phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV

T. Ishikawa , D. S. Ahn , J. K. Ahn , H. Akimune , W. C. Chang , S. Date , H. Fujimura , M. Fujiwara

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K. Hicks T. Hotta K. Imai H. Kawai K. Kino H. Kohri T. Matsumura T. Mibe K. Miwa M. Miyabe M. Morita T. Murakami N. Muramatsu H. Nakamura M. Nakamura T. Nakano M. Niiyama M. Nomachi Y. Ohashi T. Ooba D.S. Oshuev C. Rangacharyulu A. Sakaguchi Y. Shiino Y. Sakemi H. Shimizu Y. Sugaya M. Sumihama Y. Toi H. Toyokawa C. W. Wang T. Yorita M. Yosoi R. G. T. Zegers

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classification ⚛️ nucl-ex

keywords photo-productionbeendependencenumbersigmaangleschangecross

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The photo-production of $\phi$ mesons from Li, C, Al, and Cu at forward angles has been measured at $E_gamma$=1.5--2.4 GeV. The number of events for incoherent phi photo-production is found to have a target mass number dependence of $A^{0.72\pm 0.07}$ in the kinematical region of $|t|\le 0.6$ ${\rm GeV}^2/c^2$. The total cross section of the $\phi$-nucleon interaction, $\sigma_{\phi N}$, has been estimated as $35^{+17}_{-11}$ mb using the $A$-dependence of the $\phi$ photo-production yield and a Glauber-type multiple scattering theory. This value is much larger than $\sigma_{\phi N}$ in free space, suggesting that the $\phi$ properties might change in the nuclear medium.

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phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV

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