Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Quarterly Status Report 4.
We have used the DROSG-2000 code (developed by M. Drosg) to investigate neutron spectra generated by various reactions that may by utilized to generate source neutrons in our experiment: the (sup 15)N(p,n) (sup15) O and D(d,n) (sup3) He interactions. Based on our analyses, we have chosen the (sup 15)N(p,n) (sup15) O reaction as the source for neutrons with energy less than 4 MeV. Neutrons arising from this reaction are (essentially) monoenergetic for the entire energy region for which this source will be used. For the generation of higher energy neutrons (> 4 MeV), we have chosen the D(d,n) (sup3) He reaction. With this reaction, however, there is an accompanying background due to deuteron breakup that occurs when they strike deuterons in the target. Literature searches have revealed ways to deal with this background. This effect could also be included as an aspect of the global experimental model. For tier information see Appendix A. From the aforementioned analyses, We have obtained tie appropriate neutron spectra needed for performing the necessary neutron transport calculations needed by the project. In addition, we have procured the 1% and deuterium target gases needed for the targets, and have fabricated target cells for use in the experiments.
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