Fragmentation channels of relativistic $^7$Be nuclei in peripheral interactions

N. G. Peresadko; V. G. Larionova; Yu. A. Aleksandrov; S. G. Gerasimov; V. A. Dronov; S. P. Kharlamov; V. N. Fetisov; V. Bradnova; S. Vokal; P. I. Zarubin; I. G. Zarubina; A. D. Kovalenko; A. I. Malakhov; P. A. Rukoyatkin; V. V. Rusakova

doi:10.1134/s1063778807070137

arXiv · nucl-ex/0605014

Fragmentation channels of relativistic $^7$Be nuclei in peripheral interactions

N. G. Peresadko·V. G. Larionova·Yu. A. Aleksandrov·S. G. Gerasimov·V. A. Dronov·S. P. Kharlamov·V. N. Fetisov·V. Bradnova·S. Vokal·P. I. Zarubin·I. G. Zarubina·A. D. Kovalenko·A. I. Malakhov·P. A. Rukoyatkin·V. V. Rusakova

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Abstract

Nuclei of $^7$Li were accelerated at the JINR Nuclotron. After the charge-exchange reaction involving these nuclei at an external target a second $^7$Be beam of energy 1.23A GeV was formed. This beam was used to expose photo-emulsion chambers. The mean free path for inelastic $^7$Be interactions in emulsion $λ$=14.0$\pm$0.8 cm coincides within the errors with those for $^6$Li and $^7$Li nuclei. More than 10% of the $^7$Be events are associated with the peripheral interactions in which the total charge of the relativistic fragments is equal to the charge of the $^7$Be and in which charged mesons are not produced. An unusual ratio of the isotopes is revealed in the composition of the doubly charged $^7$Be fragments: the number of $^3$He fragments is twice as large as that of $^4$He fragments. In 50% of peripheral interactions, a $^7$Be nucleus decays to two doubly charged fragments. The present paper gives the channels of the $^7$Be fragmentation to charged fragments. In 50% of events, the $^7$Be fragmentation proceeds only to charged fragments involving no emission of neutrons. Of them, the $^3$He+$^4$He channel dominates, the $^4$He+d+p and $^6$Li+pchannels constitute 10% each. Two events involving no emission of neutrons are registered in the 3-body $^3$He+t+p and $^3$He+d+d channels. The mean free path for the coherent dissociation of relativistic $^7$Be nuclei to $^3$He+$^4$He is 7$\pm$1 m. The particular features of the relativistic $^7$Be fragmentation in such peripheral interactions are explained by the $^3$He+$^4$He 2-cluster structure of the $^7$Be nucleus.

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N. G. Peresadko, V. G. Larionova, Yu. A. Aleksandrov, S. G. Gerasimov, V. A. Dronov, S. P. Kharlamov, V. N. Fetisov, V. Bradnova, S. Vokal, P. I. Zarubin, I. G. Zarubina, A. D. Kovalenko, A. I. Malakhov, P. A. Rukoyatkin, V. V. Rusakova. 2006-05-15. Fragmentation channels of relativistic $^7$Be nuclei in peripheral interactions. https://doi.org/10.1134/s1063778807070137

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