This experimental research is a preparatory study to reflect the accuracy in identifying heavy fragmented nuclei in nuclear emulsion. The distributions of δ-rays produced by projectile fragments from 3.7A GeV 28Si in NIKFI-BR2 emulsion have been investigated. Such 28Si beam was accelerated at Dubna Synchrophastron. For sake of comparison, another source of data due to 14.6A GeV 28Si from Brookhaven National Laboratory (BNL), using different type of photographic emulsion (Fuji), is introduced. The charges of the produced projectile fragments having 2 ≤ Z ≤ 14 are deduced. This research may be important to carry out any subsequent investigation dealing with the mechanism of Si fragmentation at high energy, on the basis of the present identified charges.
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