Nuclear Data Section
International Atomic Energy Agency
P.O.Box 100, A-1400 Vienna, Austria

Memo CP-D/421

Date:
To:
From:

9 March 2005
Distribution
O. Schwerer

Subject:

Separate Covariance Files in EXFOR

As discussed at the last NRDC meeting (see Action A24), I submit a proposal on the storageof covariance information for EXFOR data in ENDF-6 File 33 format. The idea is that, incases where the authors present their covariance information in the internationally agreed
File 33 format, it is not meaningful to convert the data into another, not so well known
format.
The general format of separately stored covariance data is described in the EXFOR Formats
Manual, Appendix B. (This is not a strictly defined data format but gives the possibility todefine the actual format of the table in the comment records.)
The purpose of the present proposal is to extend the "Appendix B" option by including File
33 formatted data with proper cross-reference to the related EXFOR subentry, while
keeping the existing option of a user-defined table format.
For the File 33 option, I think it is meaningful to allow also the inclusion of the actual crosssection data in File 3 format, for easy processing. Please give your feedback also on thisoption (or should it even be obligatory?)
Appended is my draft of a revised "Appendix B", including examples of both the freeformat (taken from LEXFOR) and a new example for File 3+33 formatted data.

Distribution:
oblozinsky@bnl.gov
vml@bnl.gov
drochman@bnl.gov
nordborg@nea.fr
manokhin@ippe.obninsk.ru
samaev@obninsk.ru
Mmarina@ippe.obninsk.ru
blokhin@ippe.obninsk.ru
feliks@polyn.kiae.su
chukreev@polyn.kiae.suS.Dunaeva@iaea.org
taova@expd.vniief.ru

varlamov@depni.sinp.msu.ru
chiba@earth.sgu.ac.jp
kato@nucl.sci.hokudai.ac.jp
ohnishi@nucl.sci.hokudai.ac.jp
oba@nrdf.meme.hokudai.ac.jp
yxzhuang@iris.ciae.ac.cn
gezg@iris.ciae.ac.cn
hongwei@iris.ciae.ac.cn
tarkanyi@atomki.hu
stakacs@atomki.hu
katakura@ndc.tokai.jaeri.go.jp
hasegawa@ndc.tokai.jaeri.go.jp

vlasov@kinr.kiev.ua
kaltchenko@kinr.kiev.ua
ogritzay@kinr.kiev.ua
jhchang@kaeri.re.kr
ohtsuka@nucl.sci.hokudai.ac.jp
m.wirtz@iaea.org
schwerer@iaeand.iaea.org
v.zerkin@iaea.org
henriksson@nea.fr
exfor@nea.fr

(Revised Appendix B of EXFOR Formats Manual)

COVARIANCE DATA FILE FORMATCovariance data may be stored on a separate covariance file. This is mandatory ifa) the file is too big to be included conveniently as free text within the EXFOR entry (underthe keyword COVARIANCE); and/orb) the file is in a format which does not fit within columns 12 - 66 available for free text (e.g.
ENDF-6 File 33 format).
The covariance file is namedaaaaasss.cov
with aaaaa being the accesssion number, sss the subentry number of the corresponding
subentry (e.g. 35001002.cov).
There are three record types in the covariance file:• comment records,• data records,• end records.
The actual covariance data can be given either in a free format, defined in the comment records,
or in ENDF-6 File 33 format. In the latter case, the cross section may be included also (in File 3format) for easy processing.
Comment record format
Column1
2–91011 - 80C
Data set number (subaccession number)(blank)Comment which includes covariance type and format

Data record formata) Free format:
Column12 -91011 - 80

D
Data set number (subaccession number)(blank)Data in format given on comment recordb) ENDF 6 File 3/33 format:
First record:
Column12 -91011 - 14
15
16 - 25
26 - 80
Following records:
Column1 - 80F
Data set number (subaccession number)(blank)
MAT number used(blank)
File numbers given, separated by commas (e.g. 3,33)
CommentAs in ENDF-6

End record format
Column

12 -9
10 - 80

E
Data set number (subaccession number)(blank)See also LEXFOR, Covariance.

Example 1: Covariance data in free format as defined in comment records
C10034002
C10034002
C10034002
D10034002
D10034002
D10034002
D10034002
D10034002
D10034002
E10034002

Values given only for elements below diagonal of symmetricmatrix on same energy grid as data format.
FORMAT(9E5.2)
1.0
0.98 1.0
0.90 0.97 1.0
0.70 0.82 0.93 1.0
0.54 0.68 0.83 0.96 1.0
0.64 0.75 0.85 0.92 0.95 1.0

Example 2: Cross section and Covariance data in ENDF-6 File 3/33 format
C35001002 Covariance file for subentry 35001002
C35001002 The file is in ENDF File 33 format, also cross section as File 3
F35001002 6210 3,33
Cross section and covariances in ENDF-6 format
0.000000+0 0.000000+000006210 0 06.215100+4 1.496234+200006210 3102
8.256831+6 8.256831+6001316210 3102
3126210 3102
0.110000+4 0.244474+2 0.135000+4 0.236065+2 0.162500+4 0.218757+26210 3102
0.187500+4 0.196988+2 0.225000+4 0.153861+2 0.275000+4 0.153043+26210 3102
0.350000+4 0.127367+2 0.450000+4 0.100073+2 0.625000+4 0.865960+16210 3102
0.875000+4 0.656557+1 0.112500+5 0.501474+1 0.137500+5 0.457034+16210 3102
0.175000+5 0.387133+1 0.225000+5 0.394818+1 0.275000+5 0.314252+16210 3102
0.350000+5 0.258191+1 0.450000+5 0.232481+1 0.550000+5 0.184880+16210 3102
0.700000+5 0.157094+1 0.900000+5 0.117749+1 0.110000+6 0.997426+06210 3102
0.135000+6 0.992993+0 0.162500+6 0.757935+0 0.187500+6 0.734009+06210 3102
0.225000+6 0.678500+0 0.275000+6 0.492988+0 0.350000+6 0.418481+06210 3102
0.450000+6 0.372564+0 0.550000+6 0.284066+0 0.700000+6 0.247658+06210 3102
0.900000+6 0.194466+0 0.000000+0 0.000000+0 0.000000+0 0.000000+06210 3102
0.000000+0 0.000000+000006210 0 06.215100+4 1.496234+20000621033102
0.000000+0 0.000000+00100621033102
0.000000+0 0.000000+01552832621033102
0.100000+4 0.120000+4 0.150000+4 0.175000+4 0.200000+4 0.250000+4621033102
0.300000+4 0.400000+4 0.500000+4 0.750000+4 0.100000+5 0.125000+5621033102
0.150000+5 0.200000+5 0.250000+5 0.300000+5 0.400000+5 0.500000+5621033102
0.600000+5 0.800000+5 0.100000+6 0.120000+6 0.150000+6 0.175000+6621033102
0.200000+6 0.250000+6 0.300000+6 0.400000+6 0.500000+6 0.600000+6621033102
0.800000+6 0.100000+7 0.000000+0 0.000000+0 0.000000+0 0.000000+0621033102……………..
………………
0.300769-2 0.190133-2 0.194659-2 0.199179-2 0.196701-2 0.199724-2621033102
0.208640-2 0.362495-2 0.197938-2 0.202161-2 0.201359-2 0.205954-2621033102
0.216937-2 0.302796-2 0.208438-2 0.207471-2 0.212723-2 0.225324-2621033102
0.345695-2 0.212488-2 0.218017-2 0.231748-2 0.376135-2 0.218460-2621033102
0.232702-2 0.326855-2 0.242255-2 0.444583-2
0.000000+0 0.000000+000006210 0 0E 35001002

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