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Coherent photoproduction of pi(0)- and eta-mesons off Li-7

Author:
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.  Werthmueller, D.  Zehr, F.  


Journal:
EUROPEAN PHYSICAL JOURNAL A


Issue Date:
2013


Abstract(summary):

Coherent photoproduction of pi(0)-mesons from threshold (E-th approximate to 136 MeV) throughout the Delta-resonance region and of eta-mesons close to the production threshold (E-th approximate to 570 MeV for eta) has been measured for Li-7 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 4 pi 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 eta production had been only identified for the lightest nuclear systems (H-2 and He-3). For He-3 a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for eta production agree with a plane-wave approximation. Contrary to He-3, neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed.


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