  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 $\sim$6$\times$6$\times$45 cm$^3$ (13 $X_0$
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 cm$^2$. 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.

Instrumentation and Detectors;High Energy Physics - Experiment