Asymmetry of Beta-Ray Angular Distribution in Polarized ^<12>B and ^<12>N and Second-Class Current

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概要

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• An explicit formula for beta-ray angular distribution in the decay of polarized nuclei is given by taking into account the radiative corrections, Coulomb corrections of the finite-size nucleus, weak magnetism, induced pseudoscalar, second-class induced tensor, and contributions of the d-wave leptons. Generally speaking, the radiative corrections are almost the same for P_0 (cosθ) and P_1 (cosθ) terms. In particular, the logarithmic divergence disappears for the asymmetry factor in the case of the Gamow-Teller transitions. And the effect of the induced pseudoscalar current is extremely small. Experimental data on the beta decays of polarized ^<12>B and ^<12>N are carefully investigated, and it is shown that these data are in favor of the existence of the second-class induced tensor current. Contributions of the ∫(σ・r)r and ∫σr^2 terms, which are evaluated with available nuclear models, are found to be negligible. The effect of the exchange currents is also discussed in connection with the elementary particle treatment of the nuclear beta decay.

• 理論物理学刊行会の論文
• 1976-10-30

著者

• Morita Masato

  Department Of Anesthesiology And Medical Crisis Management Nagoya City University Graduate School Of

• MIHARA Mototsugu

  Graduate School of Science, Osaka University

• Ohtsubo Hisao

  Department Of Applied Mathematics Faculty Of Engineering Science Osaka University

• Kubodera Kuniharu

  Department Of Physics And Astronomy The John Hopkins University

• NISHIMURA Mitiaki

  Department of Physics, Osaka University

• SHIMIZU Asao

  Department of Physics, Osaka University

• Shimizu Asao

  Department Of Physics Osaka University

• Nishimura Mitiaki

  Department Of Physics Osaka University

• Miki Masami

  Department of Earth & Space Science, Graduate School of Science, Osaka University

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