  In this paper we note that the spectral intensities of antiprotons observed
in Galactic cosmic rays in the energy range ~ 1-100 GeV by BESS, PAMELA and AMS
instruments display nearly the same spectral shape as that generated by primary
cosmic rays through their interaction with matter in the interstellar medium,
without any significant modifications. More importantly, a constant residence
time of ~ 2.5 +/-0.7 million years in the Galactic volume, independent of the
energy of cosmic rays, matches the observed intensities. A small additional
component of secondary antiprotons in the energy below 10 GeV, generated in
cocoon-like regions surrounding the cosmic-ray sources, seems to be present. We
discuss this result in the context of observations of other secondary
components like positrons and Boron, and conclude with general remarks about
the origins and propagation of cosmic rays.
