Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8166235 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2018 | 5 Pages |
Abstract
Single- and multi-photon spectra of pulsed γ-ray beams produced at 17, 34, and 40 MeV in the laser Compton scattering were measured with an 8” à 12” NaI(Tl) detector. By using the experimental single-photon spectra as the probability function of generating random numbers, response functions of the NaI(Tl) detector to j-fold photons (j = 2, 3, 4 ...) were constructed. The least-square fits to the experimental multi-photon spectra by the Poisson distribution consisting of the response functions were made. The multi-photon spectra measured at 17 and 34 MeV follow the Poisson distribution. A quenching phenomenon of multi-photon spectra was observed for 40 MeV γ-rays as a result of the saturation at the photomultiplier tube of the NaI(Tl) detector. The original Poisson distributions were restored from the quenched spectra using a saturation curve in the form of y=aâ
xη with η=eâbx. We discuss the accuracy of photon-flux determination.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
Hiroaki Utsunomiya, Takahumi Watanabe, Takashi Ari-izumi, Daiki Takenaka, Takeru Araki, Kazuya Tsuji, Ioana Gheorghe, Dan M. Filipescu, Sergey Belyshev, Konstantin Stopani, Dmytro Symochko, Hongwei Wang, Gongtao Fan, Therese Renstrøm, Gry M. Tveten,