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Open Access Publications from the University of California

Thermal neutron radiative cross sections for Li 6,7, Be 9, B 10,11, C 12,13, and N 14,15

  • Author(s): Firestone, RB;
  • Revay, Z
  • et al.

Total thermal radiative neutron cross sections have been measured on natural and enriched isotopic targets containing Li6,7,Be9,B10,11,C12,13, and N14,15 with neutron beams from the Budapest Reactor. Complete neutron capture γ-ray decay schemes were measured for each isotope. Absolute transition probabilities have been determined by a least-squares fit of the transition intensities, corrected for internal conversion, to the (n,γ) decay schemes. The γ-ray cross sections were standardized using stoichiometric compounds containing both the isotope of interest and another element whose γ-ray cross sections are well known. Total cross sections σ0 were then determined for each isotope from the γ-ray cross sections and transition probabilities. For the B11(n,γ)B12 reaction decay transition probabilities were determined for the γ rays from B12 (t1/2=20.20 ms) β- decay.

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