Decomposition of M1 transitions into isoscalar and isovector, spin and orbital contributions

Y. Fujita, T. Adachi, G. P.A. Berg, B. A. Brown, H. Ejiri, H. Fujimura, H. Fujita, M. Fujiwara, K. Hara, M. N. Harakeh, K. Hatanaka, F. Hofmann, J. Kamiya, K. Katori, T. Kawabata, S. Mizutori, P. Von Neumann-Cosel, T. Noro, B. Reitz, A. RichterY. Shimbara, T. Shinada, H. Ueno, M. Yoshifuku, M. Yosoi

研究成果: ジャーナルへの寄稿学術誌査読


The electromagnetic M1 operator contains not only the usually dominant isovector (IV) spin (στ) term, but also IV orbital (lτ), isoscalar (IS) spin (σ) and IS orbital (l) terms. By using the facts that IS and IV terms couple with reverse signs in analogous M1 transitions in Tz = ±1/2 mirror nuclei and that Gamow-Teller (GT) operator contains only στ term, we discuss the separation of IS and IV terms of M1 transitions in Tz = ±1/2 nuclei and the contribution of lτ term in the IV term of Tz = 0 as well as ±1/2 nuclei, respectively. In deriving the latter, effects of meson exchange currents (MEC) are corrected. γ decay and (e, e′) data are used for the study of B(M1) strengths. The B(GT) values are studied in good-resolution (3He, t) reactions at 150 MeV/nucleon.

ジャーナルNuclear Physics A
出版ステータス出版済み - 7月 16 2001

!!!All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学


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