β-decay half-lives of new neutron-rich isotopes 167,168Tb and levels in 167,168Dy

M. Asai, S. Ichikawa, K. Tsukada, M. Sakama, M. Shibata, Y. Kojima, A. Osa, I. Nishinaka, Y. Nagame, K. Kawade, and T. Tachibana
Phys. Rev. C 59, 3060 – Published 1 June 1999
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Abstract

β-decay half-lives of new neutron-rich isotopes 167Tb and 168Tb produced in the 20 MeV proton-induced fission of 238U have been determined to be 19.4(27) s and 8.2(13) s, respectively, using a gas-jet coupled on-line isotope separator. The present half-lives and those of the recently identified nuclei 159Pm, 161Sm, 165Gd, 166Tb were compared with theoretical predictions. The recent calculation by the gross theory with the new one-particle strength functions shows quite good agreement with the experimental half-lives. Excited states of the daughter nuclides 167Dy and 168Dy have been established for the first time. Level energies of the first 2+ states in even-even Dy isotopes were found to show an irregular behavior at 164Dy and increasing deformation toward the neutron midshell around N104.

  • Received 19 January 1999

DOI:https://doi.org/10.1103/PhysRevC.59.3060

©1999 American Physical Society

Authors & Affiliations

M. Asai1,*, S. Ichikawa1, K. Tsukada1, M. Sakama2, M. Shibata3, Y. Kojima3, A. Osa4, I. Nishinaka1, Y. Nagame1, K. Kawade3, and T. Tachibana5

  • 1Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
  • 2Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0364, Japan
  • 3Department of Energy Engineering and Science, Nagoya University, Chikusa, Nagoya, 464-8603, Japan
  • 4Department of Materials Science, Japan Atomic Energy Research Institute, Takasaki, Gunma 370-1292, Japan
  • 5Advanced Research Institute for Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan

  • *Electronic address: asai@tdmalph1.tokai.jaeri.go.jp

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Vol. 59, Iss. 6 — June 1999

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