Access the full text.
Sign up today, get DeepDyve free for 14 days.
References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.
Scattering of orthopositronium off helium target has been investigated using close-coupling method in the energy range 0–110 eV. Two basis sets, (a) Ps ( 1 s ) + He ( 1 s 2 , 1 s 2 1 s , 1 s 2 1 p ) and (b) Ps ( 1 s , 2 p ) + He ( 1 s 2 , 1 s 2 1 s , 1 s 2 1 p ) , have been employed to find the scattering parameters. Low-order phase shifts, scattering length, and elastic and excitation cross section up to n = 2 are reported using close-coupling approximation. Total cross section is also given by adding other partial cross section and compared with available measured data and existing theoretical predictions. Our total cross section at zero energy is very close to the theoretical prediction of Drachman and Houston J. Phys B 3 , 1657 (1970) and measured data of Canter et al. Phys. Rev. A 12 , 375 (1975). Present total cross section is in qualitative agreement with measured data of the University College London group in the energy range considered. In particular, present predictions are in good agreement with the UCL group in the energy range 20–30 eV. It has been found that elastic cross section is dramatically reduced, at zero or near zero energies, with the inclusion of target excitation in the expansion scheme. Moreover, ionization cross section of the Ps atom is found to be a major contributor to the total cross section above the ionization threshold.
Physical Review A – American Physical Society (APS)
Published: May 1, 2001
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.