High precision photon flux determination for photon tagging experiments

A. Teymurazyan, A. Ahmidouch, P. Ambrozewicz, A. Asratyan, K. Baker, L. Benton, V. Burkert, E. Clinton, P. Cole, P. Collins, D. Dale, S. Danagoulian, G. Davidenko, R. Demirchyan, A. Deur, A. Dolgolenko, G. Dzyubenko, R. Ent, A. Evdokimov, J. FengM. Gabrielyan, L. Gan, A. Gasparian, A. Glamazdin, V. Goryachev, K. Hardy, J. He, M. Ito, L. Jiang, D. Kashy, M. Khandaker, A. Kolarkar, M. Konchatnyi, A. Korchin, W. Korsch, O. Kosinov, S. Kowalski, M. Kubantsev, V. Kubarovsky, I. Larin, D. Lawrence, X. Li, P. Martel, V. Matveev, D. McNulty, B. Mecking, B. Milbrath, R. Minehart, R. Miskimen, V. Mochalov, I. Nakagawa, S. Overby, E. Pasyuk, M. Payen, R. Pedroni, Y. Prok, Barry Ritchie, C. Salgado, A. Shahinyan, A. Sitnikov, D. Sober, S. Stepanyan, W. Stevens, J. Underwood, A. Vasiliev, V. Vishnyakov, M. Wood, S. Zhou

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The Jefferson Laboratory PrimEx Collaboration has developed and implemented a method to control the tagged photon flux in photoproduction experiments at the 1% level over the photon energy range from 4.9 to 5.5 GeV. This method has been successfully implemented in a high precision measurement of the neutral pion lifetime. Here, we outline the experimental equipment and the analysis techniques used to accomplish this. These include the use of a total absorption counter for absolute flux calibration, a pair spectrometer for online relative flux monitoring, and a new method for post-bremsstrahlung electron counting.

Original languageEnglish (US)
Pages (from-to)300-309
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Dec 11 2014


  • Pair spectrometer
  • Photon tagging
  • Photonuclear reactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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