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1.
WANG DIAN-RONG WANG XIAN-PEI LIN JIAN-FENG JIANG YING-YUAN XI JI-WEI XIE YI-GANG XU YU-LIN LI CHENG-ZE CHEN YUAN-BAI CHEN ZHI-PING HAN SHU-RONG 《中国物理C(英文版)》1981,5(5):569-575
A scintillation counter array localization system, i.e, scintillation counter hodoscope, was studied and made for selecting events and triggering the streamer chamber in 1980. With this facility the penetrating position of the charged particles can be determined and it can be used as a trigger counter too. As soon as the charged particles penetrated this array and other scintillation telescope, the generated coincidence signal triggers the control system of the streamer chamber with the time delay 74 ns.On the other hand, this system also has a ability of selecting charged particle number penetrating the counter array, thus, the streamer chamber is able to record the event with certain multiplicity.This hodoscope contains a 8×8 scintillation counter array. Each plastic scintillator (type ST401) has the dimensions of 40×5×0.6 cm3 and the type of photomultipliers used is GDB50. The array area is 40×40 cm2.The fast electronics and data handling system were made by ourselves. The whole system works well during the test with the on-line microcomputer TRS-80 and is not expensive. 相似文献
2.
STUDY OF THE TIMING PERFORMANCE OF A LARGE AREA PLASTIC SCINTILLATION COUNTER FOR TOF MEASUREMENT
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WANG Dian-Rong XING Shi-Lin LIN Jian-Feng XU Yu-Lin JIANG Ying-Yuan XI Ji-Wei CHEN Yuan-Bai WANG Chao-Jun 《中国物理C(英文版)》1983,7(5):529-536
A large area plastic scintillation counter (80×10×1cm2) for TOF measurement has been made and the timing performance of this system has been measured. Various effects on the timing performance have been studied. 相似文献
3.
LIU Jin-Sheng HUANG Jing CHEN Ding ZHANG Ying ZHAI Liu-Ming CHEN Xu HU Xiao-Bin LIN Yu-Hui ZHANG Xue-Yao FENG Cun-Feng JIA Huan-Yu ZHOU Xun-Xiu CHEN Tian-Lu LI Hai-Jin LIU Mao-Yuan YUAN Ai-Fang 《中国物理C(英文版)》2015,39(8):086004-086004
Aiming at the observation of cosmic-ray chemical composition in the "knee" energy region, we have been developing a new type of air-shower core detector(YAC, Yangbajing Air shower Core detector array) to be set up at Yangbajing(90.522?E, 30.102?N, 4300 m above sea level, atmospheric depth: 606 g/m2) in Tibet, China.YAC works together with the Tibet air-shower array(Tibet-Ⅲ) and an underground water Cherenkov muon detector array(MD) as a hybrid experiment.Each YAC detector unit consists of lead plates of 3.5 cm thickness and a scintillation counter which detects the burst size induced by high energy particles in the air-shower cores.The burst size can be measured from 1 MIP(Minimum Ionization Particle) to 106 MIPs.The first phase of this experiment, named"YAC-Ⅱ ", consists of 16 YAC detectors each with a size of 40 cm×50 cm and distributed in a grid with an effective area of 10 m2.YAC-Ⅱ is used to check hadronic interaction models.The second phase of the experiment, called"YAC-Ⅱ ", consists of 124 YAC detectors with coverage of about 500 m2.The inner 100 detectors of 80 cm×50 cm each are deployed in a 10×10 matrix with a 1.9 m separation; the outer 24 detectors of 100 cm×50 cm each are distributed around these to reject non-core events whose shower cores are far from the YAC-Ⅱ array.YAC-Ⅱ is used to study the primary cosmic-ray composition, in particular, to obtain the energy spectra of protons, helium and iron nuclei between 5×1013eV and 1016 eV, covering the "knee" and also connected with direct observations at energies around 100 TeV.We present the design and performance of YAC-Ⅱ in this paper. 相似文献
4.
The performance of a 1m×1m drift chamber system have been measured with on-line microcomputer using comic rays. The time resolution is 4.26 ns. The spatial resolution is 132 μm and the efficiency is above 96%. The experimental set-up include five 1m×1m adjustable field drift chambers, scintillation counter trigger system, readout electronics and a TRS-80 microcomputer. The data acquisition and processing have been done with on-line microcomputer and off-line data analysis. 相似文献
5.
At the Bonn 2.5 GeV synchrotron the polarization of the Λ0 was measured at 40° and 90° for three energies. The kaon was detected with a strong focussing magnetic spectrometer and separated from other particles with the help of a differential liquid ?erenkov counter. The polarization was determined by means of the angular distribution of the decay proton which was measured with a combination of sonic spark chambers and a scintillation counter hodoscope. The typical statistical errors are about 13%. The systematic errors add up to 8%. 相似文献
6.
Radiation damage effects of several Chinese-made high-Z scintillation crystals have been studied on a 60Co irradiation unit of 100KCi Results on small size BGO crystals irradiated by 60Co γ rays with various doses from 5×103 to 7.5×105rad are presented.The decrease in scintillation light output depends non-linearly on the dose applied and saturation effects above 5×104rad have been observed.The spontaneous recovery of the light output can be described by the sum of at least three exponential functions.The radiation damage effects of small size BaF2,CsI(Tl) and ZnWO4 crystals at 5×105rad were also investigated.Serious damage to BaF2 has been found.Preliminary analyses indicate that this may be attributed to the inclusion of certain critical elements in the crystal.CsI(T1) after irradiation does not exhibit strong afterglow of noticeable coloration as were reported in the literature. 相似文献
7.
The cross section measurement for the reaction 56Fe(n, p)56Mn was made using the activation method from 12 MeV to 18 MeV. The absolute cross section was determined at 14.61±0.20 MeV, the value obtained was 108.0±2.7mb. The associated particle method was used to determine the absolute neutron flux and compared with the recoil proton telescope. The agreement between both methods appeared to be within 1—2%. The resulting 56Mn activity was measured by using a φ10×7.6cm NaI (Tl) scintillation counter. The counting efficiency of the counter was achieved by means of a standard 56Mn source calibrated by the 4πβ-γ coincidence method. The result measured was compared with existing data. 相似文献
8.
M.G. Albrow D.P. Barber P. Benz B. Bošnjaković J.R. Brooks C.Y. Chang A.B. Clegg F.C. Erné P. Kooijman F.K. Loebinger N.A. McCubbin P.G. Murphy D. Radojicic A. Rudge J.C. Sens A.L. Sessoms J. Singh P. Strolin J. Timmer 《Nuclear Physics B》1976,102(2):275-296
Data on correlations between momentum analysed protons, pions or K mesons, and charged particles produced in pp collisions at the CERN ISR are presented. The charged particles were detected in a ~4π scintillation counter hodoscope. The pseudo-rapidity distributions are well described by production within the limits of cylindrical phase space, with negative kaons and antiprotons yielding narrower distributions than protons, pions and positive kaons. The azimuthal distributions show symmetry around the t-channel axis in the rest frame of the recoiling mass Mx in pp → aX (a = detected proton, pion, positive kaon). 相似文献
9.
LONG Ao JIAO Tian-Shu CHANG Li CHANG Geng-Fu DANG Jian-Rong GUO Ke-Jun ZHANG Chang-Shuan WU Gui-Heng YU Wen-Jie ZHANG Guo-Bin WANG Wen-Ling 《中国物理C(英文版)》1987,11(3):419-425
HIRFL magnetic field measuring system was built in October, 1983. There are 94 Hall probes on a detecting arm. The positioning device, which mainly consists of a detecting arm, a rotating ring and a fixed ring, is of a polar coordinate type. For 16KG magnetic field, the measuring repeatability of the system is better than ±5×10-5, the measuring accuracy is about ±1×10-4. The measuring rate is about 188 data per minute. 相似文献
10.
The construction,operation principle and performance of a parallel plate avalanche counter with an active area of 60×400mm2 and another one with an active area of 70×140mm2 and one dimensional position sensitivity are described in detail.It is discussed how to combine a large solid angle time-of-flight setup by using the two counters described above. 相似文献
11.
Two large area plastic scintillation counters (50cm×50cm and 50cm×100cm, 0.5cm thick) have been built with the scintillator type ST-401 made in China. The characteristic parameters of the counters, such as the attenuation length and the detection efficiency have been measured. The results show that the quality of the counters is desirable and that they can be used as trigger counters in experiments of high energy physics. 相似文献
12.
Non-Reproducibility of the Cross Sections of the Products Induced from Dissipative Reaction of 17F+27Al
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HAN Jian-Long WANG Qi DONG Yu-Chuan LI Song-Lin DUAN Li-Min WU He-Yu XU Hua-Gen CHEN Ruo-Fu XU Hu-Shan BAI Zhen LI Zhi-Chang LU Xiu-Qin ZHAO Kui 《中国物理C(英文版)》2006,30(2):108-112
The differential cross sections of the dissipative products B, C, N, O, F, Ne, Na and Mg induced from the reactions of 19F+27Al at two incident energies have been measured at the HI-13 tandem accelerator, Beijing. In the case of a fixed beam incident energy 114MeV or 118.75MeV respectively, identical reaction system and the same detection system, 20 target points in steps of 2mm on a 10mm×50mm rectangular Al foil have been bombarded. The experimental results indicate that the probability distribution of the cross sections is much wider than a standard Gaussian distribution. This non-reproducibility of the cross sections can't be interpreted by the statistical property of a finite count rate. 相似文献
13.
BES Collaboration 《中国物理C(英文版)》1998,22(2):97-105
The channels of J/ψ decay into,ΛΛ,ΛΛγ and ΛΛπ0 are analyzed with 7.8×106 J/ψ events collected by BES detector at BEPC Collider.The branching ratios for three channels and the angular distribution for the first channel are measured.The branching ratios are Br(J/ψ→ΛΛ)=(l.08±0.06±0.24)×10-3,Br(J/ψ→ΛΛγ)-4(90% CL)and Br(J/ψ→ΛΛπ0)=(2.3±0.7±0.8)×l0-4 respectively. The angular distribution for J/ψ→ΛΛ is dN dcosθ=N0(1+αcos20),α=0.52±0.33±0.13. 相似文献
14.
V. N. Goryachev S. P. Denisov A. V. Kozelov A. A. Shchukin 《Physics of Particles and Nuclei》2018,49(1):42-46
The characteristics of scintillation counters measured in a 90-MeV proton beam have been presented. Two-meter long scintillators BC-404 and BC-408, which were viewed from both ends with photoelectron multipliers R1828-01 (PMT) have been used. Both the amplitude and time distributions of the PMT signals are well described by the Gaussian function. It turned out that the amplitude resolution σ(А)/А weakly depends on the type of scintillator and the proton position along the counter, and lies in the interval between 4 and 5%. The best time resolution σ(T) is about 50 ps near the counter ends and 63 ps at the center. 相似文献
15.
The New CHOD is a scintillation hodoscope with a pad structure featuring a total of 148 counters. The signal from each pad is read out using wavelength-shifting fibers and two or four SensL SiPMs with a sensitive area of 3 × 3 mm2. This photodetector has 4774 pixels 35 × 35 μm2 in size. The key parameters (photon detection efficiency, dark current, crosstalk, and gain) were measured for 500 SiPMs. 相似文献
16.
YOU Ke ZHU Yu-Can LV Jun-Guang SUN Han-Sheng TIAN Wei-Hua ZHAO Wen-Heng ZHENG Zhi-Peng YE Ming-Han QING Cheng-Rui HE Zuo-Xiu CUI Feng-Zhu YU Chang-Jiang 《中国物理C(英文版)》1991,15(11):966-972
A search for the neutrinoless double beta decay of 48Ca is carried out in a coal mine which is located 512m underground near Beijing.Large scintillation crystals of natural CaF2 were used as both the detector and the double beta decay source.Result obtained after a total of 7588.5 hours of data taking gives 1.1×1022 years (68%C.L.) as the lower limit of the half-life of the neutrinoless double beta decay of 68Ca. 相似文献
17.
MONTE-CARLO CALCULATION ON ACHIEVABLE ACCURACY OF TAU LIFETIME MEASUREMENT BY USING TEC TYPE VERTEX CHAMBER IN e+e- INTERACTION AT CENTER OF MASS ENERGY √s =40GeV
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ZHU Yong-Sheng 《中国物理C(英文版)》1984,8(5):513-522
The most accurate tau lifetime measurement in e+e- experiments by now is reported by MARK Ⅱ with the value (3.20±0.41±0.35)×10-13 sec. wherein the second and the third terms are statistical and systematic errors respectively. By using TEC (Time Expansion Chamber) type vertex chamber with position resolution 40μ in r-φ plane at similar experimental condition (∫Ldt=40pb-1), MONTE-CARLO calculation shows: at center of mass energy √s =40GeV the statistical error of tau lifetime can be decreased to 0.13×10-13 sec. and the systematic error is in a comparable value. 相似文献
18.
E. P. Jacosalem S. Iba N. Nakajima H. Ono A. L. C. Sanchez A. M. Bacala H. Miyata GLD Calorimeter Group 《Pramana》2007,69(6):1051-1056
A new sampling calorimeter using very thin scintillators and the multi-pixel photon counter (MPPC) has been proposed to produce
better position resolution for the international linear collider (ILC) experiment. As part of this R&D study, small plastic
scintillators of different sizes, thickness and wrapping reflectors are systematically studied. The scintillation light due
to beta rays from a collimated 90Sr source are collected from the scintillator by wavelength-shifting (WLS) fiber and converted into electrical signals at
the PMT.
The wrapped scintillator that gives the best light yield is determined by comparing the measured pulse height of each 10 ×
40 × 2 mm strip scintillator covered with 3M reflective mirror film, teflon, white paint, black tape, gold, aluminum and white
paint+teflon. The pulse height dependence on position, length and thickness of the 3M reflective mirror film and teflon wrapped
scintillators are measured.
Results show that the 3M radiant mirror film-wrapped scintillator has the greatest light yield with an average of 9.2 photoelectrons.
It is observed that light yield slightly increases with scintillator length, but increases to about 100% when WLS fiber diameter
is increased from 1.0 mm to 1.6 mm. The position dependence measurement along the strip scintillator showed the uniformity
of light transmission from the sensor to the PMT. A dip across the strip is observed which is 40% of the maximum pulse height.
The block type scintillator pulse height, on the other hand, is found to be almost proportional to scintillator thickness.
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19.
Totally active and magnetic segmented scintillation neutrino detectors are developed for the nextgeneration accelerator neutrino experiments. Such detectors will incorporate scintillation modules with scintillation counters that form X and Y planes. A single counter is a 7 × 10 × 90 mm3 scintillation bar with gluedin wavelength-shifting fibers and micropixel avalanche photodiodes. The results of measurements of the parameters of these detectors are presented.
相似文献20.
H. Schölermann 《Zeitschrift für Physik A Hadrons and Nuclei》1969,220(3):211-217
The angular distribution of the polarization of neutrons from the reaction13C(α,n)16O has been determined between 1.38 and 2.26 MeV energy of the α-particles by left-right asymmetry induced by elastic scattering from4He. The neutrons were detected by a time-of-flight method between a helium gas scintillation counter and two plastic scintillation counters. From Simon and Welton theory analysis a set of spectroscopic data has been obtained for seven states of the compound nucleus17O. 相似文献