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

  • M. Asai
  • M. Sakama
  • K. Tsukada
  • S. Ichikawa
  • H. Haba
  • I. Nishinaka
  • Y. Nagame
  • S. Goto
  • Y. Kojima
  • Y. Oura
  • H. Nakahara
  • M. Shibata
  • K. Kawade
Article

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.

PACS.

23.20.Lv γ transitions and level energies 23.40.-s β decay; double β decay; electron and muon capture 27.90.+b 220 ⩽ A 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2004

Authors and Affiliations

  • M. Asai
    • 1
  • M. Sakama
    • 2
  • K. Tsukada
    • 1
  • S. Ichikawa
    • 1
  • H. Haba
    • 3
  • I. Nishinaka
    • 1
  • Y. Nagame
    • 1
  • S. Goto
    • 4
  • Y. Kojima
    • 5
  • Y. Oura
    • 6
  • H. Nakahara
    • 6
  • M. Shibata
    • 7
  • K. Kawade
    • 7
  1. 1.Advanced Science Research CenterJapan Atomic Energy Research InstituteTokaiJapan
  2. 2.Department of Radiologic Science and EngineeringThe University of TokushimaTokushimaJapan
  3. 3.Cyclotron CenterThe Institute of Physical and Chemical Research (RIKEN)WakoJapan
  4. 4.Department of ChemistryNiigata UniversityNiigataJapan
  5. 5.Graduate School of EngineeringHiroshima UniversityHigashi-HiroshimaJapan
  6. 6.Department of ChemistryTokyo Metropolitan UniversityHachiojiJapan
  7. 7.Department of Energy Engineering and ScienceNagoya UniversityNagoyaJapan

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