Electron identification and energy measurement with Emulsion Cloud Chamber
Electron identification and energy measurement with Emulsion Cloud Chamber
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使用乳化云室进行电子识别和能量测量
DOI：
10.1016/j.phpro.2015.11.099
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Nobuko Kitagawa
中科院分区：
文献类型：
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作者：
A. Suzuki1;K. Masuda;Y. Takeuchi;Y. Itow;T. Sako;Y. Matsumi;T. Nakayama;S. Ueda;K. Miura and K. Kusano;Nobuko Kitagawa
带电粒子在穿过材料时会经历多重库仑散射（MCS）。它们的动量可以直接从散射角的分布估计。电子（或正电子）在韧致辐射中由于能量的损失而发生很大的角度变化，利用这一特性将其与其它带电粒子区分开来。电子能量通常通过对电磁簇射（e.m.）的计数来测量。簇射）在乳胶云室（ECC）中跟踪，因此需要足够的吸收材料来开发簇射。在亚GeV到几个GeV的范围内，电子不会产生明显的簇射。为了在有限的材料条件下估算该范围内的电子能量，考虑到韧致辐射中的能量损失，建立了基于散射角的新方法。从Monte Carlo模拟（MC）数据，这是由电子束（0.5GeV，1GeV，2GeV）曝光ECC产生的，我们推导出能量和散射角之间的相关性在每个乳胶层。我们确定了1GeV MC样品返回1GeV中心值的函数和一些参数，并将其应用于0.5GeV和2GeV样品，证实了在两个辐射长度内能量分辨率约为50%。
Charged particles undergo the Multiple Coulomb Scattering (MCS) when passing through a material. Their momentum can be estimated from the distribution of the scattering angle directly. Angle of electrons (or positrons) largely changes because of the energy loss in bremsstrahlung, and they are distinguished from other charged particles by making use of its feature. Electron energy is generally measured by counting of electromagnetic shower (e.m. shower) tracks in Emulsion Cloud Chamber (ECC), so enough absorber material is needed to develop the shower. In the range from sub-GeV to a few GeV, electrons don’t develop noticeable showers. In order to estimate the energy of electrons in this range with a limited material, we established the new method which is based on the scattering angle considering the energy loss in bremsstrahlung. From the Monte Carlo simulation (MC) data, which is generated by electron beam (0.5 GeV, 1 GeV, 2 GeV) exposure to ECC, we derived the correlation between energy and scattering angle in each emulsion layer. We fixed the function and some parameters which 1 GeV MC sample would return 1 GeV as the center value, and then applied to 0.5 GeV and 2 GeV sample and confirmed the energy resolution about 50% within two radiation length.