ReactionBe9(α,n)C12from 1.7 to 6.4 MeV

Physical Review C1972Vol. 5(3), pp. 738–754

Citations Over TimeTop 10% of 1972 papers

Abstract

The 0\ifmmode^\circ\else\textdegree\fi{} excitation functions for the reaction $^{9}\mathrm{Be}(\ensuremath{\alpha},n)^{12}\mathrm{C}$ leading to the ground and first excited states of $^{12}\mathrm{C}$ were measured between 1.69- and 6.44-MeV bombarding energy, while those for the second- and third-excited-state neutron groups were measured above 2.94- and 5.94-MeV bombarding energy, respectively. Angular distributions of the ground state and first two excited-state neutron groups were measured at 17 bombarding energies between 3.21 and 6.44 MeV, and for the third-excited-state neutron group they were measured at 6.24- and 6.44-MeV bombarding energy. The magnitude of the cross sections for the ground- and first-excited-state neutron groups agrees well with the larger of the two sets of conflicting magnitudes reported in the literature. Double-differential cross sections of the continuum of low-energy neutrons were measured as a function of angle and neutron energy for 10 bombarding energies ranging from 4.86 to 6.44 MeV. The features of the continuum are consistent with the sequential decay $^{9}\mathrm{Be}+\ensuremath{\alpha}\ensuremath{\rightarrow}^{9}\mathrm{Be}^{*}+{\ensuremath{\alpha}}^{\ensuremath{'}}\ensuremath{\rightarrow}^{8}\mathrm{Be}+n+{\ensuremath{\alpha}}^{\ensuremath{'}}$, proceeding through the 1.67-, 2.43-, and 3.04-MeV excited states in $^{9}\mathrm{Be}$. The ratio of the populations of the first and second excited states in the $^{9}\mathrm{Be}(\ensuremath{\alpha},n)^{12}\mathrm{C}$ reaction was determined at 16 bombarding energies between 3.99 and 6.44 MeV.

Citations Over TimeTop 10% of 1972 papers

Abstract

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