Publication Date

1974

Document Type

Dissertation/Thesis

First Advisor

Bushnell, David L.

Degree Name

M.S. (Master of Science)

Department

Department of Physics

LCSH

Neutrons--Capture||Neodymium--Isotopes

Abstract

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.

Comments

Includes bibliographical references.||Includes illustrations.

Extent

x, 64 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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