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1 | \section{Reaction initial state.} |
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2 | |
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3 | \hspace{1.0em} The GEANT4 precompound model is considered as an extension |
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4 | of the hadron kinetic model. It gives a possibility to extend the low |
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5 | energy range of the hadron kinetic model for |
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6 | nucleon-nucleus inelastic collision and it provides a "smooth" transition |
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7 | from kinetic stage of reaction described by the hadron kinetic model to |
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8 | the equilibrium stage of reaction described by the equilibrium deexcitation |
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9 | models. |
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10 | |
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11 | The initial information for calculation of pre-compound |
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12 | nuclear stage consists from the atomic mass number $A$, charge $Z$ of residual |
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13 | nucleus, its four momentum $P_0$, |
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14 | excitation energy $U$ and number of |
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15 | excitons $n$ equals the sum of number of particles $p$ (from them $p_Z$ |
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16 | are charged) and number of holes $h$. |
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17 | |
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18 | At the preequilibrium stage of reaction, we following the \cite{GMT83} approach, |
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19 | take into account all |
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20 | possible nuclear transition the number of excitons $n$ with $\Delta n = |
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21 | +2, -2, 0$ \cite{GMT83}, which defined by transition probabilities. |
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22 | Only emmision of neutrons, protons, deutrons, thritium and helium nuclei |
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23 | are taken |
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24 | into account. |
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