6533b839fe1ef96bd12a58ba

RESEARCH PRODUCT

The decay of 0.57 s114Cs

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Fusion reactions between58Ni projectiles and58Ni target nuclei were used to produce114Cs activity, which was studied by on-line mass separation and decay spectroscopy. The obtained half-life of 0.57±0.02 s and the probability ratio of 44±3 between betadelayed proton and beta-delayed alpha emission represent data with improved precision. The absolute branching ratios for both particle decay modes were determined to be (7 ±2)×10−2 and (1.6±0.6)×10−3, respectively. These branching ratios and the shapes of particle spectra are discussed with reference to the statistical model calculations. Groundstate alpha decay of114Cs was observed with an alpha energy of 3,226±30 keV and a branching ratio of (1.8±0.6)×10−4. An upper limit of the branching ratio for a possible ground-state proton decay was set at 5×10−4. Fromγ-ray singles andγ-γ coincidence measurements, excited states in114Xe are proposed.