The charge topology in the fragmentation of 10 C nuclei in a track nuclear emulsion at an energy of 1.2 GeV per nucleon is studied. In the coherent dissociation of 10 C nuclei, about 82% of events are associated with the channel 10 C → 2α+ 2p. The angular distributions and correlations of product fragments are presented for this channel. It is found that among 10 C → 2α+ 2p events, about 30% are associated with the process in which dissociation through the ground state of the unstable 9 Beg.s. nucleus is followed by 8 Beg.s.+ p decays.

The dissociation of relativistic 12 N nuclei having a momentum of 2 GeV/c per nucleon and undergoing the most peripheral interactions in a track emulsion is studied. The picture of charged topology of product ensembles of relativistic fragments and special features of their angular distributions are presented. DOI: 10.1134/S1063778813100074The track-emulsion method has still retained its exceptional position as a means for studying the structure of fragmentation of relativistic nuclei owing to the completeness of observation of fragment ensembles and owing to its record spatial resolution. The objective of employing a track emulsion in the Becquerel project [1] at the nuclotron of the Joint Institute for Nuclear Research (JINR, Dubna) is to study the clustering of nucleons for a wide variety of light nuclei, including radioactive ones. An analysis proves to be the most comprehensive for coherent-dissociation events, in which target fragments or mesons are not produced [2] and which, for the sake of brevity, are referred to as white stars. Since the perturbation is minimal in interactions of this type, a configuration overlap of the ground states of the nuclei being studied and the observed ensembles of fragments and nucleons manifests itself. On this basis, there arise possibilities for some kind of a tomography of the nuclear structure. The distribution of white stars with respect to the probability for the formation of various configurations shows a correlation with weights of respective cluster components of the nuclei being studied. The discovery of the contribution from unexplored and even unexpected components of deeply bound cluster states is possible on this path. This is so especially for proton-rich light nuclei. The picture of nucleon clustering in events of the coherent dissociation of the 12 N radioactive nucleus, which has yet to receive adequate study, on track-emulsion nuclei is the

Results on the coherent dissociation of relativistic 9 C nuclei in a nuclear track emulsion are described. These results include the charge topology and kinematical features of final states.Events of 9 C→ 3 3 He coherent dissociation are identified.

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