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Synthesis of isotopes of fermium with mass numbers 247 and 246

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Abstract

The isotopes Fm247, Fm247m and Fm246 were synthesized in the extracted beam of the 310-cm heavy-ion cyclotron in the Joint Institute for Nuclear Research by irradiating Pu239 with C12 ions. ]he procedure of collecting the recoil atoms by means of gas jets is used, with subsequent recording of their ~- decay with Si(Au) detectors. For the isotope Fm247, α-activities are obtained with two different half-lives - one with two obviously complex groups of α-particles Eα=7.87±0.05MeV (∼70%) and EEα=7.93±0.05 MeV (∼30%), whose half- life is T1/2=35±4 sec; the other, with Eα=8.18±0.03 MeV has T1/2=9.2±2.3 sec. Data are confirmed concerning the properties of the isotope Fm246(Eα=8.25±0.03MeV and T1/2=1.6±0.4 sec), synthesized in 1966 at The Joint Institute for Nuclear Research.

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Authors
  1. G. N. Flerov
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  2. S. M. Polikanov
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  3. V. L. Mikheev
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  4. V. I. Ilyushchenko
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  5. M. B. Miller
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  6. V. A. Shchegolev
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Additional information

Translated from Atomnaya Énergiya, Vol. 22, No. 5, pp. 342–346, May, 1967.

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Flerov, G.N., Polikanov, S.M., Mikheev, V.L. et al. Synthesis of isotopes of fermium with mass numbers 247 and 246. At Energy 22, 434–437 (1967). https://doi.org/10.1007/BF01175203

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  • DOI: https://doi.org/10.1007/BF01175203

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