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DOI: 10.1134/S106377881809020X 7 P. Physics of Atomic Nuclei, 2018, Vol. 81, No. 9, pp. 1237–1243 Keywords: nuclear emulsion, dissociation, invariant mass, relativistic fragments, 12C nucleus, Hoyle’s state, alpha particles In dissociation in nuclear track emulsion of  and  GeV/c  nuclei, the formation of triplets
of  particles in the Hoyle state (the second excited state  )
is observed. This state is identified by the invariant
mass, calculated from pair angles in the triples in approximation of conservation of momentum per
nucleon of the parent nucleus. An estimate of the contribution of the Hoyle state to the dissociation of 
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