Abstract
We study phenomenologically the inclusive fragmentation cross section data of /sup 12/C and /sup 16/O at 2.1 GeV/nucleon, and /sup 56/Fe at 1.88 GeV/nucleon upon collisions with a /sup 12/C target. The main assumptions on the fragmentation mechanism are the diffractive excitation of the high energy beam nucleus into the state of virtual dissociation and its direct decay into two fragments as was previously proposed by the authors. Starting from Izosimova et al.'s formula for the same problem, we derive a phenomenological inclusive cross section formula for fragment production, which is applicable to both ordinary and very light fragments. We find that the data can be understood if we assume that the fragments are being produced not only in their ground states but also in the low lying excited states. Our formula relates the inclusive cross section of light fragment (cluster) to the effective number of the same cluster in the low lying excited states of the beam nucleus.
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