Nuclear Data Section
International Atomic Energy Agency
P.O.Box 100, A-1400 Vienna, Austria
Memo CP-D/542
Date:
To:
From:

15 January 2009
Distribution
O. Schwerer, N. Otsuka,

Subject:

Intensity of prompt and delayed fission gammas

1. Prompt fission gamma spectra integrated over a partial energy range
New entry 14195 (V. V. Verbinski et al., Phys. Rev. C 7 (1973) 1173) compiles
multiplicity of prompt fission gammas obtained by continuous spectra of prompt
fission gammas integrated over a partial range of gamma energy. Because existing
quantity code PR,SPC is for prompt discrete gamma lines, we need a new quantity
code for 14195.
The data are given in the article in units photons/fission (in the table annotation
misspelled as “protons per fission”). These units correspond to EXFOR units
PRT/FIS which has in our dictionary the dimension code FY
Dictionary 236 (Quantities)
PR/PAR,MLT,G Partial multiplicity of prompt gamma(Use PR,SPC for prompt discrete gamma)
Quantity
PR/PAR,MLT,GReaction TypePZ

Dimension
FYSubentry
14195.002-004

2. Intensity of prompt and delayed fission gammas – unit dimensionDictionary 236, the quantity PR,SPC and DL,SPC have still an old dimension code
SPC which is no longer used in the quantity dictionary 25. Therefore, whatever units
are used with quantity PR,SPC or DL,SPC, they will generate an error message.
It is not surprising that these inconsistencies were not yet found, because in the master
file there is not a single EXFOR entry of PR,SPC or DL,SPC using “real” units.
These are all the occurrences:
PR,SPC

20956
20957
20958

NODATA
Relative data with ARB-UNITS
Relative data with ARB-UNITSDL,SPC

2095621592

NODATA
Relative data with ARB-UNITSPR/TER,SPC 30760

NODATA

Note that other quantities with SF6=SPC have dimension YLD, which includes
following units:
PC/INC, PC/REAC, PRD/INC, PRD/REAC, PRT/INC, PRT/REAC
On the other hand, dimension FY corresponds to these units:
PC/FIS, PRD/FIS, PRT/FIS.
So FY units are very similar to YLD units except that REAC is replaced by FIS. It is a
special case for fission, to be similar to units traditionally used in the literature. Sinceboth quantities, PR,SPC and DL,SPC, are restricted to fission reactions, it is logicalto use units of dimension FY.
Dictionary 236 (Quantities)
PR,SPC
Change unit family code from SPC to FY
DL,SPC
Change unit family code from SPC to FY
PR/TER,SPC
Change unit family code from YLD to FY

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