Average Number of Prompt Neutrons from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mrow><mml:mn>235</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Fission Induced by Neutrons from Thermal to 8 MeV

Mather, D.S.; Fieldhouse, P.; Moat, A.

doi:10.1103/physrev.133.b1403

Cited by 52 publications

(8 citation statements)

References 27 publications

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“…Figure 10 shows the measured fission spectra for a set of higher neutron ranges. It is clear from the increased amplitude that the average number of neutrons generated (ν) increases with fission-neutron energy; this has commonly been shown for lower energy ranges [15,16]. Here it is clearly shown that the trend continues rapidly also beyond 20 MeV.…”

Section: Neutron Energy Dependencementioning

confidence: 51%

Neutron-induced235U fission spectrum measurements using liquid organic scintillation detectors

et al. 2012

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Measurements have been performed at Los Alamos Neutron Science Center to acquire neutron fission spectra of 235 U in the energy range between 0.5 and 10 MeV. These new data complement the currently available experimental data, which are not well known in the energy range below 1 and above 5 MeV. Organic liquid scintillation detectors (EJ-309s) were used together with a digital data-acquisition system. The EJ-309 detectors show excellent pulse shape discrimination capabilities and this is vital for identifying only neutron pulses and rejecting γ -ray pulses. The measurement data show the dependence of average fission neutron energy as a function of the inducing neutron energy. The data agree well with previously published measurements and Watt spectra fits for energies up to tens of MeV. At high fission-inducing neutron energies the spectrum deviates from Watt-spectra fits. The increased energy deposited in higher energy neutron-induced fissions does not significantly increase emitted fission neutron energies for up to 10 MeV. A significant decrease in neutron energy around second-chance fission cannot be observed beyond the current measurement uncertainties.

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Section: Neutron Energy Dependencementioning

confidence: 51%

Neutron-induced235U fission spectrum measurements using liquid organic scintillation detectors

et al. 2012

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“…Having verified the assumptions, ordinary crude Monte Carlo methods were deliberately used for a series of monoenergetic neutron sources. Even the shape of the scintillator, which is spherical apart from a small cylindrical neutron beam tube (Mather et al, 1964) was (quite deliberately) not accurately simulated, though careful calculations to provide an upper bound for the effect of this approximation were mounted. Many sophisticated ways of carrying out the tracking, and modifying the scoring processes, were considered briefly only to be rejected.…”

Section: Monte Carlo Studies Of Scintillator Efficienciesmentioning

confidence: 99%

The Use of the Monte Carlo Method for Solving Large-Scale Problems in Neutronics

Parker¹

1972

Journal of the Royal Statistical Society. Series A (General)

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“…cit. ), this energy is lost by the fissioning nucleus, and recent investigations would place its amount as 6 MeV, on the average, rather than any smaller quantity (see Mather et al 1964). Now Ramanna et al describe their hypothetical process of alpha particle emission as an "evaporation" process.…”

Section: General Considerationsmentioning

confidence: 99%

XVIII.—The Emission of Long-Range Alpha Particles in Fission

Feather

1963

Proc. Sect. A, Math. phys. sci.

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It is generally agreed that the long-range alpha particles of fission are set free before the fragment nuclei have acquired more than a small fraction of their final energy of separation, but whether the alpha particle is liberated before the instant of scission, at that instant, or from one of the fragment nuclei very shortly thereafter, has remained an open question. Each of these views has been seriously advocated. These various hypotheses are examined in relation to recently published information regarding the distribution of mass in low-eneigy ternary fission, and other considerations, and it is suggested that the hypothesis having the strongest claim to attention is that which assumes that the alpha particles originate in the heavy fragments exclusively, being liberated, very shortly after the instant of scission, with probability not much less than unity, from fragment nuclei of low yield and small neutron excess. Conclusions which would follow, if this hypothesis were accepted, are indicated, and possible experimental tests of these conclusions are suggested.

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Average Number of Prompt Neutrons fromU235Fission Induced by Neutrons from Thermal to 8 MeV

Cited by 52 publications

References 27 publications

Neutron-induced235U fission spectrum measurements using liquid organic scintillation detectors

Neutron-induced235U fission spectrum measurements using liquid organic scintillation detectors

The Use of the Monte Carlo Method for Solving Large-Scale Problems in Neutronics

XVIII.—The Emission of Long-Range Alpha Particles in Fission

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