Beta Decay of 153Nd and Reflection Asymmetric Deformation in 153Pm.

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  • Taniguchi Akihiro
    Research Reactor Institute, Kyoto University, Kumatori–cho, Sennan–gun, Osaka 590–04
  • Ikuta Tomohiko
    School of Engineering, Nagoya University, Chikusa–ku, Nagoya 464–01
  • Osa Akihiko
    School of Engineering, Nagoya University, Chikusa–ku, Nagoya 464–01
  • Yamamoto Hiroshi
    School of Engineering, Nagoya University, Chikusa–ku, Nagoya 464–01
  • Kawade Kiyoshi
    School of Engineering, Nagoya University, Chikusa–ku, Nagoya 464–01
  • Ruan Jian–Zhi
    Faculty of Science, Rikkyo University, Nishiikebukuro, Toshima–ku, Tokyo 171
  • Yamada Shigeru
    Research Reactor Institute, Kyoto University, Kumatori–cho, Sennan–gun, Osaka 590–04
  • Kawase Yoichi
    Research Reactor Institute, Kyoto University, Kumatori–cho, Sennan–gun, Osaka 590–04
  • Okano Kotoyuki
    Research Reactor Institute, Kyoto University, Kumatori–cho, Sennan–gun, Osaka 590–04

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Other Title
  • Beta Decay of 153Nd and Reflection Asym
  • Beta Decay of<b><sup>153</sup><i>N</i><i>d</i></b>and Reflection Asymmetric Deformation in<b><sup>153</sup><i>P</i><i>m</i></b>

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Abstract

The level structure of 153Pm has been studied from the decay of 153Nd. The radioactivities of 153Nd were separated from the fission products of 235U using the upgraded KUR-ISOL. A precise decay scheme of 153Nd has been constructed up to 2, MeV and 115 γ -rays and 36 levels were involved in the decay scheme, in which 107 γ -rays and 28 levels were newly observed. The multipolarities and E2/M1 mixing ratios of 11 γ -transitions were deduced from the measurement of internal conversion electrons. From the results of the angular correlation measurements, the spin values of 450.5, 105.4 and 32.3, keV levels were deduced to be 3/2+, 7/2+ and 5/2+, respectively and the previous assignments were confirmed. The half-lives of 32.3 and 105.4, keV levels were determined to be 1.2(1), ns and 0.44(2), ns, respectively and the enhanced E1 transitions with B(E1)=10-3-- 10-4, W.u. were observed. The 153Pm level structure was compared with the result of a calculation with a rotation-vibration coupling model (RVCM) and it was found that 153Pm has a typical nuclear structure of the deformed nucleus. Moreover, the observation of enhanced E1 transitions between parity doublet bands indicates the possibility of the existence of the reflection asymmetric deformation in 153Pm.

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