RUSSIA NUCLEAR DATA CENTER - RNDC
Alias: CENTR JADERNYKH DANNYKH - CJD
Institute of Physics and Power Engineering - IPPE
Bondarenko Sq., 1,Obninsk 249033
Kaluga Region, RUSSIA
Telephone:+7 (48439)98986 (A.Blokhin)+7 (48439)98779 (M.Mikhaylyukova)

Fax:+7 (48439)68225

Internet:

www.ippe.ru/podr/cjd

MEMO CP-4/180
DATE:
TO:
From:
Subject:

26 February 2010
Distribution
M.Mikhaylyukova, A.Blokhin, V.Pronyaev
Statistics for Subents with NODATA

For discussion of 9.2 Agenda at NRDC2010.
At present time EXFOR data base contains a lot of Subents without data (NODATA).
According to the Action 48 of NRDC2009 meeting NDS prepared the full list of these
Subents: http://www-nds.iaea.org/nrdc/nodata
At this web-page Subents (NODATA) were split into two groups:- Subents superseded by other Subents – they have STATUS (SPSDD,#);- Subents not superseded.
For first group of Subents (SPSDD,#) - EXFOR user has possibility to find data in other
Subents #, therefore data are presented in EXFOR.
For second group of Subents (not superseded) data are really absent in EXFOR.
Total number of such Subents– 1891 and it’s growing from year to year.
There are several reasons to minimize the number of Subents with NODATA and not SPSDD:- For evaluators and other users it would be better to have no one such Subent in EXFOR.
- Old publications are not always available now. Some issues of journals are lost in libraries.
And if we will not start to digitize systematically data from old articles (at least those are inEXFOR already with NODATA) we could lost these experimental data.
- EXFOR is data base, so data should be found and inserted in EXFOR.
To analyze situation by years the statistics was prepared for Entries before and after 2000
year (year is year of first reference in Entry).
Prepared statistics is given in Table .
In last column the ratio of number of Entries after year 2000 to total number of Entries is given.
At average this ratio is about 9.5 %. So, it could be concluded, that situation with such Entries
without data has been improved during the last 10 years, if one takes in mind, that other 90.5 % arefor previous period of about 50 years (from ~1950 to 2000 year).

Table. Number of Entries containing Subents with NODATA and not superseded-before and after 2000 year.
CenterTotalEntries
Entries(>=2000)/totalcharacter< 2000 year>= 2000 year
%
1202
197
52.5
2131
117
1410.7
3
18
1804
61
58
34.9
A
110C
83
81
22.4
D
15
3
1173.3E29
191065.5
K
1
10
L
1
10
M
2
1150.
O
1
10
P
10
100
R
550
T
18
180
V
1
10
Summary579
522
55
Average - 9.5(=55/579)
PROPOSALS for Entries with NODATA and not superseded:
1) When authors’ tables are available in old EXFOR backup or in References - Restore the numerical data.
2) When there is real duplication as in REFERENCE as in DATA - Delete this Subent by NOSUBENT and add comment in HISTORY.
3) When SPSDD is applicable.
- Add SPSDD under STATUS.
4) When SPSDD is not applicable and the last article was published in 2000 or before - Digitize numerical data if quality of the figures is enough for digitization.
- If digitization is not possible - add UNOBT and comment.
5) When SPSDD is not applicable and the last article was published after 2000 - Ask authors numerical data again, write the date of this request and also author's name inHISTORY.
In the future, if the e-mail list of authors will be produced (proposed in Memo CP-4/178), thenregular automatic sending of e-mails to authors could be organized probably once in half of year.

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emmeric.dupont@oecd.org,
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