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Prompt Neutron Polarization Asymmetries in Photossion of Isotopes of Thorium, Uranium, Neptunium, and Plutonium

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Date
2013
Author
Mueller, Jonathan Michael
Advisor
Weller, Henry R
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Abstract

Nearly mono-energetic, high intensity (~10<super>7</super> gamma/s), and approximately 100% linearly polarized gamma-ray beams at energies between 5.15 and 7.60 MeV were used to induce photofission of <super>232</super>Th, <super>233,235,238</super>U, <super>237</super>Np, and <super>239,240</super>Pu. Prompt fission neutron yields parallel and perpendicular to the plane of beam polarization were measured using arrays of 12-18 liquid scintillator detectors. Prompt neutron polarization asymmetries close to zero were found for the even-odd actinides (<super>233,235</super>U, <super>237</super>Np, and <super>239</super>Pu), while significant asymmetries were found for the even-even actinides (<super>232</super>Th, <super>238</super>U, and <super>240</super>Pu). Predictions based on previously measured fission fragment angular distributions combined with a model of prompt neutron emission agree well with our experimental results. Finally, we describe a new method of measuring the enrichment of special nuclear material based on our results.

Type
Dissertation
Department
Physics
Subject
Nuclear physics
applied nuclear physics
experimental nuclear physics
fission
photofission
Permalink
https://hdl.handle.net/10161/8230
Citation
Mueller, Jonathan Michael (2013). Prompt Neutron Polarization Asymmetries in Photossion of Isotopes of Thorium, Uranium, Neptunium, and Plutonium. Dissertation, Duke University. Retrieved from https://hdl.handle.net/10161/8230.
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