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