NaI (Tl) calorimeter calibration and simulation for Coulomb sum rule experiment in Hall-A at Jefferson Lab

YAN Xin-Hu; CHEN Jian-Ping; LV Hai-Jiang; Oh Yoomin; YE Yun-Xiu; YAO Huan

doi:10.1088/1674-1137/35/5/017

Chinese Physics C> 2011, Vol. 35> Issue(5) : 488-493 DOI: 10.1088/1674-1137/35/5/017

NaI (Tl) calorimeter calibration and simulation for Coulomb sum rule experiment in Hall-A at Jefferson Lab

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A precision measurment of inclusive electron scattering cross sections is carried out at Jefferson Lab in the quasi-elastic region for ⁴He, ¹²C, ⁵⁶Fe and ²⁰⁸Pb targets. The longitudinal (R_L) and transverse (R_T) response functions of the nucleon need to be extracted precisely in the momentum transfer range 0.55 GeV/c≤|q|≤1.0 GeV/c. To achieve the above goal, a NaI (Tl) calorimeter is used to distinguish good electrons from background, including pions and low energy electrons rescattered from the walls of the spectrometer magnets. Due to a large set of kinematics and changes in HV settings, a number of calibrations are performed for the NaI (Tl) detector. Corrections for a few blocks of NaI (Tl) with bad or no signal are applied. The resolution of the NaI (Tl) detector after calibration reached (δE)/√E ≈ 3% at E=1 GeV. The performance of the NaI (Tl) detector is compared with a simulation. The good calibration and background analysis for the NaI(Tl) detector are very important for the reduction of the systematic error of cross sections and the separation of R_L and R_T.

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YAN Xin-Hu, CHEN Jian-Ping, LV Hai-Jiang, Oh Yoomin, YE Yun-Xiu and YAO Huan. NaI (Tl) calorimeter calibration and simulation for Coulomb sum rule experiment in Hall-A at Jefferson Lab[J]. Chinese Physics C, 2011, 35(5): 488-493. doi: 10.1088/1674-1137/35/5/017

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Received: 2010-08-05
Revised: 2010-09-21

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沈阳化工大学材料科学与工程学院沈阳 110142

NaI (Tl) calorimeter calibration and simulation for Coulomb sum rule experiment in Hall-A at Jefferson Lab

Received Date: 2010-08-05
Accepted Date: 2010-09-21
Available Online: 2011-05-05

Abstract: A precision measurment of inclusive electron scattering cross sections is carried out at Jefferson Lab in the quasi-elastic region for ⁴He, ¹²C, ⁵⁶Fe and ²⁰⁸Pb targets. The longitudinal (R_L) and transverse (R_T) response functions of the nucleon need to be extracted precisely in the momentum transfer range 0.55 GeV/c≤|q|≤1.0 GeV/c. To achieve the above goal, a NaI (Tl) calorimeter is used to distinguish good electrons from background, including pions and low energy electrons rescattered from the walls of the spectrometer magnets. Due to a large set of kinematics and changes in HV settings, a number of calibrations are performed for the NaI (Tl) detector. Corrections for a few blocks of NaI (Tl) with bad or no signal are applied. The resolution of the NaI (Tl) detector after calibration reached (δE)/√E ≈ 3% at E=1 GeV. The performance of the NaI (Tl) detector is compared with a simulation. The good calibration and background analysis for the NaI(Tl) detector are very important for the reduction of the systematic error of cross sections and the separation of R_L and R_T.