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Positron binding: A positron-density viewpoint
Physical Review A, 1994The binding of a single positron to a many-electron system (in the field of a fixed nuclear configuration) is viewed in terms of positron and electron densities. Following the treatments due to Levy and co-workers [Phys. Rev. A 32, 2010 (1985); 30, 2745 (1984)], certain general integral conditions and also an exact differential equation for the ...
, Baruah, , Zope, , Kshirsagar, , Pathak
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An anomalous positron abundance in cosmic rays with energies 1.5–100 GeV
Nature, 2009Positrons are known to be produced in interactions between cosmic-ray nuclei and interstellar matter ("secondary production"). Positrons may, however, also be created by dark matter particle annihilations in the galactic halo or in the magnetospheres of ...
O. Adriani +50 more
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Positron profiles and positron annihilation in thin layers
physica status solidi (a), 1982The moderated positron density distribution over the sample depth is properly calculated. The results obtained are used as the basis for the positron annihilation probability in thin foils and surface layers. The annihilation photon angular distribution (APAD) for the double-layer samples is measured.
A. D. Pogrebnyak +2 more
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Positron diffusion in Mo: The role of epithermal positrons
Physical Review B, 1987Positrons at keV energies, incident on Mo(111) are observed to escape the sample prior to thermalization. Analysis of positron back-diffusion data shows that an excess contribution of ``hot'' positronium (Ps) seriously affects positron mobility measurements. Suppressing the ``hot'' Ps fraction the positron diffusion coefficient is shown to vary as ${T}^
, Huomo +3 more
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Positron-atom and positron-molecule collisions
Physics Reports, 1982Abstract The scattering of positrons by atoms and molecules is reviewed. The recent development of monoenergetic slow positron beams and their applications to the measurement of cross sections for positrons interacting in various gases are discussed briefly.
A.S. Ghosh, N.C. Sil, P. Mandal
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The International Journal of Applied Radiation and Isotopes, 1960
Abstract Short-lived Ga68 can be prepared from its long-lived parent, Ge68, thus providing a convenient source of positron-emitting activity for medical or other applications. Solvent extraction is used for the rapid separation of the gallium daughter and a method for the production of the germanium parent is given.
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Abstract Short-lived Ga68 can be prepared from its long-lived parent, Ge68, thus providing a convenient source of positron-emitting activity for medical or other applications. Solvent extraction is used for the rapid separation of the gallium daughter and a method for the production of the germanium parent is given.
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Annual Review of Neuroscience, 1980
An understanding of disease processes in the human brain must ultimately be based on a knowledge of the underlying regional hemodynamic, metabolic, and biochemical changes. Although some such information is currently available from various animal models, the conflicting nature of these data often leaves many important questions unanswered and ...
M M, Ter-Pogossian +2 more
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An understanding of disease processes in the human brain must ultimately be based on a knowledge of the underlying regional hemodynamic, metabolic, and biochemical changes. Although some such information is currently available from various animal models, the conflicting nature of these data often leaves many important questions unanswered and ...
M M, Ter-Pogossian +2 more
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Probing Biomembranes with Positrons
The Journal of Physical Chemistry B, 2009Free volume pockets inside a cell membrane play a prominent role in a variety of dynamic processes such as the permeability of small molecules across membranes and the diffusion of, e.g., lipids, drugs, and electron carriers in the plane of the membrane.
Petri, Sane +6 more
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