Prompt fission neutron energy spectra induced by fast neutrons

Staples, P.; Egan, J. J.; Kegel, G. H. R.; Mittler, A.; Woodring, Mitchell L.

doi:10.1016/0375-9474(95)00119-l

Cited by 52 publications

(71 citation statements)

References 10 publications

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“…The ENDF-B/VII.0 ratio is also shown, along with data from Refs. [41][42][43][44][45][46][47][48][49]. As expected from the comparison in Figs.…”

Section: B Fit Resultssupporting

confidence: 57%

“…We note that this procedure could introduce some bias into the result because a particular functional form has been assumed to obtain the integral normalization. In addition, these data are primarily for incident neutrons from thermal energies up to 0.5 MeV [41][42][43][44][45][46][47][48][49] although one group reported results for incident neutron energies up to 3.5 MeV [49]. Since the shape of the data reported in Ref.…”

Section: A Computational Approachmentioning

confidence: 99%

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Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

et al. 2012

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“…The ENDF-B/VII.0 ratio is also shown, along with data from Refs. [41][42][43][44][45][46][47][48][49]. As expected from the comparison in Figs.…”

Section: B Fit Resultssupporting

confidence: 57%

Section: A Computational Approachmentioning

confidence: 99%

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

et al. 2012

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“…The PFNS at 90 degree agrees with all previous measurements [2,[6][7][8][9][10] (see fig. 3), available in numerical form within an accuracy of smaller 10% in the prompt neutron energy range from 1-7 MeV.…”

Section: Resultssupporting

confidence: 91%

“…Even more, our data agree inside the error bars with the data of refs. [6,7] in the energy interval 0.7-5 MeV, with the data of Johansson et al [2] in the energy interval 3-12 MeV, and with the data of Staples et al [8] in the energy interval 1-8 MeV inside our error bars.…”

Section: Resultssupporting

confidence: 83%

“…However, between 1980 and 2000 new PFNS measurements have been carried out [6][7][8][9][10]. These microscopic experiments being in reasonable agreement with each other result in an average energy of the promptly emitted fission neutron smaller than required by benchmark experiments, macroscopic experimental data and the predictions by the MadlandNix model [1].…”

Section: Introductionmentioning

confidence: 84%

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New experimental and theoretical results for the ²³⁵U fission neutron spectrum

Kornilov

Hambsch

Fabry

et al. 2007

Nd2007

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Abstract. The prompt fission neutron spectrum (PFNS) was measured at 0.5 MeV incident neutron energy. An angular anisotropy in the prompt neutron emission was found. The neutron yield is ∼10% higher and the average energy ∼80 keV smaller at 90 degree than at 120 degree neutron emission angle. The spectral difference diminishes with increasing prompt neutron energy. The experimental data were successfully described with the semi-empirical "three sources" model.

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Neutron Cross Section Measurements

Block

Danon

Gunsing

et al. 2010

Handbook of Nuclear Engineering

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The main emphasis during the past year has been on analyzing and publishing results and the preparation for the impending start-up of the newly modified Nevis cyclotron. Papers on the separated isotopes of Yb and W have been submitted to the Physical Review. The published results on Er confirm Dyson's theory of level spacing systematics. The total cross section, resonance parameters and spin-parity values of Na below 300 keV have been submitted for publication. A report on the evaluation of the T's of U 238 has been distributed. We now have extensive results on the Er isotopes, 232 U, 152 > 15lt Sm, 151 , 153 Eu, Fe, La, In, Ta, F, Mg, Al, S, CI, K and Ca. A paper on the precision measurement of the 2200 m/sec neutron-proton capture cross section has been submitted for publication. The background for fission measurements has been extensively analyzed and modifications to the neutron source of the Nevis cyclotron will be made for the next run. New methods of analyzing low count rate data have been developed to eliminate observation of spurious levels. The captive cross sections of thulium and rhodium have been analyzed and the results reported. During the report period, our main emphasis has been on analyzing and publishing data, and the preparation for the impending startup of the newly modified Nevis cyclotron. A number of major papers and reports on our results have been published or submitted for publication. Papers on the neutron resonance spectroscopy and systematics of the separated Yb isotopes and the separated W isotopes have been submitted to the Physical Review. These papers round out our recent work on many of the rare earth isotopes, 150<_ A< 190, with a paper on the separated even Gd isotopes in preparation and tne separated Dy isotopes expected to be ready soon. The published paper on the Er isotopes, confirming Dyson's theories concerning level spacings systematics, has led to extensive Monte-Carlo theoretical studies by our group, partly on the basis of interactions with Professor Freeman Dyson. These studies have extended the understanding of the implications of the statistical orthogonal ensemble theory and have permitted a detailed comparison with our results for many even-even nuclei, 150 < A< 190, which supports this theory well for the first time. "The total cross section, resonance parameters and spin-parity values for Na below 300 keV has been submitted to Nuclear Science and Engineering for publication. An evaluation report on the total radiation widths of the important reactor material 238 U has concluded that there is no convincing evidence for quasi-periodic structure in r versus energy (apart from a statistical level to level fluctuation of a high chi-squared number of degrees of freedom). The fluctuations in r present in many data sets are most likely due to experimental uncertainties in the r values themselves. Our best evaluated average radiation width was taken to be = 23.55 + 0.16 meV. T We now have.extensive results for the resonance parameters and systematics for a large ...

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Prompt fission neutron energy spectra induced by fast neutrons

Cited by 52 publications

References 10 publications

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

New experimental and theoretical results for the ²³⁵U fission neutron spectrum

Neutron Cross Section Measurements

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Prompt fission neutron energy spectra induced by fast neutrons

Cited by 52 publications

References 10 publications

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)

New experimental and theoretical results for the 235U fission neutron spectrum

Neutron Cross Section Measurements

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New experimental and theoretical results for the ²³⁵U fission neutron spectrum