Wobbling excitations in strongly deformed Hf nuclei?

Hartley, D. J.; Djongolov, M.; Riedinger, L. L.; Hagemann, G.B.; Janssens, R. V. F.; Kondev, F. G.; Moore, E. F.; Riley, M. A.; Aguilar, A.; Bingham, C. R.; Campbell, D. B.; Carpenter, M. P.; Chowdhury, P.; Cromaz, M.; Cullen, D. M.; Danchev, M.; Dracoulis, George; Fallon, P.; Goon, J. Tm.; Kaye, R. A.; Khoo, T. L.; Laird, R. W.; Lauritsen, T.; Macchiavelli, A. O.; McClain, B.; Mukherjee, G.; Ngijoi-Yogo, E.; Park, H. I.; Sletten, G.; Tandel, S. K.; Walker, P. M.; Zhang, Jing Ye

doi:10.1016/j.physletb.2005.01.007

Cited by 33 publications

(16 citation statements)

References 30 publications

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“…In the neighboring Hf (Z = 72) isotopes, evidences for TSD bands have also been presented [44][45][46][47]. The cranking formalism has predicted pronounced minima around (ε 2 ,γ ) ∼ (0.4,20 • ) which are caused by shell gaps for proton numbers Z = 71 and 72, and neutron numbers N = 94 and 97 [40,48].…”

Section: E Tsd Bandsmentioning

confidence: 94%

Interpretation of the high spin states inLu161: A paired and unpaired study

Carlsson

Ragnarsson

et al. 2014

Phys. Rev. C

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A paired cranked Nilsson-Strutinsky-Bogoliubov (CNSB) model is presented, which employs the same method to calculate the liquid-drop energy and moment of inertia as the unpaired cranked Nilsson-Strutinsky (CNS) model. In the CNSB model, the energy minimization is carried out in the mesh of pairing gaps and Fermi levels λ as well as deformation parameters. The high spin states in 161 Lu are then investigated with the CNSB and CNS models. The terminating structure shows a striking similarity with these two models. Combining the CNSB and CNS models, a complete understanding of high spin structures, including the normal deformed (ND) and triaxial strongly deformed (TSD) bands and observed side bands in 161 Lu, is achieved. It appears that the only important paired crossings are the first i 13/2 neutron crossing and the first h 11/2 proton crossing. For the description of the unpaired high spin crossings, it is important to be able to distinguish between the pseudospin partners in the proton N = 4 shell, (d 5/2 ,g 7/2 ) and (d 3/2 ,s 1/2 ). The yrast bands are predicted to terminate, which explains the structure of a TSD-like band X2. A band crossing at I ≈ 36.5 for the TSD band in 161 Lu, unique within the chain of even-N Lu isotopes, is well described by the CNSB model.

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Section: E Tsd Bandsmentioning

confidence: 94%

Interpretation of the high spin states inLu161: A paired and unpaired study

Carlsson

Ragnarsson

et al. 2014

Phys. Rev. C

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“…The second study involved the investigation of candidate superdeformed triaxial bands in 174 Hf [17]. The measurement of quadrupole moments confirms the large deformation of the four previously known SD bands in 174 Hf.…”

Section: Discussionmentioning

confidence: 68%

“…In addition, a high-statistics, thin-target experiment was run to search for linking transitions between the SD bands to provide evidence that some of the bands may be associated with wobbling excitations. The experimental details of these experiments can be found in [17].…”

Section: The Search For Wobbling Excitations In Strongly Deformed 174 Hfmentioning

confidence: 99%

“…The experimental fractional Doppler shift was extracted from a centroid shift analysis [17]. In order to determine the quadrupole moment Q t , computer simulations of the actual decay of the levels with the bands and their sidefeeding were performed with the code FITFTAU [19].…”

Section: The Search For Wobbling Excitations In Strongly Deformed 174 Hfmentioning

confidence: 99%

“…In addition, it was not possible to link any of the eight SD bands to the normal deformed states. However, the fact that SD 1 is isospectral with the SD band in 175 Hf [20] (which has been linked to known states) has allowed us to conclude that the bands in 174 Hf are likely based on six or eight quasiparticles [17]. Therefore, the SD structures in the Hf nuclei seem to be part of a different 'class' of SD bands than the Lu TSD sequences.…”

Section: The Search For Wobbling Excitations In Strongly Deformed 174 Hfmentioning

confidence: 99%

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Beyond band termination in¹⁵⁷Er and the search for wobbling excitations in strongly deformed¹⁷⁴Hf

Riley

Djongolov

Evans

et al. 2005

J. Phys. G: Nucl. Part. Phys.

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High-spin terminating bands in heavy nuclei were first identified in nuclei around 158 Er 90 . While examples of special terminating states have been identified in a number of erbium isotopes, almost nothing is known about the states lying beyond band termination. In the present work the high-spin structure of 157 Er has been studied using the Gammasphere spectrometer.The subject of triaxial superdeformation and 'wobbling' modes in Lu nuclei has rightly attracted a great deal of attention. Very recently, four strongly or superdeformed (SD) sequences have been observed in 174 Hf and ultimate cranker calculations predict such structures may have significant triaxial deformation. We have performed two experiments in an attempt to

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