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|Title:||Strong Reduction of the Effective Radiation Length in an Axially Oriented Scintillator Crystal|
Tikhomirov, V. V.
De Salvador, D.
|Keywords:||ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика|
|Publisher:||American Physical Society|
|Citation:||Phys Rev Lett 2018;121(2)|
|Abstract:||We measured a considerable increase of the emitted radiation by 120 GeV/c electrons in an axially oriented lead tungstate scintillator crystal, if compared to the case in which the sample was not aligned with the beam direction. This enhancement resulted from the interaction of particles with the strong crystalline electromagnetic field. The data collected at the external lines of the CERN Super Proton Synchrotron were critically compared to Monte Carlo simulations based on the Baier-Katkov quasiclassical method, highlighting a reduction of the scintillator radiation length by a factor of 5 in the case of beam alignment with the  crystal axes. The observed effect opens the way to the realization of compact electromagnetic calorimeters or detectors based on oriented scintillator crystals in which the amount of material can be strongly reduced with respect to the state of the art. These devices could have relevant applications in fixed-target experiments, as well as in satellite-borne γ telescopes.|
|Sponsorship:||This work was partially supported by the INFN-AXIAL experiment and by the EU commission through the PEARL (G. A. 690991) and CRYSBEAM (G. A. 615089) projects. This work is also partially supported by the Belarusian Republican Foundation for Fundamental Research and the Ministry of Education of the Republic of Belarus under Contract No. F18 MV-026. We acknowledge the support of the PS/SPS physics coordinator and of the CERN SPS, Secondary Beams and Areas staff. We acknowledge the CINECA award under the ISCRA initiative for the availability of high-performance computing resources and support. We also acknowledge technical support of A. Gaiardo and M. Valt. L. B. would like to thank S. Cutini, G. Mezzadri, M. Moulson, P. Picozza, M. Raggi, and M. Tavani for fruitful discussions on possible applications and V. Guidi and G. Cavoto for funding and mentoring support.|
|Appears in Collections:||Статьи НИУ «Институт ядерных проблем»|
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