1 | \chapter{Coherent elastic scattering} |
---|
2 | |
---|
3 | \section{Nucleon-Nucleon elastic Scattering} |
---|
4 | The classes G4LEpp and G4LEnp provide data-driven models for |
---|
5 | proton-proton (or neutron-neutron) and neutron-proton elastic |
---|
6 | scattering over the range 10-1200 MeV. Final states (primary |
---|
7 | and recoil particle) are derived by sampling from tables of |
---|
8 | the cumulative distribution function of the centre-of-mass scattering |
---|
9 | angle, tabulated for a discrete set of lab kinetic energies from |
---|
10 | 10 MeV to 1200 MeV. The CDF's are tabulated at 1 degree intervals and |
---|
11 | sampling is done using bi-linear interpolation in energy and |
---|
12 | CDF values. The data are derived from differential cross sections |
---|
13 | obtained from the SAID database, R. Arndt, 1998. |
---|
14 | |
---|
15 | In class G4LEpp there are two data sets: one including Coulomb effects |
---|
16 | (for p-p scattering) and one with no Coulomb effects (for n-n |
---|
17 | scattering or p-p scattering with Coulomb effects suppressed). |
---|
18 | The method G4LEpp::SetCoulombEffects can be used to select the |
---|
19 | desired data set: |
---|
20 | \begin{itemize} |
---|
21 | \item SetCoulombEffects(0): No Coulomb effects (the default) |
---|
22 | \item SetCoulombEffects(1): Include Coulomb effects |
---|
23 | \end{itemize} |
---|
24 | The recoil particle will be generated as a new secondary particle. |
---|
25 | In class G4LEnp, the possiblity of a charge-exchange reaction is |
---|
26 | included, in which case the incident track will be stopped and both |
---|
27 | the primary and recoil particles will be generated as secondaries. |
---|
28 | |
---|
29 | \newpage |
---|
30 | |
---|
31 | |
---|
32 | |
---|
33 | |
---|
34 | %%% Local Variables: |
---|
35 | %%% mode: latex |
---|
36 | %%% TeX-master: " " |
---|
37 | %%% End: |
---|