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First searches for the coherent dissociation of relativistic oxygen nucleiinto four a particles are reported. It is shown that reactions of this type arecharacterized by a significantly lower decay temperature than the conventionalmultifragmentation of residual projectile nuclei. The momentum spectra andcorrelations of a panicles are not reproduced by the simple statistical modelof direct fragmentation. The possibility that the oxygen nucleus undergoingfragmentation acquires a nonzero angular momentum in the collision process isdiscussed.

Coherent Dissociation $^{16}$O~$\rightarrow$~4$\alpha$ in Photoemulsion at an Incident Momentum of 4.5 GeV/$c$ per Nucleon