First evidence for triaxial superdeformation in 168Hf

Amro, H.; Varmette, P. G.; Ma, Wenchao; Herskind, B.; Hagemann, G.B.; Sletten, G.; Janssens, R. V. F.; Bergström, M.; Bracco, A.; Carpenter, M. P.; Domscheit, J.; Frattini, S.; Hartley, D. J.; Hübel, H.; Khoo, T. L.; Kondev, F. G.; Lauritsen, T.; Lister, C. J.; Million, B.; Ødegård, S. W.; Piercey, R. B.; Riedinger, L. L.; Schmidt, K. A.; Siem, S.; Wiedenhöver, I.; Wilson, J. N.; Winger, J. A.

doi:10.1016/s0370-2693(01)00369-0

Cited by 49 publications

(25 citation statements)

References 20 publications

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“…3(b), which indicates that the TSD bands have larger deformation than the ND band. The J (2) values are close to those of the TSD bands in 168 Hf where the transition quadrupole moment of band TSD1 has been measured to be Q t ≈ 11.4 e b [17], which is substantially larger than Q t ≈ 6.4 e b for the ND yrast band [18].…”

supporting

confidence: 75%

Identification of triaxial strongly deformed bands in164Hf

Marsh

Hagemann³

et al. 2013

Phys. Rev. C

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supporting

confidence: 75%

Identification of triaxial strongly deformed bands in164Hf

Marsh

Hagemann³

et al. 2013

Phys. Rev. C

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“…2. The J (2) values are close to those of the TSD bands in 168 Hf, indicating that all these TSD bands have similar large deformations, where the measured value of quadrupole moment is Q t ≈ 11.4 e b in 168 Hf [22]. Based on these properties, bands TSD1 and TSD2 are proposed to be the long-anticipated TSD bands in 164 Hf.…”

supporting

confidence: 53%

“…Thus far, only two weak TSD bands were reported in 168 Hf 96 [22,23], however, neither structure appears to result from the wobbling mode. Thus, a wobbling excitation has yet to be observed in an even-even nucleus even though Bohr and Mottelson first discussed wobbling for such a system [24].…”

mentioning

confidence: 99%

Triaxial strongly deformed structures in the even-even Hf nuclei

2014

EPJ Web of Conferences

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Abstract. Two rotational bands of distinct character have been identified in 164 Hf from a recent experiment at Gammasphere. They are suggested to correspond to the longanticipated triaxial strongly deformed (TSD) bands predicted by theoretical studies. The bands are substantially stronger in intensity and are located at lower spins than the previously observed TSD bands in 168 Hf, and have been linked to the known states, hereby making 164 Hf the best even-even system for the study of TSD structures in the A ∼ 160 mass region. Cranking calculations based on the modified-oscillator model suggest that the bands are associated with four-quasiparticle configurations involving high-j intruder (i 13/2 ) 2 proton orbitals. Wobbling mode has not been observed in 164 Hf and the possible reasons are discussed.Collective motion associated with triaxial deformed nuclei has been a subject of much interests. Over the past decade, such type of motion has been identified in several mass regions, e.g., the chiral doublet bands in nuclei around 133 [12]. These findings have been investigated extensively with different theoretical approaches -see, e.g., Refs. [12][13][14][15][16]. In some of the early theoretical studies, Bengtsson and coworkers suggested that TSD minima associated with deformation parameters (ε 2 , γ) ∼ (0.4, ±20• ) in the total energy surfaces (PES) are stabilized by large single-particle shell gaps present at proton numbers Z = 71 and 72 and neutron numbers N = 94 and 97 [17,18]. The calculations were based on a cranked, modified-oscillator model [19]. However, it has proved to be a considerable challenge to predict the behavior of TSD bands in specific nuclei, even those differing by only a single nucleon from the well-studied cases above.While the observed TSD bands in the Z = 71 Lu isotopes and N = 94 isotones are consistent with the calculated TSD shell gaps, experimental searches in both 166 72 Hf 94 [20] and 169 Hf 97 [21] failed to uncover any TSD structure. Thus far, only two weak TSD bands were reported in 168 Hf 96 [22,23], however, neither structure appears to result from the wobbling mode. Thus, a wobbling excitation has yet to be observed in an even-even nucleus even though Bohr and Mottelson first discussed wobbling for such a system [24]. The presence of a significant Z = 72 TSD shell gap also seemed questionable. The quasiparticle excitations in the 168 Hf TSD bands are very different from those associated with the wobbling bands of the odd-A Lu and Ta nuclei. In a comprehensive study of TSD structures a

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“…However, the dynamic moments of inertia are very similar in all these bands, and larger than those of the bands built on the normal deformed (ND) structures. It should be noted that very recently three similar bands were found in 168 Hf and lifetime measurements resulted in a transition quadrupole moment of Q t ഠ 11.4 b [10]. So far, no direct experimental evidence for the triaxiality of the observed 5866 0031-9007͞01͞86(26)͞5866(4)$15.00 © 2001 The American Physical Society triaxial, strongly deformed (TSD) bands has been given, but one possible and unique consequence of a rotating nucleus with a triaxial shape is the existence of "wobbling bands" [2].…”

Section: (Received 26 January 2001)mentioning

confidence: 61%