Speaker
Description
Nowadays, it is well known that the electromagnetic interaction between high-energy particles and matter experiences substantial modifications when the latter consists of a crystalline medium and its lattice axes are almost parallel to the input beam direction. In particular, strong boosts to both the Bremsstrahlung (by electrons and positrons) and the pair production (by photons) cross sections in high-density oriented crystals have been observed in the 10-to-100 GeV regime. This effect proves particularly appealing when it comes to inorganic scintillators, given the possibility to exploit it for the development of high-performance, ultra-compact electromagnetic calorimeters — some applications to future high-energy physics experiments already being under study, e.g. the KLEVER Small Angle Calorimeter. This work provides a detailed discussion of the results obtained by probing a PWO (lead tungstate) oriented sample with 120 GeV/$c$ electrons and positrons at the CERN North Area: in particular, direct measurements of the enhancement in the scintillation light production with respect to the random lattice orientation are presented, and a comparison between the outcomes obtained with electrons and positrons is made. Moreover, output radiation measurements on oriented samples of other commonly used inorganic scintillator such as BGO and YAG have been recently performed in the sub-GeV regime at the MAMI-B facility: an overview on the resulting characterisation is given.
| First author | Mattia Soldani |
|---|---|
| mattiasoldani93@gmail.com | |
| Collaboration / Activity | STORM collaboration |
