PARIS磷开关探测器的中子响应
Neutron response of PARIS phoswich detector
摘要：
我们研究了用于测量原子核高集体态衰变产生的高能（E $_γ$ = 5 - 30 MeV）$γ$射线的PARIS phoswich [LaBr $_3$（Ce）-NaI（Tl）]探测器的中子响应。利用飞行时间（TOF）和脉冲形状鉴别（PSD）技术测量了Phoswich探测器中LaBr $_3$（Ce）和NaI（Tl）晶体在E $_n$ = 1 ~ 9 MeV能量范围内的相对中子探测效率，并与基于GEANT 4的模拟结果进行了比较。结果表明，对于3 MeV的$_n$ $>$，在LaBr-$_3$（Ce）晶体中，有$\sim$ 95%的中子具有主要相互作用，表明即使在$\sim$ 15 cm的飞行路径上也能实现明显的$γ$分离.
英文摘要：
We have studied neutron response of PARIS phoswich [LaBr$_3$(Ce)-NaI(Tl)] detector which is being developed for measuring the high energy (E$_γ$ = 5 - 30 MeV) $γ$ rays emitted from the decay of highly collective states in atomic nuclei. The relative neutron detection efficiency of LaBr$_3$(Ce) and NaI(Tl) crystal of the phoswich detector has been measured using the time-of-flight (TOF) and pulse shape discrimination (PSD) technique in the energy range of E$_n$ = 1 - 9 MeV and compared with the GEANT4 based simulations. It has been found that for E$_n$ $>$ 3 MeV, $\sim$ 95 \% of neutrons have the primary interaction in the LaBr$_3$(Ce) crystal, indicating that a clear n-$γ$ separation can be achieved even at $\sim$15 cm flight path.
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