1. NAME AND TITLE

MATXUF: On-Line Derivative Method, Spectrum Unfolding Code System for NE-213 Liquid Fast Scintillation Proton Recoil Data.

2. CONTRIBUTOR

University of Missouri-Columbia, Nuclear Engineering Department, Columbia, Missouri.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

MATXUF generates an ``unfolding matrix'' for the analysis of NE-213 liquid scintillation proton recoil spectra. This unfolding matrix can be used in either an off-line or an on-line unfolding environment.

5. METHOD OF SOLUTION

MATXUF uses the derivative method of unfolding which assumes an ideal, theoretical step function relationship between incoming neutrons and the resulting proton recoil distribution. This ideal function is corrected for anisotropic scattering and proton leakage. The code also includes a smoothing technique applied directly to the unfolded result which improves energy identification and results in the ultimate generation of an unfolding matrix.

For off-line application, unfolding can be accomplished by simple multiplication of the proton recoil vector times the unfolding matrix. For on-line application, the unfolding is accomplished one detected recoil proton at a time by using a small computer (in which the matrix has been stored) interfaced to the detection system.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

MATXUF requires 10 seconds of cpu time for a typical case.

8. COMPUTER HARDWARE REQUIREMENTS

MATXUF is operable on the IBM 360/370 computers. It uses approximately 320 K of memory.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required. MATXUF has been run using both the WATFIV and Fortran IV level G compilers.

10. REFERENCES

``User's Guide for MATXUF: NE-213 Proton Recoil Unfolding Matrix Generator,'' Informal Report.

William H. Miller, ``MATXUF: On-Line, Real Time Derivative Method for Neutron Spectrum Unfolding,'' Nucl. Instr. and Meth. 153 (1978) 535-541.

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and a reel of magnetic tape which contains the source code and sample problem input written in EBCDIC card images, plus output from the sample problem written in list format; total records 1309.

12. DATE OF ABSTRACT

March 1984.