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Search for resonances in the three-and four-neutron systems in the 7Li(7Li, 11C)3n and 7Li(7Li, 10C)4n reactions

  • D. V. Aleksandrov
  • E. Yu. Nikol’skii
  • B. G. Novatskii
  • S. B. Sakuta
  • D. N. Stepanov
Fields, Particles, and Nuclei

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.

PACS numbers

25.70.Hi 27.10.+h 

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Copyright information

© Pleiades Publishing, Inc. 2005

Authors and Affiliations

  • D. V. Aleksandrov
    • 1
  • E. Yu. Nikol’skii
    • 1
  • B. G. Novatskii
    • 1
  • S. B. Sakuta
    • 1
  • D. N. Stepanov
    • 1
  1. 1.Russian Research Centre Kurchatov InstituteMoscowRussia

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