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Rykaczewski, Krzysztof Piotr; Grzywacz, Robert Kazimierz; Karny, M.; Batchelder, J. C.; Bingham, C.R.; Fong, D.; Gross, Carl J.; Krolas, W.; Mazzocchi, C.; Piechaczek, A.; Tantawy, M.N.; Winger, J.A.; Zganjar, E. F.
Oak Ridge National Laboratory, Holifield Radioactive Ion Beam Facility (United States). Funding organisation: SC USDOE - Office of Science (Seychelles) (US)2005
Oak Ridge National Laboratory, Holifield Radioactive Ion Beam Facility (United States). Funding organisation: SC USDOE - Office of Science (Seychelles) (US)2005
AbstractAbstract
[en] Proton emitter studies enable precise probing of the composition of the wave function of nuclei beyond the proton dripline. In a decay of proton radioactive odd-odd nuclei excited levels in the (even-Z,odd-N) daughters can be populated allowing us to deduce the properties of single particle neutron states. So far, fine structure in proton emission was observed for only one odd-odd emitter, 146Tm. The neighboring odd-odd isotope 144Tm is an obvious candidate to exhibit similar decay pattern. Its decay should be dominated by a large πh11/2 component present in the ground and isomeric state wavefunction, as it was observed for 146Tm and 145Tm. The admixture of the 2+ (o)times πf7/2 component or of the mirror (νh11/2 πs1/2) proton-neutron configuration can cause the fine structure in proton emission. Evidence for the proton decay of 144Tm was found in an experiment at the Recoil Mass Spectrometer at Oak Ridge National Laboratory. The 144Tm events were found in a weaK. (σ ∼ 10 nb) p5n channel of the fusion reaction of 58Ni beam at 340 MeV on a 92Mo target. The observed decay energy of about 1.8 MeV and the half-life of the order of ∼ 1 (micro)s suggest proton emission from the dominant πh11/2 part of the wave function. The detection of this very short proton emitter was made possible by use of a double-sided silicon strip detector connected to a fast Digital-Signal-Processing-based acquisition system
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ORNL/PTS--5503; KB0401021; ERKBP06; AC05-00OR22725
Record Type
Journal Article
Journal
European Physical Journal. A; ISSN 1434-6001; ; v. 25; p. 145-147
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