English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We consider the cross section of electron-positron pair production by ahigh-energy photon in a strong Coulomb field close to the end of electron orpositron spectrum. We show that the cross section essentially differs from theresult obtained in the Born approximation as well as form the result whichtakes into account the Coulomb corrections under assumption that both electronand positron are ultrarelativistic. The cross section of bremsstrahlung in astrong Coulomb field by a high-energy electron is also obtained in the regionwhere the final electron is not ultrarelativistic.

High-energy $e^+e^-$ photoproduction cross section close to the end of spectrum