5.2.10. Nuclear reaction model options¶
Value |
Explanation |
(D=1)
|
Nucleon-nucleon cross section options for Bertini model.
|
=0
|
Free (nmtclb25.dat).
|
=1
|
Cugnon old (nmtclb95.dat); the in-medium effect for nucleon-nucleon cross sections is included.
|
=2
|
Cugnon new (nmtclb30.dat).
|
Value |
Explanation |
(D=0)
|
\(\Delta\) angular distribution for Bertini.
|
=0
|
50 % isotropic, 50 % forward.
|
=1
|
All isotropic.
|
=2
|
All forward.
|
Value |
Explanation |
(D=0)
|
Options for neutron-induced fission.
|
=0
|
Use the nuclear data library.
|
=1
|
Neutron multiplicity \(\nu\) and neutron energy spectrum are taken from the literature.
|
Value |
Explanation |
(D=0)
|
Options for the Distorted Wave Born Approximation (DWBA) spectra.
|
=0
|
Without discrete DWBA spectra.
|
=1
|
With discrete DWBA spectra.
|
Value |
Explanation |
(D=0)
|
Treatment of negative-charged particles listed in Table 4.7.3 when they are below cut-off energies.
|
=0
|
Force to be absorbed by nucleus.
|
=1
|
Sets to decay.
|
If iidfs=1 is specified, the multiplicity \(\nu\) and energy spectra of neutrons from neutron-induced fission taken from reference [1] are used instead of the nuclear library data for the following 18 nuclei: U-238, Pu-238, Pu-240, Pu-242, Cm-242, Cm-244, Cf-252, Th-232, U-232, U-233, U-234, U-235, U-236, Np-237, Pu-239, Pu-241, Am-241, and Bk-249.
With the idwba=1 setting, the discrete spectra calculated by the DWBA are added to the neutron and proton spectra obtained using other nuclear reaction models for the following reactions:
\(^7\) Li \((p,n)^7\) Be reactions at 30–400 MeV\(^9\) Be \((p,n)^9\) B reactions at 10–50 MeV\(^{6,7}\) Li \((d,n)^{7,8}\) Be and \(^{6,7}\) Li \((d,p)^{7,8}\) Li reactions at 10–50 MeV\(^9\) Be \((d,n)^{10}\) B and \(^9\) Be \((d,p)^{10}\) Be reactions at 5–25 MeV\(^{12,13}\) C \((d,n)^{13,14}\) and \(^{12,13}\) C \((d,p)^{13,14}\) C reactions at 10–50 MeV
See the reference [2] for more details.
If a particle with a decay channel (See Table 4.7.3 ) has an energy lower than the cut-off, the particle decays completely. Negative-charged pions ( \(\pi^-\) ) with the setting of npidk=0 are forced to be absorbed by nucleus. If \(\pi^-\) is not able to be absorbed in the program, the particle decays (to prevent an infinite calculation loop).