Nuclear Data Section
International Atomic Energy Agency
P.O.Box 100, A-1400 Vienna, Austria
Memo CP-D/739
Date:
To:
From:

13 April 2012
Distribution
N. Otsuka

Subject:
Reference:

Review of gamma spectra compiled in EXFOR
Memo CP-E/122

There has been an action to me since the NRDC 2007 Meeting,“Review the various types of gamma spectra in EXFOR, as well as the related
quantities and units”.
Various REACTION codes for gamma spectra allowed in the current rule aresummarized at the end of this memo. I found that discrete gamma spectra given in[gammas/capture], [gammas/incident particle] etc. have been compiled with SF6=SPCor SF5-6=PAR,XX (XX=MLT when G is in SF3 or SF7, and XX=PY when 0-G-0 in SF4).
LEXFOR “Gamma Spectra” explains that the γ-ray energies are discrete and coded
under the heading E when SPC is in SF6. This implies SF6=SPC is not applied whenthe multiplicity is for continuous spectra integrated over a range of radiation energy(e.g., from E-MIN to E-MAX). To verify this assumption, I checked the correlation
between quantity codes and data headings.

EE*MIN*
E*MAX*369
28SF6=SPC
819SF5-6=PAR,XX(E*MIN* can be E-MIN, E-CM-MIN etc.)

Other37
1I propose to use SPC for discrete gamma line(s) as explained in LEXFOR, while use
PAR,MLT or PAR,PY for continues gammas. Many existing data sets can live with thissolution.
One may worry about discrete gamma multiplicities in fission, because fission yields(multiplicities) are coded with SF6 = FY except for fission neutron multiplicities NU.
There are however only 6 entries (9 data sets) coded with heading E + SF6=SPC, andthey are given in [gammas/incident particle] or in arbitrary unit. This means there isno discrete gamma multiplicity given in [gammas/fission] in EXFOR, and hence we
can apply SF6=SPA codes even if they ask a unit code belonging to the unit family
YLD (e.g., [gammas/incident particle]).

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Table: Various discrete and continuous gamma spectra can be compiled in EXFOR(Italicized example is allowed within the rule, but no real data set in the current database)Type of spectra

SF5-SF6Dim.

Example of REACTION code

Example of unit code

discrete or group γ in SF3 or 7

PAR,MLT,SPC
PAR,PY,SPC,SPC
PAR,FY
PR,SPC

YLD
YLD
YLD
YLD
YLD
FY
SPC

(40-ZR-91(N,G)40-ZR-92,PAR,MLT)(40-ZR-91(N,G)40-ZR-92,,SPC)(66-DY-164(N,X)0-G-0,PAR,PY)(66-DY-164(N,X)0-G-0,,SPC)(46-PD-105(N,INL)46-PD-105,,SPC)(92-U-235(N,F)0-G-0,PR/PAR,FY)(92-U-235(N,F),PR,SPC)

PRT/REAC (i.e., gamma/capture)
PRT/REAC (i.e., gamma/capture)
PRT/INC (i.e., gamma/inc. neutron)
PRT/INC (i.e., gamma/inc. neutron)
PRT/INC (i.e., gamma/inc. neutron)
PRD/FIS (i.e., gamma/fission),MLT/DE,PY/DE,FY/DE

1/E
1/E
FYDE

(34-SE-77(N,G)34-SE-78,,MLT/DE)(66-DY-164(N,X)0-G-0,,PY/DE)(92-U-235(N,F)0-G-0,PR,FY/DE)

discrete or group γ in SF4
discrete or group γ not in any SF
discrete or group γ per fission
continuous γ in SF3 or 7
continuous γ in SF4 or 7
continuous γ per fission? (no unit code belonging to thedimension SPC)
PT/RCT/MEV (i.e., gamma/capture/MeV)
PD/RCT/MEV (i.e., gamma/capture/MeV)
PD/FIS/MEV (i.e., gamma/fission/MeV)