Two New Alpha-Particle Emitting Isotopes of Element 105, Ha261 and Ha262

Albert Ghiorso, Matti Nurmia, Kari Eskola, and Pirkko Eskola
Phys. Rev. C 4, 1850 – Published 1 November 1971
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Abstract

Two new α-emitting isotopes of element 105 with mass numbers 261 and 262 have been discovered. The 8.93-MeV 1.8-sec Ha261 was produced by the reactions Cf250(N15,4n)Ha261 and Bk249(O16,4n)Ha261, and the 8.45-MeV 40-sec Ha262 by the reaction Bk249(O18,5n)Ha262. The isotopic assignments are based on both α-recoil milking and mother-daughter time-correlation measurements. An upper limit of 50% for branching by spontaneous fission was set for Ha261. A so far unassigned 25-sec spontaneous-fission activity was observed in the bombardment of Bk249 with O18 ions.

  • Received 26 May 1971

DOI:https://doi.org/10.1103/PhysRevC.4.1850

©1971 American Physical Society

Authors & Affiliations

Albert Ghiorso, Matti Nurmia, Kari Eskola*, and Pirkko Eskola

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

  • *On leave of absence from the University of Helsinki, Helsinki, Finland.

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Issue

Vol. 4, Iss. 5 — November 1971

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