[1208] | 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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