Article

Identification of the slow E3 transition C-136(s)m -> Cs-136 with conversion electrons

ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
PHYSICAL REVIEW C 84. DOI:10.1103/PhysRevC.84.014329

ABSTRACT We performed at ISOLDE the spectroscopy of the decay of the 8(-) isomer in Cs-136 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 T-1/2 = 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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Keywords

conversion-electron detection
 
decay
 
ground state
 
ISOLDE
 
isomer
 
isomer decays
 
isomeric
 
isomeric state
 
new level
 
slow 518-keV E3 transition
 
spectroscopy
 
subsequent 105-keV E2 transition
 
weaker decay branch