共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
在北京正负电子对撞机的J/ψ和Ds能区,选择了辐射巴巴事例,并以此来研究北京谱仪的桶部簇射计数器能量响应特性.在消除了由于电子和辐射光子在桶部簇射计数器中沉积能量区域重叠的影响后,正确地得到了桶部簇射计数器在电子和光子动量小于2GeV以下的能量响应,表明在所研究能区,桶部簇射计数器的能量响应线性很好.对桶部簇射计数器微小的非线性进行修正后,重建的π0不变质量谱得到改善. 相似文献
4.
5.
6.
7.
8.
9.
本文报告了12A GeV α粒子与乳胶作用次级粒子多得数分布以及簇射粒子与重电离粒子之间的关联,得出随着族射粒子数的增加,重电离粒子平均多重数也随着增加. 相似文献
10.
11.
BEPCⅡ上正在进行激光丝系统的研究。基于GEANT4对激光丝系统探测器进行了模拟。首先模拟了康普顿散射信号在探测器材料中电磁簇射的分布,确定了探测器初始尺寸。之后模拟了不同尺寸下探测器的输出,根据模拟结果确定了探测器的最终尺寸,使得探测器在所确定的尺寸有较大的信号输出。还进行了不同康普顿散射位置时探测器的响应模拟,结果表明束流管道的影响是不可忽略的,是探测器响应非线性的主要原因,预计该结果对束流截面测量有重要意义。最后简要介绍了BEPCⅡ几种可能的束流能量时,探测器信号输出和能量泄漏的模拟结果。 相似文献
12.
In this paper, we studied the development of hadronic shower in an electromagnetic calorimeter of Alpha Magnetic Spectrometer Ⅱ. Two parametrized empirical formulae were proposed to describe the hadronic shower shape in calorimeter. Using 100 GeV proton beam incident on the center of the ECAL, detailed plots of lateral and longitudinal hadronic shower behavior were given and we found the formulae can describe the development of the hadronic shower with the test beam data. The possible application of the parametrized formulae including e±-π± discrimination and tau jet reconstruction was discussed. 相似文献
13.
14.
The variation of lateral shower age parameter with zenith angle for different shower size ranges is studied. The observed
variation is in agreement with the electron-photon cascade theory and with the other EAS observations. It is found that up
to zenith angle 30°, shower ‘age’ is practically independent of zenith angle. So it is difficult to correlate the reported
high ‘age’ value of the excess showers from the direction of plausible point sources with zenith angle. The change in the
value of shower age with atmospheric depth is studied and is found to be consistent with the prediction of cascade theory
and simulation results. From the study of the variation of shower age with shower size for two different zenith angle intervals
it is found that the shower age decreases with size but the rate of change of shower age decreases at higher sizes. 相似文献
15.
V. M. Grigor’ev 《Physics of Particles and Nuclei Letters》2008,5(5):456-461
An empirical approach is presented for reconstruction of the extensive air shower (EAS) cascade curve according to data of the Cherenkov track detector. The proposed method, unlike conventional ones, is based on experimentally measured parameters and on calculated values which weakly depend on the model of shower development. 相似文献
16.
Summary We describe a method of analysis for the reconstruction of the arrival direction of a high-energy photon impacting on the
top of the atmosphere by using the directions of the particles on the shower front as measured by a ground-based array of
tracking chambers uniformly distributed on a square surface; as an example, an array with enclosed surface of (120×120) m2 has been considered. Estimates on the accuracy of reconstruction are given, after application of the method to computer-simulated
shower directions as a function of the number of ?smapling? detectors and of their accuracy in the measurement of the ?local?
shower direction.
Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990. 相似文献
17.
S. S. Khokhlov N. S. Barbashina A. G. Bogdanov A. N. Dmitrieva L. I. Dushkin E. A. Zadeba V. V. Kindin E. A. Kovylyaeva R. P. Kokoulin K. G. Kompaniets V. S. Kruglikova A. A. Petrukhin V. A. Khomyakov D. V. Chernov V. V. Shutenko I. I. Yashin 《Physics of Particles and Nuclei Letters》2014,11(1):27-30
A technique for measuring the cascade shower energy in the NEVOD Cherenkov water detector with a spatial lattice of quasi-spherical modules is discussed. The technique allows the number of cascade particles that move near the shower axis to be reconstructed on the basis of analysis of response amplitudes of triggered photomultiplier tubes. The technique of cascade-curve reconstruction was applied to cascade showers generated by near-horizontal high-energy muons extracted by means of the DECOR coordinate-tracking detector arranged around the Cherenkov water detector. The first results of measuring the energy spectrum of cascade showers of 10–1000 GeV are presented. 相似文献
18.
19.
20.
《中国物理C(英文版)》2016,(9)
The electromagnetic calorimeter(ECAL) of the Alpha Magnetic Spectrometer(AMS-02) is one of the key detectors for dark matter searches. It measures the energies of electrons, positrons and photons and seperates them from hadrons. Currently, there are 5 dead cells in the ECAL, which affect the reconstructed energy of 4.2%of total events in the ECAL acceptance. When an electromagnetic shower axis is close to the ECAL border, due to the side leakage, the reconstructed energy is affected as well. In this paper, methods for dead cells and side leakage corrections for the ECAL energy reconstruction are presented. For events with the shower axis crossing dead cells,applying dead cell correction improves the difference in the reconstructed energy from 12% to 1%, while for events near the ECAL border, with side leakage correction it is improved from 4% to 1%. 相似文献