Coherent photoproduction of η-mesons off 3He – search for η-mesic nuclei (CROSBI ID 186151)
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Podaci o odgovornosti
Pheron, F. ; ... ; Korolija, Milorad, ... ; Mekterović, Darko ; ... ; Mićanović ; Saša ; ... ; Supek, Ivan ; ... ; Zehr, F.
engleski
Coherent photoproduction of η-mesons off 3He – search for η-mesic nuclei
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.
total cross section ; photoproduction ; eta meson ; final-state interaction ; Crystal Ball ; MAMI
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Podaci o izdanju
709 (1/2)
2012.
21-27
objavljeno
0370-2693
1873-2445
10.1016/j.physletb.2012.01.075