Magnetic moments of the 12+ isomeric states in 194, 196, 198Pb
Abstract
The g-factor of the 12+ isomeric state in lead isotopes with A = 194, 196, 198 was measured using the time-differential perturbed angular distribution method (TDPAD). The values obtained are respectively g(194) = −0.158(6); g(196) = −0.157(7); g(198) = −0.144(11). A more precise determination of the 12+ level half-life is also made. The g-factprs of these nuclear states, which are described with v(i)−2 as the main configuration, are surprisingly constant over a large mass range (between A = 206 and 194). A core polarization analysis explains this trend: the polarization induced on neutrons in i orbit decreases with the mass number A (blocking effect), but a compensation is provided by the other spin-orbit partners f-f and P-P.
References (26)
- M. Pautrat et al.
Nucl. Phys.
(1973) - A. Hanser
Nucl. Phys.
(1970)M. Pautrat et al.Nucl. Phys.
(1973) - T. Yamazaki et al.
Phys. Rev.
(1968) - K.H. Maier et al.
Nucl. Phys.
(1972) - K.G. Rensfelt et al.
- C. Roulet
Thesis
(1975) - H. Frauenfelder et al.
Alpha-, beta- and gamma-ray spectroscopy
- P. Heubes et al.
- R. Bauer et al.
Nucl. Phys.
(1973) - T. Yamazaki
Nucl. Phys.
Cited by (38)
Nuclear Data Sheets for A=194
2021, Nuclear Data SheetsExperimental nuclear structure and decay data are evaluated for all of 14 known nuclides of mass 194 (Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Po, At, Rn). Detailed evaluated spectroscopic information is presented for each reaction and decay experiment, and by combining all the available data, recommended values are provided for energies, spins and parities and half-lives of levels, together with energies, branching ratios and multipolarities of gamma radiations from the levels, and characteristics of beta and alpha radiations in radioactive decays. No excited states have yet been identified in 194Ta, 194W, and 194Rn. Only limited spectroscopic data are available for 194Re, with a 45−μs isomer identified, but its absolute energy yet to be determined. Only two levels at unknown absolute energies are reported for 194At, both of which are isomeric but neither can be unambiguously identified as the ground state. Data are scarce for 194Os, 194Bi and 194Po, while 194Pt, 194Au, 194Hg, 194Tl and 194Pb are well studied through decays and reactions. For 194Ir, although a major (n, γ), E=thermal study and two particle-transfer studies provide large amounts of spectral data, still several problematic issues are found in the assignment of multipolarities for the secondary gamma transitions in the (n, γ) study by 2008Ba25, 1998Ba85 and 1998Ba42, all from the same group. Some issues have been resolved by the evaluators, but we suggest that further experimental work is needed on 194Ir structure to resolve standing issues, and verify the conclusions made by 2008Ba25. Our attempt to contact the prime authors of the 2008Ba25 paper was not successful. The present work supersedes all the earlier evaluations of A=194 nuclides by 2006Si17, 1996Br26, 1989Si01 and 1972Au11.
Nuclear Data Sheets for A = 198
2016, Nuclear Data SheetsThe 2009 version of Nuclear Data Sheets for A=198 (2009Hu11) has been updated and revised on the basis of the experimental results from various decay and reaction studies before December 2014. The experimental data for all known nuclei with mass number A=198 (Re,Os,Ir,Pt,Au,Hg,Tl,Pb,Bi,Po,At,Rn,Fr) have been revised, updated, and incorporated into the ENSDF data file. The experimental methods, references, Jπ arguments, and necessary comments are given in the text. The adopted levels for 198Re and 198Fr are firstly presented in this evaluation. In addition, Q values have been updated based on 2012Wa38.
Nuclear Data Sheets for A = 198
2009, Nuclear Data SheetsThe 2002 version of Nuclear Data Sheets for A = 198 (2002Zh04) has been updated and revised on the basis of the experimental results from various decay and reaction studies before June 2008. The experimental data for all known nuclei of A = 198 (Ir,Pt,Au,Hg, Tl,Pb,Bi,Po,At,Rn) have been reevaluated. The experimental methods, references, Jπ arguments, and necessary comments are given in the text. The theoretical internal conversion coefficient (ICC) (and its associated uncertainty) for γ-rays have been interpolated from theoretical values based on the “Frozen Orbital” approximation (2002Ba85) using the BRICC(v2.2) computer program. Summary band-structure drawings and level schemes from both radioactive decay and reaction studies are presented. Also of special interest are the new levels of 198Ir, 198Tl nuclei and identification of new superdeformed bands in 198Pb and 198Po.
Nuclear Data Sheets for A = 196
2007, Nuclear Data SheetsThe 1998 version of nuclear data sheets for A = 196 has been revised and updated on the basis of the experimental results from various decay and reaction studies before January 2006. The experimental data for all known nuclei of A = 196 (Os,Ir,Pt,Au,Hg, Tl,Pb,Bi,Po,At,Rn) have been reevaluated. The experimental methods, references,Jπ arguments,and necessary comments are given in the text. Summary band structure drawings and level schemes from both radioactive decay and reaction studies are presented. Also of special interest are the new identification of superdeformed bands in 196Pb and 196Bi.
Nuclear Data Sheets for A = 194
2006, Nuclear Data SheetsNuclear spectroscopic information for known nuclides of mass number 194 (Re,Os,Ir,Pt,Au,Hg,Tl,Pb,Bi, Po,At) with Z = 75 to 85 and N = 119 to 109 have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No excited state data are yet available for 194Re and 194At. Many superdeformed structures are known in A = 194: three SD bands in 194Hg, two of which are connected to the normal-deformed structures; six SD bands in 194Tl; and three SD bands in 194Pb, one of which is connected to the normal-deformed structure. In addition four magnetic-rotational (MR) dipole bands are known in 194Pb together with many other dipole bands which are probable multi-quasiparticle structures. This evaluation supersedes previous full evaluations of A = 194 published by 1996Br26, 1989Si01, 1977Ha46 and 1972Au11.
Nuclear data sheets for A = 198
2002, Nuclear Data SheetsAbstract: The 1995 version of Nuclear Data Sheets for A=198 (1995Zh03) has been updated and revised on the basis of decay and reaction experiments, which lead to nuclei in the A=198 mass chain. The data sets of experimental reaction and decay studies are presented in the drawings or tables. The adopted values of levels and their γ-radiations, and as well as other nuclear properties are presented in tables. The experimental methods, references, and comments are given in the text.
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Research Institute for Physics Stockholm, Sweden.
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Université Libre de Bruxelles, Belgique.
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Université Libre de Bruxelles, Belgique.