Acoustic peak of protons in liquids

The excitation, of acoustic emission by a pulsed beam of protons with energy Ep = 70 MeV in methanol is investigated. Growth of the acoustic signal at the end of the proton trajectory is observed. The hydrodynamic characteristics of the acoustic emission are calculated on the assumption that the sources of elastic waves in the liquids are microcavities formed at the stopping sites of slow ionization electrons, i.e., so-called electrons.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 91–95, August, 1977.The authors wish to thank M. F. Lomanov and Ya. L. Kleinbok for assistance with the experiment.