Systematic Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of Zr Isotopes

Ohgama, Kazuya

doi:10.1063/1.1945160

Cited by 11 publications

(16 citation statements)

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“…The cross sections for 90;92;94 Zr were normalized to the data measured at Tokyo Institute of Technology. [121][122][123] Figure 20 shows a result for 90 Zr. The angular distribution data (the Legendre expansion coefficients) of neutron elastic scattering were also replaced by the POD calculations using the OMPs of Koning and Delaroche 23) above 6 MeV in order to improve the reproducibility of experimental data.…”

Section: )mentioning

confidence: 99%

JENDL-4.0: A New Library for Nuclear Science and Engineering

Shibata

Iwamoto

Nakagawa

et al. 2011

J. Nucl. Sci. Technol.

169

152

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The fourth version of the Japanese Evaluated Nuclear Data Library has been produced in cooperation with the Japanese Nuclear Data Committee. In the new library, much emphasis is placed on the improvements of fission product and minor actinoid data. Two nuclear model codes were developed in order to evaluate the cross sections of fission products and minor actinoids. Coupled-channel optical model parameters, which can be applied to wide mass and energy regions, were obtained for nuclear model calculations. Thermal cross sections of actinoids were carefully examined by considering experimental data or by the systematics of neighboring nuclei. Most of the fission cross sections were derived from experimental data. A simultaneous evaluation was performed for the fission cross sections of important uranium and plutonium isotopes above 10 keV. New evaluations were performed for the thirty fissionproduct nuclides that had not been contained in the previous library JENDL-3.3. The data for light elements and structural materials were partly reevaluated. Moreover, covariances were estimated mainly for actinoids. The new library was released as JENDL-4.0, and the data can be retrieved from the Web site of the JAEA Nuclear Data Center.

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Section: )mentioning

confidence: 99%

JENDL-4.0: A New Library for Nuclear Science and Engineering

Shibata

Iwamoto

Nakagawa

et al. 2011

J. Nucl. Sci. Technol.

169

152

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“…The slight increase around 1.5 MeV was obtained by applying the correction function given by Eq. (13). In order to confirm whether our method is reasonable for neutrons with various incident energies or not, we compared our results to the ENDF/B-VI.8 evaluation and to the experimental data.…”

Section: Resultsmentioning

confidence: 99%

“…The representative example is the anomalous bump shown in the experiments of the capture gamma-ray spectra. [7][8][9][10][11][12][13] According to a theoretical analysis and experiments, the bump could be considered to have the electric or magnetic properties of decaying gamma similar to the giant electric or magnetic resonances. So far, the bump has not been regarded as an essential nuclear property because it does not TECHNICAL MATERIAL affect significantly the capture cross sections, nor does it provide a sufficient enhancement of the high energy gammarays observed in the experiments.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Neutron Capture Gamma-ray Spectra for 89Y, 93Nb, 127I, 133Cs, 141Pr, 197Au, natTl, and 209Bi

KIM

LEE

2007

J. Nucl. Sci. Technol.

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The neutron capture gamma-ray spectra for 8 nuclides, 89 Bi, were calculated by using the Hauser-Feshbach statistical model, and their results were compared with the available experimental data. Two dominant ingredients to perform the statistical calculation were the level densities described by the Gilbert-Cameron approach with an improved systematics, and the gamma-ray transmission coefficients described by gamma-ray strength functions. Although various gamma-ray strength functions with a Lorentzian formula have been developed by using the photonuclear data or a microscopic analysis, they have failed to reproduce the occasional anomalous bumps observed near or below a neutron binding. In this work, we could reproduce the bumps well by adding a Lorentzian with an energy-temperature dependent width into a giant electric dipole resonance with an enhanced generalized Lorentzian. In addition, we introduced a correction function so as to compensate for the shortcomings due to missing levels or level-cuts.

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“…The small or large 6 Li-glass detector was placed at an angle of 2.4 or 1. 4 , respectively, with respect to the proton beam direction to observe an average energy spectrum of incident neutrons on the capture sample. The small detector was used also in the 510 keV measurement to monitor the neutron production, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…5) Then, each -ray spectrum was normalized with the following equation: where E is the -ray energy and i; j ðE Þ is the capture -ray spectrum for region j of sample i. Due to the above normalization, the unit of the present -ray spectrum is ''Rays/ MeV/Capture'' and the integration of the -ray spectrum with respect to E gives the -ray multiplicity of the capture reaction.…”

Section: Capture -Ray Spectramentioning

confidence: 99%

Measurements of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of⁷⁷Se

Kamada

Igashira

Katabuchi

et al. 2010

Journal of Nuclear Science and Technology

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The neutron capture cross sections and capture -ray spectra of 77 Se were measured in a region from 15 to 100 keV and at around 510 keV. A neutron time-of-flight method was used with a ns-pulsed neutron source based on the 7 Li(p,n) 7 Be reaction and with a large anti-Compton NaI(Tl) -ray spectrometer. A pulse-height weighting technique was applied to the observed -ray pulse-height spectra to obtain capture yields. The capture cross sections were derived with errors less than 5%, by using the standard capture cross sections of 197 Au. The present results were the first experimental ones above the resolved resonance region, and compared with the evaluated values in JENDL-3.3, ENDF/B-VI.8, and ENDF/B-VII.0. The evaluated values in those libraries were smaller than the present results by 10-20% in the region from 15 to 100 keV. At around 510 keV, the values in JENDL-3.3 and ENDF/B-VII.0 were smaller than the present result by about 20%, but those in ENDF-VI.8 were larger than the present result by about 20%. The capture -ray spectra of 77 Se were derived by unfolding the observed capture -ray pulse-height spectra. The present results were the first experimental ones in the keV region.

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Systematic Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of Zr Isotopes

Cited by 11 publications

References 0 publications

JENDL-4.0: A New Library for Nuclear Science and Engineering

JENDL-4.0: A New Library for Nuclear Science and Engineering

Evaluation of Neutron Capture Gamma-ray Spectra for 89Y, 93Nb, 127I, 133Cs, 141Pr, 197Au, natTl, and 209Bi

Measurements of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of⁷⁷Se

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Systematic Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of Zr Isotopes

Cited by 11 publications

References 0 publications

JENDL-4.0: A New Library for Nuclear Science and Engineering

JENDL-4.0: A New Library for Nuclear Science and Engineering

Evaluation of Neutron Capture Gamma-ray Spectra for 89Y, 93Nb, 127I, 133Cs, 141Pr, 197Au, natTl, and 209Bi

Measurements of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of77Se

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Measurements of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of⁷⁷Se