Photoproduction of η-mesons off C and Cu nuclei for photon energies below 1.1 GeV

T. Kinoshita , H. Yamazaki , H. Fukasawa , K. Hirota , T. Ishikawa , J. Kasagi , A. Kato , T. Katsuyama

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K. Kino F. Miyahara T. Nakabayashi K. Nawa K. Okamura Y. Saitoh K. Satou M. Sengoku H. Shimizu K. Suzuki S. Suzuki T. Terasawa H. Kanda K. Maeda T. Takahashi Y. Aruga T. Fujinoya A. Iijima M. Itaya Y. Ito T. Iwata H. Kato T. Kawamura T. Michigami M. Moriya T. Sasaki Y. Tajima S. Takita T. Noma M. Yamamoto H.Y. Yoshida Y. Yoshida O. Konno T. Maruyama T. Yorita

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classification ⚛️ nucl-ex

keywords resonancecrossenergiesexcitationmesonmesonsmodelphoton

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The $\eta$-meson photoproduction cross sections have been measured on the C and Cu targets for the photon energies between 600 and 1100 MeV to investigate the behavior of the $S_{11}$(1535) resonance in a nucleus. The excitation functions of the cross section as well as the angular and momentum distributions of $\eta$-mesons are in quantitative agreement with the Quantum Molecular Dynamics (QMD) model calculations in which the $\eta$-meson emission processes other than the $S_{11}$(1535) resonance are also incorporated as proposed in the $\eta$-MAID model. It is shown that the excitation of the $D_{15}$(1675) resonance might play an important role for $E_{\gamma}>900$ MeV.

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Photoproduction of η-mesons off C and Cu nuclei for photon energies below 1.1 GeV

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