Measurements of 12C $(\vec{\gamma},pp)$ photon asymmetries for $E_{\gamma}=200$ –450 MeV

J Robinson,E Heid,Ya I Azimov,T Rostomyan,A Mushkarenkov,A Polonski,C M Tarbert,I Keshelashvili,G Rosner,S Cherepnya,D I Sober,D Hamilton,A Starostin,S P Kruglov,V Lisin,K Bantawa,D I Glazier,L Witthauer,A Braghieri,H J Arends,V Metag,I I Strakovsky,M Oberle,B Oussena,M Thiel,H Berghäuser,M H Sikora,A Nikolaev,R Beck,R Kondratiev,S Prakhov,B Krusche,P Aguar-Bartolomé,M Kotulla,T C Jude,K Livingston,M Dieterle,S Schumann,M Unverzagt,D Howdle,L K Akasoy,D Hornidge,E J Downie,J Brudvik,B M K Nefkens,D Werthmueller,P B Otte,R Gregor,I Supek,P Drexler,D M Manley,R F B Codling,J R M Annand,I J D Macgregor,P Pedroni,E F Mcnicoll,D G Middleton,R Novotny,A Thomas,J C Mcgeorge,M Korolija,W J Briscoe,D Branford,V L Kashevarov,O Jahn,M Ostrick,A Koulbardis ,V Bekrenev ,I Suarez ,R.o Owens ,B Demissie ,L.v Filʼkov ,D Watts

doi:10.1140/epja/i2013-13065-0

Measurements of 12C $(\vec{\gamma},pp)$ photon asymmetries for $E_{\gamma}=200$ –450 MeV

J Robinson, E Heid + Show 71 more

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https://doi.org/10.1140/epja/i2013-13065-0

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Journal: The European Physical Journal A	Publication Date: May 1, 2013
Citations: 3	License type: cc-by

Affiliation: University of Glasgow, Petersburg Nuclear Physics Institute, INFN Sezione di Pavia, University of Edinburgh, University of Basel, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Catholic University of America, University of California, Los Angeles, Kent State University, Johannes Gutenberg University Mainz, University of Giessen, George Washington University, University of Bonn, Mount Allison University, Rudjer Boskovic Institute

#Low Missing Energies #Difference In Azimuthal Angles + Show 8 more

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Abstract

The 12C$(\vec{\gamma},pp)$ 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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