Structure of the collective bands in the 185Au nucleus

doi:10.1016/0375-9474(79)90577-3

Nuclear Physics A

Volume 313, Issues 1–2, January 1979, Pages 221-235

https://doi.org/10.1016/0375-9474(79)90577-3 Get rights and content

Abstract

High-spin levels in ¹⁸⁵Au have been populated via the ¹⁷⁵Lu(¹⁶O, 6n), ¹⁷⁰Yb(¹⁹F, 4n) and ¹⁶⁵Ho(²⁴Mg, 4n) reactions. Rotation-aligned bands built on proton states originating from the $h_{112}$ , $h_{92}$ and $i_{132}$ sub-shells have been identified. These collective structures ar interpreted within the framework of the “quasiparticle + triaxial rotor” model of Meyer-ter-Vehn. A more realistic model has also been used which couples all the quasiparticle states lying near the Fermi surface with an axially symmetric soft core, the Coriolis interaction being exactly solved.

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Evaluated spectroscopic data for all nuclei with mass number A = 185 are presented together with the relevant level schemes from radioactive decay and nuclear reaction studies. This evaluation contains new data for ¹⁸⁵Ta, ¹⁸⁵Re, ¹⁸⁵Os and ¹⁸⁵Tl from heavy ion experiments, and data for ¹⁸⁵Tl, ¹⁸⁵Pb and ¹⁸⁵Bi from α-decay work. The re-analyzed result of ¹⁸⁵Pt level structure from ¹⁸⁵Au ɛ-decay is also included. The present evaluation supersedes the earlier one by E. Browne (1995Br04), published in Nuclear Data Sheets 74, 165 (1995).
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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.
Nuclear data sheets update for A = 185
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Evaluated spectroscopic data for all nuclei with mass number A=185 are presented together with the relevant level schemes from radioactive decay and nuclear reaction studies. A recent observation (92Sc01) of pure E0 transitions in ¹⁸⁵Pt (which are rare in odd-A nuclei) constitutes new evidence for the coexistence of prolate and near spherical shapes in this nucleus. All new, as well as, revised data have been incorporated into the ENSDF file; please note, however, that data sets which are not published here may, nevertheless, have been revised in the current ENSDF file. This publication for A=185 may be used jointly with the previous (full) publication (E. Browne, Nuclear Data Sheets58, 441 (1989) (89Br28), cutoff date September 1988).
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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.
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1989, Nuclear Data Sheets
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Structure of the collective bands in the 185Au nucleus

Abstract

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Structure of the collective bands in the ¹⁸⁵Au nucleus