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

Maghrbi, Y. and Krusche, B. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Beck, R. and Bekrenev, V. and Boillat, B. and Braghieri, A. and Branford, D. and Briscoe, W. J. and Brudvik, J. and Cherepnya, S. and Codling, R. F. B. and Downie, E. J. and Drexler, P. and Fil`kov, L. V. and Fix, A. and Glazier, D. I. and Gregor, R. and Heid, E. and Hornidge, D. and Jaegle, I. and Jahn, O. and Kashevarov, V. L. and Keshelashvili, I. and Knezevic, A. and Kondratiev, R. and Korolija, M. and Krambrich, D. and Lang, M. and Lisin, V. and Livingston, K. and Lugert, S. and MacGregor, I. J. D. and Manley, D. M. and Martinez, M. and McGeorge, J. C. and Mekterovic, D. and Metag, V. and Nefkens, B. M. K. and Nikolaev, A. and Novotny, R. and Ostrick, M. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. and Price, J. W. and Rosner, G. and Rost, M. and Rostomyan, T. and Schadmand, S. and Schumann, S. and Sober, D. and Starostin, A. and Supek, I. and Tarbert, C. M. and Thomas, A. and Unverzagt, M. and Watts, D. P. and Werthmueller, D. and Zehr, F.. (2013) Coherent photoproduction of pi(0)- and eta-mesons off Li-7. The European physical journal. A, Hadrons and nuclei, Vol. 49, H. 3. p. 38.

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Official URL: http://edoc.unibas.ch/dok/A6223410

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Mar 2014 13:12
Deposited On:27 Mar 2014 13:12

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