Abstract
Abstract The interaction of neutrons in the energy range 2.5 to 5 MeV in aluminium is studied by measuring the total cross section and the reaction cross sections for the (n,p) process and for the fast neutron radiative capture. Measurements are made in steps of about 25 keV for the total cross section and of about 50 keV for the (n, p) and (n,γ) cross sections with a neutron energy spread of about 50 keV in both cases. The structures of the cross sections are interpreted as due to statistical fluctuations of the level density of the Al28 intermediate nucleus. An estimate of an effective Al28 level density at an excitation energy E = 12.5 MeV is obtained from the fluctuations of the cross sections; the fit with the theoretical predictions is discussed.
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