Theoretical estimates of cross sections for neutron–nucleus collisions
TL;DR: In this paper, an analytical model derived from nuclear reaction theory and having a simple functional form to demonstrate the quantitative agreement with the measured cross sections for neutron induced reactions is presented, for energies ranging from 5 to 700 MeV.
About: This article is published in Annals of Nuclear Energy.The article was published on 2011-07-01 and is currently open access. It has received 6 citations till now. The article focuses on the topics: Nuclear cross section & Neutron cross section.
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01 Jan 1966
TL;DR: In this paper, three continuous families of broad maxima and minima are observed in neutron total cross sections between 0.1 and 100 Mev, and the relationships among the families, their energy-mass number dependence, and their detailed locations can be understood in terms of a semiclassical treatment of a simplified optical model.
Abstract: Three continuous families of broad maxima and minima are observed in neutron total cross sections between 0.1 and 100 Mev. All shift smoothly to higher energy with increasing mass number. The relationships among the families, their energy-mass number dependence, and their detailed locations can be understood in terms of a semiclassical treatment of a simplified optical model. The oscillations are seen to result from interference between the part of the neutron wave which has traversed the nucleus with the part which has gone around. This nuclear situation is analogous to the Ramsauer effect in electron interactions with noble gases. An alternative explanation of the broad maxima as due to resonances of single partial waves is not valid because in general several partial waves are simultaneously important and because the partial wave characteristics change rapidly as one traverses a continuous family of maxima. The widths of the broad maxima are related more to the parameters of the real potential well than to the depth of the imaginary potentia1 well. (auth)
39 citations
32 citations
TL;DR: Spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented in this article for all nuclei with mass number A=239 in a relatively small amount of new data has been reported since the previous evaluation in 2003.
31 citations
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01 Jan 2019
TL;DR: In this article, the authors propose a method to solve the problem of unstructured data mining, which is called data augmentation.xviii,v.viii.
Abstract: xviii
15 citations
Cites background from "Theoretical estimates of cross sect..."
...In the last few decades, a smattering of isotope-chain neutron total cross section analyses have been carried out [38, 32, 39]....
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TL;DR: In this paper , the effects of the simultaneous use of the alpha optical model potentials and the level density models on the cross-section calculations for some alpha-particle-induced reactions on natural antimony were investigated by comparing the obtained calculation results with the experimental data taken from the literature.
5 citations
References
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TL;DR: The total cross section and differential cross section for the inelastic scattering of neutrons are considered in this article, where it is assumed that the compound nucleus is sufficiently excited so that the statistical model may be applied.
Abstract: The total cross section and the differential cross section for the inelastic scattering of neutrons are considered. It is assumed that the compound nucleus is sufficiently excited so that the statistical model may be applied. If the statistical model may be applied as well to the residual nucleus, it is shown that the angular distribution of the inelastically scattered neutrons is isotropic. If only a few levels of the target nucleus can be excited, the angular distribution is anisotropic. Tables are provided which permit the calculation of the angular distribution if the incident and emergent neutron angular momenta are less than or equal to $3\ensuremath{\hbar}$. Examples of the evaluation of total cross sections are given, providing examples of the sensitivity of the results to the quantum numbers of the excited state.
1,609 citations
"Theoretical estimates of cross sect..." refers methods in this paper
...These can also be used for performing Hauser-Feshbach (Hauser and Feshbach 1952) calculations with Monte-Carlo simulations (Pace2 code 1984) to estimate the cross sections for neutron induced fission, evaporation residues or evaporation neutron multiplicities and for comparison of the photon…...
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...These can also be used for performing Hauser-Feshbach (Hauser and Feshbach 1952) calculations with Monte-Carlo simulations (Pace2 code 1984) to estimate the cross sections for neutron induced fission, evaporation residues or evaporation neutron multiplicities and for comparison of the photon (Mukhopadhyay and Basu 2007; Mukhopadhyay and Basu 2009) versus neutron induced fission as well and may serve as inputs to intranuclear cascade codes such as MCNPX package....
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TL;DR: In this article, the authors presented new phenomenological optical model potentials for neutrons and protons with incident energies from 1 keV up to 200 MeV, for (near-)spherical nuclides in the mass range 24⩽ A ⩽209 They are based on a smooth, unique functional form for the energy dependence of the potential depths, and on physically constrained geometry parameters.
1,373 citations
"Theoretical estimates of cross sect..." refers background in this paper
...In a recent study, Koning and Delaroche (Koning and Delaroche 2003) gave a detailed specification....
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999 citations
29 Sep 1995
TL;DR: In this article, a compact reliable and modular Cyclotron has been designed, which operates indefinitely in a closed cycle, namely the discharge of a fuel load, with the exception of fission fragments, is re-injected in the sub-critical unit with the addition of natural Thorium to compensate for the burnt fuel.
Abstract: "The EA operates indefinitely in a closed cycle, namely the discharge of a fuel load, with the exception of fission fragments, is re-injected in the sub-critical unit with the addition of natural Thorium to compensate for the burnt fuel. After many cycles an equilibrium is reached, in which the Actinide concentrations are the balance between burning and C incineration E. The fuel is used much more efficiently, namely the power obtained from 780 kg of Thorium is roughly the same as the one from 200 tons of native Uranium and a PWR (33 GW.day/t of burn-up). The probablility of a criticality accident is suppressed since the device operates at all times far away from it. Spontaneous convective cooling by the surrounding air makes a C melt-down E leak impossible. An EA module consists of a 1500 MWth unit with dedicated 1.0 GeV proton accelerator of 12.5 mA. A compact reliable and modular Cyclotron has been designed. A plant may be made of several such modules. For instance a cluster of three such modular units will produce about 2,000 MWe of primary electrical power. A relevant feature of our design is that it is based on natural convection to remove the heat generated inside the core. The EA is a large, passive device in which a proton beam is dumped and the heat generated by nuclear cascades is extracted without other major elements of variability. The delivered power is controlled exclusively by the current of the accelerator, The fuel needs no access during the whole burn-up and it may be kept sealed up as a non-proliferation safeguard measure. Contrary to Fusion, there are no major technologcal barriers. After = 700 years the radio-toxicity left is about 2000 times smaller than the one of an ordinary Pressurised Water Reactor (PWR) for the same energy. Geological storage (1e+06 years) is virtually eliminated or at least strongly reduced [<= 500 Ci/GWe.y) after 1000 years]. It could be furher reduced (<35 Ci) ""incinerating"" some of the nuclides. Radioactivity dose to individuals truncated to 10,000 years and due to operation is about1/330 of the one of PWR and about 1/33 of Coal burning."
463 citations
TL;DR: The isobaric spin dependence of the real part of the nuclear potential is investigated in this paper, which is expected theoretically from the action of Heisenberg forces and the exchange effects of other forces.
458 citations
"Theoretical estimates of cross sect..." refers background in this paper
...The first term VA = V0 + V1(1 − 2Z/A) + V2/A of the real potential V = VA + VE √ E contains both the isoscalar and the isovector (Lane 1962; Satchler 1983) components of the optical potential (Gould 1986; Anderson and Grimes 1990) where Z is the atomic number of the target nucleus, whereas the second term accounts for its energy dependence....
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...The first term VA = V0 + V1(1 − 2Z/A) + V2/A of the real potential V = VA + VE √ E contains both the isoscalar and the isovector (Lane 1962; Satchler 1983) components of the optical potential (Gould 1986; Anderson and Grimes 1990) where Z is the atomic number of the target nucleus, whereas the…...
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