MEASUREMENT OF THE ANNIHILATION-IN-FLIGHT CROSS SECTION AT 0 FOR 8.5-Mev POSITRONS

Journal Article · Sun Jan 15 04:00:00 EST 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.121.605· OSTI ID:4095226

Seward, F D; Hatcher, C R; Fultz, S C

The differential cross section at 0 deg for the annihilation in flight of 8.5-Mev positrons was measured. The positrons were created in a thick tantalum target which was bombarded by 20-Mev electrons from a linear accelerator. They were directed onto a -beryllium target where annihilation occurred, and the anihilation photons were measured by use of a thick-crystal spectrometer. The measured value for the cross section is 1.3 plus or minus 0.2 barns/steradian per electron, which is in agreement with theory. (auth)

• Research Organization: Univ. of California, Livermore
• NSA Number: NSA-15-009710
• OSTI ID: 4095226
• Report Number(s): UCRL-6043; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 121; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ANNIHILATION
BERYLLIUM
CROSS SECTIONS
CRYSTALS
ELECTRONS
ENERGY RANGE
GAMMA SPECTROMETERS
IRRADIATION
LINEAR ACCELERATORS
MEASURED VALUES
PHOTONS
PHYSICS
POSITRONS
PRODUCTION
TANTALUM
TARGETS