Neutron-induced fission of 235U is studied at the thermal column of the UMass Lowell 1-MW Research Reactor. A collimated, 2.25-inch diameter beam of thermal neutrons with a flux of ~5x105 n/s/cm2 induced fission reactions in a plate of low enriched Uranium with an areal density of ~25 mg/cm2 of 235U. A prompt fission-neutron tagging method is used to identify the fission reaction in the off-line analysis. The method employs the pulse-shape discrimination of neutrons and gamma-ray events in Stilbene scintillator and enables identification of coincidence events of prompt fission gamma-rays and prompt fission neutrons in coincidence time intervals less than 20-30 ns. Prompt gamma-ray radiation is detected using two co-linear NaI(Tl) detectors. The measured spectra of prompt-fission gamma rays between 150 keV and 6 MeV are presented, with subtracted background radiation. The results from these initial measurements demonstrate the feasibility of the experimental method and future measurements with extended arrays of detectors are planned.
|Commitee:||Kamal, Archana, Rogers, Andrew M.|
|School:||University of Massachusetts Lowell|
|School Location:||United States -- Massachusetts|
|Source:||MAI 82/8(E), Masters Abstracts International|
|Subjects:||Nuclear physics, Optics, Thermodynamics, Remote sensing|
|Keywords:||Neutron-induced fission , Gamma-ray measurement, Uranium, Thermal column, Thermal neutrons, Fission-neutron tagging, Background radiation|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be