Differential elastic scattering cross sections for 54.9eV positrons incident on helium

Details Differential elastic scattering cross sections for 54.9eV positrons incident on helium Differential elastic scattering cross sections for 54.9eV positrons incident on helium

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058..117c&link_type=abstract

In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 117-119 (SEE N90-18957 11-70)

Physics

Elastic Scattering, Helium, Positrons, Scattering Cross Sections, Curve Fitting, High Resolution, Time Of Flight Spectrometers

Scientific paper

Absolute differential elastic scattering cross sections measured with the 3-m, high resolution, time-of-flight spectrometer are presented for 54.9eV positrons incident on He. Five point moving average differential cross sections are plotted against average scattering angles which range from 14 to 36 deg. Also the averages of five differential cross sections which have adjacent values of scattering angle are plotted versus the corresponding averages of the scattering angles. The curve fitted to these data is shaped like the theoretical curve but has its minimum and its maximum at scattering angles that are about 4 deg higher and 15 deg lower respectively than predicted by theory.

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