The cross section for 12C(n,n’)3alpha reaction at 14 MeV is about 0.3
barn. The attached cross section graph is from Chadwick et
al.,"Evaluated Cross-Section Libraries and Kerma Factors for Neutrons
Up to 100 MeV on 12C", US DOE, Lawrence Livermore National
Laboratory, Document UCRL-ID-120829, April 11, 1995, p. 74. It can
be found on the web.
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Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/