Hi, I'm reading Lamarsh's book "Introduction to nuclear reactor theory" and in chapter 7 he discusses the influence of temperature on the resonance escape probability. He states that after an increase in Temperature, as a consequence of Doppler broadening, the microscopic absorption cross section of the fuel goes down and so the flux increases. If I interpreted correctly he then states that since we have "more neutrons" (the flux is higher) we have more collision and more absorption near the resonance. I don't understand this. The flux is higher, this I understand, but the cross section is smaller! So I though the effects should cancel... Why does the increased flux seem to play a bigger role than the lower value of the microscopic cross section?