Abstract
A new neutron-rich isotope 166 Tb produced in 16 MeV proton-induced fission of 238 U has been identified using the JAERI on-line isotope separator (JAERI-ISOL) coupled to a gas-jet transport system. Dy KX-rays and γ rays originating from the decay of 166 Tb were found in both mass-166 and 182 fractions, where the 166 Tb nuclides were mass-separated as elemental ions 166 Tb + and monoxide ions 166 TbO + , respectively. The half-life of 166 Tb has been determined as 21±6 s, which is much shorter than theoretical predictions. A decay scheme of 166 Tb has been proposed and a probable spin assignment for the 166 Tb ground state has been discussed.
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