A Cerenkov - Delta E/Delta X experiment for measuring cosmic-ray isotopes from neon through iron

Physics

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Cerenkov Counters, Cosmic Rays, Isotopes, Scintillation Counters, Balloon Flight, Balloon-Borne Instruments, Sodium Iodides

Scientific paper

Cosmic-ray isotope masses are measured in a balloon-borne cosmic-ray experiment. Two Cerenkov counters and an NaI scintillator stack are used to determine changes in energy and in the Lorentz factor for a traversing or stopping particle. The mass is defined at the ratio of the change in energy to the change in the Lorentz factor. For incident elements from neon through iron, mass resolution better than 0.3 a.m.u. is expected, with incident Lorentz gammas ranging from 2.4 to 3.1, depending on the element. The mass resolution is approximately 0.2 a.m.u., measured for Mn-55 ions having an incident Lorentz factor of 2.75.

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