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Identification of the new isotope 241Bk

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Abstract:

A new neutron-deficient berkelium isotope 241Bk produced in the 239Pu(6Li, 4n) reaction has been identified using a gas-jet coupled on-line isotope separator. Cm K and L X-rays associated with the EC decay of 241Bk were observed in the mass-241 fraction, and three γ transitions were attributed to the EC decay of 241Bk through X-γ coincidences. The half-life of 241Bk was determined to be 4.6±0.4 min which is 1/2-1/4 of that of theoretical predictions. The half-life value and the observed γ transitions can be consistently explained as a consequence of the allowed EC transition of π7/2+[633] → ν7/2+[624].

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Authors and Affiliations

  1. Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan, , , , , , JP

    M. Asai, K. Tsukada, S. Ichikawa, Y. Nagame, I. Nishinaka, K. Akiyama, A. Toyoshima & T. Kaneko

  2. Department of Radiologic Science and Engineering, University of Tokushima, Tokushima 770-8509, Japan, , , , , , JP

    M. Sakama

  3. Radioisotope Technology Division, Cyclotron Center, RIKEN, Wako, Saitama 351-0198, Japan, , , , , , JP

    H. Haba

  4. Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan, , , , , , JP

    Y. Oura

  5. Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan, , , , , , JP

    Y. Kojima

  6. Facility for Nuclear Materials, Nagoya University, Nagoya 464-8603, Japan, , , , , , JP

    M. Shibata

Authors
  1. M. Asai
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  2. K. Tsukada
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  3. S. Ichikawa
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  4. M. Sakama
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  5. H. Haba
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  6. Y. Nagame
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  7. I. Nishinaka
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  8. K. Akiyama
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  9. A. Toyoshima
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  10. T. Kaneko
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  11. Y. Oura
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  12. Y. Kojima
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  13. M. Shibata
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Additional information

Received: 14 October 2002 / Accepted: 6 November 2002 / Published online: 17 January 2003

RID="a"

ID="a"e-mail: asai@tandem.tokai.jaeri.go.jp

Communicated by J. Äystö

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Asai, M., Tsukada, K., Ichikawa, S. et al. Identification of the new isotope 241Bk. Eur Phys J A 16, 17–19 (2003). https://doi.org/10.1140/epja/i2002-10112-y

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  • DOI: https://doi.org/10.1140/epja/i2002-10112-y

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