EFFICIENCY CALIBRATION OF LARGE VOLUME LIQUID SCINTILLATION DETECTORS

被引：12

作者：

MELLEMA, S ^{[1
]}

PETLER, JS ^{[1
]}

机构：

[1] OHIO UNIV,DEPT PHYS,ATHENS,OH 45701

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1986年 / 242卷 / 02期

关键词：

Fast neutron elastic and inelastic differential cross sections are measured by time-of-flight (TOF) techniques which usually employ liquid scintillation detectors. The most popular liquid scintillator for this application is NE213 which exhibits good timing properties as well as excellent neutron/v-ray pulse shape discrimination (PSD). A typical experimental setup consists of a (pulsed and bunched) neutron source; a scattering sample located 10-20 cm from the source; and the neutron detector itself located 5-25 m from the sample and shielded from the source neutrons. The source-sample-detector angle must be variable in order to measure differential cross sections as a function of laboratory scattering angle. The scattered neutrons are detected and their TOF determined from the detector signal and the timing of the pulsed beam. A measured spectrum may consist of several neutron TOF groups from different excited states in the target nucleus. In order to extract absolute cross sections for each of these states; it is necessary to know the number of source neutrons which were incident upon the scattering sample during the measurement. While direct measurement of this quantity is not practical; it may be determined in several ways. Perhaps the easiest method involves the use of a neutron monitor detector which remains in a fixed position (in angle and distance) with respect to the source throughout the experiment. Both * Supported by National Science Foundation grant PHY-8108456 and by PHS grant number 5-R01-CA25193 awarded by the National Cancer Institute; DHHS. ** Present address: Physics Department; University of Wisconsin-Madison; Madison; WI; 53706; USA. *** Present address: Exploration Division; British Petroleum Research Centre; Sunbury-on-Thames; Middlesex; UK;

D O I：

10.1016/0168-9002(86)90219-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

引用

页码：265 / 269

页数：5

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