The Hoyle State in the Relativistic Dissociation of Light Nuclei

Abstract

In the context of the search for triples of relativistic α-particles in the Hoyle state, the analysis of available data on the dissociation of the nuclei 12 C, 16 O and 22 Ne in the nuclear emulsion was carried out. The Hoyle state is identified by the invariant mass calculated from pair angles of expansion in α-triples in the approximation of the conservation of the momentum per nucleon of the parent nucleus. The contribution of the Hoyle state to the dissociation of 12 C → 3α is 11%. In the case of the coherent dissociation of 16 O → 4α it reaches 22% when the portion of the channel 16 O → 2 8 Be is equal to 5%. PACS numbers: 21.60.Gx, 25.75.-q, 29.40.Rg

Application of Nuclear Track Emulsion in Search for the Hoyle State in Dissociation of Relativistic 12C Nuclei

“…This data set includes precision measurements of the emission angles of relativistic from 2 to 5α particles, which allowed one to analyse variables. It has been found that the probability of identifying the 8 Be, 9 B and HS states grows with the multiplicity of α particles in the event [15]. A similar result was obtained by analysing 1093 events of nα fragmentation of 28 Si nuclei with the energy of 14.6 GeV/nucleon in NTE up to 6α particles in the event [14].…”

“…Starting with the fragmentation of 16 O nuclei in the energy range from the 3.65 to 200 GeV/nucleon, the analysis has shown a relative increase in the contribution of 8 Be nuclei with the growing number of relativistic α particles per event [14]. The results of measurements of 4301 interactions of 22 Ne nuclei at the energy of 3.22 A GeV were analyzed in [15]. This data set includes precision measurements of the emission angles of relativistic from 2 to 5α particles, which allowed one to analyse variables.…”