One- and two-phonon wobbling excitations in triaxial 165Lu

Schönwaßer, G.; Hübel, H.; Hagemann, G.B.; Bednarczyk, P.; Benzoni, G.; Bracco, A.; Bringel, P.; Chapman, R.; Curien, D.; Domscheit, J.; Herskind, B.; Jensen, David R.; Leoni, S.; Bianco, G. Lo; Ma, Wenchao; Maj, A.; Neußer, A.; Ødegård, S. W.; Petrache, C. M.; Rossbach, D.; Ryde, H.; Spohr, K.; Singh, A. K.

doi:10.1016/s0370-2693(02)03095-2

Cited by 159 publications

(113 citation statements)

References 21 publications

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“…Their characteristic feature are collective E2 transitions with ∆I = ±1 between these and yrast states. First experimental evidence of such states in odd Lu nuclei was reported only recently [589][590][591][592][593][594].…”

Section: Collective Excitations As Indicator Of Symmetry Breakingmentioning

confidence: 99%

Effects of symmetry breaking in finite quantum systems

2013

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The review considers the peculiarities of symmetry breaking and symmetry transformations and the related physical effects in finite quantum systems. Some types of symmetry in finite systems can be broken only asymptotically. However, with a sufficiently large number of particles, crossover transitions become sharp, so that symmetry breaking happens similarly to that in macroscopic systems. This concerns, in particular, global gauge symmetry breaking, related to Bose-Einstein condensation and superconductivity, or isotropy breaking, related to the generation of quantum vortices, and the stratification in multicomponent mixtures. A special type of symmetry transformation, characteristic only for finite systems, is the change of shape symmetry. These phenomena are illustrated by the examples of several typical mesoscopic systems, such as trapped atoms, quantum dots, atomic nuclei, and metallic grains. The specific features of the review are: (i) the emphasis on the peculiarities of the symmetry breaking in finite mesoscopic systems; (ii) the analysis of common properties of physically different finite quantum systems; (iii) the manifestations of symmetry breaking in the spectra of collective excitations in finite quantum systems. The analysis of these features allows for the better understanding of the intimate relation between the type of symmetry and other physical properties of quantum systems. This also makes it possible to predict new effects by employing the analogies between finite quantum systems of different physical nature.

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Section: Collective Excitations As Indicator Of Symmetry Breakingmentioning

confidence: 99%

Effects of symmetry breaking in finite quantum systems

2013

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“…Subsequently, it has been extensively studied in the triaxial strongly deformed (TSD) region around N = 94, where the wobbling bands have been identified in 161,163,165,167 Lu [9][10][11][12][13][14] and 167 Ta [15]. All wobbling bands in this mass region are based on πi 13/2 configuration.…”

Section: Introductionmentioning

confidence: 99%

Collective Hamiltonian for wobbling modes

et al. 2014

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The simple, longitudinal, and transverse wobblers are systematically studied within the framework of collective Hamiltonian, where the collective potential and mass parameter included are obtained based on the tilted axis cranking approach. Solving the collective Hamiltonian by diagonalization, the energies and the wave functions of the wobbling states are obtained. The obtained results are compared with those by harmonic approximation formula and particle rotor model. The wobbling energies calculated by the collective Hamiltonian are closer to the exact solutions by particle rotor model than harmonic approximation formula. It is confirmed that the wobbling frequency increases with the rotational frequency in simple and longitudinal wobbling motions while decreases in transverse wobbling motion. These variation trends are related to the stiffness of the collective potential in the collective Hamiltonian.

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“…The wobbling excitation mode, an experimental fingerprint for nuclei with stable triaxial shape, was predicted about 40 years ago [1], and has now been identified in 163 Lu [2,3], 165 Lu [4], and 167 Lu [5], possibly in 161 Lu [6], and recently in 167 Ta [7]. In addition, TSD structures based on quasiparticle excitations have also been observed in 163 Lu [8,9], 164 Lu [10], 164 Hf [11], 168 Hf [12,13], and a few neighboring nuclides.…”

Section: Introductionmentioning

confidence: 99%

Toward complete spectroscopy ofLu167

Roux¹,

Ma²,

Hagemann

et al. 2015

Phys. Rev. C

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Excited states in 167 Lu were populated in the 123 Sb( 48 Ca,4n) reaction at 203 MeV and decay γ-rays measured using the Gammasphere spectrometer array. Two triaxial strongly deformed bands were identified previously and interpreted as zero-and one-phonon wobbling excitations. As a result of more extensive band search, the level scheme has been considerably extended to include ten new rotational bands, and some 630 γ-ray transitions. A number of interband linking transitions were revealed, so that all but two bands could be connected with each other. Configurations are proposed for all new bands based on measured observables, with the help of Cranked Shell Model calculations. A γ-ray sequence, previously suggested as a triaxial strongly deformed band based on quasiparticle excitations coexisting with the wobbling excitation in the triaxial potential well, has now been determined to be a signature partner of a coupled band, associated with a normal deformed five-quasiparticle configuration. The possibility for two new bands being associated with triaxial deformation is discussed.

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One- and two-phonon wobbling excitations in triaxial 165Lu

Cited by 159 publications

References 21 publications

Effects of symmetry breaking in finite quantum systems

Effects of symmetry breaking in finite quantum systems

Collective Hamiltonian for wobbling modes

Toward complete spectroscopy ofLu167

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