Use of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si65.gif" overflow="scroll"><mml:mmultiscripts><mml:mrow><mml:mi>Li</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">T</mml:mi></mml:mrow><mml:none /><mml:none /><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:mmultiscripts></mml:math> nuclear reaction for diagnostics of energetic particles in burning plasmas

Nakamura, Makoto; Nakao, Yasuyuki; Voronchev, V.T.

doi:10.1016/j.nima.2007.06.088

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…Such particles increase the population of high energy tails of the respective distributions, so that deviation from the Maxwellian form appears. Nakamura et al [20]- [22] have recently shown that although the non-Maxwellian distortions are generally small, they can lead to appreciable changes of some reaction rates at least in laboratory fusion plasmas.…”

Section: Jcap05(2008)010mentioning

confidence: 99%

Non-thermal processes in standard big bang nucleosynthesis: I. In-flight nuclear reactions induced by energetic protons

Voronchev

Nakao

Nakamura

2008

J. Cosmol. Astropart. Phys.

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The standard model of big bang nucleosynthesis (BBN) relies on a nuclear reaction network operating with thermal reactivities for Maxwellian plasma. In the primordial plasma, however, a number of non-thermal processes triggered by energetic particles of various origins can take place. In the present work we examine in-flight nuclear reactions induced in the plasma by MeV protons generated in D(d, p)T and 3He(d, p)4He fusions. We particularly focus on several low threshold endoergic processes. These are reactions omitted in the standard network—proton-induced break-ups of loosely bound D, 7Li, 7Be nuclei—and the 3H(p, n)3He charge-exchange reaction important for the interconversion of A = 3 nuclei in the early universe. It is found that the break-up processes in the plasma take the form of Maxwellian processes at temperatures T>70 keV, while in the lower temperature range they proceed as non-thermal reactions. It is shown that at T<70 keV the in-flight reaction channels can enhance the break-up reactivities by several orders of magnitude. The levels of these reactivities however remain insufficiently high to affect BBN kinetics and change the standard prediction of light element abundances. The abundances are found to be: Yp = 0.2457, D/H = 2.542 × 10−5, 3He/H = 1.004 × 10−5, 7Li/H = 4.444 × 10−10. Future steps in the study of non-thermal processes in the primordial plasma are briefly discussed.

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Section: Jcap05(2008)010mentioning

confidence: 99%

Non-thermal processes in standard big bang nucleosynthesis: I. In-flight nuclear reactions induced by energetic protons

Voronchev

Nakao

Nakamura

2008

J. Cosmol. Astropart. Phys.

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“…Over the past decades, the nuclear diagnostic scheme has been proposed [18,19] to diagnose the state of HED plasma, which is applied to diagnose the temperature of fusion fuel in inertial confinement fusion (ICF) [20][21][22] and the beamtarget reaction in Z-pinch [23] experiments, the magnetization degree of ions in magneto-ICF [24,25] experiments and ion beam parameters in laser-driven ion acceleration experiments. Based on this, several researchers have explored the numerical solution of the product spectrum in different plasma states [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

A nuclear-reaction-based method for probing the nonthermal ion energy spectrum in high energy density laboratory plasmas

Li,

Liu,

Liu

et al. 2023

Nucl. Fusion

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The nuclear reactions in a plasma system with particle distributions deviated from the Maxwellian are proved to have some unique characteristics, in particular, in their reaction product energy spectra. Based on this, a new nuclear-reaction-based method for probing the nonthermal ion energy spectrum in high-energy-density (HED) laboratory plasmas is proposed, where the energy spectrum of the nonthermal ion high-energy tails can be accurately evaluated through analysis from the spread and peak of the product energy spectrum. The principle of this diagnostic method is theoretically derived and verified by two-dimensional particle-in-cell simulations that self-consistently includes the nuclear reaction calculations. As an example, our simulations demonstrate clearly how this method is applied for probing the nonthermal high-energy protons produced in the HED magnetic reconnection experiment, where a small ratio of boron element is dopped in the laser-ablated hydrocarbon target and the proton-boron (pB) reaction is chosen as the referenced nuclear reaction. The simulations also show that the pB reaction rate is increased by 4 orders of magnitude and the peak of the energy spectrum of the generated alpha particles shift significantly towards the high-energy range due to the nonthermal protons accelerated from reconnections.

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Use of the Li+T6 nuclear reaction for diagnostics of energetic particles in burning plasmas

Cited by 2 publications

References 36 publications

Non-thermal processes in standard big bang nucleosynthesis: I. In-flight nuclear reactions induced by energetic protons

Non-thermal processes in standard big bang nucleosynthesis: I. In-flight nuclear reactions induced by energetic protons

A nuclear-reaction-based method for probing the nonthermal ion energy spectrum in high energy density laboratory plasmas

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