Coherent photoproduction of π0- and η-mesons off 7Li
- Maghrbi, Y.
- Krusche, B.
- Ahrens, J.
- Annand, J.R.M.
- Arends, H. J.
- Beck, R.
- Bekrenev, V.
- Boillat, B.
- Braghieri, A.
- Branford, D.
- Briscoe, W. J.
- Brudvik, J.
- Cherepnya, S.
- Codling, R. F. B.
- Downie, E.J.
- Drexler, P.
- Fil’kov, L. V.
- Fix, A.
- Glazier, D.I.
- Gregor, R.
- Heid, E.
- Hornidge, D.
- Jaegle, I.
- Jahn, O.
- Kashevarov, V. L.
- Keshelashvili, I.
- Knezevic, A.
- Kondratiev, R.
- Korolija, M.
- Krambrich, D.
- Lang, M.
- Lisin, V.
- Livingston, K.
- Lugert, S.
- MacGregor, I.J.D.
- Manley, D. M.
- Martinez, M.
- McGeorge, J.C.
- Mekterovic, D.
- Metag, V.
- Nefkens, B. M. K.
- Nikolaev, A.
- Novotny, R.
- Ostrick, M.
- Pedroni, P.
- Pheron, F.
- Polonski, A.
- Prakhov, S.
- Price, J. W.
- Rosner, G.
- Rost, M.
- Rostomyan, T.
- Schadmand, S.
- Schumann, S.
- Sober, D.
- Starostin, A.
- Supek, I.
- Tarbert, C. M.
- Thomas, A.
- Unverzagt, M.
- Watts, D. P.
- Werthmüller, D.
- Zehr, F.
DOIAbstract
Coherent photoproduction of π0-mesons from threshold (E th ≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (E th ≈ 570 MeV for η has been measured for 7Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4π solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent η production had been only identified for the lightest nuclear systems (2H and 3He . For 3He a large enhancement of the cross section abov...
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