**1. NAME AND TITLE**

MORSEC-SP2: A Multigroup Cross Section Module for the MORSE Monte Carlo Computer
Code System.

**AUXILIARY ROUTINE**

SBIN: Converts sample problem CASK (22N, 18G) cross sections for H and O to
binary format.

This version of MORSE-SP2 is a revision of MORSEC-SP and incorporates reduced storage
requirements for complex multimedia problems and flexibility in retaining elemental cross section
angular data when describing elemental mixtures.

**2. CONTRIBUTOR**

United Engineers and Constructors Inc., Philadelphia, Pennsylvania.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; Honeywell 66/60.

**4. NATURE OF PROBLEM SOLVED**

MORSEC-SP2 is a cross section processing/interface module for the MORSE Monte Carlo
computer code. It allows the angular dependence of the multigroup transfer function to be represented
with discrete, step and truncated Legender polynomial distributions. The step distribution is always
non-negative and may be used in the random walk and for making point detector estimators. This
version of MORSEC-SP provides an expanded cross section mixing capability.

**5. METHOD OF SOLUTION**

MORSEC-SP2 utilizes a table look up procedure to provide the probability of scattering when
making point detector estimates for a given incident energy group and scattering angle. In the random
walk, the step distributions are converted to cumulative distributions and an angle of scatter is selected
from the cumulative distributions. Step distributions are obtained from calculations using the
converted moments from the given Legendre coefficients of the scattering distributions.

**6. RESTRICTIONS OR LIMITATIONS**

Limitations on individual input parameters are detailed in the user's manual.

**7. TYPICAL RUNNING TIME**

Computer run times are comparable to run times using the MORSEC and MORSEC-SP cross
section modules.

**8. COMPUTER HARDWARE REQUIREMENTS**

MORSEC-SP2 is operable on the Honeywell 66/60.

**9. COMPUTER SOFTWARE REQUIREMENTS**

MORSEC-SP2 was run under the GCOS3 operating system. A Fortran IV compiler is required.

**10. REFERENCES**

N. De Gangi, "A Multigroup Cross Section Module for the MORSE Monte Carlo Computer Code" NU-588 (November 1983).

N. De Gangi and F. Munno, "MORSEC-SP: Incorporation of a Step Function Angular Distribution Option in the MORSEC Cross Section Module," UM-1017 (1979).

N. De Gangi and F. Munno, "MORSEC-SP: A Multigroup Step Function Angular Dependence Option in Morsec," (Summary paper to be published.)

N. De Gangi and F. Munno, "Photon First Collision Fluxes: Further Validation of MORSEC-SP,"
(Summary paper to be published.)

**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**

January 1984.

**KEYWORDS**: GAMMA-RAY; NEUTRON; KERNEL; COMPLEX GEOMETRY;
COMBINATORIAL GEOMETRY