Electron capture rates in a plasma
  A new general expression is derived for nuclear electron capture rates within dense plasmas. Its qualitative nature leads us to question some widely accepted assumptions about how to calculate the effects of the plasma on the rates. A perturbative evaluation, though not directly applicable to the strongly interacting case, appears to bear out these suspicions. 
R. F. Sawyer
astro-ph.SR nucl-th physics.plasm-ph