Prompt neutrons from the low-energy fission of atomic nuclei

Gerasimenko, B. F.; Rubchenya, V. A.

doi:10.1007/bf01133084

Cited by 9 publications

(1 citation statement)

References 5 publications

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“…Hauser-Feshbach models [7,12,16,50,57] (HFM) including the spin dependence of neutron emission in competition to gamma-ray and charged particle release.…”

Section: ( )mentioning

confidence: 99%

Physical Models

Корнилов¹

2014

Fission Neutrons

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We selected the process of the Prompt Fission Neutron Spectra (PFNS) analysis into two parts, or separate sections:1. Evaluation on the basis of semiempirical model, which allows us to compare of different experimental data, select wrong results, and give recommendations for data library creation; 2. Development of theoretical models, which first of all are addressed for understanding of the nature of prompt fission neutron (PFN) emission, explanation semiempirical relations, and of course made recommendations for data library, if the theoretical model agrees with experimental data in the whole energy range and for all isotopes. Or provide the recommendation for future experimental efforts, to understand problem and explain the mechanism of neutron emission in fission.This splitting of the problem has very simple explanation: till now we have a problem with theoretical modeling which can predict all sets of experimental data without tuning of model parameters, sometimes outside the reasonable range. The most important data for practical application are the neutron multiplicity as function of input neutron energy for main isotopes, and the shape of the PFNS. Therefore, main attention was paid for investigations of these data; sometimes very important results were outside the attention of models' creators.The German "ansatz" is the best word to define modeling of the neutron emission in fission. An ansatz is the establishment of the starting equation(s), the theorem(s), or the value(s) describing a mathematical or physical problem or solution. It can take into consideration boundary conditions. After an ansatz has been established (constituting nothing more than an assumption), the equations are solved for the general function of interest (constituting a confirmation of the assumption).It is not clear at what time the neutrons are emitted; measured neutron widths at thermal energies, extrapolated to high energies [58], give emission times of the order of 10 −16 s, and an upper limit of 4×10 −14 s has been found from angular correlation measurements. However, the neutron emission times may be considerably shorter; the lower limit must be of the order of 10 −22 s, the time required for a

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“…Hauser-Feshbach models [7,12,16,50,57] (HFM) including the spin dependence of neutron emission in competition to gamma-ray and charged particle release.…”

Section: ( )mentioning

confidence: 99%