Measurement of the high energy $\gamma$-rays from heavy ion reactions using Čerenkov detector

Abstract

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 $\gamma$-rays can be measured by collecting the Čerenkov light in medium induced by the fast electrons generated in Compton scattering or electromagnetic shower of the incident $\gamma$ ray. Two types of detectors, based on pure water and lead glass as the sensitive material respectively, are designed for the above purpose. The $\gamma$ response and optical photon propagation in detectors have been simulated based on the electromagnetic and optical processes in Geant4. The inherent energy resolution of $0.022+0.51/E_{\gamma }^{1/2}$ for water and $0.002+0.45/E_{\gamma }^{1/2}$ for lead glass are obtained. The geometry size of lead glass and water are optimized at $30\times 30\times 30$ cm${}^3$ and $60\times 60\times 120$ cm${}^3$, respectively, for detecting high energy $\gamma$-rays at 160 MeV. Hough transform method has been applied to reconstruct the direction of the incident $\gamma$-rays, giving the ability to distinguish experimentally the high-energy $\gamma$ rays produced in the reactions on the target from the random background cosmic ray muons.

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Cited by in corpus (2)

• Reconstruction of Bremsstrahlung $\gamma$-rays Spectrum in Heavy Ion Reactions with Richardson-Lucy Algorithm
• Nucleon Short-Range Correlations and High-Momentum Dynamics: Implications on the Equation of State of Dense Matter