1. NAME AND TITLE

SPAR: Calculation of Stopping Powers and Ranges for Muons, Charged Pions, Protons and Heavy Ions.

2. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/370 (A) and CDC 6600 (B).

4. NATURE OF PROBLEM SOLVED

SPAR computes the stopping powers and ranges for muons, pions, protons, and heavy ions in any nongaseous medium at energies from zero to several hundred GeV.

5. METHOD OF SOLUTION

A different calculational procedure is used to compute the stopping powers in each of three (beta,z) regions, where beta is the speed of the particle relative to the speed of light and z is the nuclear charge of the particle. The procedures are described in the code document.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

On the IBM 360/91, about one second is required to compute stopping powers and ranges at about 100 energy points for one stopping medium. The packaged sample problem executed in 10 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

SPAR is operable on the IBM 360/370 computers with standard I-O. It uses 96 K storage in the GO step.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN IV compiler is required.

10. REFERENCE

T. W. Armstrong and K. C. Chandler, "SPAR, A FORTRAN Program for Computing Stopping Powers and Ranges for Muons, Charged Pions, Protons, and Heavy Ions," ORNL-4869 (May 1973).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

October 1975.

KEYWORDS: STOPPING POWER; RANGE; CHARGED PARTICLES; MESON; PROTON; HEAVY IONS