Abstract
New neutron-rich lanthanide isotopes produced in the proton-induced fission of 238U have been identified using the JAERI on-line isotope separator (JAERI-ISOL) coupled to a gas-jet transport system. The observed K x-rays following the β−-decay of products in the mass separated fraction provided direct isotopic identifications. New isotopes observed, with values of their half-lives given in parentheses, are 159Pm(2±1 s), 161Sm(4.8±0.8 s), 165Gd(10.3±1.6 s), 166Tb(21±6 s), 167Tb(19.4±2.7 s) and 168Tb(8.2±1.3 s). The half-life values are compared to the results of theoretical predictions.
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