Doppler Broadening of In-Flight Positron Annihilation Radiation due to Electron Momentum | Zendy

A. Hunt | Zendy; D. B. Cassidy | Zendy; P. A. Sterne | Zendy; T. E. Cowan | Zendy; R. H. Howell | Zendy; K. G. Lynn | Zendy; J. A. Golovchenko | Zendy

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Doppler Broadening of In-Flight Positron Annihilation Radiation due to Electron Momentum

Author(s) -

A. Hunt,

D. B. Cassidy,

P. A. Sterne,

T. E. Cowan,

R. H. Howell,

K. G. Lynn,

J. A. Golovchenko

Publication year - 2001

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.86.5612

Subject(s) - doppler broadening , annihilation , physics , electron , annihilation radiation , positron , atomic physics , radiation , nuclear physics , photon , core electron , polarization (electrochemistry) , doppler effect , momentum (technical analysis) , spectral line , positron annihilation , optics , chemistry , finance , astronomy , economics

We report the first observation of electron momentum contributions to the Doppler broadening of radiation produced by in-flight two-photon annihilation in solids. In these experiments an approximately 2.5 MeV positron beam impinged on thin polyethylene, aluminum, and gold targets. Since energetic positrons easily penetrate the nuclear Coulomb potential and do not cause a strong charge polarization, the experimental annihilation line shapes agree well with calculations based on a simple independent-particle model. Moreover, annihilations with the deepest core electrons are greatly enhanced.

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