CORRECTING TIME-OF-FLIGHT NEUTRON-DIFFRACTION DATA FOR CHOPPED DELAYED NEUTRON BACKGROUNDS - THE ACTION OF A DRUM CHOPPER IN A PULSED NEUTRON BEAM

被引：2

作者：

CARPENTER, JM ^{[1
]}

MILDNER, DFR ^{[1
]}

RICHARDSON, JW ^{[1
]}

机构：

[1] NATL INST STAND & TECHNOL,CTR ANALYT CHEM,GAITHERSBURG,MD 20899

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1991年 / 301卷 / 02期

关键词：

D O I：

10.1016/0168-9002(91)90473-4

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Delayed neutron choppers in pulsed source neutron beams serve to reduce the background caused by delayed neutrons in pulsed source instruments. We analyze the effect of a drum chopper placed in an incident pulsed beam which contains delayed neutrons and compute its influenced on the detector counting rate. Expressions are found for the time and wavelength dependence of the counting rates for both prompt and delayed neutrons, in both the monitor and the scattered neutron detectors. On the basis of these results, an exact method for determining the delayed neutron background is suggested for use in measuring and correcting pulsed-source diffractometer data, by operating the chopper in random phase with respect to the source. Other approximate methods are investigated. We report measurements which confirm the analysis.

引用

页码：305 / 314

页数：10

共 6 条

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1991, 301 (02) :315-327

[2]

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[3] MEASUREMENT OF THE DELAYED NEUTRON FRACTION AND CORRECTION OF SMALL-ANGLE SCATTERING DATA FROM A PULSED SPALLATION SOURCE [J].

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HEUSER, B .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1990, 289 (1-2) :30-34

[4] ELECTRONICALLY FOCUSED TIME-OF-FLIGHT POWDER DIFFRACTOMETERS AT THE INTENSE PULSED NEUTRON SOURCE [J].

JORGENSEN, JD ;

FABER, J ;

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[5]

KNOX AE, 1987, 9TH P M INT COLL ADV, P557

[6]

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