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Proton-neutron configurations in 236g, mAm and its EC-decay daughter 236Pu

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Abstract.

The EC decay of 236Am has been studied using a gas-jet coupled on-line isotope separator. A half-life analysis revealed that there are two EC-decaying states in 236Am: the 5- state with T1/2 = 3.6(2) min and the (1-) state with T1/2 = 2.9(2) min. The 1185.5 keV level in 236Pu was found to be the K isomer with Kπ = 5- and t1/2 = 1.2(3) μs. EC transitions from 236g, mAm to the 1185.5, 1311.5, and 1340.8 keV levels in 236Pu show small log ft values of 4.9, 5.3, and 4.8, respectively, indicating that the π5/2+[642] → ν5/2+[633] transition largely contributes to these transitions, and thus, the populated levels should be the π5/2-[523]π5/2+[642] two-quasiparticle states. The Kπ = 0- octupole band established in 236Pu is located at higher energy than those in 238,240Pu, which implies that the octupole correlations become weak at 236Pu.

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Authors and Affiliations

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

    M. Asai, K. Tsukada, S. Ichikawa, I. Nishinaka & Y. Nagame

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

    M. Sakama

  3. Cyclotron Center, The Institute of Physical and Chemical Research (RIKEN), 351-0198, Wako, Japan

    H. Haba

  4. Department of Chemistry, Niigata University, 950-2181, Niigata, Japan

    S. Goto

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

    Y. Kojima

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

    Y. Oura & H. Nakahara

  7. Department of Energy Engineering and Science, Nagoya University, 464-8603, Nagoya, Japan

    M. Shibata & K. Kawade

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  1. M. Asai
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  2. M. Sakama
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  4. S. Ichikawa
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  8. S. Goto
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  9. Y. Kojima
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Correspondence to M. Asai.

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Asai, M., Sakama, M., Tsukada, K. et al. Proton-neutron configurations in 236g, mAm and its EC-decay daughter 236Pu. Eur. Phys. J. A 23, 395–400 (2005). https://doi.org/10.1140/epja/i2004-10096-6

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  • DOI: https://doi.org/10.1140/epja/i2004-10096-6

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