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We consider the hypothesis that cosmic rays are emitted from the surfaces ofneutron stars by a process of evaporation from an internal nuclear liquid to adilute external gas which constitutes the "vacuum". On this basis, we find aninverse power in the energy distribution with a power law exponent of 2.701178in excellent agreement with the experimental value of 2.7. The heat of nuclearmatter evaporation via the entropy allows for the computation of the exponent.The evaporation model employed is based on the entropy considerations of Landauand Fermi that have been applied to the liquid drop model of evaporation in aheavy nucleus excited by a collision. This model provides a new means ofobtaining power law distributions for cosmic ray energy distributions and,remarkably, an actual value for the exponent which is in agreement withexperiment and explains the otherwise puzzling smoothness of the cosmic rayenergy distribution over a wide range of energies without discontinuities dueto contributions from different sources required by current models.

Entropy and the Cosmic Ray Particle Energy Distribution Power Law Exponent