**1. NAME AND TITLE**

MORSE-H: A Revised Version of the MORSE Monte Carlo Radiation Transport Code
System. We recommend C00474/ALLCP/02 MORSE-CGA.

MORSE-H is a collection of useful options for use with MORSE codes.

**2. CONTRIBUTOR**

UKAEA AERE Harwell, Oxfordshire, England, via the OECD NEA Data Bank, Gif-sur-Yvette,
Cedex, France.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; IBM 370/3033.

**4. NATURE OF PROBLEM SOLVED**

The original MORSE code (CCC-127/MORSE) was a multipurpose neutron and gamma-ray
transport Monte Carlo code. It was designed as a tool for solving most shielding problems. Through
the use of multigroup cross sections, the solution of neutron, gamma-ray, or coupled neutron-gamma-ray problems could be obtained in either the forward or adjoint mode. Time dependence for both
shielding and criticality problems is provided. General three-dimensional geometry could be used with
an albedo option available at any material surface. Isotropic or anisotropic scattering up to a P_{16}
expansion of the angular distribution was allowed.

CCC-203/MORSE-CG incorporated the Mathematical Applications, Inc. (MAGI) combinatorial geometry routines.

CCC-368/MORSE-B modified the Monte Carlo neutron and photon transport computer code MORSE-CG by adding routines which allow various flexible options.

MORSE-H is an attempt to bring together into one program the most commonly used options. This
has been done by combining routines from MORSE-CG, some of them modified, with those of
MORSE/B, also with some modification, and some additional routines. The routines of MORSE-B
were, in turn, partly derived from modifications of routines from CCC-258/MORSE-E.

**5. METHOD OF SOLUTION**

Fluxes of neutrons or photons (or both in a coupled case) may be scored by either a next-event estimator, which provides the fluence at point detectors, or by a track-length estimator, which provides volume-integrated fluxes. In either case a restart option is available to enable a second or subsequent run to continue tracking particles in a case which was terminated for any reason.

The specification of a fixed source of particles is by up to 20 separate source regions of various
geometric shapes, with particles born isotropically, monodirectional, or with directions in a defined
code about the +z direction.

**6. RESTRICTIONS OR LIMITATIONS**

None noted.

**7. TYPICAL RUNNING TIME**

Information not available at this time.

**8. COMPUTER HARDWARE REQUIREMENTS**

MORSE-H is operable on the IBM 370/3033 computers.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A Fortran H compiler is required.

**10. REFERENCES**

**a. Included in documentation:**

N. P. Taylor and J. Needham, "MORSE-H A Revised Version of the Monte Carlo Code
MORSE," AERE-R 10432 (1982).

**b. Background information:**

M. B. Emmett, "The MORSE Monte Carlo Radiation Transport Code System," ORNL-4972 (February 1975).

C. Ponti and R. Van Heusden, "MORSE-E, A New Version of the MORSE Code," EUR5212e (1974).

N. P. Taylor, "MORSE-B A Revised Version of the Monte Carlo Code MORSE," University
of Birmingham Dept. of Physics PN: 80-05, England (1980).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document (10.a) and one (1.2MB) DOS diskette which contains the
source codes and sample problem input and output.

**12. DATE OF ABSTRACT**

September 1985; update January 1986.

**KEYWORDS: ** MONTE CARLO; NEUTRON; GAMMA-RAY; MULTIGROUP; COMPLEX
GEOMETRY; COMBINATORIAL GEOMETRY; ADJOINT