Abstract.
The decay of the isotopes 255Rf, 251No and 247Fm produced in the reactions \(\mathrm{{}^{207}Pb\ensuremath({}^{50}Ti,2n){}^{255}Rf\ {}^{\alpha}_{\rightarrow}\ {}^{251}No\ \ensuremath{}^{\alpha}_{\rightarrow}\ {}^{247}Fm}\), and \(\mathrm{{}^{206}Pb\ensuremath({}^{48}Ca,3n){}^{251}No\ \ensuremath{}^{\alpha}_{\rightarrow}\ {}^{247}Fm}\) was investigated by means of α-γ spectroscopy. Previously observed γ transitions in coincidence with α decays of 255Rf were confirmed, their energies and line intensities were measured more precisely, and their multipolarities were determined as E1. In 251No a new isomeric state at E * > 1700keV with a half-life of ≈ 2μs was identified. The decay of 247Fm was measured more precisely. A partial level scheme of the daughter nucleus 243Cf could be established.
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Heßberger, F.P., Hofmann, S., Ackermann, D. et al. Alpha-gamma decay studies of 255Rf, 251No and 247Fm. Eur. Phys. J. A 30, 561–569 (2006). https://doi.org/10.1140/epja/i2006-10137-2
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DOI: https://doi.org/10.1140/epja/i2006-10137-2