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Request ID7 Type of the request General request
TargetReaction and processIncident EnergySecondary energy or angleTarget uncertaintyCovariance
 26-FE-56 (n,xn) SIG,DDX  7 MeV-20 MeV 1MeV-20MeV 30 
FieldSubfieldDate Request createdDate Request acceptedOngoing action
 Fission,ADS Shielding, Medical, SNS 13-JUL-06 16-APR-07 

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Requester: Prof. Arjan KONING at NRGPETTEN, NED

Project (context): JEFF, Model calculations

New double differential experimental data for the Fe(n,xn) reaction will allow a crucial test of the pre-equilibrium models underlying neutron transport libraries for spallation neutron sources. They will thereby enhance the confidence in neutron transport calculations for spallation neutron sources such as envisioned for accelerator driven systems.

30% for the double-differential spectra

Justification document:
A global pre-equilibrium analysis from 7 to 200 MeV based on the optical model potential, A.J. Koning and M.C. Duijvestijn, Nucl. Phys. A744, 15 (2004).

Comment from requester:
There are hundreds of (p,xp) and (p,xn) spectra in the 20-200 MeV range available, several (n,xp) spectra, but there are basically no double-differential (n,xn) spectra available. The presence of such data would heavily constrain the pre-equilibrium model paraneters and thereby result in a much better prediction of neutron-induced spectra in the entire 50-200 MeV range. Since high-energy spectra are rather structureless the choice of target is less essential.

Additional file attached:

Review comment:

Entry Status:
Completed (as of SG-C review of May 2018)

Main recent references:
Please report any missing information to


  • M. Herman et al., Evaluation of Neutron Reactions on Iron Isotopes for CIELO and ENDF/B-VIII.0, NDS 148 (2018) 214