|
Nuclear reactions can result in a number of different products,
including photons, neutrons, light charged particles, and heavy
residual nuclei. The identities of the products are sometimes
implicit in the MT number for the reaction, and they are sometimes
given explicitly in the section of File 6 corresponding to the
reaction. When the products are implicit, they are produced with
integer yields. The following table gives some common examples:
| MT | products |
| 22 | 1 neutron, 1 alpha, residual |
| 103 | 1 proton, residual |
| 111 | 2 protons, residual |
| 113 | 1 triton, 2 alphas, residual |
Of course, the residual could also be a light charged particle, and
it may contribute to the gas production cross section.
Many of the newer evaluations now available use File 6 to provide
a complete accounting of all the particles produced in a nuclear
reaction, including their yields and their distributions in angle
and energy. If the section in File 6 uses a simple MT number, like
those tabulated above, the explicit yields will be the same as the
implicit ones. However, it is also possible to use MT=5 with
File 6. This MT is the sum over a number of reaction channels,
and the particle yields do not have to be integers. GASPR is
able to take account of these non-integer particle yields and
add the correct contributions to the total gas production.
|