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Identification of the slow E3 transition 136mCs -> 136Cs with conversion electrons

Abstract : We performed at ISOLDE the spectroscopy of the decay of the 8- isomer in 136Cs by and conversion-electron detection. For the first time the excitation energy of the isomer and the multipolarity of its decay have been measured. The half-life of the isomeric state was remeasured to T1/2 = 17.5(2) s. This isomer decays via a very slow 518 keV E3 transition to the ground state. In addition to this, a much weaker decay branch via a 413 keV M4 and a subsequent 105 keV E2 transition has been found. Thus we have found a new level at 105 keV with spin 4+ between the isomeric and the ground state. The results are discussed in comparison to shell model calculations.
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http://hal.in2p3.fr/in2p3-00611686
Contributor : Michel Lion <>
Submitted on : Wednesday, July 27, 2011 - 9:47:13 AM
Last modification on : Thursday, February 1, 2018 - 1:26:18 AM

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K. Wimmer, U. Koester, P. Hoff, Th. Kroell, R. Kruecken, et al.. Identification of the slow E3 transition 136mCs -> 136Cs with conversion electrons. Physical Review C, American Physical Society, 2011, 84, pp.014329. ⟨10.1103/PhysRevC.84.014329⟩. ⟨in2p3-00611686⟩

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