1. NAME AND TITLE OF DATA LIBRARY

FLEP: Coefficients for the Analytic Representation of Nonelastic Cross Sections and Particle-Emission Spectra from Various Nucleon-Nucleus Collisions in the Energy Range 25 to 400 MeV.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAM

NCDATA: A Program for Interpolating between the Energies and Nuclei Specified in the FLEP Data Library.

3. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

4. HISTORICAL BACKGROUND AND INFORMATION

The Low-Energy Intranuclear Cascade Code System called LEP has been used to generate particle-production spectra from a variety of nucleon-nucleus collisions in the energy range of 25 to 400 MeV. In order to make these data more accessible, analytic representations of the data have been obtained by a linear least-squares fitting procedure. The NCDATA computer program was written to provide a means of interpolating the FLEP library to obtain data for incident nucleon energies and target nuclei not specifically included.

5. APPLICATION OF THE DATA

The analytic representations are intended for use as input cross-section data to transport codes. They have been used most extensively in transport codes that utilize the method of discrete ordinates.

6. SOURCE AND SCOPE OF DATA

The fitting procedure is described in the packaged documentation. Analytic fits are given for both protons and neutrons incident on the elements C, O, Al, Cr, Cu, Ru, Ce, W, Pb, and U for a) the nonelastic cross section as a function of energy; b) the cascade neutron- and proton-emission spectra in the angular intervals 0-30°, 30-60°, 60-90°, and 90-180°; c) the evaporation neutron- and proton-emission spectra (assumed isotropic); and d) the cascade neutron- and proton-emission spectra integrated over all angles. Plots are available (on microfiche) which compare the original data generated by LEP with the analytic representation resulting from the fitting procedure.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

NCDATA, by means of interpolation, will provide an analytic representation of the particle-emission spectra for neutrons and protons having energies between 25 and 400 MeV incident on any element with atomic weight between 12 and 238.

8. DATA FORMAT COMPUTER

BCD/EBCDIC card images; IBM 360/370.

9. TYPICAL RUNNING TIME

On the IBM 360/75 computer, it requires 47 seconds to generate data for protons incident on iron.

10. REFERENCES

R. G. Alsmiller, Jr., M. Leimdorfer, and J. Barish, "Analytic Representation of Nonelastic Cross Sections and Particle-Emission Spectra from Nucleon-Nucleus Collisions in the Energy Range 25 to 400 MeV," ORNL-4046 (April 1967).

R. G. Alsmiller, Jr., M. Leimdorfer, and J. Barish, "Analytic Representation of Nonelastic Cross Sections and Particle-Emission Spectra from Nucleon-Nucleus Collisions in the Energy Range 25 to 400 MeV," ORNL-4046 Errata.

R. G. Alsmiller, Jr. and J. Barish, "NCDATA - Nuclear Collision Data for Nucleon-Nucleus Collisions in the Energy Range 25 to 400 MeV," ORNL-4229 (February 1968).

R. G. Alsmiller, Jr., M. Leimdorfer, and J. Barish, "Analytic Representation of Nonelastic Cross Sections and Particle-Emission Spectra from Nucleon-Nucleus Collisions in the Energy Range 25 to 400 MeV," Microfiche Contents (April 1967).

11. CONTENTS OF LIBRARY

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

12. DATE OF ABSTRACT

November 1972; updated May 1984.