Prompt fission neutron spectra in exfor
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Prompt Fission Neutron Spectra in EXFOR. N. Otsuka IAEA Nuclear Data Section. International Network of Nuclear Reaction Data Centres (NRDC). NNDC NEA-DB IAEA-NDS CJD, CAJaD, CDFE, CNPD ATOMKI CNDC JCPRG, JAEA KAERI UkrNDC BARC.

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Prompt Fission Neutron Spectra in EXFOR

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Prompt fission neutron spectra in exfor

Prompt Fission Neutron Spectra in EXFOR

N. Otsuka

IAEA Nuclear Data Section

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


International network of nuclear reaction data centres nrdc

International Network ofNuclear Reaction Data Centres (NRDC)

NNDC

NEA-DB

IAEA-NDS

CJD, CAJaD, CDFE, CNPD

ATOMKI

CNDC

JCPRG, JAEA

KAERI

UkrNDC

BARC

4 neutron centres (NNDC, NEA-DB, NDS, CJD) are responsible

to compilation of PFNS data measured in their (geographic) areas.

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


Statistics of exfor pfns

Statistics of EXFOR PFNS

Total = 145 subentries (52 for 252Cf(s.f.))

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


Various expressions of pfns

Various Expressions of PFNS

  • Absolute PFNS (neutrons/MeV/fission)

  • χ(E)

  • (2) PFNS relative to the 252Cf spontaneous PFNS (no dimension)

  • χ(E) / χ252(E)

  • (3) PFNS relative to Maxwell distribution (no dimension)

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


Various expressions of pfns cont d

Various Expressions of PFNS (cont’d)

(4) “Normalized” PFNS (1/MeV/fission)

X(E)

(5) “Normalized” PFNS relative to the “normalized” 252Cf

spontaneous PFNS (no dimension)

X(E) / X252(E)

(6) PFNS relative to √E

Absolute data, shape data, absolute ratio, shape ratio …

The current EXFOR system is not ready for this variety…

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


Inconsistency of pfns in exfor

Inconsistency of PFNS in EXFOR

REACTION: With or without PR (prompt)

(98-CF-252(0,F),PR,DE,N)

(98-CF-252(0,F),,DE,N)

REACTION: Variety in PFNS relative to Maxwell spectrum

(98-CF-252(0,F),PR,DE,N,MXD)

(98-CF-252(0,F),PR,DE,N,REL)

((98-CF-252(0,F),PR,DE,N,,EXP)/(98-CF252(0,F),PR,DE,N,,CALC))

((98-CF-252(0,F),PR,DE,N)/(98-CF-252(0,F),PR,DE,N))

REACTON: Strange quantity code defined in the EXFOR system

PR,DE,N,RTE - Energy spectrum of prompt fission neutron * square root(E)) !?

Variety in unit

1/MEV (should not be used for any type of PFNS)

PT/FIS/MEV(should be used for absolute PFNS)

NO-DIM(should be used for absolute PFNS ratio)

ARB-UNITS(should be used for shape data)

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


Decision of pfns unit by exfor compilers

Decision of PFNS Unit by EXFOR compilers

Relative data (arbitrary unit)?

Absolute data (neutrons per MeV per fission)?

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


Summary

Summary

  • Inconsistency in EXFOR (REACTION code, unit)

  • Can’t translate to C4 format, Can’t plot on web.

  • Several versions of data exist in the database

  • (e.g. Starostov et al. NIIAR)

  • → See details in Pronyaev’s note (Nov. 2008)

  • Additional data from digitization → Ask NDS

  • (PFNS relative to Maxwell spectrum in figure)

  • EXFOR PFNS needs clean-up !

  • Your feedbacks will be much appreciated !

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


Prompt fission neutron spectra in exfor

END

N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)


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