Abstract
Two new neutron-rich rare-earth isotopes and produced in the proton-induced fission of were identified using the JAERI on-line isotope separator (JAERI-ISOL) coupled to a gas-jet transport system. The half-lives were determined to be 4.8±0.8 s for and 10.3±1.6 s for The assignment of these isotopes was based upon the observation of Eu and Tb K x rays in the -gated x/-ray spectra measured for the separated mass fraction 177 and 181 as monoxide ions and respectively.
- Received 17 March 1998
DOI:https://doi.org/10.1103/PhysRevC.58.1329
©1998 American Physical Society