14 research outputs found
EXCITATION FUNCTIONS FOR PRODUCTION OF HEAVY ACTINIDES FROM INTERACTIONS OF 16O WITH 249Cf
Architectural drawing of sections and details of the Newhouse Building, located at Main Street and Exchange Place, Salt Lake City, Utah. Sheet A-11 in a set drawn by George W. Poulsen and Associates, Consulting Engineers, as contractors for George Cannon Young in connection with a project renovating the air conditioning system in the building, 1960-196
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EXCITATION FUNCTIONS FOR PRODUCTION OF HEAVY ACTINIDES FROM INTERACTIONS OF 16O WITH 249Cf
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Decay of the Neutron-Rich Isotope {sup 171}Ho and the Identification of {sup 169}Dy
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Decay of the Neutron-Rich Isotope {sup 171}Ho and the Identification of {sup 169}Dy
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Decay Studies of the Neutron-Rich Isotopes {sup 168}Dy and {sup 168}Ho{sup g} and the Indentification of the New Isomer {sup 168}Ho{sup m}
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Nuclear-decay studies of neutron-rich rare-earth nuclides
Neutron-rich rare-earth nuclei were produced in multinucleon transfer reactions of {sup 170}Er and {sup 176}Yb projectiles on {sup nat}W targets at the Lawrence Berkeley Laboratory SuperHILAC and their radioactive decays properties studied at the on-line mass separation facility OASIS. Two unknown isotopes, {sup 169}Dy (t {sub 1/2} {equals} 39 {plus minus} 8 s) and {sup 174}Er(t{sub 1/2} {equals} 3.3 {plus minus} 0.2 m) were discovered and their decay characteristics determined. The decay schemes for two previously identified isotopes, {sup 168}Dy (t{sub 1/2} {equals} 8.8 {plus minus} 0.3 m) and {sup 171}Ho (t{sub 1/2} {equals} 55 {plus minus} 3 s), were characterized. Evidence for a new isomer of 3.0 m {sup 168}Ho{sup g}, {sup 168}Ho{sup m} (t{sub 1/2} {equals} 132 {plus minus} 4 s) which decays by isomeric transition (IT) is presented. Beta particle endpoint energies were determined for the decay of {sup 168}Ho{sup g}, {sup 169}Dy, {sup 171}Ho, and {sup 174}Er, the resulting Q{beta}-values are: 2.93 {plus minus} 0.03, 3.2 {plus minus} 0.3, 3.2 {plus minus} 0.6, and 1.8 {plus minus} 0.2 MeV, respectively. These values were compared with values calculated using recent atomic mass formulae. Comparisons of various target/ion source geometries used in the OASIS mass separator facility for these multinucleon transfer reactions were performed. 73 refs., 40 figs., 11 tabs
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Nuclear Decay Studies Far from Stability
Nuclear decay studies far-from-stability are performed not merely to characterize new isotopes, but to establish an experimental footing for improving our theoretical understanding of nuclear structure and decay. Although progress has been made in explaining low-lying level structure for a broad range of nuclei, transition probabilities are not yet quantitatively understood. The ability to understand nuclei far-from-stability is important to astrophysics for extending r- and s-process calculations to unknown nuclei, and to nuclear engineering for decay-heat calculations. Finally, by studying nuclei far-from-stability, we probe extremes of both decay energy and proton-neutron ratios where unforeseen and important new nuclear properties may be exhibited. The decays of nearly 100 isotopes and isomers have been studied with the OASIS mass-separation facility on-line at the Lawrence Berkeley Laboratory SuperHILAC. These studies have concentrated on neutron-deficient nuclei with 55{le}Z{le}71 up to A=157 and neutron-rich nuclei with 166{le}A{le}174. The results of these experiments are combined in this paper with those from many other laboratories to provide insight into systematic trends of beta- and {gamma}-ray transition probabilities near N=82. It is hoped that the smooth systematic trends in these transition probabilities will provide clues towards interpreting the underlying nuclear structure. Nuclei near N=82 and Z=64 are expected to be spherical and should be described by simple Shell Model considerations. Away from the shell closures, deformation sets in which should exhibit itself in the transition probabilities. The Z=64 shell closure is expected to disappear near N=78. The qualitative nature of these phenomena will be discussed