Isospin Mixing in the Isobaric Analog State Derived from the ( p,nIASp̃) Reaction on 140Ce, 172,174,176Yb, and 208Pb

H. Orihara, C. C. Yun, A. Terakawa, K. Itoh, A. Yamamoto, K. Kawami, H. Suzuki, Y. Mizuno, H. Kamurai, Y. Tajima, K. Ishii, Y. Fujii, H. Sagawa, T. Suzuki, and H. Ohnuma
Phys. Rev. Lett. 81, 3607 – Published 26 October 1998
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Abstract

An exclusive coincidence experiment using the (p,nIASp̃) reaction on 140Ce, 172,174,176Yb, and 208Pb was carried out for the first time by measuring decay protons from the isobaric analog states (IAS). Spreading widths of the IAS are deduced from the escape and total widths. The results show a strong isospin dependence which can be explained by the isospin mixing effect due to the coupling to the T0 component among three multiplets T=T01, T0, and T0+1 of isovector monopole states in daughter nuclei. Empirical isospin mixing probabilities are found to be consistent with microscopic sum rule predictions.

  • Received 21 May 1998

DOI:https://doi.org/10.1103/PhysRevLett.81.3607

©1998 American Physical Society

Authors & Affiliations

H. Orihara1, C. C. Yun1, A. Terakawa1, K. Itoh1, A. Yamamoto1, K. Kawami1, H. Suzuki1, Y. Mizuno1, H. Kamurai1, Y. Tajima1, K. Ishii1, Y. Fujii2, H. Sagawa3, T. Suzuki4, and H. Ohnuma5

  • 1Cyclotron and Radioisotope Center, Tohoku University, Sendai, 980-8578 Japan
  • 2Department of Physics, Faculty of Science, Tohoku University, Sendai, 980-8578 Japan
  • 3Center for Mathematical Science, The University of Aizu, Aizu-Wakamatsu, Fukushima, 965-8580 Japan
  • 4Department of Physics, College of Humanities and Science, Nihon University, Tokyo, 156-8550 Japan
  • 5Department of Physics, Chiba Institute of Technology, Chiba, 275-0023 Japan

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Vol. 81, Iss. 17 — 26 October 1998

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