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July 1989
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13 Reads
The paper describes a multisection 4π scintillation detector that is designed for neutron studies by multiplicity spectrometry and is based on NaI(Tl) crystals and a scintillating converter (n, γ) that contains a neutron absorber. It is shown that the use of a scintillating converter increases the registration efficiency and the quality of separation of events of radiative capture and fission with preservation of a low neutron background level.
December 1988
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15 Reads
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4 Citations
Soviet Atomic Energy
November 1988
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8 Reads
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4 Citations
Soviet Atomic Energy
September 1986
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8 Reads
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2 Citations
Soviet Atomic Energy
Alpha, equal to the ratio of the radiative-capture cross section of a neutron to the fission cross section, is one of the basic constants necessary for the optimization of reactors. In this paper the method of multiplicity spectroscopy was used to perform absolute measurements of alpha for plutonium 239 for allowed resonances in the neutron energy range 7-200 eV. Two different detectors and correspondingly two different methods for separating the fission multiplicity spectra from the total measured multiplicity spectra were used. Measurements were performed on the 26-meter path of the LUE-60 Fakel linear accelerator. Boron 10, cadmium, and cadmium oxides filters were used to absorb recycling neutrons. A full description of the data acquisition system and spectrometer and a comprehensive analysis of the measurements, their accuracy, and their implications are given.
May 1985
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14 Reads
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41 Citations
A procedure for measuring neutron cross sections and their ratios based on the multiplicity spectrometry of gamma quanta and neutrons emitted by excited nuclei is considered. Multiplicity spectrometers are described, and their functional characteristics are presented. Results of the radiative capture of fissile nuclei and highly precise alpha value measurements are analyzed in detail. Certain results of the absolute alpha value measurement at **2**3**5U resonances over the energy range up to 35 ev are given. The accuracy of the data obtained is approximately 2%.
May 1985
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11 Reads
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4 Citations
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
The multiplicity spectrometry technique of secondary emission of nuclei excited by thermal neutrons for the neutron cross sections measurements is developed. A multisectional NaI(Tl) scintillation detector for gamma-ray detection with high efficiency and 4pi-geometry is used. The experiments are performed on a stationary 2 MW research reactor by the time-of-flight method. Such a method and apparatus are also to be used to measure the important neutron constant ``alpha'' (capture-to-fission ratio) for 235U.
April 1985
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7 Reads
Soviet Atomic Energy
October 1984
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5 Reads
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3 Citations
Soviet Atomic Energy
January 1983
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11 Reads
An absolute measurement of the alpha value at the Uranium-235 resonances has been performed. For most resonances the accuracy is better than 2% which considerably exceeds that of the available alpha values.
September 1980
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6 Reads
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5 Citations
In order to measure the neutron-physical constants with high accuracy and to investigate ways of formation and decay of excited nuclei a method has been developed at the I.V. Kurchatov AEI, based on the gamma-quanta and neutrons multiplicity spectrometry. During 1974-1978 there have been constructed a number of multisectional 4..pi..-detectors which have demonstrated great possibilities for this method. A detector permitting the required accuracy of measurements of neutron cross sections and their ratios has been chosen and designed on the basis of these works. The detector with 4..pi..-geometry has 46 sections and was based on naI(Tl) crystals with the total volume of the scintillator of approx. 100 1. The detector was used at the 26-m station. The results of U-235 absolute alpha value measurements are presented. The measurements are carried out over the energy range from 0.1 to 30 keV with the high accuracy - better than 5%. The equipment parameters and measurement conditions are listed. (WHK)
... There are different experimental techniques to tackle this problem. One of them is the γ -ray multiplicity methodology developed in the 1980s [16,17], recently applied by Danon et al. [8]. Another is the fission tagging technique [18], used by Jandel et al. [7] and in this work. ...
May 1985
... A short review of the experimental limits obtained on the spontaneous NPIR yields is presented in Table 1. The best experimental limit for π 0 -yields has been reported for 252 Cf by Bellini et al. [40]. They reached an upper limit of 3.10 ...
... Measurements of the multiplicity spectra for 235 U have been performed in the resonance energy region [1][2][3]to determine the fission, radiative capture and the a=s g /s f value. These measurements have shown that the use of the multiplicity radiation spectrometry method allows low methodical errors connected with the background and the normalization to supportable values. ...
October 1984
Soviet Atomic Energy
... There are different experimental techniques to tackle this problem. One of them is the γ -ray multiplicity methodology developed in the 1980s [16,17], recently applied by Danon et al. [8]. Another is the fission tagging technique [18], used by Jandel et al. [7] and in this work. ...
December 1988
Soviet Atomic Energy
... (Color online) Evaluated and calculated (n,γ) cross section for n+ 232−237 U compared to experimental data from EXFOR[125][126][127][128][129][130][131][132][133][134][135][136][137][138][139][140]. ...
November 1988
Soviet Atomic Energy
... Only a limited number of cross section measurements for the 92 Zr(n, γ ) reaction were carried out in the past [9][10][11][12][13][14][15]. Most of the information to evaluate resonance parameters and to subsequently derive Maxwellian averaged cross sections (MACSs) was obtained from the results of experiments carried out at ORELA [9] and n_TOF [15]. ...
April 1964
Nuclear Physics
... For the following statistical analysis, the resonance parameters below 100 eV were employed from the BNL-325 3rd edition (2). We would like to express our appreciation to the operation crew of the JAERI linac for stable accelerator operation. ...
July 1956
... The dash line presents the odd level. 11.56.N −0.552 , which is extracted from the odd-even mass difference [26]. Figure 5 illustrates the density of the neutron singleparticle spectra for the calcium isotopes 37-45 Ca. ...
December 1962
Nuclear Physics
