The 1H(n,n)1H scattering observables required for high-precision fast-neutron measurements

Hopkins, J.C.; Breit, G.

doi:10.1016/s0092-640x(71)80038-4

Cited by 131 publications

(24 citation statements)

References 5 publications

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“…Scattered-neutron flight paths were in the range 5 to 7 m giving scattered neutron resolutions of g0.5 nsec/m. Most of the scattering cross sections were determined relative to the known H(n, n) differential scattering cross section [9] and the remainder were made relative to the C(n; n) differential elastic scattering cross section [10]. Results obtained with these two standards at identical incident neutron energies were consistent.…”

Section: Experimental Methodsmentioning

confidence: 96%

Neutron total and scattering cross sections of niobium in the continuum region

1973

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Neutron total and elastic and inelastic scattering cross sections of niobium are measured in the incident energy interval 0.25 to 0.5 MeV. Total neutron cross sections are determined to a few per cent accuracy throughout the energy interval. Differential elastic and inelastic neutron scattering cross sections are measured at ~,, 20 scattering angles distributed between 20 and 160 degrees and at incident neutron energy intervals of 0.1 MeV from 1.8 to 4.0 MeV. The cross sections for the inelastic neutron excitation of 11 states with Q-values of --*2 520 keV are quantitatively measured and the excitation of an additional 8 states qualitatively observed. Calculations based upon a selected optical potential give a good description of total neutron cross sections to 20.0 MeV and of elastic scattering cross sections extending from low energies where compoundnucleus processes are prominent to high energies where" shape" scattering predominates. Inelastic neutron scattering cross sections are calculated from the optical potential and statistical theory and comparison with the corresponding experimental values suggests the spins and parities of the low-energy excited states.

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Section: Experimental Methodsmentioning

confidence: 96%

Neutron total and scattering cross sections of niobium in the continuum region

1973

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“…They have allowed us to determine the neutron energy spectrum hitting the 243 Am targets or the PP foil. The simulations took into account the resolution of the charged particle beam, the energy loss of the charged particle beam in the deuterium or tritium targets, the angular distributions of the neutron beam, the angular distribution of the (n,p) elastic scattering cross sections [9] [10], the proton energy loss in the PP foil, and the energy resolution of the Si telescope. When the simulated proton spectrum is in agreement with the experimental result ( Fig.…”

Section: Neutron Flux Measurements In Reference To the (Np) Elastic mentioning

confidence: 99%

“…In order to solve this controversy, we have measured the 243 Am fission cross section in reference to the neutron-proton (n,p) elastic scattering cross section, which is known with a precision better than 0.5%, over a wide neutron-energy range of1 MeV to 20 MeV [9,10]. This is the first time such measurements have been performed.…”

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confidence: 99%

243Am neutron-induced fission cross section in the fast neutron energy range

et al. 2012

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The existing evaluations of the 243Am neutron-induced fission cross section have been questioned by recent measurements performed at the GNEISS facility. In the neutron energy range from 1 to 6 MeV, the GNEISS data present deviations of more than 15% with respect to the evaluations. In order to solve this problem, we have measured this cross section in reference to three different standard cross sections. The first standard reaction used corresponds to the neutron on proton elastic scattering cross section, which is known with a precision better than 0.5 % over a wide range of neutron energies (1 meV to 20 MeV). The other two experiments were conducted in reference to the 235 U(n,f) and 238 U(n,f) reactions. The comparison between these three standard reactions ensures that systematic parameters have been correctly evaluated. Moreover, a sensitivity analysis of parameters and correlations of parameters is described and a complete variance-covariance matrix of the measurements is presented and discussed.

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“…The relative energydependent efficiency of each detector was determined by the observation of neutrons scattered at various angles from hydrogen at a fixed incident energy or by observation of neutrons emitted following the spontaneous fission of 252 Cf; or by both methods. The normalization of these relative sensitivity distributions was determined using to the well-known H(n;n) cross section at each incident energy (13). These detector calibration procedures provided a good knowledge of detector sensitivities over the rather wide energy range encountered in scattering from the light nucleus 6 Li.…”

Section: B Differential Neutron Scattering Measurementsmentioning

confidence: 99%