I read a paper about neutronics simulation calculation, and the source(neutron source) in that simulation is “a neutron beam with isolethargic energy spectrum”.
So, what is “isolethargic energy spectrum”? How can I define such a spectrum in geant4?
As to defining one in Geant4, as it is merely a way of presenting a spectrum there is no one ‘type’ of spectrum, any spectrum can be converted to an isolethargic energy spectrum. Hope this helps.
Thank you, Katherine Krawec.
I appreciate your explanation and I once think in the same way as you. However, the reason why I asked this question is that I read a paper and the author defines isolethargic energy spectrum(as shown in the picture):
I also found its source is in another paper(New Standard Evaluated Neutron Cross Section Libraries for the GEANT4 Code and First Verification):
So, as you can see, the author intepreted the isolethegic energy distribution as “constant in logarithmic bins”. I’m wondering which quantity is constant and I have not found any clues to this question.
Can anyone help me ?
Thank you and best regards,
jcren.