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

Journal Article · Sun Jan 15 04:00:00 EST 2017 · Physics of Particles and Nuclei

DOI:https://doi.org/10.1134/S1063779617010026· OSTI ID:22979500

Artemenkov, D. A. ^[1]; Zaitsev, A. A.

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1. V.I. Veksler and A.M. Baldin Laboratory of High Energy Physics, Joint Institute for Nuclear Research, Dubna (Russian Federation)

A role of the unstable nuclei {sup 6}Be, {sup 8}Be and {sup 9}B in the dissociation of relativistic nuclei {sup 7,9}Be, {sup 10}B and {sup 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 {sup 6}Be + n to the {sup 7}Be nucleus structure is 8 ± 1% which is near the value for the configuration {sup 6}Li + p. Distributions over the opening angle of α-particle pairs indicate to a simultaneous presence of virtual {sup 8}Be{sub g.s}. and {sup 8}Be{sub 2+} states in the ground states of the {sup 9}Be and {sup 10}C nuclei. The core {sup 9}B is manifested in the {sup 10}C nucleus with a probability of 30 ± 4%. Selection of the {sup 10}C “white” stars accompanied by {sup 8}Be{sub g.s}. ({sup 9}B) leads to appearance in the excitation energy distribution of 2α2p “quartets” of the distinct peak with a maximum at 4.1 ± 0.3 MeV. {sup 8}Be{sub g.s}. decays are presented in 24 ± 7% of 2He + 2H events of the {sup 11}C coherent dissociation and 27 ± 11% of the 3He ones. The channel {sup 9}B + H amounts 14 ± 3%. The {sup 8}B{sub g.s}. nucleus is manifested in the coherent dissociation {sup 10}B → 2He + H with a probability of 25 ± 5% including 13 ± 3% of {sup 9}B decays. A probability ratio of the mirror channels {sup 9}B + n and {sup 9}Be + p is estimated to be 10 ± 1.

• OSTI ID: 22979500
• Journal Information: Physics of Particles and Nuclei, Journal Name: Physics of Particles and Nuclei Journal Issue: 1 Vol. 48; ISSN 1063-7796
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERYLLIUM 10
BERYLLIUM 6
BERYLLIUM 8
BERYLLIUM 9
BORON 10
BORON 9
CARBON 10
CARBON 11
DISSOCIATION
ELEMENTARY PARTICLES
EMULSIONS
ENERGY SPECTRA
GROUND STATES
HELIUM 3
JINR NUCLOTRON
PARTICLE TRACKS