Plasma Energy Deposition from Nuclear Elastic Scattering

Devaney, Joseph J.; Stein, M. L.

doi:10.13182/nse71-a22370

Cited by 56 publications

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“…In turn, the energy loss via NES off am bient nuclei i is given by the expression 4-7Tmami I"' , ,2 / -fj. )dn (7) (ma + m, Y Jb follow ing from a form ula [17] in w hich the effect o f plasm a therm al m otion is allow ed for w ithin a first-order correc tion [18]. In Eq.…”

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confidence: 99%

Nonthermal nuclear reactions induced by fastαparticles in the solar core

Voronchev

2015

Phys. Rev. C

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Nonthermal nuclear effects triggered in the solar carbon-nitrogen-oxygen (CNO) cycle by fast a particlesproducts of the pp chain reactions-are examined. The main attention is paid to 8.674-MeV a particles generated in the 7Li(p ,a )a reaction. Nonthermal characteristics o f these a particles and their influence on some nuclear processes are determined. It is found that the a-particle effective temperature is at a level of 1.1 MeV and exceeds the solar core temperature by 3 orders of magnitude. These fast particles are able to significantly enhance some endoergic (a ,p ) reactions neglected in standard solar model calculations. In particular, they can substantially affect the balance o f the p + n O a + l4N reactions due to an appreciable increase of the reverse reaction rate. It is shown that in the region R = 0.08-0.25 Ra the reverse a + 14N reaction can block the forward p + l70 reaction, thus preventing closing o f the CNO-II cycle, and increase the 170 abundance by a factor o f 2-155 depending on R. This indicates that the fast a particles produced in the pp cycle can distort running o f the CNO cycle, making it essentially different in the inner and outer core regions.

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Nonthermal nuclear reactions induced by fastαparticles in the solar core

Voronchev

2015

Phys. Rev. C

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“…The s t r u m 6f t h e equation (1) such a plasma at an electron temperature of 50 kev. The t r i t o n at 5 Mev has about a 37% probability of reacting in f l i g h t with a thermal deuteron .…”

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confidence: 99%

Transfer cross section matrix for elastic nuclear scattering of low Z ions in deuterium

Corman¹

1974

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“…In nuclear burning plasmas, high-energy particles generated from nuclear reactions or beam injections cause nuclear elastic scattering (NES) with a certain probability [1,2]. NES is predominated by nuclear force, except the pure Coulomb force.…”

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confidence: 99%

A Method of Knock-on Tail Observation Accounting Temperature Fluctuation Using <sup>6</sup>Li+T/D+T Reaction in Deuterium Plasma

Kawamoto

Matsuura

2017

Plasma and Fusion Research

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It is important to understand the phenomena occurring in nuclear burning plasmas in order to operate fusion reactors. Although multiple studies have been conducted on nuclear elastic scattering (NES), only few experiments have focused on the observation of a knock-on tail via NES in nuclear burning plasmas. NES is an important phenomenon because it occurs in various plasmas and affects their energy balance. As for the observation of a knock-on tail, a method using γ-rays/neutrons generated fromHe + n reactions in a proton-beam-injected deuterium plasma has been proposed. However, there is a possibility to be unable to distinguish whether the main factor affecting the reaction rates is the plasma temperature or the formation of a knock-on tail. To avoid this confusion, herein, we proposed a method based on 6 Li + t → 8 Li * + p or D + t → 4 He + n reactions. These reactions can reveal the plasma temperature without the influence of a knock-on tail because the triton distribution function in deuterium plasmas is remarkably distorted from Maxwellian. The procedure and utilization possibility of the proposed method are discussed.

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Plasma Energy Deposition from Nuclear Elastic Scattering

Cited by 56 publications

References 0 publications

Nonthermal nuclear reactions induced by fastαparticles in the solar core

Nonthermal nuclear reactions induced by fastαparticles in the solar core

Transfer cross section matrix for elastic nuclear scattering of low Z ions in deuterium

A Method of Knock-on Tail Observation Accounting Temperature Fluctuation Using <sup>6</sup>Li+T/D+T Reaction in Deuterium Plasma

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