Nuclear Data Section
International Atomic Energy Agency
P.O.Box 100, A-1400 Vienna, Austria
Memo CP-D/589
Date:
To:
From:

30 September 2009
Distribution
N. Otsuka, O. Schwerer, S. Singh

Subject:
Reference:

Fission fragment production cross section and fission yield
Memo CP-D/483

Fission fragment production cross section σ(Z,A) can be related to fission yield
FY(A,Z) as follows:σ(Z,A) = FY (A,Z) * σ f, where σ f is the fission cross section of the reaction. The fission fragment production
cross section is not mentioned in LEXFOR entries “Fission Yields” and “Productionand Emission Cross Sections” except 235U(n,f)133gXe cumulative cross section incoding sample of “Fission Yields”. Recently we have prepared two entries for Indian
data [1,2] A new quantity code CHN,SIG proposed for dictionary 236 in Memo CPD/483 are used in these entries. The following updates are proposed for both entries.
(1) Proposed addition/correction (underline) to LEXFOR “Fission Yields”
1. Absolute Yields. (Fissions and fission fragments are counted independently.)
REACTION coding: The quantity code FY in SF6. The yield type is specified in
SF5 (Branch) (see under specific type of yield, following pages).
Units: a code from Dictionary 25 with the dimension FY (e.g., PC/FIS).
2. Absolute Cross sections (Fission fragment production cross section)
The absolute yield may be also expressed by the fission fragment production crosssection. The relation between the cross section and fission yield is σ(Z,A) =FY(A,Z)•σ f , where σ f is the fission cross section of the reaction.
REACTION coding: The quantity code SIG in SF6. The branch codes (SF5) for
absolute yields may be also used in coding of fission fragment production crosssections.
Units: a code from Dictionary 25 with the dimension B (e.g., B).
3. Relative yields.
…
Examples for product nuclei coded within the reaction code:…
(92-U-235(N,F)MASS,CHN,FY) chain yield of several mass numbers given in
the DATA table under the data heading
MASS.
(92-U-235(N,F)MASS,CHN,SIG) chain cross section of several mass numbers
given in the DATA table under the data
heading MASS.

…
(2) Proposed addition (underline) to LEXFOR “Production and Emission Cross
Sections”

Production and Emission Cross Sections(See Fission Yields for fission fragment production cross sections.)

Definition: The production cross section for a particle …
…

Reference[1] S. S. Rattan et al., J. Radioanal. Nucl. Chem.. 242 (1999) 551 (EXFOR D6006)[2] S. Singh et al., J. Radioanal. Nucl. Chem.. 279 (2009) 547 (EXFOR D6077)

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