Photoproduction of Positive Pions from Carbon Nuclei

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概要

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• Positive pions with energies ranging from 30MeV to 150MeV were produced on a carbon target by the bremsstrahlung beam from the 750-MeV electron-synchrotron and detected by means of a π-μ decay counter telescope at an angle of 90° in the laboratory. The counts were corrected for the electronic efficiency of the pion counting system and for the loss of pions in the detection system by decay in flght, nuclear absorption, nuclear scattering and multiple Coulomb scattering. Absolute cross sections of the pion production are given as a function of the peak bremsstrablung energies extending from 180MeV to 550MeV. Applying the photon difference method to the cross section per equivalent quantum, the differential cross sections, (d^<2>σ/dΩdT_π) and (dσ/dΩ), are obtained, and compared with theoretical values, which are calculated on the bases of the impulse and closure approximation, the nuclear momentum distribution of a Gaussian type of the average kinetic energy of 19MeV, and the optical model treatment of the final pion-nucleus interactions. Fair agreements between the experiment and the theory are obtained, and the results support the assumption of the initial production of pions throughout the nuclear vplume. A remarkable 3-3 resonance effect is also found in the case of the bound nucleon, and no appreciable nuclear effect other than those due to the nuclear momentum distribution and final state interactions could be observed.

• 社団法人日本物理学会の論文
• 1964-10-05

著者

• Nagashima Yorikiyo

  Department of Physics, Osaka University

• KOBAYASHI Masaaki

  Department of Bone and Orthopaedics, Nagoya City University Graduate School of Medical Sciences

• Kikuta Seishi

  Institute Of Physics College Of General Education University Of Tokyo

• KIMURA YOSHITAKA

  Department of Obstetrics and Gynecology, Tohoku University School of Medicine

• KIFUNE Tadashi

  Department of Physics, University of Tokyo

• Kondo Kunitaka

  Institute For Nuclear Study University Of Tokyo:(prsent Address) Department Of Physics Tsukuba Unive

• Kondo Kunitaka

  Department Of Physics Faculty Of Science University Of Tokyo

• Kobayashi Masaaki

  Institute For Nuclear Study University Of Tokyo:(prsent Address) Bookhaven National Laboratory Upton

• Kato Sadayuki

  Department Of Physics Faculty Of Science

• Kifune Tadashi

  Institute Of Space And Aeronautical Science The University Of Tokyo

• Kifune Tadashi

  Department Of Physics The University Of Tokyo

• Kimura Yoshitaka

  National Laboratory For High Energy Physics

• Kimura Yoshitaka

  Department Of Applied Physics University Of Tokyo

• NISHIKAWA Tetsuji

  Department of Physics, University of Tokyo

• KABE Seiji

  Department of Physics, The University of Tokyo

• Nagashima Yorikiyo

  Department Of Physics Osaka University

• Nagashima Yorikiyo

  Department Of Physics The University Of Tokyo

• Kimura Yoshitaka

  Department Of Applied And Environmental Chemistry Kitami Institute Of Technology

• Nishikawa Tetsuji

  Department Of Physics Faculty Of Science University Of Tokyo:(prsent Address) National Laboratory Fo

• Nishikawa Tetsuji

  Department Of Physics Faculty Of Science University Of Tokyo

• Nishikawa Tetsuji

  Department Of Physics Faculty Of Sciencc University Of Tokyo

• Kobayashi Masaaki

  Department Of Anesthesiology Osaka City General Hospital And Children's Hospital

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