arXiv:1106.6240·v1·Nuclear Experiment
Identification of the slow E3 transition 136mCs -> 136Cs with conversion electrons
K. Wimmer🇩🇪 · U. Koester🇫🇷 · P. Hoff🇳🇴 · Th. Kroell🇩🇪 · R. Kruecken🇩🇪 · R. Lutter🇩🇪 · H. Mach🇸🇪 · Th. Morgan🇩🇪 · S. Sarkar🇮🇳 · M. Saha Sarkar🇺🇸 · W. Schwerdtfeger🇩🇪 · P. C. Srivastava🇫🇷 · P. G. Thirolf🇩🇪 · P. Van Isacker🇫🇷
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.
Comments: Phys. Rev. C accepted for publication