Characterization of the Energy Spectrum at the Indiana University NREP Neutron Source

<p>The neutron source at the Indiana University Cyclotron Facility produces neutrons via proton bombardment of a natural beryllium (100% 9Be) target. This source has two beam lines: the LENS and the NREP. The energy spectrum of the neutrons produced on the NREP beam line has not yet been characterized. Through simulation using the GEANT and MCNP particle transport codes as well as neutron activation analysis experiments an attempt was made to characterize the energy spectrum of the neutron production source. First the neutron production spectrum of beryllium simulated using GEANT was compared with literature; there are significant deviations. Next foils and wires of pure elements were irradiated in the neutron beam target area and the resulting gamma spectrum measured. This information was used in an unfolding code SAND-II to deconvolve the neutron energy spectrum observed at the target. A number of approximations were made to properly account for beam duty time and neutron production anisotropy. The resultants provide a better understanding of the spectrum but continued work is needed to produce a useful spectrum for the users of the facility.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p>