1.1732- and 1.3325-MeV ..gamma.. rays in the decays of /sup 228/Th and /sup 60/Co respectively. The results are in excellent agreement with theory and clearly indicate that there are no deviations of the experimental cross sections from theory, of more than a few percent, down to the effective energy of the /sup 60/Co ..gamma.. rays. The results also indicate that the improved spectrometer should yield cross sections near threshold with far smaller uncertainties than those measured with the older version.

• Research Organization: Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208
• OSTI ID: 5012895
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 26:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

654001* -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
COPPER
CROSS SECTIONS
ELECTRON PAIRS
ELEMENTARY PARTICLES
ELEMENTS
INTERACTIONS
IRON
LEAD
MASSLESS PARTICLES
METALS
NEUTRAL-PARTICLE TRANSPORT
PAIR PRODUCTION
PHOTON TRANSPORT
PHOTONS
RADIATION TRANSPORT
TIN
TRANSITION ELEMENTS
URANIUM