排序方式: 共有24条查询结果,搜索用时 11 毫秒
1.
John L. Wood Johannes Schwarzenberg Edward F. Zganjar Dubravka Rupnik 《Hyperfine Interactions》1992,75(1-4):51-58
State-of-the-art spectroscopy of nuclei far from stability has achieved an extraordinary level of sophistication and detail
in the last ten years. In principle, if a state can be populated, it can be characterized by its energy, spin, parity, and
major decay paths. Sometimes its lifetime can be measured. In practice, one is confronted with enormous complexity. To convert
raw spectroscopic data into nuclear structure data involves a complex process of disentangling gamma rays and conversion electrons
into decay schemes. Specifically, coincidence techniques, especially coincidence intensities, play a crucial role in this
process. Recent examples and methods from work done at UNISOR are presented. 相似文献
2.
Y. Xu K. S. Krane M. A. Gummin J. L. Wood M. M. Jarrio J. B. Breitenbach E. F. Zganjar D. Rupnik H. K. Carter P. F. Mantica Jr. B. E. Zimmerman 《Hyperfine Interactions》1992,75(1-4):481-487
The184Au→184Pt decay, studied on-line with the UNISOR facility at HHIRF, is discussed. Gamma-ray and conversion-electron spectroscopy
of184Pt as well as on-line nuclear orientation measurements of184Au were done. A new low-lying level scheme of184Pt is proposed. Two coexisting bands with different deformations and their respective γ-vibrational bands are established.
Internal conversion coefficients for interband transitions between states with the same spin are extracted from the spectroscopy
measurements. The relative E0 contents of the transitions are determined by combining internal conversion coefficients with
E2/M1 mixing ratios deduced from gamma-ray anisotropies measured from oriented nuclei. 相似文献
3.
W.C. Ma A.V. Ramayya J.H. Hamilton S.J. Robinson M.E. Barclay K. Zhao J.D. Cole E.F. Zganjar E.H. Spejewski 《Physics letters. [Part B]》1984,139(4):276-278
The energy levels of 182Hg have been identified for the first time through comparison of in-beam studies of the reactions 156,154Gd(32S, 4n)184,182Hg and γ-X-ray coincidences. Levels up to 12+ in 182Hg were established from γ-γ coincidences and singles measurements. The data establish that the ground state shape is near spherical, and that the ground band is crossed by a well-deformed band at 4+. In contrast to IBA model predictions that the deformed band will rise in energy in 182Hg compared to 184Hg, the energies of the deformed levels in 182Hg continue to drop. 相似文献
4.
Karny M Grzywacz RK Batchelder JC Bingham CR Gross CJ Hagino K Hamilton JH Janas Z Kulp WD McConnell JW Momayezi M Piechaczek A Rykaczewski KP Semmes PA Tantawy MN Winger JA Yu CH Zganjar EF 《Physical review letters》2003,90(1):012502
Fine structure in proton emission from the 3.1(3) mus activity of 145Tm was discovered by using a novel technique of digital processing of overlapping recoil implantation and decay signals. Proton transitions to the ground state of 144Er and to its first excited 2(+) state at 0.33(1) MeV with a branching ratio I(p)(2(+))=9.6+/-1.5% were observed. The structure of the 145Tm wave function and the emission process were analyzed by using particle-core vibration coupling models. 相似文献
5.
The phenomena associated with shape coexistence and intruder states are illustrated with examples from the Pt, Au, Hg, Tλ,
Pb and Bi isotopes which lie far from beta stability midway between closed neutron shells 82 and 126. The type of spectroscopic
measurements which have already been developed to investigate these structures as well as those types of measurements needed
to extend and quantify the analysis, such as on-line nuclear orientation, are discussed. 相似文献
6.
Hyland B Svensson CE Ball GC Leslie JR Achtzehn T Albers D Andreoiu C Bricault P Churchman R Cross D Dombsky M Finlay P Garrett PE Geppert C Grinyer GF Hackman G Hanemaayer V Lassen J Lavoie JP Melconian D Morton AC Pearson CJ Pearson MR Phillips AA Schumaker MA Smith MB Towner IS Valiente-Dobón JJ Wendt K Zganjar EF 《Physical review letters》2006,97(10):102501
A high-precision branching ratio measurement for the superallowed beta+ decay of 62Ga was performed at the Isotope Separator and Accelerator radioactive ion beam facility. Nineteen gamma rays emitted following beta+ decay of 62Ga were identified, establishing the dominant superallowed branching ratio to be (99.861+/-0.011)%. Combined with recent half-life and Q-value measurements, this branching ratio yields a superallowed ft value of 3075.6+/-1.4 s for 62Ga decay. These results demonstrate the feasibility of high-precision superallowed branching ratio measurements in the A>or=62 mass region and provide the first stringent tests of the large isospin-symmetry-breaking effects predicted for these decays. 相似文献
7.
C. D. Papanicolopulos M. A. Grimm J. L. Wood E. F. Zganjar M. O. Kortelahti J. D. Cole H. K. Carter 《Zeitschrift für Physik A Hadrons and Nuclei》1988,330(4):371-376
Levels in185, 187Au have been studied by radioactive decay of isotopically separated185, 187Hg. A number of low-energy very-converted transitions are observed in the decay. It is shown that the enhanced conversion in these cases comes from an E0 component rather than from an anomaly in theM1 conversion process. A systematic pattern of bands interconnected with these very converted transitions is presented as evidence for a new type of particle-core coupling in185, 187Au. 相似文献
8.
J. C. Batchelder K. S. Toth C. R. Bingham L. T. Brown L. F. Conticchio C. N. Davids T. Davinson D. J. Henderson R. J. Irvine D. Seweryniak W. B. Walters P. J. Woods J. Wauters E. F. Zganjar 《Zeitschrift für Physik A Hadrons and Nuclei》1997,357(2):121-122
The α decay of 186Bi was investigated via the 97Mo(92Mo, p2n) reaction and the use of a fragment mass analyzer with a double-sided Si strip detector. In contrast to an earlier work wherein only one α transition was reported, we observed two transitions arising from two isomers in 186Bi with energies and half-lives of: 7158(20) keV, T1/2 = 15.0(17) ms; and 7261(20) keV, T1/2 = 9.8(13) ms. 相似文献
9.
The strength of electric monopole (E0) transitions is related to differences in mean-square charge radii and differences in quadrupole deformation in nuclei. Estimates are made of E0 decay versus M1, E1, and E2 decay out of superdeformed bands. It is suggested that E0 decay may dominate, providing a (partial) answer to the superdeformed band “drainingr problem. 相似文献
10.
W. Kurcewicz E. F. Zganjar R. Kirchner O. Klepper E. Roeckl P. Komninos E. Nolte D. Schardt P. Tidemand-Petersson 《Zeitschrift für Physik A Hadrons and Nuclei》1982,308(1):21-31
Very neutron-deficient isotopes of rhodium, palladium, silver, cadmium and indium in theN=50 region were studied at the GSI on-line mass separator following bombardment of58, 60, 62Ni and63, 65Cu targets with 4.0 MeV/u ions of40Ca. The known properties of the β-delayed proton precursor95m Pd were confirmed, but a search for direct proton decay of95m Ag was not successful. Beta-delayed proton activities observed at mass-numbers 94, 96, 97 and 100 were assigned to the precursors94Rh(66±14 s),96Ag(5.1±0.4s),97Cd(3 ?2 +4 s) and100In. In addition,94Pd(9.0±0.5 s) was identified from β-γ-X studies. Individual decay schemes of95m96Pd and96, 98Ag are reported. 相似文献