Neutron and Gamma-Ray Spectra from a Variety of Materials Bombarded with 14-MeV Neutrons

Goldberg, Eugene P.; Hansen, L. F.; Komoto, T.; Pohl, B.A.; Howerton, R.J.; Dye, R.E.; Plechaty, E.F.; Warren, W. E.

doi:10.13182/nse90-a21468

Cited by 20 publications

(6 citation statements)

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“…The pulsedsphere program, which ran from the 70's to the early 90's, measured neutron time-of-flight (TOF) and gamma spectra resulting from emission of a 14 MeV neutron pulse produced by d+t reactions occurring inside spheres composed of a variety of materials [58]. Models of the LLNL pulsed-sphere experiments using the Mercury Monte Carlo were developed for the materials reported in Goldberg et al [59,60]. Figure 20 compares results of our evaluation with the experimental data [58] and calculations based on ENDF/B-VII.0.…”

Section: Validation With Llnl Pulsed Spheresmentioning

confidence: 99%

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

et al. 2012

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Section: Validation With Llnl Pulsed Spheresmentioning

confidence: 99%

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

et al. 2012

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“…The experimental results were higher by about 6% compared with computations. In 1990, the ERS of 0.17 to 6 MeVee was measured, and the ERS agrees well with the simulation below 4 MeVee [19], but the details of the γ-ray time spectrum were not reported. Other highly cited experiments were performed on the Si, W, Pb, Cu, V and other benchmark assemblies at the Japan Atomic Energy Institute and Osaka University from 1989 to 1994 [22][23][24].…”

Section: Introductionmentioning

confidence: 54%

“…The benchmark data obtained in integral experiments with macroscopic samples can be used to evaluate cross sections and check databases. One such experiment is the pulsed spheres experiment [18][19][20][21] conducted in LLNL in 1989, in which the electron recoil spectra (ERS) of 238 U spherical shell sample were investigated under D-T neutron irradiation. The inner and outer radii of the uranium sphere shell were 3.63 cm and 10.91 cm, respectively, and the energy of the γ-rays was between 0.5 and 8 MeV.…”

Section: Introductionmentioning

confidence: 99%

Method for measuring prompt γ -rays generated by D-T neutrons bombarding a depleted uranium spherical shell

Qin¹,

Lai²,

Li³

et al. 2016

Chinese Phys. C

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The prompt γ-ray spectrum from depleted uranium (DU) spherical shells induced by 14 MeV D-T neutrons is measured. Monte Carlo (MC) simulation gives the largest prompt γ flux with the optimal thickness of the DU spherical shells 3–5 cm and the optimal frequency of neutron pulse 1 MHz. The method of time of flight and pulse shape coincidence with energy (DC-TOF) is proposed, and the subtraction of the background γ-rays discussed in detail. The electron recoil spectrum and time spectrum of the prompt γ-rays are obtained based on a 2″×2″ BC501A liquid scintillator detector. The energy spectrum and time spectrum of prompt γ-rays are obtained based on an iterative unfolding method that can remove the influence of γ-rays response matrix and pulsed neutron shape. The measured time spectrum and the calculated results are roughly consistent with each other. Experimental prompt γ-ray spectrum in the 0.4–3 MeV energy region agrees well with MC simulation based on the ENDF/BVI.5 library, and the discrepancies for the integral quantities of γ-rays of energy 0.4–1 MeV and 1–3 MeV are 9.2% and 1.1%, respectively.

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“…The pulsedsphere program, which ran from the 70's to the early 90's, measured neutron time-of-flight (TOF) and gamma spectra resulting from emission of a 14 MeV neutron pulse produced by d+t reactions occurring inside spheres composed of a variety of materials [57]. Models of the LLNL pulsed-sphere experiments using the Mercury Monte Carlo were developed for the materials reported in Goldberg et al [58,59]. Figure 21 compares results of our evaluation with the experimental data [57] and calculations based on ENDF/B-VII.0.…”

Section: G Validation With Llnl Pulsed Spheresmentioning

confidence: 99%

Event-by-event evaluation of the prompt fission neutron spectrum from 239Pu(n, f)

Vogt,

Randrup,

Brown

et al. 2011

Preprint

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Earlier studies of 239 Pu(n, f ) have been extended to incident neutron energies up to 20 MeV within the framework of the event-by-event fission model FREYA, into which we have incorporated multichance fission and pre-equilibrium neutron emission. The main parameters controlling prompt fission neutron evaporation have been identified and the prompt fission neutron spectrum has been analyzed by fitting those parameters to the average neutron multiplicity ν from ENDF-B/VII.0, including the energy-energy correlations in ν(E) obtained by fitting to the experimental ν data used in the ENDF-B/VII.0 evaluation. We present our results, discuss relevant tests of this new evaluation, and describe possible further improvements.

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Neutron and Gamma-Ray Spectra from a Variety of Materials Bombarded with 14-MeV Neutrons

Cited by 20 publications

References 0 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)

Method for measuring prompt γ -rays generated by D-T neutrons bombarding a depleted uranium spherical shell

Event-by-event evaluation of the prompt fission neutron spectrum from 239Pu(n, f)

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