Structure of doubly-odd nucleus 184Ir from the decay of 184Pt

doi:10.1016/0375-9474(88)90170-4

Nuclear Physics A

Volume 482, Issues 3–4, 6 June 1988, Pages 553-572

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Abstract

States of ¹⁸⁴Ir populated through the β⁺/EC decay of ¹⁸⁴Pt were studied using mass-separated sources and on-line -γ-ray and e⁻ spectroscopic techniques. A rather complete low-spin level scheme is established. Negative and positive parity structures are interpreted within the two-quasiparticle- plus-rotor model. They are mainly the $\ ̃ gp h_{92} ⊗ \ ̃ gn i_{132}$ structure based on the 5⁻ ground state and the $\ ̃ gph_{92} ⊗ \ ̃ gn 12^{−} [521]$ system of states based on a 3⁺ isomer at 225.7 keV.

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Nuclear Data Sheets for A = 184
2010, Nuclear Data Sheets
Nuclear structure and decay data for all nuclei with mass number A=184 (Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi) have been evaluated, and the corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation supersedes the previous publication (R.B. Firestone, Nuclear Data Sheets 58, 243 (1989) (literature cutoff date 1 June 1989)) and subsequent revisions of high spin data for several nuclides by Huo Junde (31 July, 1995) and evaluations by C.M. Baglin for ¹⁸⁴Au, ¹⁸⁴Pb and the new nuclide ¹⁸⁴Bi (literature cutoff dates 4 April 2003, 28 July 2003 and 21 January 2004, respectively). The present evaluation includes literature available by 1 October 2009. Subsequent to those evaluations, (HI, xnγ) studies have contributed significantly to our knowledge of the structure of ¹⁸⁴Re (2005Wh04), ¹⁸⁴Os (2002Sh21, 2002Wh01, 1998Sh36), ¹⁸⁴Hg (1995De30, 1995Sf01) and ¹⁸⁴Au (2004Zh38). Additional information on the level structure of ¹⁸⁴W has become available from new thermal neutron capture measurements (2003Bo52, 2004Lo22, 2007ChZX), from detailed $(p, t)$ reaction studies (2006Me25), new Coulomb excitation (1991Wu05) and $(γ, γ^{'})$ (1993He15) studies, and from the ¹⁹⁸Pt(¹³⁶Xe,Xγ) reaction (2004Wh02); knowledge of ¹⁸⁴Pt has benefited from a new ¹⁸⁴Au ε decay study (2006KrZT, 1992Xu02, 1992Xu06, 1992XuZY), but this decay cannot yet be normalized due to the mixed parentage of the sources used.
Lifetime measurements by delayed coincidences with and without a complete knowledge of the prompt curve. Application to levels in 184Ir and 185,187Pt
1996, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
A method is described which enables one to deduce a range of possible values for the lifetime of a nuclear level when the delayed coincidence curve is experimentally given and the prompt curve is known only through some of its features. The method still applies when a prompt contribution is present. Experimental data in ¹⁸⁴Ir are analyzed, and yield T_1/2(293 keV) = 1.1(3) ns, T_1/2(70.7)<180ps. The method is also used to discuss results obtained with an experimental prompt curve in ¹⁸⁵Pt [T_1/2(201) = 728(20) ps] and ¹⁸⁷Pt[T_1/2(260) = 163(6) ps, T_1/2(181) = 1.68(4) ns].
The low-spin states in the doubly odd 182Ir nucleus and the influence of the proton-neutron interaction
1995, Nuclear Physics, Section A
Low-spin states of ¹⁸²Ir populated through the $β^{+} EC$ decay of ¹⁸²Pt were studied using the ISOCELE facility. A low-spin level scheme has been established. Using a semi-microscopic rotor-plus-two-quasiparticle model developed in the context of the HF + BCS approximation, the influence of the V_pn interaction on the relative energy location of excited states has been studied and the low-spin states located at low energy in ¹⁸²Ir have been identified. The α-decay energy of ¹⁸⁶Au has been corrected to 4907 ± 16 keV.
Structure of low-spin states in 186Ir
1991, Nuclear Physics, Section A
Low-spin states of ¹⁸⁶Ir populated through the β⁺/EC decay of ¹⁸⁶Pt nuclei were studied using mass-separated sources and γ-ray and e⁻ spectroscopic techniques. A completely new level scheme of ¹⁸⁶Ir is established. It is shown that the 2⁻ isomeric state is located at an energy less than 1.5 keV above the 5⁺ ground state. A very low-energy transition from the 2⁻ isomer to the 5⁺ ground state has to exist in order to explain the data, and its relative intensity has been estimated to be around 25% of the total decay of the 2⁻ state. Most of the experimental levels are interpreted within the two-quasiparticle-plus-rotor model.
Laser spectroscopy of laser-desorbed gold isotopes
1990, Nuclear Physics, Section A
Changes in mean-square charge radius δ〈r²〉, and magnetic dipole moments μ₁ have been measured for a series of neutron-deficient gold isotopes between A = 186 and 196, and for neutronrich ^198,199Au, using the PILIS system on-line with the ISOCELE mass separator. These measurements confirm the existence of the shape transition between A = 186 and 187. The measured μ₁ values have been compared with calculations using Nilsson, and symmetric-rotor-plus-quasiparticle models. The results are consistent with the interpretation that ¹⁸⁶Au is prolate, and that the heavier isotopes have oblate, or possibly triaxial deformation.
Nuclear data sheets for A = 184
1989, Nuclear Data Sheets

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¹: Permanent address: Faculté des Sciences de Tunis, 1060 Le Belvédère, Tunis, Tunisie.

²: and Laboratoire de Physique Nucléaire, Université Paris VII, 75251 Paris, France.

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A = 184

Lifetime measurements by delayed coincidences with and without a complete knowledge of the prompt curve. Application to levels in <sup>184</sup>Ir and <sup>185,187</sup>Pt

The low-spin states in the doubly odd <sup>182</sup>Ir nucleus and the influence of the proton-neutron interaction

Structure of low-spin states in <sup>186</sup>Ir

Laser spectroscopy of laser-desorbed gold isotopes

Nuclear data sheets for A = 184