Study of high-spin states in 181, 182Os

Kutsarova, T.; Lieder, R.M.; Schnare, H.; Hebbinghaus, G.; Balabanski, D. L.; Gast, W.; Krämer–Flecken, A.; Bentley, M. A.; Fallon, P.; Howe, D.; Mokhtar, A. R.; Sharpey‐Schafer, J. F.; Walker, Paul Andreas; Chowdhury, P.; Fabricius, B.; Sletten, G.; Frauendorf, S.

doi:10.1016/0375-9474(94)00819-9

Cited by 48 publications

(26 citation statements)

References 31 publications

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“…A new interest in the "backbending" phenomenon has arisen through a series of experiments in 1990s' [1][2][3][4] for nuclei in the A ≃ 180 region. It is expected that the backbending in this mass region is caused by the three-bands crossing, i.e., the ground (g-), super (s-) and "tilt" (t-) bands [4,5], unlike the backbending caused by the two-bands crossing of the g-and s-bands [6] in light rare-earth nuclei.…”

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confidence: 99%

Wobbling motion in the multi-bands crossing region

Ansari

Horibata

et al. 2000

Physics Letters B

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The backbending in the A=180 mass region is expected to be caused by multi-bands crossing between low-K (g- and s-bands) and high-K bands. % We analyze a mechanism of coupling of these bands in terms of a dynamical treatment for nuclear rotations, i.e., the wobbling motion. The wobbling states are produced through the generator coordinate method after angular momentum projection, in which the intrinsic states are constructed through the 2d-cranked HFB calculations.Comment: 9 pages, 3 PS figures: to appear in Phys.Lett.

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confidence: 99%

Wobbling motion in the multi-bands crossing region

Ansari

Horibata

et al. 2000

Physics Letters B

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“…In contrast to the situation for 2-quasiparticle isomers, there are many new f ν values for 3-quasiparticle isomers [10,11,[16][17][18][19][20][21][22][23][24][25][26][27]. and what appears to be the simplest analysis is now presented.…”

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“…The uppermost data point (f ν = 71, N p N n = 126) is for 185 Ta [11]. Two of the others, illustrated by triangles in the figure, correspond to isomer decays where the 3-quasiparticle configurations are most likely of the 3π (3-quasiproton) and 3ν (3-quasineutron) type, in 181 Ta (21/2) and 181 Os respectively [16,26]. Building on this observation, a different correlated behavior for decay rates from 3ν and 3π configurations has been found: f ν depends on the isomer excitation energy relative to a rigid rotor of the same angular momentum, as illustrated in Figure 2.…”

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Configuration dependence ofK-forbidden transition rates from three-quasiparticle isomers

2010

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“…The results of TAC calculation reproduce the experimental data reasonably well, although the alignment of two-quasineutrons, which occurs at lower frequency than the data, makes the B(M1) too small at highest frequencies. As increasing the rotational frequency, the B(M1)/B(E2) ratio decreases, which is qualitatively understood by the strong-coupling expressions (2) and (3), or by using the asymptotic relations (19) and (20) the ratio can be further written as [31,23],…”

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confidence: 92%

Calculation of strongly-coupled rotational bands in terms of the tilted axis cranking model

Ohtsubo

Shimizu

2003

Nuclear Physics A

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Recently observed strongly-coupled rotational bands associated with the ν [505] IntroductionBohr-Mottelson's strong-coupling model [1] is the first pioneering work which is capable to describe interplay between the collective and the single-particle rotational motions in well-deformed nuclei. It successfully reproduce both the energy spectra and the electromagnetic transition properties of rotational bands in odd nuclei. It is, however, of phenomenological nature since essential quantities like the moment of inertia and the quadrupole moment are model-parameters and are adjusted in comparison with experimental data. One has to combine it with a more microscopic model such as the Nilsson single-particle model. Another drawback of the model is that it is based on the adiabatic assumption of the collective rotation and the application to the high angular momentum regime is not straightforward. The particle-rotor model [1, 2] is a possible means to extend the idea by lifting the adiabatic assumption and including the effect of Coriolis coupling by exact diagonalization, although it is still semi-phenomenological in the sense that the macroscopic "rotor" part is explicitly introduced. Nowadays, fully microscopic approaches are available, for example, the variation after full angular momentum projection base on the generalized mean-field [3] and the projected shell model [4]. However, they are very complicated and lose simplicity of the model. On the other hand, by taking into account the effect of rotation unperturbatively, the mean-field theory has been extended in the rotating frame: The cranking model or the Cranked Shell Model (CSM) [5], which is simple and yet microscopic, has been successfully applied to understand various high-spin phenomena [6] such as backbending of moment of inertia. Recently, this cranking model has been further extended in such a way to include the tilting degrees of freedom of rotation-axis relative to the deformed shape; the Tilted Axis Cranking (TAC) model [7,8,9] (the conventional cranking is called the Principal Axis Cranking (PAC) model, instead), which gives nice interpretations of new types of nuclear rotational motions, e.g. the shears bands [10] and the chiral bands [9,11]. Although these cranking models treat the rotational motion in a semiclassical manner, its simplicity allows us to have a clear physical picture of various collective rotational motions, which are actually a result of the complex nuclear many-body problem.The purpose of the present paper is two folds: The first is to give a clear relationship between the strong-coupling model and the TAC model. The second is to apply the TAC model to the 1

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Study of high-spin states in 181, 182Os

Cited by 48 publications

References 31 publications

Wobbling motion in the multi-bands crossing region

Wobbling motion in the multi-bands crossing region

Configuration dependence ofK-forbidden transition rates from three-quasiparticle isomers

Calculation of strongly-coupled rotational bands in terms of the tilted axis cranking model

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