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Isomeric yield ratios of fission products in the system of 24 MeV proton-induced fission of238U

  • Nuclear Structure and Reactions
  • Published:
Zeitschrift für Physik A Hadrons and Nuclei

Abstract

Isomeric yield ratios of 30 fission products in 24 MeV proton-induced fission of238U were measured by the use of the ion-guide isotope separator on-line. The obtained isomeric yield ratios were converted to the angular momenta of primary fission fragments based on the statistical model. The deduced angular momenta were examined from various aspects. It is found that in general the angular momentum continuously increases with the fragment mass number including the region of symmetric mass division. However, there are some exceptions. For Sn isotopes the deduced angular momenta are quite small due to the spherical shape of the nuclear shell configuration. It is also concluded from the consideration of the charge distribution that the angular momentum of fission product scatters considerably within the narrow range of mass division. The dependence of the angular momentum on the available energy of fragments at scission point indicates that the individual fragment possesses a characteristic deformation at scission and/or the deduced angular momentum is seriously affected by the particle excitation after scission.

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Author notes

  1. M. Tanikawa

    Present address: Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Tokyo, Japan

  2. M. Wada

    Present address: Nuclear Physics Division, the Institute for Nuclear Study, University of Tokyo, Tokyo, Japan

Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Niigata University, Niigata, Japan

    M. Tanikawa & H. Kudo

  2. Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan

    H. Sunaoshi, M. Wada, T. Shinozuka & M. Fujioka

Authors
  1. M. Tanikawa
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  2. H. Kudo
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  3. H. Sunaoshi
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  4. M. Wada
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  5. T. Shinozuka
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  6. M. Fujioka
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Additional information

The authors wish to thank Mr. H. Ikegami, Mr. Y. Fukashiro, and Mr. M. Maruyama for their cooperation in part of this work. The authors would like to express their appreciation to the crew of Cyclotron and Radioisotope Center of Tohoku University for nice operation of the cyclotron.

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Tanikawa, M., Kudo, H., Sunaoshi, H. et al. Isomeric yield ratios of fission products in the system of 24 MeV proton-induced fission of238U. Z. Physik A - Hadrons and Nuclei 347, 53–62 (1993). https://doi.org/10.1007/BF01301277

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  • DOI: https://doi.org/10.1007/BF01301277

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