1. NAME AND TITLE OF DATA LIBRARY

ECPL82: Evaluated Charged-Particle Data Library.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

No retrieval program is included in the package.

3. CONTRIBUTOR

Lawrence Livermore National Laboratory, Livermore, California.

4. HISTORICAL BACKGROUND AND INFORMATION

The LLNL Evaluated Nuclear Data Library has existed since 1958, in a succession of forms and formats. In its earliest form it was a series of internal memos containing tabulations of cross sections and angular distributions for a few isotopes to be used in neutronics calculations. It was soon found that some type of mechanization should be undertaken both for efficiency and for convenience. Therefore, the library went through stages of punched card and punched paper-tape, and then to the first magnetic-tape BCD card image form; it could then be translated with relative ease to another computer-readable form, if desired. It is currently maintained as a Cray-1 binary-mode file and contains data for neutron-induced reactions, photon interactions with matter, and charged-particle-induced nuclear reactions. Ten different particles are presently defined. More can be added as needed. The data are made available on two (1.44MB) DOS diskettes in a transmission format and layout which are described in the document.

5. APPLICATION OF THE DATA

ECPL82 is a collection of evaluated data for charged-particle-induced reactions. It is maintained in a computer-oriented system.

6. SOURCE AND SCOPE OF DATA

All interpolable quantities for charged particle-induced reactions are presented so that linear interpolation between successive entries yields values that are consistent with stated experimental errors, where experiments exist, or that adhere to an assumed law, such as l/v energy dependence, within a small fraction (typically 1%). In the case of an assumed energy-dependence law for cross sections, this is accomplished by creating a large number of (energy, cross section) pairs by computer and subsequently thinning the points to a specified accuracy, using the subroutine THINER.

All angular distributions are differential probabilities normalized to an integral of unity over the cosine of the scattering angle. All energy distributions of secondary particles are presented as normalized Legendre polynomial representations. The linear interpolation will construct an acceptable angular distribution at an intermediate energy.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

Not applicable.

8. DATA FORMAT AND COMPUTER

Transmittal format of the Livermore evaluated nuclear data file. Card images; CDC/IBM.

9. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for ECPL82.

10. REFERENCE

R. J. Howerton, R. E. Dye, S. T. Perkins, "Evaluated Nuclear Data Library," UCRL-50400, Vol. 4 Rev. 1 (October 8, 1981).

11. CONTENTS OF LIBRARY

Included are the referenced document and two DS/HD (1.44 MB) diskettes, which contains the cross section data.

12. DATE OF ABSTRACT

November 1983.