Clustering Features of the 7Be Nucleus in Relativistic Fragmentation

Abstract

Charge topology of fragmentation of 1.2 A GeV 7 Be nuclei in nuclear track emulsion is presented.The dissociation channels 4 He + 3 He, 2 3 He+ n, 4 He + 2 1 H are considered in detail. It is established that the events 6 Be + n amount about to 27 % in the channel 4 He + 2 1 H.

Unstable nuclei in dissociation of light stable and radioactive nuclei in nuclear track emulsion

“…Contribution of the unstable nuclei 6 Be, 8 Be and 9 B into dissociation of relativistic nuclei 7,9 Be, 10 B and 10,11 C is under study on the basis of the nuclear track emulsion exposed to secondary beams of the JINR Nuclotron.…”

“…This way, the idea about simultaneous coexistence in 10 B of superposition of cores 8 Be g.s. , 8 Be 2 + and 9 B obtain a ground.…”

“…Consideration of the nucleosynthesis chains toward 10,11 B, 10,11 C and 12 N via the "hot breakout" 7 Be( 3 He,γ) 10 C(e + ,ν) 10 B assists to recognize relations between their structures and, in particular, importance of the unbound nuclei in them. The 10 C synthesis processing due to an increase of α-clustering provides an energy "window" for the formation of intermediate states with unstable nuclei 9 B + p, 8 Be 2 + + 2p and 6 Be + α. These clusters are preserved in subsequent reactions 10 C(e + ,ν) 10 B(p,γ) 11 C(e + ,ν) 11 B.…”

“…In particular, the cluster configuration involving the deuteron pattern 10 B dissociation via decays 8 Be g.s. , 8 Be 2 + and 9 B can be disentangled step by step.…”

“…As "building blocks" the light nuclei include the lightest clusters having no excited states, namely, α-particles, tritons, 3 He nuclei, and deuterons, and nucleons which virtual associations coexist in dynamical equilibrium. A pair of α-particles can constitute the unstable 8 Be nucleus in the ground 8 Be g.s. or 1st exited 8 Be 2 + states.…”