1. NAME AND TITLE

REFERDOU: Code System for NE-213 Unfolding of Neutron Spectra up to 100 MeV with Response Function Error Propagation.

AUXILIARY ROUTINES

RESU: NE-213 Neutron Response Function Calculation Code

INTER: Interpolation and Gauss-Spreading Code for NE-213 Response Functions

FERDOU: Revised FERDO Unfolding Code Which Can Propagate the Response Function Error

2. CONTRIBUTOR

Institute for Nuclear Study, University of Tokyo, Tokyo, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; FACOM

4. NATURE OF PROBLEM SOLVED

The REFERDOU system can be used to calculate the response function of a NE-213 scintillation detector for energies up to 100 MeV, to interpolate and spread (Gaussian) the response function, and unfold the measured spectrum of neutrons while propagating errors from the response functions to the unfolded spectrum.

5. METHOD OF SOLUTION

The calculation of response functions for energies up to 100 MeV is done with the RESU Monte Carlo. The code uses measured light output data, new cross-section data based on ENDF/B-IV, PSR-14/O5S, and other sources, and two-body reaction models (rather than evaporation) for carbon reaction processes. Interpolation and Gaussian spreading is done with the INTER program. The unfolding with propagation of errors (uncertainties) is accomplished with FERDOU, a modified version of the PSR-102/FERDO code system.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

The package was not checked for typical running time by RSIC.

8. COMPUTER HARDWARE REQUIREMENTS

A FACOM M-380 computer is required.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCES

Y. Uwamino, K. Shin, M. Fujii, and T. Nakamura, "Light Output and Response Function of An NE-213 Scintillator to Neutrons Up to 100 MeV," Nuclear Instruments and Methods Vol. 204, No.1 (179-189) (December 1982).

K. Shin, Y. Uwamino and T. Hyodo, "Propagation of Errors from Response Functions to Unfolded Spectrum," Nuclear Technology, Vol. 53 (78-85) (April 1981).

Y. Uwamino, "User's Manual of NE-213 Neutron Response Function Calculation Code - RESU," Informal Notes (January 1984).

Y. Uwamino, "User's Manual of Interpolation and Gauss-Spreading Code for NE-213 Response Functions -INTER," Informal Notes (June 1984).

Y. Uwamino, "User's Manual of Revised FERDO (FERDO-U) Code," Informal Notes (January 1984).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source codes, data, sample problem input and output.

12. DATE OF ABSTRACT

December 1987.