Measurement of polarized target asymmetry on γn→π−p around the second resonance region |
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| Authors: | K Fujii H Hayashii S Iwata R Kajikawa A Miyamoto T Nakanishi Y Ohashi S Okumi H Ozaki T Tauchi T Yamaki K Mori Y Takeuchi |
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| Institution: | Department of Physics, Nagoya University, Nagoya, Japan;Nagoya University College of Medical Technology, Nagoya, Japan;Department of Applied Mathematics, Osaka University, Toyanaka, Japan |
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| Abstract: | The polarized target asymmetry for γn→π?p was measured over the second resonance region from 0.55 to 0.9 GeV at pion c.m. angles between 60° and 120°. A double-arm spectrometer was used with a deuterated butanol target to detect both the pion and the proton, thus considerably improving the data quality. Including the new data in the amplitude analysis, the radiative decay widths of three resonances were determined more accurately than before. The results are compared with various quark models. |
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