Nuclear Data Section
International Atomic Energy Agency
P.O.Box 100, A-1400 Vienna, Austria
Memo CP-D/643

Date:
To:
From:

4 June 2010
Distribution
N. Otsuka, V. McLane

Subject:

Light-nuclei reactions (Z<6)

For neutron-induced reaction on light nuclei (Z<6), all possible neutron reactions(SF1-SF4) are listed in LEXFOR Light-Nuclei Reactions (Z<6). Below are allpossible SF1-SF4 combinations (SF3 ≠ EL, INL etc.) for Lithium-6.
Li(n,γ) 7Li
6
Li(n,t+α)6Li(n,n+d+α)6Li(n,p) 6He
6
Li(n,2n+p+α)6Li(n,n+t+h)
63-LI-6(N,G)3-LI-7
3-LI-6(N,T)2-HE-4
3-LI-6(N,N+D)2-HE-4
3-LI-6(N,P)2-HE-6
3-LI-6(N,2N+P)2-HE-4
3-LI-6(N,N+T)2-HE-3

However, for those cases where there is an intermediate nucleus that is unstable andbreaks up with the emission of a particle, and data is given that is dependent on thatnucleus, we now allow the inclusion of the intermediate nucleus according to aconclusion of the 2010 NRDC meeting. The purpose of this memo is to clarify when
the nucleus may be coded in SF4.
Example: 10688.002
This subentry gives angular distribution of deuteron in 6Li(n,n+d+α) where n+α isfrom the ground state of 5He. The REACTION is coded as:
REACTION(3-LI-6(N,N+D)2-HE-4,PAR,DA,D), with EN-SEC(E-LVL,2-HE-5)
Under the new rules the coding is simplified to:
REACTION(3-LI-6(N,D)2-HE-5,PAR,DA)
We would propose to modify the last paragraph of this LEXFOR chapter
under Neutron Reactions:
No REACTION codes other than those listed on the following pages should be used inEXFOR for the light-nuclei neutron-induced reactions, except when the branch code
SEQ is given (see under Outgoing Particles). A further exception is made forintermediate nuclei that are unstable and break up with the emission of particle (e.g.
n, p, α). In this case, if the data are given for only that portion of the reaction thatproceeds through the intermediate nucleus, the intermediate nucleus is given as theproduct of the reaction.

Example: 6Li(n,d)5He reaction where 5He immediately decays to a neutron and analpha particle, the reaction is coded, in general, as 3-LI-6(N,N+D)2-HE-4.
However, where the experiment identified existence of 5He (e.g. by outgoing neutronenergy), the reaction should be coded as: 3-LI-6(N,D)2-HE-5.
In addition to the processes listed, only scattering processes as well as sum crosssections, such as absorption, nonelastic, charged-particles emission, etc., are definedfor these nuclei.

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