Gyromagnetic ratios of excited states in 198Pt; measurements and interacting boson approximation model calculations

doi:10.1016/0375-9474(81)90299-2

Nuclear Physics A

Volume 365, Issue 2, 27 July 1981, Pages 317-332

https://doi.org/10.1016/0375-9474(81)90299-2 Get rights and content

Abstract

The enhanced transient hyperfine field manifest at the nuclei of swiftly recoiling ions traversing magnetized ferromagnetic materials was utilized to measure the gyromagnetic ratios of the 2⁺₁, 2⁺₂ and 4⁺₁ states in ¹⁹⁸Pt by the thin-foil technique. The states of interest were populated by Coulomb excitation using a beam of 220 MeV ⁵⁸Ni ions. The results obtained were: g(2⁺₁) = 0.324 ± 0.026; g(2⁺₂) = 0.34 ± 0.06; g(4⁺₁) = 0.34 ± 0.06. In addition, these measurements served to discriminate between the otherwise essentially equally probable values previously reported for the E2/M1 ratio of the 2⁺₂ → 2⁺₁ transition in ¹⁹⁸Pt. We also performed interacting boson approximation (IBA) model-based calculations in the O(6) limit symmetry, with and without inclusion of a small degree of symmetry breaking, and employed the M1 operator in both first- and second-order to obtain M1 selection rules and to calculate gyromagnetic ratios of levels. When O(6) symmetry is broken, there is a predicted departure from constancy of the g-factors which provides a good test of the nuclear wave function. Evaluative comparisons are made between these experimental and predicted g-factors.

References (17)

F. Iachello et al.
Phys. Lett.
(1974)
A. Arima et al.
Ann. Phys.
(1976)
R.F. Casten et al.
Phys. Lett.
(1978)
R.F. Casten et al.
Nucl. Phys.
(1978)
G. Goldring et al.
Nucl. Phys.
(1966)
O. Häusser et al.
Nucl. Instr.
(1980)
A. E. Stuchbery, C. G. Ryan, H. H. Bolotin and S. H. Sie, Phys. Rev. C, in...
O. Häusser et al.
Nucl. Phys.
(1979)
A. Arima et al.
Phys. Rev. Lett.
(1975)

There are more references available in the full text version of this article.

Cited by (47)

Nuclear Data Sheets for A = 198
2016, Nuclear Data Sheets
The 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 Sheets
The 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 Sheets
The 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 = 198
2002, Nuclear Data Sheets
Abstract: 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.
Measurement of a strong atomic hyperfine field allowing the determination of nuclear g-factors in (sub)nanosecond states
2001, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
An extension of the time-integrated atomic decoupling technique to measure g-factors of (sub)nanosecond isomers and/or the magnetic hyperfine field induced by highly excited atomic electrons on nuclei recoiling into vacuum is discussed. A high average field $B_{hf} =1080_{−175}^{+270} T$ and an average atomic spin J=2.7(2) is deduced using the known magnetic moment of a $4.05(7) μs$ isomer in ⁶⁹Ge. Such high magnetic fields allow g-factor measurements of (sub)nanosecond states. Ab initio calculations show that the combination of a high average magnetic hyperfine field and a high average atomic spin is only possible if a considerable fraction of the ions is in a metastable excited state.
Electromagnetic properties of low-excitation states in <sup>191</sup>Ir and <sup>193</sup>Ir and supersymmetry schemes
2000, Nuclear Physics A
The electromagnetic properties of low-excitation states in ¹⁹¹Ir and ¹⁹³Ir have been studied following Coulomb excitation. Gyromagnetic ratios were measured by the transient-field technique and level lifetimes were measured by the Doppler-shift recoil distance method. Multipolarity mixing ratios were determined from measured particle–γ angular correlations. The present lifetime and g-factor results extend the data available for comparison with theory and help discriminate between disparate experimental values reported previously in the literature. We compare the experimental data with particle-triaxial-rotor model calculations and with the predictions of the U(6/4) and U(6/20) supersymmetry models based on the interacting-boson–fermion model.

View all citing articles on Scopus

^†: Present and permanent address: School of Physics, University of Melbourne, Parkville, Victoria 3052, Australia.

^††: Present address: Division of Mineral Physics, CSIRO, North Ryde, NSW 2113, Australia.

View full text

Gyromagnetic ratios of excited states in 198Pt; measurements and interacting boson approximation model calculations

Abstract

Phys. Lett.

Ann. Phys.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr.

Nucl. Phys.

Phys. Rev. Lett.

Gyromagnetic ratios of excited states in ¹⁹⁸Pt; measurements and interacting boson approximation model calculations