On-Line Alpha Spectroscopy of Neutron-Deficient Radium Isotopes

Kalevi Valli, William Treytl, and Earl K. Hyde
Phys. Rev. 161, 1284 – Published 20 September 1967
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Abstract

Isotopes of radium lighter than mass 215 were studied by bombardment of Pb206 with C12 and Au197 with F19. Si(Au) surface-barrier detectors were used in on-line measurements to measure α-decay characteristics. Mass-number assignments of Ra214 through Ra206 were made on the basis of excitation functions and genetic relationships with francium, emanation, and astatine isotopes. Half-lives and accurate α energies were determined for the radium isotopes, and the α energy of Fr214 was corrected. α and β branchings were measured for Ra213 and Ra214. Some systematic trends in the α-decay energies were interpreted in terms of weakening neutron and proton pairing energies near closed shells.

  • Received 28 April 1967

DOI:https://doi.org/10.1103/PhysRev.161.1284

©1967 American Physical Society

Authors & Affiliations

Kalevi Valli, William Treytl, and Earl K. Hyde

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

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Issue

Vol. 161, Iss. 4 — September 1967

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