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Level structure of ¹⁵²Gd populated in ¹⁵²Tb β decay

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dc.contributor.advisor Krane, Kenneth Saul
dc.creator Stapels, Christopher John
dc.date.accessioned 2012-05-01T18:44:39Z
dc.date.available 2012-05-01T18:44:39Z
dc.date.copyright 2004-09-20
dc.date.issued 2004-09-20
dc.identifier.uri http://hdl.handle.net/1957/28956
dc.description Graduation date: 2005 en_US
dc.description.abstract As part of a research program to study the transitional region of N=88 isotones, ¹⁵²Tb was produced by the reaction ¹⁵¹Eu(α,3n)¹⁵²Tb in the 88" cyclotron located at LBNL. Gamma-ray spectroscopy of the radiation emitted from excited ¹⁵²Gd following the β⁺ decay of ¹⁵²Tb has been performed using an array of 20 germanium detectors. The large Q-value (3990 keV) of the ¹⁵²Tb 2⁻ decay allows for the population of many levels; study of coincidence and single events resulted in the establishment of 54 new levels and 266 new transitions. Angular correlation of the coincidences has determined spin and parity of many levels with several seen as key to the band structure, including two new 0⁺ levels. One new rotational band including the new 1475.2 keV 0⁺ level and the 1771.7 keV 2⁺ level is proposed. The overall band structure compared to collective excitation models demonstrates the position of ¹⁵²Gd in the transition from a spherical to deformed shape, also seen in other N=88 isotones. Monopole transition strength among bands indicates the possibility of mixing of both shapes among the excited states. The remarkable similarity of the band structure among these isotones is discussed. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Nuclear structure en_US
dc.subject.lcsh Beta decay en_US
dc.subject.lcsh Neutron-proton interaction en_US
dc.title Level structure of ¹⁵²Gd populated in ¹⁵²Tb β decay en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Physics en_US
dc.degree.level Doctoral en_US
dc.degree.discipline Science en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Jansen, Henri
dc.contributor.committeemember Warren, William
dc.contributor.committeemember Flahive, Mary
dc.contributor.committeemember Stetz, Al
dc.description.digitization File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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