Abstract
Five isotopes of mendelevium, with mass numbers 248 through 252, were studied by means of -particle spectroscopy. The isotopes were produced by bombarding and targets with and ions accelerated by the Berkeley heavy-ion linear accelerator. The half-lives of the nuclides and the energies of the main -particle groups, respectively, were observed to be: : 7 ± 3 sec, 8.32 ± 0.02 MeV; : 24 ± 4 sec, 8.03 ± 0.02 MeV; : 52 ± 6 sec, 7.75 ± 0.02 MeV; : 4.0 ± 0.5 min, 7.55 ± 0.02 MeV; : 2.3 ± 0.8 min, no decay. The -particle energies of , , and , produced mainly by () reactions, were measured to be 7.73 ± 0.02, 7.36 ± 0.03, and 7.31 ± 0.03 MeV, respectively, and the half-life of was found to be 4.7±0.3 min. Excitation curves for producing the Md isotopes and some other activities are presented. Estimates for the electron-capture branching of the Md isotopes are given. -decay hindrance factors were calculated using the spin-independent equations of Preston. The -decay energy systematics of the mendelevium isotopes is discussed.
- Received 9 June 1972
DOI:https://doi.org/10.1103/PhysRevC.7.280
©1973 American Physical Society