Abstract
The spectra of the 11C and 10C nuclei from the 7Li(7Li, 11C)3n and 7Li(7Li, 10C)4n reactions, respectively, have been measured at a 7Li energy of 82 MeV and an angle of 2° up to excitation energies of 20–30 MeV of the desired multineutrons. The experiments were carried out with a magnetic separator, which made it possible to significantly increase the intensity of a beam by removing scattered particles and to carry out small-angle measurements. The energy spectra are well described by four-and five-particle phase spaces. No evidence has been found for the existence of nuclear stable and resonance states (with Γ < 3 MeV) of multineutrons. The upper limits have been obtained for the cross sections for the formation of nuclear stable states of 3n (1.4 nb/sr) and 4n (0.1 nb/sr) in the center-of-mass system.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 81, No. 2, 2005, pp. 49–53.
Original Russian Text Copyright © 2005 by Aleksandrov, Nikol’ski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Novatski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Sakuta, Stepanov.
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Aleksandrov, D.V., Nikol’skii, E.Y., Novatskii, B.G. et al. Search for resonances in the three-and four-neutron systems in the 7Li(7Li, 11C)3n and 7Li(7Li, 10C)4n reactions. Jetp Lett. 81, 43–46 (2005). https://doi.org/10.1134/1.1887912
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DOI: https://doi.org/10.1134/1.1887912