| Autor: |
Anderegg, F., Dubin, D. H. E., O'Neil, T. M., Driscoll, C. F. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; Mar2013, Vol. 1521 Issue 1, p257-264, 8p, 1 Diagram, 4 Graphs |
| Abstrakt: |
We present the first detailed experimental measurements of the Salpeter collisional enhancement factor in correlated plasma. This factor is predicted to enhance the nuclear reaction rate in dense correlated plasmas such as in giant planet interiors, brown dwarfs and degenerate stars. Recent non-neutral plasma theory establishes that it also applies to the perpendicular-to-parallel collisions in magnetized plasmas. The enhancement is caused by plasma screening of the repulsive Coulomb potential between charges, allowing closer collisions for a given particle energy. The enhancement factor is large when the plasma correlation factor Γ is larger than unity, scaling as g(Γ) ≃ eΓ. We perform measurements of collision rate in laser-cooled magnesium ion plasmas with density n ∼ 107cm-3 and temperature 2.5 × 10-6 < T < 1 eV, resulting in 0 < Γ < 25. We observe that at high Γ (i.e. low temperature), the collision rate is increased by a factor up to 109 over the uncorrelated theory prediction, consistent with the Salpeter enhancement. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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