Identification of the slow E3 transition 136mCs -> 136Cs with conversion   electrons
  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. 
K. Wimmer, U. Koester, P. Hoff, Th. Kroell, R. Kruecken, R. Lutter, H.   Mach, Th. Morgan, S. Sarkar, M. Saha Sarkar, W. Sch...
nucl-ex nucl-th