| 1 | \section{Complementary parameterised and theoretical treatment}
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| 2 |
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| 3 | Absorption of negative pions and kaons at rest from a nucleus
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| 4 | is described in literature
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| 5 | \cite{Gadioli}, \cite{Chiang}, \cite{Ashery}, \cite{Weyer}
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| 6 | as consisting of two main components:
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| 7 | \begin{itemize}
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| 8 | \item a primary absorption process, involving the interaction of the
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| 9 | incident stopped hadron with one or more nucleons of the target nucleus;
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| 10 | \item the deexcitation of the remnant nucleus, left in an excitated
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| 11 | state as a result of the occurrence of the primary absorption process.
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| 12 | \end{itemize}
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| 13 |
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| 14 | This interpretation is supported by several experiments
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| 15 | \cite{Hartmann}, \cite{Madley}, \cite{Schleputz}, \cite{Orth},
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| 16 | \cite{Pruys}, \cite{Heusi}, \cite{Isaak},
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| 17 | that have measured various features characterizing these processes.
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| 18 | In many cases
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| 19 | the experimental measurements are capable to distinguish the final
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| 20 | products originating from the primary absorption process and those
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| 21 | resulting from the nuclear deexcitation component.
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| 22 |
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| 23 | A set of stopped particle absorption processes is implemented in GEANT4,
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| 24 | based on this two-component model (PiMinusAbsorptionAtRest and
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| 25 | KaonMinusAbsorptionAtRest classes, for $\pi^{-}$ and $K^{-}$ respectively.
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| 26 | Both implementations adopt the same approach:
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| 27 | the primary absorption component of the process is parameterised,
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| 28 | based on available experimental data;
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| 29 | the nuclear deexcitation component is handled through the theoretical models
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| 30 | described elsewhere in this Manual.
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| 31 |
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