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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Coherent bremsstrahlung, coherent pair production, birefringence, and polarimetry in the 20-170 GeV energy range using aligned crystals
Physical Review Special Topics - Accelerators and Beams, Volume 11, No. 4, Article 041001, Year 2008
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Description
The processes of coherent bremsstrahlung (CB) and coherent pair production (CPP) based on aligned crystal targets have been studied in the energy range 20-170 GeV. The experimental arrangement allowed for measurements of single photon properties of these phenomena including their polarization dependences. This is significant as the theoretical description of CB and CPP is an area of active debate and development. With the approach used in this paper, both the measured cross sections and polarization observables are predicted very well. This indicates a proper understanding of CB and CPP up to energies of 170 GeV. Birefringence in CPP on aligned crystals is applied to determine the polarization parameters in our measurements. New technologies for high-energy photon beam optics including phase plates and polarimeters for linear and circular polarization are demonstrated in this experiment. Coherent bremsstrahlung for the strings-on-strings (SOS) orientation yields a larger enhancement for hard photons than CB for the channeling orientations of the crystal. Our measurements and our calculations indicate low photon polarizations for the high-energy SOS photons. © 2008 The American Physical Society.
Authors & Co-Authors
Apyan, A.
Armenia, Yerevan
Yerevan Physics Institute
United States, Evanston
Northwestern University
Avakian, Robert O.
Armenia, Yerevan
Yerevan Physics Institute
Badelek, B.
Sweden, Uppsala
Uppsala Universitet
Ballestrero, Sergio
Italy, Florence
Università Degli Studi Di Firenze
Switzerland, Geneva
Organisation Européenne Pour la Recherche Nucléaire
South Africa, Johannesburg
University of the Witwatersrand
Biino, Cristina
Switzerland, Geneva
Organisation Européenne Pour la Recherche Nucléaire
Italy, Turin
Università Degli Studi Di Torino
Birol, Inanç
United States, Evanston
Northwestern University
Cenci, P.
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Connell, Simon H.
South Africa, Johannesburg
University of the Witwatersrand
Eichblatt, S.
United States, Evanston
Northwestern University
Fonseca, T.
United States, Evanston
Northwestern University
Freund, A. K.
France, Grenoble
European Synchrotron Radiation Facility
Gorini, Benedetto
Italy, Turin
Università Degli Studi Di Torino
Groess, Robert
South Africa, Johannesburg
University of the Witwatersrand
Ispirian, K. A.
Armenia, Yerevan
Yerevan Physics Institute
Ketel, Tjeerd J.
Netherlands, Amsterdam
Fom-institute of Subatomic Physics - Nikhef
Kononets, Yu V.
Russian Federation, Moscow
National Research Centre Kurchatov Institute
Lopez, A.
Spain, Santiago de Compostela
Universidad de Santiago de Compostela
Mangiarotti, Alessio
Italy, Florence
Università Degli Studi Di Firenze
Van Rens, B.
Netherlands, Amsterdam
Fom-institute of Subatomic Physics - Nikhef
Sellschop, J. P.Friedel
South Africa, Johannesburg
University of the Witwatersrand
Shieh, M.
United States, Evanston
Northwestern University
Sona, Pietro
Italy, Florence
Università Degli Studi Di Firenze
Strakhovenko, V. M.
Russian Federation, Novosibirsk
Budker Institute of Nuclear Physics of the Siberian Branch of the Ras
Uggerhöj, Erik
Denmark, Aarhus
Aarhus Universitet
Uggerhøj, Ulrik Ingerslev
Denmark, Aarhus
Aarhus Universitet
Unel, Gokhan
United States, Irvine
University of California, Irvine
Velasco, M.
Switzerland, Geneva
Organisation Européenne Pour la Recherche Nucléaire
United States, Evanston
Northwestern University
Vilakazi, Zabulon Z.
Armenia, Yerevan
Yerevan Physics Institute
South Africa, Cape Town
University of Cape Town
Wessely, O.
Sweden, Uppsala
Uppsala Universitet
Statistics
Citations: 29
Authors: 29
Affiliations: 16
Identifiers
Doi:
10.1103/PhysRevSTAB.11.041001
e-ISSN:
10984402
Study Approach
Quantitative