Investigations of Positronium Formation and Destruction Using3γ/2γAnnihilation-Ratio Measurements

Autor:	E. G. Miller, Eugene Surdutovich, W. E. Kauppila, T. S. Stein, K. Pipinos, H. F. M. Mohamed
Rok vydání:	2004
Předmět:	Physics Annihilation Scattering Astrophysics::High Energy Astrophysical Phenomena Gamma ray General Physics and Astronomy chemistry.chemical_element Electron Kinetic energy Positronium Positron chemistry Aluminium Physics::Atomic and Molecular Clusters Atomic physics
Zdroj:	Physical Review Letters. 93
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.93.113401
Popis:	Positronium (Ps) produced by 4 to 40 eV positrons colliding with Ne, Ar, Kr, CO2, and O2 is investigated by measuring the ratio of signals of two gamma rays in coincidence resulting from (a) three gamma annihilation of ortho-Ps and (b) two annihilation gamma rays due to para-Ps decay and destruction of ortho-Ps at an aluminum scattering cell surface. These ratios provide evidence that relates to the kinetic energy dependence of ortho-Ps interactions with an aluminum surface, the Ps formation potential at this surface, and the fact that Ps is being formed with inner orbital electrons for CO2 and O2.
Databáze:	OpenAIRE
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