Naslov
Coherent photoproduction of η-mesons off 3He – search for η-mesic nuclei

Autori
Pheron, F. ; ... ; Korolija, Milorad, ... ; Mekterović, Darko ; ... ; Mićanović ; Saša ; ... ; Supek, Ivan ; ... ; Zehr, F.

Izvornik
Physics letters. B (0370-2693) 709 (2012), 1/2; 21-27

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
total cross section ; photoproduction ; eta meson ; final-state interaction ; Crystal Ball ; MAMI

Sažetak
Coherent photoproduction of η-mesons off 3He, i.e. the reaction γ3He→η3He, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball – TAPS detector. Angular distributions and the total cross section were measured using the η→γγ and η→3π0→6γ decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of π0-proton back-to-back emission in the γ3He→π0pX reaction revealed a very complicated structure of the background and could not support previous conclusions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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