PROGRAM SUMMARY
Title of program:
MCEF
Catalogue identifier:
ADQC
Ref. in CPC:
145(2002)385
Distribution format: tar gzip file
Operating system: MS-DOS 6.00, Windows 95, NT 4.0, Linux
High speed store required:
12MK words
Number of bits in a word:
16
Number of lines in distributed program, including test data, etc:
368
Keywords:
Photonuclear reactions, Evaporation, Fission, Monte Carlo method,
Nuclear physics, Nuclear reaction.
Programming language used: Java
Computer:
Pentium Intel 233 ,
Nature of physical problem:
Brazilian Center for Physical Research CBPF/MCT
The competition between evaporation and fission is an important problem
in intermediate and high energy nuclear reactions. Here, neutrons,
protons, alphas and possibly other particles escape from the excited
nucleus in competition with the fission process. Considering the fact
that an exact calculation including all the channels in this nuclear
reaction could be a complex problem, a statistical description of all
these possible decaying modes could be a major simplification. In fact,
rough analytic approximations are possible, and the results are in
reasonable agreement with the experimental data for relatively low
reaction energies, where the most important reaction channels are just
the neutron evaporation and fission. At higher energies, other
channels, like proton and alpha particle evaporation, become important,
and the analytical calculation of the reaction process is much more
complex.
Method of solution:
The most reasonable way to avoid the complexity of these problems, and
to obtain the required data is the Monte Carlo (MC) simulation. In
fact, this method is particularly suited for processes which are
intrinsically statistical in their nature, as the nuclear reactions
described above. Also, the object oriented approach for the algorithm
is useful for solving this problem, since it is appropriate for the
atomic nucleus problems, and turns the MC calculation clear stated
problem.
Typical running time:
Depends on the desirable statistical accuracy. For the particular set
of initial parameters shown as an example in this work, the running time