Bushnell, David L.
M.S. (Master of Science)
Department of Physics
Natural abundance neodymium oxide targets located in the internal target facility of the Argonne CP-5 reactor were bombarded by thermal and epithermal neutrons to produce two kinds of spectra made up of primary transitions from the capture states. The thermal capture spectra differs from the average resonance (n̅,γ) spectra by revealing large fluctuations in the radiation widths whereas the average capture spectra tends to smooth these fluctuations. These transitions have energies ranging from 3.5 to 7.5 MeV. The energies and intensities of\these γ-rays are used to construct a level scheme for ¹⁴⁴Nd. The detection system consists of an intrinsic germanium detector placed in the center of a large annular NaI(Tl) scintillator which is divided into four optically independent quadrants. Threefold coincidence among the Ge detector and two opposite quadrants of the Nal(Tl) annulus produces a spectrum of double escape peaks. These peaks exhibited a 4.0 keV resolution when y-ray energies were between 5.3 and 5.5 MeV.
Hawkins, Jonnie Kyle, "Energy levels in ¹⁴⁴Nd via thermal and average resonance neutron capture γ-ray spectra" (1974). Graduate Research Theses & Dissertations. 2874.
x, 64 pages
Northern Illinois University
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