Isotopes of lawrencium
Open-knowledge reference entry
Lawrencium (103Lr) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 258Lr in 1961. There are fourteen known isotopes from 251Lr to 266Lr, except 263Lr and 265Lr, and seven isomers. The longest-lived known isotope is 266Lr with a half-life of 11 hours.
List of isotopes
Nucleosynthesis
Cold fusion
205Tl(50Ti,xn)255−xLr (x=2)
This reaction was studied in a series of experiments in 1976 by Yuri Oganessian and his team at the FLNR. Evidence was provided for the formation of 253Lr in the 2n exit channel. In 2022, two states (253Lr and 253mLr) were found.
203Tl(50Ti,xn)253−xLr (x=2)
This reaction was studied in a series of experiments in 1976 by Yuri Oganessian and his team at the FLNR. In 2022, two states (251Lr and 251mLr) were found.
208Pb(48Ti,pxn)255−xLr (x=1?)
This reaction was reported in 1984 by Yuri Oganessian at the FLNR. The team was able to detect decays of 246Cf, a descendant of 254Lr.
208Pb(45Sc,xn)253−xLr
This reaction was studied in a series of experiments in 1976 by Yuri Oganessian and his team at the FLNR. Results are not readily available.
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