Configuration dependent pairing from band crossing frequencies

Garrett, J.D.; Hagemann, G.B.; Herskind, B.; Bacelar, J. C. S.; Chapman, R.; Lisle, J.C.; Mo, J.N.; Simcock, A.; Willmott, J.C.; Price, Huw

doi:10.1016/0370-2693(82)90188-5

Cited by 66 publications

(26 citation statements)

References 15 publications

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“…This band head is isomeric and the present data cannot confirm the assignment to 159 Er, therefore this band has not been included in the present level scheme. It is noted that the energies of this band at low spin [25] are similar to those in the same structure observed in 161 Er [36,37].…”

Section: E the Strongly-coupled Bandssupporting

confidence: 66%

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 the Strongly-coupled Bandssupporting

confidence: 66%

Diverse collective excitations in159Erup to high spin

Mustafa¹,

Ollier²,

Simpson³

et al. 2011

Phys. Rev. C

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“…In addition the effect of the hexadecapole deformation has been proposed to be partly responsible of the observed shift between the he) c of bands based on 1/2-[5213 and 7/2 [514] quasineutrons in lSlOs [21], an isotone of tS5Hg. An alternative explanation of this observed shift involves a reduction of pairing-correlation energy for the aligning quasiparticles due to the occupation of orbitals with positive quadrupole moments like the 1/2-[52I] orbital [22]. In summary, teSHg behaves like a good rotor and exhibits the rotational structures involving at hco =0 the Nilsson orbitals lying in the vicinity of the Fermi level for moderately large prolate deformation, namely the 1/2-[521], 7/2-[514] and 9/2 + ~624] orbitals.…”

Section: B(m 1 I --* I-1)/b(e2 I -- I-mentioning

confidence: 96%

Collective structures in185Hg

Hannachi

Bastin

Porquet

et al. 1988

Z. Physik A - Atomic Nuclei

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Excited states of lSSHg have been investigated via the 161Dy(ZSSi, 4n) reaction at 145 MeV. In-beam 7-ray spectroscopic studies have been performed with the "Chfiteau de Cristal" 4rc-multidetector array. A level scheme of t85Hg has been established. Shape coexistence, still present in lSSHg like in the neighbouring Hg isotopes, manifests itself through a weakly populated decoupled band built on the 13/2 § isomer and three stronglycoupled bands built on the prolate 1/2-[521], 7/2-1-514], and 9/2 + [624] Nilsson states.

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“…Garrett et al [8,9]. But a direct test of the underlying microscopic structure of |0 + 2 is required if we are to be completely confident in our interpretation of these states.…”

mentioning

confidence: 99%

Blocking of coupling to the 02 + excitation in 154Gd by the [505]11/2- neutron in 155Gd

et al. 2011

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[3][4][5][6][7] given for the existence of low-lying 0 + states in deformed actinide nuclei that did not have the properties of a β-vibration or of a pairing vibration.Evidence that the [505]11/2 − oblate orbital is associated with reduced pairing was first presented by J.D. Garrett et al. [8,9]. But a direct test of the underlying microscopic structure of |0 + 2 is required if we are to be completely confident in our interpretation of these states. a e-mail: jfss@tlabs.ac.za In many cases the single-particle orbitals dominating the configuration of a nuclear state can be ascertained from its population in direct reactions. However the |0 + 2 levels in N = 90 nuclei are very weakly populated in

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Configuration dependent pairing from band crossing frequencies

Cited by 66 publications

References 15 publications

Diverse collective excitations in159Erup to high spin

Diverse collective excitations in159Erup to high spin

Collective structures in185Hg

Blocking of coupling to the 02 + excitation in 154Gd by the [505]11/2- neutron in 155Gd

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