| 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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