Directional properties of a modified Bonner spectrometer

The study of the directional properties of a modified Bonner type spectrometer, are reported in this paper. It was established in a previous publication [1], that a small radial hole on each polyethylene sphere gives rise to a directional sensitivity when used on this apparatus. Now, the directional properties are further improved by adding a thin cylindrical cadmium shell inserted in the radial holes of each sphere. The angular response for a set of six spheres is reported using, both, a fast (non-moderated) and a moderated neutron source provided by the ⁹Be(d,n)¹⁰B reaction by bombarding a thick beryllium target with 4 MeV deuterons.