Single particle excitations and properties of multiple band terminations near spin 50ħ in 158Er

Simpson, John; Riley, M. A.; Gale, S.J.; Sharpey‐Schafer, J. F.; Bentley, M. A.; Bruce, A. M.; Chapman, R.; Clark, R. M.; Clarke, Simon J.; Copnell, J.; Cullen, D. M.; Fallon, P.; Fitzpatrick, Andrew; Forsyth, P.D.; Freeman, S. J.; Jones, P. M.; Joyce, Malcolm J.; Lidén, F.; Lisle, J.C.; Macchiavelli, A. O.; Smith, Andrew; Smith, J. F.; Sweeney, J.; Thompson, D.M.; Warburton, Sarah; Wilson, J. N.; Bengtsson, T.; Ragnarsson, I.

doi:10.1016/0370-2693(94)90716-1

Cited by 75 publications

(19 citation statements)

References 19 publications

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“…The energy difference between experiment and theory for the analogous states in 158 Er, namely the 40 + and 46 + states, was previously discussed in Ref. [52].…”

Section: Strongly-coupled Structuresmentioning

confidence: 91%

“…This phenomenon occurs when the spin vectors of the available valence nucleons outside a closed-shell core, in this case 146 64 Gd 82 , become aligned in pure single-particle configurations [13]. In the N = 90 nucleus 158 Er, such single-particle states are observed at I π = 40 + [1] and 46 + [2] in the yrast (lowest energy for a given spin) band and at 43 − , 48 − and 49 − [14] in the lowest-energy negative-parity sequences. Moreover, rotational sequences have recently been identified that extend into the region of ultrahigh spin (> 60h) [15] and represent a re-emergence of collectivity beyond band termination in 158 Er.…”

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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“…The energy difference between experiment and theory for the analogous states in 158 Er, namely the 40 + and 46 + states, was previously discussed in Ref. [52].…”

Section: Strongly-coupled Structuresmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Diverse collective excitations in159Erup to high spin

Mustafa¹,

Ollier²,

Simpson³

et al. 2011

Phys. Rev. C

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“…High-spin terminating bands [1] in heavy nuclei were first identified in nuclei around 158 68 Er 90 ; see [2][3][4][5] and references therein, also see [6] for a recent summary of the field. At termination, this nucleus can be considered as a spherical core 146 64 Gd 82 plus 12 (4 protons and 8 neutrons) aligned valence particles which can generate a maximum spin of around 46h at an excitation energy of ≈20 MeV, depending on the specific configuration.…”

Section: Beyond Band Termination In 157 Ermentioning

confidence: 99%

“…In 157 Er, the three fully aligned terminating states at 87/2 − , 89/2 − and 93/2 + are formed by coupling the π [(h 11/2 ) 4 ] 16 + proton configuration to the three neutron configurations, 4 ] 61/2 + , respectively. The favoured way to make higher-spin states for I = 45-55h is to excite protons from the g 7/2 and d 5/2 orbitals below the Z = 64 shell gap into the 5th and 6th h 11/2 orbitals and into the two lowest d 3/2 orbitals.…”

Section: Beyond Band Termination In 157 Ermentioning

confidence: 99%

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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“…One typical situation, existing for example in the A ∼ 158 mass region (see Ref. [4] and references therein), is that although the terminating states are seen in experiment, the rotational bands from which they originate go away from the yrast line with decreasing spin and are thus difficult to observe over a large spin range. Another even more common situation is that the rotational bands, which are yrast in some spin range, end up in terminating states residing well above the yrast line.…”

Section: Introductionmentioning

confidence: 99%

Relative properties of smooth terminating bands

Afanasjev

Ragnarsson²

1998

Nuclear Physics A

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Abstract. The relative properties of smooth terminating bands observed in the A ∼ 110 mass region are studied within the effective alignment approach. Theoretical values of i ef f are calculated using the configuration-dependent shell-correction model with the cranked Nilsson potential. Reasonable agreement with experiment shows that previous interpretations of these bands are consistent with the present study. Contrary to the case of superdeformed bands, the effective alignments of these bands deviate significantly from the pure single-particle alignments j x of the corresponding orbitals. This indicates that in the case of smooth terminating bands, the effects associated with changes in equilibrium deformations contribute significantly to the effective alignment.

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Single particle excitations and properties of multiple band terminations near spin 50ħ in 158Er

Cited by 75 publications

References 19 publications

Diverse collective excitations in159Erup to high spin

Diverse collective excitations in159Erup to high spin

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

Relative properties of smooth terminating bands

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Single particle excitations and properties of multiple band terminations near spin 50ħ in 158Er

Cited by 75 publications

References 19 publications

Diverse collective excitations in159Erup to high spin

Diverse collective excitations in159Erup to high spin

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

Relative properties of smooth terminating bands

Contact Info

Product

Resources

About

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