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Abstract
We present the first application of polysiloxane-based scintillators as active medium in a shashlik sampling calorimeter. These results were obtained from a testbeam campaign of a ∼6×6×45 cm3 (13 X0 depth) prototype. A Wavelength Shifting fiber array of 36 elements runs perpendicularly to the stack of iron (15 mm) and polysiloxane scintillator (15 mm) tiles with a density of about one over cm2. Unlike shashlik calorimeters based on plastic organic scintillators, here fibers are optically matched with the scintillator without any intermediate air gap. The prototype features a compact light readout based on Silicon Photo-Multipliers embedded in the bulk of the detector. The detector was tested with electrons, pions and muons with energies ranging from 1 to 7 GeV at the CERN-PS. This solution offers a highly radiation hard detector to instrument the decay region of a neutrino beam, providing an event-by-event measurement of high-angle decay products associated with neutrino production (ENUBET, Enhanced NeUtrino BEams from kaon Tagging, ERC project). The results in terms of light yield, uniformity and energy resolution, are compared to a similar calorimeter built with ordinary plastic scintillators.
Highlights
Shashlik calorimeters [1,2] have been used since more than 20 years in particle physics [3,4,5,6,7,8]
The INFN SCENTT Collaboration has developed an ultra-compact module (UCM) where every single fiber segment is directly connected to a Silicon PhotoMultiplier (SiPM) avoiding dead regions due to fiber bundling with a net improvement in the homogeneity of the longitudinal sampling
We have developed a 13 X0 shashlik calorimeter using for the first time a polysiloxane-based scintillator with 1.5 cm thick iron absorbers and 1.5 cm thick scintillator tiles read out by Y11 multi-clad WaveLength Shifting (WLS) fibers
Summary
Shashlik calorimeters [1,2] have been used since more than 20 years in particle physics [3,4,5,6,7,8]. Methods in Physics Research, A 956 (2020) 163379 production in the decay tunnel of conventional neutrino beams Thanks to their robustness and good performance/cost ratio they could be effectively used over large surfaces to perform a precise measurement of the νe flux originating from kaon decays (K+ → e+π0νe) [9]. Since 2016, the ENUBET Collaboration has carried on an extensive experimental campaign of tests at the CERN-PS beamlines employing prototypes with standard plastic organic scintillators. In this context, the possibility of employing polysiloxane based scintillators instead of plastic scintillators is extremely appealing.
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