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SUMMARY:Measurement of Correlation-Enhanced Collision Rates
DTSTART:20120920T140000
DTEND:20120920T150000
DTSTAMP:20260405T152610Z
UID:3924bcc5d81ad677da2adc4f46ea1fd6de55b88ec3ae91478d991f63
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. F. Anderegg\, UCSD Physics Department\, 9500 Gilman Drive
 \, La Jolla CA  USA\nThis talk presents the first detailed experimental m
 easurements of the Salpeter collisional enhancement factor in correlated p
 lasma. This factor is predicted to enhance the nuclear reaction rate in de
 nse correlated plasmas such as in giant planet interiors\, brown dwarfs an
 d degenerate stars. Recent non-neutral plasma theory establishes that it a
 lso applies to the perpendicular-to-parallel collisions in magnetized plas
 mas. The enhancement is caused by plasma screening of the repulsive Coulom
 b potential between charges allowing closer collisions for a given particl
 e energy. The enhancement factor is large when the plasma correlation fact
 or G = e^2/aT is larger than unity\, scaling as g(G) ~ e^G. We performed m
 easurement of collision rate in laser cooled magnesium ion plasma with den
 sity n~10^7cm^-3 and temperature 2.5x10^-6 < T < 1 eV\, resulting in 0 < G
  < 25. We observe that at high G (i.e. low temperature)\, the collision ra
 te is increased by a factor g~10^9 over the uncorrelated theory prediction
 \, consistent with the Salpeter enhancement.\nWork supported by National S
 cience Foundation grant PHY-0903877 and Department of Energy grant DE-SC00
 02451.
LOCATION:PPB 019
STATUS:CONFIRMED
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