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Number of results

Journal

2009 | 7 | 3 | 527-533

Article title

Anomalous enhancements of low-energy fusion rates in plasmas: the role of ion momentum distributions and inhomogeneous screening

Content

Title variants

Languages of publication

EN

Abstracts

EN
Non-resonant fusion cross-sections significantly higher than corresponding theoretical predictions are observed in low-energy experiments with deuterated matrix target. Models based on thermal effects, electron screening, or quantum-effect dispersion relations have been proposed to explain these anomalous results: none of them appears to satisfactory reproduce the experiments. Velocity distributions are fundamental for the reaction rates and deviations from the Maxwellian limit could play a central role in explaining the enhancement. We examine two effects: an increase of the tail of the target Deuteron momentum distribution due to the Galitskii-Yakimets quantum uncertainty effect, which broadens the energy-momentum relation; and spatial fluctuations of the Debye-Hückel radius leading to an effective increase of electron screening. Either effect leads to larger reaction rates especially large at energies below a few keV, reducing the discrepancy between observations and theoretical expectations.

Publisher

Journal

Year

Volume

7

Issue

3

Pages

527-533

Physical description

Dates

published
1 - 9 - 2009
online
25 - 6 - 2009

Contributors

  • Ist. Naz. Fisica Nucleare (I.N.F.N.) Cagliari, Cittadella universitaria, I-09042, Monserrato, Italy
author

References

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_s11534-009-0068-y
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