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Prompt Fission Neutron Spectra in EXFOR

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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  1. Prompt Fission Neutron Spectra in EXFOR N. Otsuka IAEA Nuclear Data Section N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)

  2. 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)

  3. Statistics of EXFOR PFNS Total = 145 subentries (52 for 252Cf(s.f.)) N.Otsuka 1st RCM of PFNS, 6-9 April 2010 (Vienna)

  4. 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)

  5. 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)

  6. 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)

  7. 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)

  8. 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)

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

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