Band structure of 184Ir

doi:10.1016/0375-9474(88)90010-3

Nuclear Physics A

Volume 489, Issue 3, 28 November 1988, Pages 525-546

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Abstract

States of ¹⁸⁴Ir, excited through several (HI, xn) reactions were studied using in-beam γ-ray and conversion electron spectroscopy techniques. A new high-spin level scheme, comprising three different rotational bands is presented. The negative-parity ΔI = 1 ground-state band is the most complete example of the semidecoupled $\ ̃ gp h_{92} ⊗ v ̃ i_{132}$ structure, in a prolate deformed situation, known to date. The other two bands are the doubly decoupled $\ ̃ gph_{92} ⊗ v ̃ 12^{−} [521]$ and a ΔI = 1, $\ ̃ gp 52^{+} [402]⊗v i_{132}$ based structure of the compressed type.

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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.
Oblate bands in doubly odd 134La
1998, Nuclear Physics A
The band structures of the doubly odd ¹³⁴La nucleus have been investigated using the ¹³³Cs(α, 3n) ¹³⁴La reaction at a beam energy of 40 MeV. Altogether six bands have been established, of which details of the yrast band were only known from earlier works. A negative parity oblate band has also been observed in this nucleus. The observed level properties of the members of the yrast band have been compared with theoretical calculations performed within the Particle Rotor Model (PRM) with axially symmetric core. The experimental branching ratios, $B (M1) B (E2)$ values and mixing ratios of the transitions in the yrast band are well reproduced by PRM, assuming an axial oblate core. A cranked shell model calculation has been carried out for the proposed bands.
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].
Pseudo-spin flip in doubly decoupled structures and identical bands
1995, Nuclear Physics, Section A
Unfavored components of doubly decoupled bands are reported for the first time. They can be interpreted as having the pseudo-spin flipped relative to the orientation in the favored components, i.e. antialigned with respect to the rotation axis. In addition, the differences in consecutive transition energies along the favored and unfavored sequences are strikingly similar among them up to I^π = 15⁺and 14⁺ respectively. This feature arises from a cancellation of differences in alignments and moments of inertia.
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1994, Nuclear Physics, Section A
After presenting an overview of the pseudo-symplectic model, the theory is used to investigate the properties of characteristic rotational nuclei of the rare-earth (¹⁶⁰Dy, ¹⁶⁸Er) and actinide (^234,236,238U) regions. Calculated eigenstate energies, static quadrupole moments, and reduced E2-transition matrix elements are compared to the results of other models (IBM and GCM) and the experimental data. Limiting features of the current version of the pseudo-symplectic theory, such as assumptions regarding the role of intruder-level particles, are discussed.
Pseudo-spin alignment in rotational structures of doubly odd nuclei and identical bands
1993, Nuclear Physics, Section A

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^☆: This work was supported in part by CONICET, Argentina and the NSF, USA under contract no. INT-81-19006.

¹: Fellows of the CONICET, Argentina.

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A = 184

Oblate bands in doubly odd <sup>134</sup>La

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

Pseudo-spin flip in doubly decoupled structures and identical bands

Investigations of rotational nuclei via the pseudo-symplectic model

Pseudo-spin alignment in rotational structures of doubly odd nuclei and identical bands

Band structure of 184Ir☆

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Band structure of ¹⁸⁴Ir☆