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/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The electron-positron pairs observed in heavy-ion collisions at Gesellschaft fuer Schwerionen-forschung Darmstadt mbH have been interpreted as the decay products of yet unknown particles with masses around 1.8 MeV. The negative results of resonant Bhabha scattering experiments, however, do not support such an interpretation. Therefore we focus on a more complex decay scenario, where the [ital e][sup +][ital e][sup [minus]] lines result from a two-collision process. We discuss the induced decay of a metastable 1[sup ++] state into [ital e][sup +][ital e][sup [minus]] pairs. For most realizations of a 1[sup ++] state such a decay in leading order can only take place in the Coulomb field of a target atom. This fact has the attractive consequence that for such a state the Bhabha bounds are no longer valid. However, the absolute value of the [ital e][sup +][ital e][sup [minus]] production cross section turns out to be unacceptably small.

physical review a

Induced decay of composite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">J</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">P</mml:mi><mml:mi mathvariant="italic">C</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>=<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo><mml:mo>+</mml:mo></mml:…

Induced decay of compositeJPC=1++