Ultrahigh-spin spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Er</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>159</mml:mn><mml:mo>,</mml:mo><mml:mn>160</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>: Observation of triaxial strongly deformed structures

Ollier, J.; Simpson, John; Wang, X.; Riley, M. A.; Aguilar, A.; Teal, C.; Paul, E. S.; Nolan, P. J.; Petri, M.; Rigby, S. V.; Thomson, James A.; Unsworth, C.; Carpenter, M. P.; Janssens, R. V. F.; Kondev, F. G.; Lauritsen, T.; Zhu, S.; Hartley, D. J.; Darby, I. G.; Ragnarsson, I.

doi:10.1103/physrevc.80.064322

Cited by 22 publications

(24 citation statements)

References 34 publications

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“…Bands with similar characteristics were observed in the present experiment for 159 Er and 160 Er [20]. These bands have been compared with CNS calculations and interpreted as triaxial strongly deformed (TSD) structures [20] ε 2 ∼ 0.37 and γ ∼ ±20 • . The possible TSD band associated with 159 Er is labeled TSD 1 in Fig.…”

Section: E Triaxial Bandssupporting

confidence: 51%

“…Good agreement between experiment and theory is observed for the competition of the prolate-collective and band-terminating sequences in the I = 30 − 50h region. The present experiment has also identified a band with a high moment of inertia, which is discussed in terms of a strongly deformed triaxial structure [20]. The lifetimes of states within similar structures in 157,158 Er [16] indicate discrepancies between the experimentally deduced and the predicted triaxial shape.…”

Section: Introductionmentioning

confidence: 72%

“…Comparison with results from cranked Nilsson-Strutinsky (CNS) calculations suggest that these collective rotational sequences are based on triaxial strongly deformed (TSD) shapes, although uncertainties persist as to the exact value of the gamma deformation [16]. A number of similar collective structures with characteristic high moments of inertia have now been observed in several neighboring nuclei [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Diverse collective excitations in159Erup to high spin

Mustafa¹,

Ollier²,

Simpson³

et al. 2011

Phys. Rev. C

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A spectroscopic investigation of the γ decays from excited states in 159 Er has been performed in order to study the changing structural properties exhibited as ultrahigh spins (I > 60h) are approached. The nucleus 159 Er was populated by the reaction 116 Cd( 48 Ca,5nγ) at a beam energy of 215 MeV and the resulting γ decays were studied using the Gammasphere spectrometer. New rotational bands and extensions to existing sequences were observed, which are discussed in terms of the cranked shell model, revealing a diverse range of quasiparticle configurations. At spins around 50h there is evidence for a change from dominant prolate collective motion at the yrast line to oblate non-collective structures via the mechanism of band termination. A possible strongly deformed triaxial band occurs at these high spins, which indicates collectivity beyond 50h. The high spin data are interpreted within the framework of cranked Nilsson-Strutinsky calculations.

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Section: E Triaxial Bandssupporting

confidence: 51%

Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diverse collective excitations in159Erup to high spin

Mustafa¹,

Ollier²,

Simpson³

et al. 2011

Phys. Rev. C

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“…Of particular interest are the bands recently observed at ultrahigh spins in the A ∼ 154 − 160 mass region. These are the bands seen in 154 Er [10], 157,158,159,160 Er [11][12][13][14][15], 157 Ho [12], and 160 Yb [16]. As discussed below, the interpretation of these structures is still under debate.…”

mentioning

confidence: 99%

“…Note, however, that DFT calculations yield γ−deformations that are typically smaller in absolute value than the ones obtained in CNS.) The early interpretation of observed TSD bands have invoked configurations built either upon the TSD1 minimum [10,11] or TSD1 and/or TSD2 minima [13].…”

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confidence: 99%

Description of158Er at ultrahigh spin in nuclear density functional theory

2012

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Rotational bands in 158 Er at ultra-high spin have been studied in the framework of relativistic and non-relativistic nuclear density functional theories. Consistent results are obtained across the theoretical models used but some puzzles remain when confronted with experiment. Namely, the many-body configurations which provide good description of experimental transition quadrupole moments and dynamic moments of inertia require substantial increase of the spins of observed bands as compared with experimental estimates, which are still subject to large uncertainties. If, however, the theoretical spins assignments turned out to be correct, the experimental band 1 in 158 Er would be the highest-spin structure ever observed.

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The Fascinating $$\gamma $$-Ray World of the Atomic Nucleus: The Evolution of Nuclear Structure in $$^{158}\mathrm{{Er}}$$ and the Future of $$\gamma $$-Ray Spectroscopy

Riley

2013

Exciting Interdisciplinary Physics

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Ultrahigh-spin spectroscopy ofEr159,160: Observation of triaxial strongly deformed structures

Cited by 22 publications

References 34 publications

Diverse collective excitations in159Erup to high spin

Diverse collective excitations in159Erup to high spin

Description of158Er at ultrahigh spin in nuclear density functional theory

The Fascinating $$\gamma $$-Ray World of the Atomic Nucleus: The Evolution of Nuclear Structure in $$^{158}\mathrm{{Er}}$$ and the Future of $$\gamma $$-Ray Spectroscopy

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