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

F Pheron,J Ahrens,J R M Annand,H J Arends,K Bantawa,P A Bartolome,R Beck,V S Bekrenev,H Berghaeuser,B Boillat,A Braghieri,D Branford,W J Briscoe,J Brudvik,S Cherepnya,B T Demissie,M Dieterle,E J Downie,P Drexler,D I Glazier, E Heid, L V Filkov, D Hornidge, D Howdle,O Jahn, I Jaegle,T C Jude,V L Kashevarov,I Keshelashvili, R Kondratiev,M Korolija,M Kotulla, A A Kulbardis,S P Kruglov,B Krusche,V Lisin, K Livingston,I J D Macgregor,Y Maghrbi, J Mancell, D M Manley, Z Marinides,M Martinez,J C Mcgeorge, E F Mcnicoll,D Mekterovic, V Metag,S Micanovic,D G Middleton, A Mushkarenkov,B M K Nefkens,A V Nikolaev, R Novotny,M Oberle,M Ostrick, B Oussena, P Pedroni, A Polonski,S Prakhov,James Robinson, G Rosner, T Rostomyan,S Schumann,Marek Sikora,D I Sober,A Starostin,I Supek,M Thiel,A W Thomas,M Unverzagt, D P Watts, D Werthmueller,L Witthauer, F Zehr

Physics Letters B（2012）

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摘要

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 ηHe3 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.

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