1 | \section{The intermediate energy $\gamma$-nucleon and $\gamma$-nucleus interactions.} |
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2 | |
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3 | \hspace{1.0em} |
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4 | We use the hadron kinetic model to perform simulation of $\gamma$-nucleus |
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5 | inelastic collisions at intermediate energies. In this particular model |
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6 | interaction of a particle with target nucleus is reduced to the interaction of |
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7 | a particle with intranuclear nucleons. |
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8 | In the hadron kinetic model we realized several different mechanisms of the |
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9 | $\gamma$-nucleon interaction. |
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10 | |
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11 | The first one is the absorption of $\gamma$-quantum by a quasideutron pair |
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12 | \begin{equation} |
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13 | \label{IEGI1} \gamma + (np)\rightarrow np. |
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14 | \end{equation} |
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15 | The photoabsorption cross section calculated according to quasi-deutron model |
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16 | \cite{CS66}, \cite{BGIJT74} |
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17 | \begin{equation} |
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18 | \label{IEGI2}\sigma_{A}=kZ(1-Z/A)\sigma_{D}, |
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19 | \end{equation} |
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20 | where $\sigma_{D}$ is the cross section for deutron photodisintegration and |
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21 | $A$, $Z$ are the mass and charge numbers of the nucleus in question, |
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22 | respectively. The model parameter $k=10$ was taken. |
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23 | |
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24 | The second one is the excitation of resonance and production of mesons: |
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25 | \begin{equation} |
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26 | \label{IEGI3} \gamma N\rightarrow \Delta(1232), |
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27 | \gamma N \rightarrow N^{*}(1535) |
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28 | \end{equation} |
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29 | |
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30 | At high energy the Regge approach is used to calculate $\gamma$-nucleon |
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31 | cross sections. The inelastic $\gamma$-nucleon is |
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32 | simulated using the parton string |
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33 | model. |
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