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 Plus

Presents the access of premium content as premium feature

Premium Content

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

Zendy Tools

Zendy Open

Coherent photoproduction of $\eta$-mesons off $^3$He, i.e. the reaction$\gamma ^3{He}\rightarrow \eta ^3{He}$, has been investigated in thenear-threshold region. The experiment was performed at the Glasgow taggedphoton facility of the Mainz MAMI accelerator with the combined Crystal Ball -TAPS detector. Angular distributions and the total cross section were measuredusing the $\eta\rightarrow \gamma\gamma$ and $\eta\rightarrow 3\pi^0\rightarrow6\gamma$ decay channels. The observed extremely sharp rise of the cross sectionat threshold and the behavior of the angular distributions are evidence for astrong $\eta {^3{He}}$ final state interaction, pointing to the existence of aresonant state. The search for further evidence of this state in the excitationfunction of $\pi^0$-proton back-to-back emission in the $\gamma^3{He}\rightarrow \pi^0 pX$ reaction revealed a very complicated structure ofthe background and could not support previous conclusions.

Coherent photoproduction of eta-mesons off 3He - search for eta-mesic nuclei