The charge resolution ofCR39

The charge resolution of the INTERCAST CR39 was determined using samples exposed to sulphur ions of 200 GeV/nucleon [1]. The results are shown in the 'Charge Resolution' figure. For ions with charge in the range 6 < Z < 16 the charge resolution is 0.05e (e=unit electric charge) for Z=7 and 0.07e for Z=13. The slight worsening of the charge resolution with the increasing Z is due to the non linear increase of the etch-pit areas with increasing charge.

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REFERENCES
[1] S. Cecchini et al., Fragmentation cross sections and search for nuclear fragments with fractional charge in relativistic heavy ion collisions, Astroparticle Phys. 1 (1993) 369.

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