alpha decay of (243)Fm(143 )and Fm-245(145), and of their daughter nuclei

Nuclear structure of Fm-243, Fm-245,and their daughter nuclei were investigated via detection of their radioactive decays, alpha, gamma, and spontaneous fission. Measured alpha-decay energies, half-lives, and branching ratios improve the literature data significantly. A signature for detection of the hitherto unknown Cm-235 was found in the alpha-decay chains from Fm-243. Two groups of alpha events with average energies of 6.69(2) MeV and 7.01(2) MeV and with a half-life of T-1/2 = 300(-100)(+250) s are suggested to originate from 235 Cm. Tentative decay schemes for Fm-243, Cf-239, Cm-235, and Fm-245, Cf-241 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.