Coherent Dissociation $^{16}$O~$\rightarrow$~4$\alpha$ in Photoemulsion   at an Incident Momentum of 4.5 GeV/$c$ per Nucleon
  First searches for the coherent dissociation of relativistic oxygen nuclei into four a particles are reported. It is shown that reactions of this type are characterized by a significantly lower decay temperature than the conventional multifragmentation of residual projectile nuclei. The momentum spectra and correlations of a panicles are not reproduced by the simple statistical model of direct fragmentation. The possibility that the oxygen nucleus undergoing fragmentation acquires a nonzero angular momentum in the collision process is discussed. 
N. P. Andreeva, Z. V. Anzon, V. I. Bubnov, A. Sh. Gaitinov, G. Zh.   Eligbaeva, L. E. Eremenko, G. S. Kalyachkina, E. K. Kan...
nucl-ex