New radioactive isotopes of the rare earth elements

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Abstract

Three new radioisotopes have been made by spallation reactions in rare earth targets: 167Lu, half-life 54 min, 161Tm, 32 min, and 163Tm, 2·0 hr, all decaying by electron capture.

A previously known ytterbium isotope of uncertain mass number has been assigned to 164Yb, with a half-life of 85 min. A new radioactive terbium isotope decaying by K electron capture with a half-life greater than three years has been tentatively assigned to 158Tb.

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