Thesis (Ph. D.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 107-113). Also available on the World Wide Web.

Graduation date: 1992

A solid-state DE-E telescope beta spectrometer has been built and used to study beta-minus spectra. The system consists of a 15 mm x 500 mm$ sp2$ hyperpure germanium (HPGe) E-detector and a 300 $ mu$m x 200 mm$ sp2$ Si DE-detector with a special "keyhole" design. / The response function of the system has been determined experimentally using mono-energetic electron beams with incident energies ranging from 1 to 12 MeV. / The beta endpoint energies of 25 nuclei, namely, $ sp{32}$P, $ sp{88}$Rb, $ sp{91-99}$Rb, $ sp{91-96}$Sr, $ sp{99-100}$Sr, $ sp{92-96}$Y and $ sp{100}$Y have been measured. The Q-beta values and mass excesses for A = 91-100 have been determined. The results for $ sp{99}$Rb, $ sp{99-100}$Sr and $ sp{100}$Y have been obtained for the first time. / The beta strength functions for odd mass Rb isotopes, namely $ sp{91-99}$Rb have been measured for the first time from direct beta spectroscopy with a solid-state telescope system. The experimental results have been compared to calculations using the Brown-Bolsterli (B-B) model.

An accurate response function for a superconducting solenoid beta spectrometer for electrons up to 5.5 MeV has been found using Monte Carlo calculations and measurements of standard spectra. Experimental conditions affecting the response function have been studied and corrections for source scattering and pileup devised. / An anomalous shift in the electron energy calibration caused by the magnetic field has been discovered and explained. / The beta spectrum of ('32)P, ('90)Y, ('28)Al, ('42)K, ('38)Cl and ('88)Rb have been studied. Systematic uncertainties in endpoint, branch intensity and shape factor measurements have been estimated. / A beta spectra analysis program has been written to calculate endpoints, branch intensities and shape factors in a multi-branch spectrum. / The beta spectra of ('141)La, ('142)La, ('139)Ba, ('141)Ba, ('142)Ba, ('138)Cs and ('139)Cs have been studied. Q(,(beta))-values, intensities for all branches and some shape factors have been measured. / The shape factor of the ('20)F beta spectrum has been measured. The value found for the linear coefficient, a = 0.006 (+OR-) .002 (mc('2))('-1), supports the "weak magnetism" predictions of the Conserved Vector Current theory.

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Call number: LD2668 .T4 1984 S83 / Master of Science

The level structures of ('94)Ru, ('90)Mo, ('88)Zr, ('89)Mo and ('89)Nb have been studied via the decay of two isomers of ('94)Rh, two of ('90)Tc, two of ('88)Nb, one of ('89)Tc and one of ('89)Mo, respectively. These nuclides were produced via the proton bombardment of isotopically-enriched ('96)Ru and ('92)Mo as well as naturally-occurring Zr. Using gamma and beta spectroscopy techniques, detailed level schemes have been produced. / High-spin states in ('89)Nb, ('88)Zr and ('88)Nb have been studied with in-beam gamma-ray spectroscopy techniques. These nuclides were produced with alpha particle-induced reactions on ('89)Y. A neutron-multiplicity experiment was used to identify the nucleus to which several gamma-rays belong. / The systematics of the N = 48 and 47 nuclei, along with theoretical descriptions based on the nuclear shell model, are discussed. Contributions to original knowledge are summarized in Chapter V.

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