Find specific reaction cross section in an ENDF file

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SUMMARY

This discussion focuses on locating the specific reaction cross section for the reaction 18O(p,n)18F within the ENDF file format from the TENDL database. The user, Lee, is comparing cross section values from the TENDL output files and the corresponding ENDF file, noting discrepancies in the values provided. The relevant files are accessible via FTP links, and the user seeks clarification on the differences observed between the TENDL data and the ENDF file values.

PREREQUISITES
  • Understanding of nuclear reaction cross sections
  • Familiarity with ENDF file format
  • Knowledge of TENDL (TALYS Evaluated Nuclear Data Library)
  • Basic proficiency in interpreting scientific data tables
NEXT STEPS
  • Investigate the differences in cross section values between TENDL and ENDF files for the reaction 18O(p,n)18F
  • Learn how to extract and interpret data from ENDF files
  • Explore the TENDL documentation for detailed explanations of their data formats
  • Review literature on the significance of Q-values and thresholds in nuclear reactions
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Nuclear physicists, researchers in nuclear data evaluation, and anyone involved in analyzing reaction cross sections in nuclear physics.

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I'm trying to find specific reaction cross section 18O(p,n)18F
in proton + O-18 TENDL (ENDF format).

# p + 18O : (p,n) Total
# Q-value =-2.51902E+00
# E-threshold= 3.64964E+00
# # energies = 45
# E xs
1.000E+00 0.00000E+00
2.000E+00 0.00000E+00
3.000E+00 7.05780E+01
4.000E+00 1.83053E+02
5.000E+00 2.56205E+02
6.000E+00 2.81193E+02
7.000E+00 3.05196E+02
8.000E+00 3.10529E+02
9.000E+00 2.62915E+02
1.000E+01 1.82168E+02

It's provided in the link of 18O(p,n)
ftp://ftp.nrg.eu/pub/www/talys/tendl2013/proton_file/O/018/xs/xs100000.tot
However, I can not find correspond value in ENDF file.
ftp://ftp.nrg.eu/pub/www/talys/tendl2013/proton_file/O/018/lib/endf/O018-p.tendl
https://www.dropbox.com/s/07m9shznsx1jco6/9018.JPG


https://www.dropbox.com/s/07m9shznsx1jco6/9018.JPG
Please advise me.
 
Last edited:
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Please let me rephrase my the question.
I'm looking for the cross section of 18O(p,n)18F in the ENDF file of TENDL provided in the link:
p + 18O : (p,n) ftp://ftp.nrg.eu/pub/www/talys/tendl2013/proton_file/O/018/xs/xs100000.tot
18O(p,x)18F : Production of 18F ftp://ftp.nrg.eu/pub/www/talys/tendl2013/proton_file/O/018/residual/rp009018.tot
Which are the same as expected.

However,the cross section of residual product 9.018000+3 the ENDF file is different as the links above
ftp://ftp.nrg.eu/pub/www/talys/tendl2013/proton_file/O/018/lib/endf/O018-p.tendl
https://www.dropbox.com/s/07m9shznsx1jco6/9018.JPG

I'm very confused about the difference.
Please advise me.
Thanks in advance

Lee

  p+18O : (p,n) 9.018000+3 tendl ENDF
E(MeV) xs  
1 0.00000E+00 0.000000+0
2 0.00000E+00 0.000000+0
3 7.05780E+01 2.122838-1
4 1.83053E+02 3.758248-1
5 2.56205E+02 4.250742-1
6 2.81193E+02 4.218380-1
7 3.05196E+02 4.307818-1
8 3.10529E+02 4.175966-1
9 2.62915E+02 3.399558-1
10 1.82168E+02 2.289246-1
11 1.37536E+02 1.708513-1
12 1.03401E+02 1.282725-1
13 8.15315E+01 1.017085-1
14 6.03028E+01 7.595463-2
15 4.71970E+01 6.012981-2
16 3.71000E+01 4.783334-2
17 3.04388E+01 3.969633-2
18 2.42685E+01 3.202279-2
19 1.91105E+01 2.550941-2
20 1.57749E+01 2.130231-2
 

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