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

Abstract

A role of the unstable nuclei ${}^6$Be, ${}^8$Be and ${}^9$B in the dissociation of relativistic nuclei ${}^{7,9}$Be, ${}^{10}$B and ${}^{10,11}$C is under study on the basis of nuclear track emulsion exposed to secondary beams of the JINR Nuclotron. Contribution of the configuration ${}^6$Be + $\mit{n}$ to the ${}^7$Be nucleus structure is 8 $\pm$ 1% which is near the value for the configuration ${}^6$Li + $\mit{p}$. Distributions over the opening angle of $\alpha$-particle pairs indicate to a simultaneous presence of virtual ${}^8$Be${}_{g.s.}$ and ${}^8$Be${}_{2^{+}}$ states in the ground states of the ${}^9$Be and ${}^{10}$C nuclei. The core ${}^9$B is manifested in the {${}^{10}$C} nucleus with a probability of 30 $\pm$ 4%. Selection of the ${}^{10}$C "white" stars accompanied by ${}^8$Be${}_{g.s.}$ (${}^9$B) leads to appearance in the excitation energy distribution of 2$\alpha$2$\mit{p}$ "quartets" of the distinct peak with a maximum at 4.1 $\pm$ 0.3 MeV. ${}^8$Be${}_{g.s.}$ decays are presented in 24 $\pm$ 7% of 2He + 2H events of the ${}^{11}$C coherent dissociation and 27 $\pm$ 11% of the 3He ones. The channel ${}^9$B + H amounts 14 $\pm$ 3%. The ${}^8$Be${}_{g.s.}$ nucleus is manifested in the coherent dissociation ${}^{10}$B $\to$ 2He + H with a probability of 25 $\pm$ 5% including 14 $\pm$ 3% of ${}^9$B decays. A probability ratio of the mirror channels ${}^9$B + $\mit{n}$ and ${}^9$Be + $\mit{p}$ is estimated to be 6 $\pm$ 1.

To be published in Physics of Particles in Nuclei (in press)

References in corpus (3)

• Coherent Dissociation of Relativistic C-9 Nuclei
• Clustering features of the ${}^7$Be nucleus in relativistic fragmentation
• ${}^8$He nuclei stopped in nuclear track emulsion

Cited by in corpus (2)

• Nuclear track emulsion in search for the Hoyle-state in dissociation of relativistic ${}^{12}$C nuclei
• Prospects of nuclear clustering studies via dissociation of relativistic nuclei in nuclear track emulsion