What Code Can Predict Neutron and Gamma Yields from an AmBe Source?

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terryphi
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Hello,

does anyone know of a code that will generate the expected neutron spectrum for an AmBe neutron source along with the expected reaction efficiency?
 

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Here is a paper that references a calculation, but the referenced citation is not so clear. Perhaps they refer to using a calibrated curve.

http://nvl.nist.gov/pub/nistpubs/jres/111/6/V111.N06.A02.pdf (cites Ref. 12)

Ref 12: www-pub.iaea.org/MTCD/publications/PDF/TRS403_scr.pdf


What does one mean by radiation efficiency?
 
For every currie of Am I have, how many neutrons will be produced? how many gammas will be produced?