MOMENTUM DISTRIBUTIONS OF PHOTONS FROM POSITRONS ANNIHILATING IN ALKALI HALIDES

Journal Article · Thu Dec 15 04:00:00 EST 1960 · Physical Review (U.S.) Superseded in part by Phys.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.120.2033· OSTI ID:4121540

Stewart, A T; Pope, N K

The angular correlation of photons from the two- gamma decay of positrons in all sodium halides and all alkali chlorides was measured. The data yield the momentum distribution of the two gamma rays which is also the momentum distribution of the annihilating electron-positron pairs. It is seen that the positive ion has very little influence on the momentum distribution in comparison with the negative ion. The distributions in momentum are compared with the distributions calculated from various models of electron and positron wave functions in the crystal. For fluorides and chlorides, the electron- positron wave-function products that yield fits to the experimental data resemble HartreeFock free-ion electron wave functions. Both the wavefunction products and the free-ion wave functions yield density distributions that are similar to the electron densities obtained by x-ray measurements. This conclusion makes improbable a model of single-particle wave functions, describing both the electrons and the positron tightly bound to the negative ion. (auth)

• Research Organization: Atomic Energy of Canada Ltd., Chalk River, Ont.
• NSA Number: NSA-15-006654
• OSTI ID: 4121540
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALKALI METALS
ANGULAR DISTRIBUTION
ANNIHILATION
CHLORIDES
DECAY
DENSITY
DISTRIBUTION
ELECTRONS
GAMMA RADIATION
HALIDES
HARTREE- FOCK METHOD
IONS
MEASURED VALUES
MOMENTUM
PHOTONS
PHYSICS
POSITRONS
QUANTUM MECHANICS
SODIUM