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

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

2011-06-30

arxiv.org/abs/1106.6240v1

Phys.Rev.C84:014329,2011; Publisher-note C84:029903,2011; Phys.Rev.C84:029903,2011

Physics

Nuclear Physics

Nuclear Experiment

Phys. Rev. C accepted for publication

Scientific paper

10.1103/PhysRevC.84.014329 10.11

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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