Investigation of the Outgoing Tritons Angular Distribution in the ⁹Be(n,t₁γ)⁷Li* Reaction at 14.9 MeV by the Line Shape Analysis of the 0.4776-MeV Gamma Transition

Abstract

Doppler broadening line shapes of 0.4776-MeV gamma transition of ⁷Li* populated in the ⁹Be(n,t₁γ) reaction at 14.9 MeV have been analyzed at 40-, 55-, and 90-deg detector positions in respect to the beam axis for the evaluation of the angular distribution W(θ) of outgoing tritons (t₁) after the population of first ⁷Li excited state. A nonsymmetrical shape of the W(θ) dependence with the Legendre polynomial coefficients A₁ = 0.31 ± 0.06 and A₂ = 0.23 ± 0.06 has been found. That fact does not support the belief in the simple nuclear reaction mechanism through the single isolated level of ¹⁰Be compound. Obtained data are compared with other available experimental results.