The Coupling of the Spin-Dipole Mode with the Dipole Oscillations : E1 Radiative Widths of Isobaric Analog States in Pb^<207> and Bi^<209>

概要

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The coupling of the spin-flip dipole mode with the dipole oscillation is studied through the analysis of photoabsorption cross sections in light nuclei and also E1 radiative widths from isobaric analog states in heavy ones. It is shown that this coupling is reasonably understood by the central force and the tensor force, where the latter works additively to the former. The role of the two-body spin-orbit force has only a minor role for this coupling, for the main coupling terms of this force vanish so long as the shell model wave functions are assumed. The anomalously large E1 radiative width of the isobaric analog state in Bi^<209>, which is deduced from the Bi^<209> (e,e´p), Pb^<208> reaction at Tohoku University, cannot be explained from our studies. However, our results are consistent with the value obtained from the Pb^<208> (p, γ_0) Bi^<209> reaction at the State University of New York at Stony Brook.
理論物理学刊行会の論文
1972-09-25