Neutron Penetration Through Iron and Concrete Shields with the Use of 22.0- and 32.5-MeV Quasi-Monoenergetic Sources

For the first time, spectra in the range of 34 MeV down to 0.4 eV for neutrons that penetrated through iron and concrete shields were measured with the use of quasi-monoenergetic sources generated from a ^natLi(p,n)Be reaction.