$\alpha$ decay of ${^{243}\mathrm{Fm}}_{143}$ and ${^{245}\mathrm{Fm}}_{145}$, and of their daughter nuclei
Physical Review C(2020)
摘要
Nuclear structure of Fm243, Fm245, and their daughter nuclei were investigated via detection of their radioactive decays, α, γ, and spontaneous fission. Measured α-decay energies, half-lives, and branching ratios improve the literature data significantly. A signature for detection of the hitherto unknown Cm235 was found in the α-decay chains from Fm243. Two groups of α events with average energies of 6.69(2) MeV and 7.01(2) MeV and with a half-life of T1/2=300−100+250 s are suggested to originate from Cm235. Tentative decay schemes for Fm243, Cf239, Cm235, and Fm245, Cf241 isotopes are suggested based on the present experimental data. Systematical trends of single-particle states in N=141 isotones of Z=92–98 nuclei are discussed.
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