3. DESCRIPTION OF PROGRAM OR FUNCTION
CMUP2 is a program for calculating the neutron or charged particles (p, d, t, He3, alpha) induced reactions of medium-heavy nuclei in the incident energy range up to 50 MeV.
CMUP2 is constructed within the framework of optical model, preequilibrium (PE) statistical theory based on the exciton model, and the evaporation model. In the first, second, and third particle emitting processes, we consider preequilibrium emission and evaporation; in the fourth particle emitting process, we only consider evaporation. For composite particle emission, the pick-up mechanism of cluster formation was used in the first, second, and third particle emitting processes.
In the energy range up to 50 MeV, CMPU2 can give the calculated results for optical model quantities and all kinds of cross sections in first, second, third, and fourth particle emitting processes. When the incident energy is near 50 MeV, the fourth particle emitting process includes the contributions of the fifth particle emitting process for heavier nuclei. CMUP2 also gives energy spectra of all emitted particles in first and second particle emitting processes.
The output data of CMUP2 include: total and shape elastic scattering cross sections (only for neutron as projectile); total reaction cross section; radiative capture cross section; (x, x') reaction cross sections, (x, x1x2) reaction cross sections, and (x, x1x2x3) reaction cross sections, where x', x1, x2, and x3 may be n, p, t, He3, d, or alpha; (x, x1x2x3x4) reaction cross sections, where x1 and x2 can be n, p, t, He3, d, or alpha, but x3 and x4 can only be n or p; the elastic scattering angular distribution and the ratio of the elastic scattering differential cross section to the Rutherford differential cross section; the energy spectra of x' particle in (x, x') reaction and of x1 and x2 particles in (x, x1x2) reaction.
In order to make convenient comparison with experimental data we also give the sum of cross sections of all reactions which lead to the same residual nucleus, for example, S(x,2np)+S(x,nd)+S(x,t). We call them yield cross sections.
In CMUP2, we give the emission cross section of particle y in reaction (x, yx') in one- and two-particle emission processes without regard to what particle x' is and the corresponding energy spectra of particle y in reaction (x, yx'), where y can be n, p, t, He3, d, or alpha. We also give the total emission cross section of particle y in reaction (x, yx') in one-, two-, three-, and four- particle emission processes without regard to what particles x' are and the corresponding multiplicity of particle y in reaction (x, yx'), where y can be n, p, t, He3, d, or alpha.