EXPERIMENTAL STUDIES OF OSMIUM-188

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1962

OSTI ID:4770384

Warner, L B

An experimental investigation of the nuclear energy levels of Os/sup 188/ was conducted in order to provide a link between the deformed nuclei, with mass number roughly between 152 and 190, and the spherical nuclei, with mass number around 208, in the hope of illuminating the mechanism of intermediate coupling, allowing comparison of certain nuclear models and understanding anomalies between models and other trends in this region of the nuclear periodic table. The studies were performed in two parts: first, through the analysis of the decay products of Re/sup 188/ and Ir/sup 188/, and, second, through the analysis of the reaction Os/sup 187/(d,p)Os/sup 188/. Forty-one-hour Ir/sup 188/ was produced by Re/sup 187/( alpha ,3n)Ir/sup 188/ and studied in the Gerholm electronelectron coincidence spectrometer and a conventional gamma-gamma spectrometer, both with fast-slow coincidence electronics. Seventeen-hour Re/jsup 188/ and 21-minute Re/ sup 188m/ were produced by Re/sup 187/(n, gamma )Re/sup 188/ and examined with fast-slow gamma-gamma coincidence equipment. The weak positron spectrum of Ir/ sup 188/ was analyzed and found to consist of branches with end points at 1656 plus or minus 10 kev and 1211 plus or minus 45 kev. yielding Q/sub B+/ = 1811 plus or minus 10 kev. Coincidence relations and conversion electron energies, while confirming the main features of previously proposed decay schemes, suggest several additional states. The reaction Os/sup 187/(d,p)Os/sup 188/ was investigated, using 12-Mev deuterons and analyzing the outgoing protons with a broad-range magnetic spectrograph. The Q value of the reaction was set at 5602 plus or minus 20 kev. Lowlying levels are in agreement with those observed in the decay spectroscopy; new states were observed above the energy accessible in the decay experiment. The energy level scheme obtained in these experiments was compared with the predictions, of the models of Bohr and Mottelson and of Davydov and Chaban; these comparisons confirm the previous classification of Os/sup 188/ as a transitional or intermediate-coupling nucleus, in agreement with its location in the nuclear periodic table between strongly deformed and spherical nucleus, (Dissertation Abstr., 23: No. 3, 1962)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-002332
• OSTI ID: 4770384
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA BEAMS
BOHR-MOTTELSON MODEL
COINCIDENCE METHODS
DAVYDOV- FILIPOV MODEL
DAVYDOV-FILIPOV MODEL
DECAY
DEFORMATION
DEUTERON BEAMS
ELECTRONS
ENERGY
ENERGY LEVELS
GAMMA SPECTROMETERS
INTERACTIONS
INTERNAL CONVERSION
IRIDIUM 188
ISOMERS
MAGNETIC FIELDS
MASS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
OSMIUM 187
OSMIUM 188
PHYSICS
POSITRONS
PROTONS
Q-VALUE
RHENIUM 187
RHENIUM 188
SPECTRA
SPECTROMETERS
TABLES