Measurements Of C-12((Gamma)Over-Right-Arrow, Pp) Photon Asymmetries For E-Gamma=200-450 Mev

J. Robinson,I. J. D. Macgregor,J. R. M. Annand,P. Aguar-Bartolome,L. K. Akasoy,H. J. Arends,Ya. I. Azimov,K. Bantawa,R. Beck,V. S. Bekrenev,H. Berghaeuser,A. Braghieri,D. Branford,W. J. Briscoe,J. Brudvik,S. Cherepnya,R. F. B. Codling,B. T. Demissie,M. Dieterle,E. J. Downie,P. Drexler,L. V. Fil'Kov,D. I. Glazier,R. Gregor,D. Hamilton,E. Heid,D. Hornidge,D. Howdle,O. Jahn,T. C. Jude,V. L. Kashevarov,I. Keshelashvili,R. Kondratiev,M. Korolija,M. Kotulla,A. A. Koulbardis,S. P. Kruglov,B. Krusche,V. Lisin,K. Livingston,D. M. Manley,J. C. Mcgeorge,E. F. Mcnicoll,V. Metag,D. G. Middleton,A. Mushkarenkov,B. M. K. Nefkens,A. Nikolaev,R. Novotny,M. Oberle,M. Ostrick,R. O. Owens,P. B. Otte,B. Oussena,P. Pedroni,A. Polonski,S. Prakhov,G. Rosner,T. Rostomyan,S. Schumann,M. H. Sikora,D. I. Sober,A. Starostin,I. I. Strakovsky,I. M. Suarez,I. Supek,C. M. Tarbert,M. Thiel,A. Thomas,M. Unverzagt,D. P. Watts,D. Werthmueller,L. Witthauer

EUROPEAN PHYSICAL JOURNAL A（2013）

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摘要

The C-12((gamma) over right arrow, pp) reaction has been studied in the photon energy range 200-450 MeV at the Mainz microtron MAMI-C, where linearly polarised photons were energy-tagged using the Glasgow-Mainz Tagged Photon Spectrometer and protons were detected in the Crystal Ball detector. The photon asymmetry Sigma has been measured over a wider E-gamma range than previous measurements. The strongest asymmetries were found at low missing energies where direct emission of nucleon pairs is expected. Cuts on the difference in azimuthal angles of the two ejected protons increased the magnitude of the observed asymmetries. At low missing energies the Sigma data exhibit a strong angular dependence, similar to deuteron photodisintegration.

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