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Nuclear Spin Alignment of 12,13B Produced in Heavy Ion Collisions

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Abstract

The nuclear spin alignments of the β-emitting fragments 12B(I π=1+, T 1/2=20.2 ms) and 13B(I π=3/2−, T 1/2=17.4 ms) produced in the 100A-MeV 13C, 15N + 9Be collisions respectively have been observed for the first time detecting asymmetric β-ray emission from these nuclei. By means of the spin manipulation technique based on the hyperfine interaction of B isotopes in TiO2, both the polarization P and the alignment A were determined reliably. The obtained P and A were significantly smaller than the expectation from the kinematical model. From the fact that the quenching factors for P and A are almost the same, there may be some depolarization mechanism in the collision process itself.

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Authors and Affiliations

  1. Department of Physics, Osaka Univ., Toyonaka, Osaka, 560-0043, Japan

    T. Nagatomo, K. Matsuta, K. Hashimoto, M. Ota, K. Arimura, K. Minamisono, T. Sumikama, M. Ogura, T. Iwakoshi, T. Miyake, S. Kudo, K. Akutsu, T. Minamisono, M. Fukuda & M. Mihara

  2. Kochi Univ. of Technology, Kochi, 782-8502, Japan

    S. Momota & Y. Nojiri

  3. NIRS, Chiba, Inage, 263-0024, Japan

    A. Kitagawa, M. Torikoshi, M. Kanazawa, M. Suda & M. Hirai

  4. Lawrence Berkeley Laboratory, Berkeley, CA, 94720, USA

    T. J. M. Symons, G. F. Krebs & J. R. Alonso

  5. CIAE, Beijing, 102413, P.R. China

    S. Y. Zhu, J. Z. Zhu & Y. J. Xu

Authors
  1. T. Nagatomo
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  2. K. Matsuta
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  3. K. Hashimoto
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  4. M. Ota
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  5. K. Arimura
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  6. K. Minamisono
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  7. T. Sumikama
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  8. M. Ogura
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  9. T. Iwakoshi
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  10. T. Miyake
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  11. S. Kudo
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  12. K. Akutsu
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  13. T. Minamisono
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  14. M. Fukuda
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  15. M. Mihara
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  16. S. Momota
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  17. Y. Nojiri
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  18. A. Kitagawa
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  19. M. Torikoshi
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  20. M. Kanazawa
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  21. M. Suda
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  22. M. Hirai
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  23. T. J. M. Symons
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  24. G. F. Krebs
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  25. J. R. Alonso
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  26. S. Y. Zhu
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  27. J. Z. Zhu
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  28. Y. J. Xu
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Nagatomo, T., Matsuta, K., Hashimoto, K. et al. Nuclear Spin Alignment of 12,13B Produced in Heavy Ion Collisions. Hyperfine Interactions 136, 233–237 (2001). https://doi.org/10.1023/A:1020554331850

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  • DOI: https://doi.org/10.1023/A:1020554331850

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