Abstract
Ultrasonic quantum oscillations have been studied in lead single crystals using 70-110 MHz longitudinal waves at about 1.3K in magnetic fields up to over 7 T. The results are interpreted in terms of the Fermi surface; they confirm the presently accepted third-zone surface and they show the presence of electron pockets in the fourth zone, previously believed to be empty. The fourth-zone occupancy is shown to be about 4*10-3 electrons per atom.
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