Nuclear Fission

S, Fraser, J; Milton, J C D

doi:10.1146/annurev.ns.16.120166.002115

Cited by 66 publications

(13 citation statements)

References 50 publications

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“…For comparison, Fig. 4 also shows three previous dataC 3 )( io) ( 28 ). The present result agrees with all of them in the light fragment region except below 90 amu.…”

Section: Neutron Multiplicitysupporting

confidence: 90%

Simultaneous Measurement of Prompt Neutrons and Fission Fragments for 239Pu(nth, f).

Tsuchiya

Nakagome

Yamana

et al. 2000

J. Nucl. Sci. Technol.

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The multiplicity and energy of the prompt neutrons emitted from the fission fragments for 239 Pu(nth, f) were measured as functions of the fragment mass and total kinetic energy. The results were compared with those for 233 U(nth, f) and with the predicted values by the multi-channel fission theory with the random neck rupture model.The measured and predicted values of the neutron multiplicity, (v)(m*), show the saw-tooth trend and agree with each other. The total neutron multiplicity decreases linearly with increasing total kinetic energy resulting in -d(TKE)/d(vt 0 t)=16.5±0.4MeV/neutron. The slope of the neutron multiplicity vs. the total kinetic energy, -d(v) / d(T KE), was plotted against the fragment mass. Its shape agrees with that for 233 U(nth, f).The average neutron emission energy, (rJ)(m*), follows a bell shape about the symmetric fission accompanying higher values for very asymmetric fissions and agrees with that for 233 U(nth, f). The total excitation energy (TXE)(m*) was determined by two manners: (1) neutron data and (2) Qmax-(TKE). Both results satisfactorily agree with each other as the case of 233 U(nth, f), and thereby the present derivation of (TKE) from the neutron data is confirned.

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“…For comparison, Fig. 4 also shows three previous dataC 3 )( io) ( 28 ). The present result agrees with all of them in the light fragment region except below 90 amu.…”

Section: Neutron Multiplicitysupporting

confidence: 90%

Simultaneous Measurement of Prompt Neutrons and Fission Fragments for 239Pu(nth, f).

Tsuchiya

Nakagome

Yamana

et al. 2000

J. Nucl. Sci. Technol.

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“…235 U + n th ν(A) distributions as obtained by DELFIN using GEF (R R), PbP (--) and FREYA(FF) (R R) are compared to experimental data [7][8][9][10].…”

Section: A Word Of Caution: E Rotmentioning

confidence: 99%

“…The Point-by-Point (PbP) model [5], calculations with the FREYA code 1 [6] and the GEF output were all processed and compared: the results are shown in Fig. 3 compared to a sample of available experimental data [7][8][9][10].…”

Section: U(n Th F)mentioning

confidence: 99%

A methodology for the intercomparison of nuclear fission codes using TALYS

et al. 2017

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Abstract. Codes for the calculation of fission observables are frequently used to describe experimentally observed phenomena as well as provide predictions in cases where measurements are missing. Assumptions in the models, and tuning of parameters within the codes, often result in a good reproduction of experimental data. In this work we propose a methodology, coded in the newly developed program DELFIN (De-Excitation of FIssion fragmeNts), that can be used to compare some of the assumptions of the various models. Our code makes use of the fission fragments information after scission and processes them in an independent and consistent fashion to obtain measurable fission observables (such asν(A) distributions and Isomeric Fission Yield ratios).All the available information from the models, such as fragments' excitation energies, spin distributions and yields are provided as input to DELFIN that uses the nuclear reaction code TALYS to handle the deexcitation of the fission fragments. In this way we decouple the fragments relaxation from the actual fission models.We report here the first results of a comparison carried out on the GEF, Point-by-Point and FREYA models for thermal fission of 235 U and 239 Pu and spontaneous fission of 252 Cf.

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“…Reactors are concerned with neutron-induced fission and the interest is dual; there is firstly the experimental investigation of the detailed behaviour with the hope that eventually a comprehensive explanatory theory will be developed (Whitehouse 1952, Halpern 1959, Fraser and Milton 1966, and secondly there is the interest in fission as the very basis of nuclear reactors (Hanna 1965, Westcott et al 1965. The latter interest is more restricted than the former but would still include the following: cross sections (Bollinger 1965) with a special interest in resonances, thresholds and the ratio of radiative capture to fission ( E = C T , ,~/~, ,~) ; the number of neutrons released on fission and their energy distribution ; fission products, particularly those with strong neutron absorption and those associated with delayed neutrons, and the time dependence of the beta and gamma radiations from the fragments.…”

Section: Nuclear Physicsmentioning

confidence: 99%

Molecular Alignments Studied by X-Ray Diffraction Analysis and Optical Properties of Vacuum-Deposited Thin Films of Thiophene–Pyridine Co-Oligomers

Kumagai¹,

Fujiwara²,

Fukumoto³

et al. 2006

jjap

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An X-ray diffraction study of vacuum-deposited films of thiophene–pyridine co-oligomers on a sapphire substrate indicated a perpendicular or perpendicular-like alignment of the co-oligomers on the surface of the substrate. The UV-vis peak of the vacuum-deposited films shifted to a shorter wavelength from that observed in solutions. The UV-vis data support the notion that the co-oligomer in the vacuum-deposited film assumes a twisted conformation.

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Nuclear Fission

Cited by 66 publications

References 50 publications

Simultaneous Measurement of Prompt Neutrons and Fission Fragments for 239Pu(nth, f).

Simultaneous Measurement of Prompt Neutrons and Fission Fragments for 239Pu(nth, f).

A methodology for the intercomparison of nuclear fission codes using TALYS

Molecular Alignments Studied by X-Ray Diffraction Analysis and Optical Properties of Vacuum-Deposited Thin Films of Thiophene–Pyridine Co-Oligomers

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