Linear Response of CsI(Tl) Crystal to Energetic Photons below 20 MeV

Abstract

The linear response of CsI(Tl) crystals to $\gamma$-rays plays a crucial role in their calibration, as any deviation from linearity can introduce systematic errors not negligible in the measurement of $\gamma$ energy spectra, particularly at high energies. In this study, the responses of CsI(Tl) crystals to high-energy photons up to 20 MeV are investigated using quasi monochromatic $\gamma$ beam provided by the Shanghai Laser Electron Gamma Source. The spectra are folded using a detector filter implemented by Geant4. Both quadratic and linear fits to six energy points are used to assess the linearity of the CsI(Tl) detector. The results demonstrate that the difference between the linear and non-linear fits is at the level of 4\%. Applying these findings to the $\gamma$ hodoscope of the Compact Spectrometer for Heavy Ion Experiment (CSHINE), the potential systematic uncertainties caused by CsI(Tl) non-linearity are evaluated. This work provides a comprehensive calibration methodology for employing CsI(Tl) crystal to detect high energy $\gamma$-rays.

References in corpus (5)

• CSHINE for studies of HBT correlation in Heavy Ion Reactions
• A CsI hodoscope on CSHINE for Bremsstrahlung γ-rays in Heavy Ion Reactions
• Reconstruction of Bremsstrahlung $\gamma$-rays Spectrum in Heavy Ion Reactions with Richardson-Lucy Algorithm
• Extract neutron-neutron interaction strength and spatial-temporal dynamics of neutron emission from two-particle correlation function
• The neutron array of the compact spectrometer for heavy ion experiments in Fermi energy region

Cited by in corpus (2)

• Precise Measurement of Short-Range Correlations in Nuclei from Bremsstrahlung Gamma Ray Emission in Low-Energy Heavy-Ion Collisions
• Experimental Study of Bremsstrahlung Gamma Ray Emission and Short-Range Correlations in ${}^{124}$Sn+${}^{124}$Sn Collisions at 25 MeV/u