Alpha decay of neutron-deficient francium isotopes

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Abstract

Isotopes of francium lighter than mass 214 were studied at the Heavy Ion Linear Accelerator by bombardment of 197Au with 16O and of 205Tl with 12C. Si(Au) surface-barrier detectors were used in on-line measurements to determine α-decay energies and half-lives. Mass number assignments of francium-213-203 were based on excitation functions and on genetic relationship with emanation and astatine isotopes. Isomerism was detected in 204Fr. Results are compared with previous work by Griffioen et al.

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This work was performed under the auspices of the U.S. Atomic Energy Commission.

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