Abstract
Eight 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. For six of these, each half-life was determined: 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 observed half-lives were compared with theoretical calculations. The recent calculation by the gross theory with the new one-particle strength function shows quite good agreement with the experimental half-lives.
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