[en] The level scheme of ¹⁹¹Os has been studied from β-decay of ¹⁹¹Re. Gamma-ray singles spectra, γ-γ and β-γ coincidence spectra were obtained by using high resolution detectors. A total of 82 γ-transitions observed were assigned in the level scheme of ¹⁹¹Os consisting of thirty-six excited states up to 1391.89 keV. The level and γ-ray transition properties are discussed in terms of the Nilsson model combining the information from (d, p), (d, t) reactions and (n, γ) spectroscopies. (author)

[en] This evaluation presents spectroscopic data and level schemes from radioactive decay and nuclear reactions for nuclei with mass number A=191. A salient topic includes the recent experimental results on superdeformed bands observed in ₁₉₁Au, ¹⁹¹Hg, and ¹⁹¹Tl

[en] The proton states in ¹⁸⁷Re, ¹⁸⁹Re, and ¹⁹¹Re have been studied using the (t,α) reaction. Previous assignments for ¹⁸⁷Re are adopted, and assignments in ¹⁸⁹Re are based on characteristic intensity patterns and a previous γ-decay study. The Nilsson orbitals are identified in ¹⁸⁹Re, and possible assignments of these orbitals are suggested for ¹⁹¹Re. It is found that the spectroscopic strengths of low-lying 11/2^- states are much smaller than would be expected for pure hsub(11/2) shell model states but are consistent with values expected for a deformed model. However, the basic Nilsson model does not describe all the features well. The results are compared with the predictions of the Nilsson model with a hexadecapole deformation included. (author)

[en] Proton hole states in ¹⁸⁷Re, ¹⁸⁹Re and ¹⁹¹Re have been studied using the (t(pol),α) reaction. Beams of 17 MeV tritons with a polarization of 0.75 were obtained from the tandem Van de Graaff accelerator at the Los Alamos Scientific Laboratory. The α-particles were detected in a Q3D magnetic spectrometer with a helical-cathode position-sensitive proportional counter. Spectra were recorded up to > 2 MeV excitation energy with a resolution (FWHM) of approximately 20 keV. These measurements exhibit large analyzing powers for transitions to well-known states in the deformed nuclide ¹⁸⁷Re. This is of interest because the only other single-nucleon transfer results on heavy deformed nuclei (in a (d(pol),p) study of tungsten isotopes) showed 'disappointingly small' analyzing powers. The (t(pol),α) analyzing powers were reproduced by DWBA calculations very well. Thus other levels in ¹⁸⁷Re and many states in ¹⁸⁹Re and ¹⁹¹Re could be assigned spins and parities on the basis of angular distributions for the cross sections and analyzing powers. In particular, the present results have made it possible to determine which of the three possible interpretations suggested previously for the structure of ¹⁹¹Re is correct. The results have been interpreted within the framework of the Nilsson model, with pairing and Coriolis mixing corrections included. The energy systematics of single-quasiparticle states are well reproduced by the Nilsson model if a hexadecapole deformation is included in the nuclear potential. Finally, it has been demonstrated that the (t(pol),α) reaction is an extremely useful spectroscopic tool for studies of heavy deformed nuclei. (Auth.)

[en] Level schemes from radioactive decay and reaction studies are presented for all nuclei with mass number A=191. The experimental data have been evaluated, and adopted levels, transitions, and other nuclear properties are given. All data received before Spetember 1979 have been included

[en] The present revision of the nuclear structure properties for the nuclides belonging to the A = 191 mass chain contains many improvements, corrections and additions to the material presented in previous evaluations (1995Br38, Nucl. Data Sheets 74, 611 (1995)). Besides updating many values, and including supplementary data for already known levels, transitions and level schemes, the most noteworthy modifications with respect to the prior evaluation are the first significant level schemes for ¹⁹¹Pb, ¹⁹¹Bi, and ¹⁹¹Po, showing many levels and transitions, mostly derived from (HI,xnγ) work. The first reports for ¹⁹¹At and ¹⁹¹W and the observation of linking transitions from superdeformed levels to normal deformed levels in ¹⁹¹Hg were also included. Most of decay data sets contain many discrepant data; in some cases, normalization is tentative

[en] Full text: A = 193 evaluation, in collaboration with the Sao Paulo group, was submitted to BNL in April 2004. Datasets for the nuclides ¹⁹³Hg to ¹⁹³At have recently been revised taking into account the suggestions of the reviewer. The mass chain was resent on 13 April 2005 to the NNDC for further processing. A = 191 evaluation: data for the nuclides ¹⁹¹Hg to ¹⁹¹At have been evaluated, and the respective datasets have been prepared. A final review is currently being performed. Expected that the ENSDF files for this part of the A = 191 mass chain will be sent for review to the NNDC within the next two weeks. (author)