Neutron-Deficient Nuclides of Hafnium and Lutetium

Erich R. Merz and Albert A. Caretto, Jr.
Phys. Rev. 122, 1558 – Published 1 June 1961
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Abstract

New neutron-deficient nuclides of lutetium and hafnium were produced by bombarding lutetium oxide with 300- to 400-Mev protons. The genetic relationships and mass assignments were established by means of high-purity chemical separations and a series of chemical isolation experiments in which the daughter activity was determined as a function of time.

The positron spectra of the different nuclides were measured with an anthracene crystal detector and a 256-channel pulse height analyzer. Gamma radiation was also observed for Lu168, Lu169, Lu170, Hf168, and Hf169 by means of a NaI crystal detector and the pulse height analyzer. The half-lives and maximum positron energies observed are: Lu168, T12=7.0 min, Eβ+=(1.20±0.05) Mev; Lu169, T12=1.5 days; Lu170, T12=1.9 days, Eβ+=(1.8±0.1) Mev; Hf168, T12=22 min, Eβ+=(1.7±0.1) Mev; Hf169, T12=1.5 hr; Hf170, T12=9 hr.

  • Received 23 January 1961

DOI:https://doi.org/10.1103/PhysRev.122.1558

©1961 American Physical Society

Authors & Affiliations

Erich R. Merz* and Albert A. Caretto, Jr.

  • Department of Chemistry, Carnegie Institute of Technology, Pittsburgh, Pennsylvania

  • *Present address: Max Planck Institut, Mainz, Germany.

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Issue

Vol. 122, Iss. 5 — June 1961

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