ENDF reaction MT's and macroscopic reaction numbers

Serpent uses standard ENDF reaction MT's to identify neutron and photon reactions. The number are used with detector response functions and printed in various output files. Detector responses also include macroscopic cross sections, identified by negative reaction numbers. Below are descriptive lists of ENDF reaction MT's and macroscopic reaction numbers. For more information on the MT numbers, see the ENDF Format Manual.

ENDF Reaction MT's

MT	Description
1	total
4	total inelastic scattering
2	elastic scattering
3	nonelastic
11	(n,2nd)
16	(n,2n)
17	(n,3n)
18	total fission
19	(n,f)
20	(n,nf)
21	(n,2nf)
22	(n,nα)
23	(n,n3α)
24	(n,2nα)
25	(n,3nα)
27	absorption
28	(n,np)
29	(n,n2α)
30	(n,2n2α)
32	(n,nd)
33	(n,nt)
34	(n,n3He)
35	(n,nd2α)
36	(n,nt2α)
37	(n,4n)
38	(n,3nf)
41	(n,2np)
42	(n,3np)
44	(n,n2p)
45	(n,npα)
51 - 90	inelastic scattering to excited states
91	inelastic scattering to continuum
101	total absorption
102	(n,γ)
103	(n,p)
104	(n,d)
105	(n,t)
106	(n,3He)
107	(n,α)
108	(n,2α)
109	(n,3α)
111	(n,2p)
112	(n,pα)
113	(n,t2α)
114	(n,d2α)
115	(n,pd)
116	(n,pt)
117	(n,dα)
201	total neutron production
202	total photon production
203	total proton production
204	total deuteron production
205	total triton production
206	total 3He production
207	total α production
301	total heat production
443	kinematic KERMA
444	damage-energy production
600	(n,p) to ground state
601 - 648	(n,p) to excited states
649	(n,p) to continuum
650	(n,d) to ground state
651 - 698	(n,d) to excited states
699	(n,d) to continuum
700	(n,p) to ground state
701 - 748	(n,t) to excited states
749	(n,t) to continuum
750	(n,3He) to ground state
751 - 798	(n,3He) to excited states
799	(n,3He) to continuum
800	(n,α) to ground state
801 - 848	(n,α) to excited states
849	(n,α) to continuum
875	(n,2n) to ground state
876 - 890	(n,2n) to excited states
891	(n,2n) to continuum