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Measurement of the high energy -rays from heavy ion reactions using \v{C}erenkov detector
The energetic bremsstrahlung photons up to 100 MeV produced in heavy ion
collisions can be used as a sensitive probe to the short range correlation in
atomic nuclei. The energy of the -rays can be measured by collecting
the \v{C}erenkov light in medium induced by the fast electrons generated in
Compton scattering or electromagnetic shower of the incident ray. Two
types of detectors, based on pure water and lead glass as the sensitive
material respectively, are designed for the above purpose. The
response and optical photon propagation in detectors have been simulated based
on the electromagnetic and optical processes in Geant4. The inherent energy
resolution of for water and
for lead glass are obtained. The geometry size of
lead glass and water are optimized at cm and
cm, respectively, for detecting high energy
-rays at 160 MeV. Hough transform method has been applied to
reconstruct the direction of the incident -rays, giving the ability to
distinguish experimentally the high-energy rays produced in the
reactions on the target from the random background cosmic ray muons
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