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Simulation of a NE213 Gamma Response Function using an Improved Multi-parameter Minimization Procedure

Abstract : The Gamma response functions of a 15cm diameter x 6cm thick NE213 detector were recently measured with standard $^{22}$Na, $^{60}$Co and $^{241}$Am $\gamma$ sources in order to calibrate the scintillation counter and were simulated in the present work with the MCNPX2.5e Monte-Carlo code. The MINUIT2 package, developed at C.E.R.N., was used to minimize the $\chi$$^2$ between measured and calculated pulse height distributions in order to derive the experimental resolution parameters. A C++ code was written to simulate various resolution broadening and background shapes. The results are in good agreement with the experimental response function except in the low energy range (below 100keV) which could be improved by a better description of the detector environment.
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O. Litaize. Simulation of a NE213 Gamma Response Function using an Improved Multi-parameter Minimization Procedure. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2007, 580 (1), pp.98-101. ⟨10.1016/j.nima.2007.05.046⟩. ⟨cea-02513480⟩

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