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Predictions and measurements of mass spectra of the charged nucleonic component of cosmic rays at mountain altitude

H. B. Barber, T. Bowen, D. A. Delise*, E. W. Jenkins, J. J. Jones, R. M. Kalbach†, and A. E. Pifer

  • Department of Physics, The University of Arizona, Tucson, Arizona 85721

  • *Present address: ADP Network Services, Inc., 120 Broadway, Suite 2225, New York, N.Y. 10005.
  • †Deceased.
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Phys. Rev. D 22, 2667 – Published 1 December, 1980

DOI: https://doi.org/10.1103/PhysRevD.22.2667

Abstract

A cosmic-ray mass spectrometer utilizing a superconducting magnet, digitized wire spark chambers, and time-of-flight scintillation counters has examined the mass spectrum of low-momentum charged particles at 2750-m altitude (747 g/cm2). For the first time at mountain altitude, the deuteron spectrum has been clearly resolved. The proton results confirm earlier work. The data indicate the presence of a few He4 nuclei. Upper limits are given to fluxes of antiproton and hypothetical massive particles in the 5-to-10-GeV/c2 range. The low-momentum deuteron spectrum, as well as the proton spectra at various atmospheric depths, can be well understood in terms of a cosmic-ray atmospheric cascade calculation. The deuterons are principally produced by N+N→d+π and quasielastic nucleon scattering on n−p pairs within the nucleus. Calculations are also presented of the expected intensities of low-momentum antiprotons and hypothetical massive particles at mountain altitude.

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Phys. Rev. D 22, 2667– Published 1 December, 1980
  • Received 13 June 1980

© 1980 American Physical Society

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