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            posm:  positronium continuum

Positronium continuum (Brown  & Leventhal 1987 ApJ 319, 637)

A(E) =

K*[2/((pi^2-9)*E_c)]*

[E*(E_c-E)/(2E_c-E)^2 + 2E_c*(E_c-E)/E^2*log((E_c-E)/E_c) - 2E_c*(E_c-E)^2/(2E_c-E)^3*log((E_c-E)/E_c) + (2E_c-E)/E]

 

for E < Ec = 511 keV, where:

 

norm = K

normalization.