Neutrons fromBe9(α,n)Reaction forEαbetween 6 and 10 MeV
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Abstract
Absolute differential cross sections have been measured as a function of angle and $\ensuremath{\alpha}$ bombarding energy for the reaction $^{9}\mathrm{Be}(\ensuremath{\alpha},n)^{12}\mathrm{C}$ leaving $^{12}\mathrm{C}$ in its ground, first excited, and second excited states. The angular distribution for the ground-state (0+ state) transition changed from a fore-aft peaking at ${E}_{\ensuremath{\alpha}}=6.8$ MeV to a three-peaked angular distribution at ${E}_{\ensuremath{\alpha}}=9.9$ MeV. Similar behavior was observed for the second-excited-state transition (0+). The angular distribution for the first-excited-state transition (2+) displayed fore-aft peaking and was not sensitive to bombarding energy. A strong, low-energy component, present at forward angles at all bombarding energies, can be accounted for by three- and four-body breakup reactions.
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