Show simple item record

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

dc.contributor.advisor Weller, Henry R
dc.contributor.author Mueller, Jonathan Michael
dc.date.accessioned 2013-12-16T20:13:42Z
dc.date.available 2014-03-13T04:30:04Z
dc.date.issued 2013
dc.identifier.uri https://hdl.handle.net/10161/8230
dc.description.abstract <p>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.</p>
dc.subject Nuclear physics
dc.subject applied nuclear physics
dc.subject experimental nuclear physics
dc.subject fission
dc.subject photofission
dc.title Prompt Neutron Polarization Asymmetries in Photossion of Isotopes of Thorium, Uranium, Neptunium, and Plutonium
dc.type Dissertation
dc.department Physics
duke.embargo.months 0


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record