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Dissertation/Thesis Abstract

Prompt Fission Gamma-Ray Measurements at University of Massachuestts Lowell Research Reactor
by Stanescu, Razvan Teodor, M.S., University of Massachusetts Lowell, 2021, 95; 28260719
Abstract (Summary)

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.

Indexing (document details)
Advisor: Jandel, Marian
Commitee: Kamal, Archana, Rogers, Andrew M.
School: University of Massachusetts Lowell
Department: Physics
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
Publication Number: 28260719
ISBN: 9798569980963
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