Studies of Mendelevium Isotopes with Mass Numbers 248 Through 252

Pirkko Eskola
Phys. Rev. C 7, 280 – Published 1 January 1973
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Abstract

Five isotopes of mendelevium, with mass numbers 248 through 252, were studied by means of α-particle spectroscopy. The isotopes were produced by bombarding Am241 and Am243 targets with C12 and C13 ions accelerated by the Berkeley heavy-ion linear accelerator. The half-lives of the nuclides and the energies of the main α-particle groups, respectively, were observed to be: Md248: 7 ± 3 sec, 8.32 ± 0.02 MeV; Md249: 24 ± 4 sec, 8.03 ± 0.02 MeV; Md250: 52 ± 6 sec, 7.75 ± 0.02 MeV; Md251: 4.0 ± 0.5 min, 7.55 ± 0.02 MeV; Md252: 2.3 ± 0.8 min, no α decay. The α-particle energies of Es245, Es246, and Es247, produced mainly by (HI,αxn) 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 Es247 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. α-decay hindrance factors were calculated using the spin-independent equations of Preston. The α-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

Authors & Affiliations

Pirkko Eskola

  • Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

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Vol. 7, Iss. 1 — January 1973

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