Relative Deformations of Superdeformed Bands in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mn>3</mml:mn><mml:mn>1</mml:mn><mml:mo>,</mml:mo><mml:mn>1</mml:mn><mml:mn>3</mml:mn><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>Ce</mml:mi></mml:math>

Clark, R. M.; Lee, I Y; Fallon, P.; Joss, D. T.; Asztalos, S. J.; Becker, J. A.; Bernstein, L. A.; Cederwall, B.; Deleplanque, M. A.; Diamond, R. M.; Farris, L. P.; Hauschild, K.; Kelly, W.H.; Macchiavelli, A. O.; Nolan, P. J.; O’Brien, N. J.; Semple, A. T.; Stephens, F. S.; Wadsworth, R.

doi:10.1103/physrevlett.76.3510

Cited by 60 publications

(16 citation statements)

References 11 publications

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“…These conclusions are supported by calculations of transition quadrupole moments, g factors, and pairing gaps. A recent experiment [28] shows that the quadrupole moments in the SD bands in 132 Ce and 131 Ce are nearly the same, even though these bands have different numbers of high-j quasiparticles. This observation strongly supports our conclusion in this paper and contradicts the predictions of cranked Woods-Saxon calculations [29].…”

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confidence: 93%

Systematic Description of Yrast Superdeformed Bands in Even-Even Nuclei of the Mass-190 Region

1997

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Yrast superdeformed bands for even-even nuclei of the mass-190 region are described by the projected shell model. Excellent agreement with available data for all isotopes is obtained. Our calculation of electromagnetic properties and pairing correlations provides a microscopic understanding of the observed gradual increase of dynamical moments of inertia with angular momentum in this mass region and suggests that for superdeformation it is not very meaningful to distinguish between Coriolis antipairing and gradual high-j orbital alignment. [S0031-9007(97)02692-6] PACS numbers: 21.10. Re, 21.30.Fe, 21.60.Cs, 27.80. + w A slowly rotating nuclear system can often be characterized by a fixed deformation with pairing correlation among nucleons. As the system rotates more rapidly, these 2 degrees of freedom will be modified by the rotation. Three simple consequences may be identified: (1) the nuclear deformation can vary during the rotation, a phenomenon known as the stretching effect [1]; (2) the Coriolis antipairing effect (CAP) [2], which is caused by the weakening pairing correlations across many orbitals due to the Coriolis force; and (3) rotation alignment [3], which emphasizes an alignment along the rotation axis of a pair in an orbital particularly susceptible to the Coriolis effect. All these effects can lead to a variation in moment of inertia (MoI).Generally, all of these effects may be expected in rotating nuclear systems, but in special cases one of them may dominate. For example, in rare-earth nuclei the observed sudden enhancement in the MoI associated with a backbend is typically dominated by rotation alignment of a nucleon pair from a high-j and low-V orbital [3], with CAP and stretching effects playing less important roles. However, for situations where the variation in the MoI is gradual, the measured g-ray energies are often not sufficient to distinguish the effects that change the MoI. Additional measurements of transition quadrupole moments, g factors, or nucleon pair transfer reactions can provide information to disentangle these contributions, but these are more difficult than energy measurements.The situation for superdeformed (SD) nuclei is less clear. In the SD nuclei of the mass-190 region, both kinematical ͑J ͑1͒ ͒ and dynamical ͑J ͑2͒ ͒ MoI for most SD bands exhibit a gradual increase as a function of increasing rotational frequency, with a more pronounced increase in J ͑2͒ . Thus, even though these are among the most deformed nuclei, they exhibit substantial deviation from rigid rotor behavior as the angular momentum increases. The usual understanding is that this behavior is caused by a gradual rotation alignment of pairs from high-j intruder orbitals [4]. There have been several approaches to the detailed calculation of SD bands and their properties [5][6][7][8][9][10][11][12]. Although these differ in particulars, a common feature is that the rotational degree of freedom is described by the cranking method. Thus no electromagnetic transition probabilities as a function of angular momen...

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confidence: 93%

Systematic Description of Yrast Superdeformed Bands in Even-Even Nuclei of the Mass-190 Region

1997

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“…The deformation of the second well is then increasing with increasing mass, reaching ε ≈ 0.45 in the recently discovered SD band in 140 Nd [20] and coming close to ε ≈ 0.6 (corresponding to a nuclear axis ratio of 2:1) at the upper end near A = 150; see, e.g., the quadrupole moments deduced for the SD bands of Dy and Gd nuclei in Refs. [21][22][23][24].…”

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confidence: 99%

Evolution from spherical single-particle structure to stable triaxiality at high spins inNd140

Petrache¹,

Fantuzi²,

LoBianco³

et al. 2005

Phys. Rev. C

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The level structure of 140 60 Nd 80 has been established up to spin 48 by in-beam γ -ray spectroscopy by use of the 96 Zr( 48 Ca, 4n) reaction. High-fold γ -ray coincidences were measured with the EUROBALL spectrometer. Twelve new rotational bands have been discovered at high spins. They are interpreted as being formed in a deep triaxial minimum at ε 2 ≈ 0.25 and γ ≈ 35 • . Possible configurations are assigned to the observed bands on the basis of configuration-dependent cranked Nilsson-Strutinsky calculations.

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“…Furthermore, in the mass-130 region, the superdeformed (SD) bands observed in Ce nuclei [15][16][17] originate from neutron excitations across the N = 82 shell gap into h 9/2 and i 13/2 orbitals, coupled to the proton 2p-2h excitation mentioned above [18]. Deformation parameters ǫ 2 ≃ 0.4 have been determined for these SD bands [19].…”

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confidence: 99%

Highly deformed high-spin band in125I

et al. 2011

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High-spin states in125 I have been investigated using the reaction 82 Se( 48 Ca,p4n) at a beam energy of 200 MeV and γ-ray coincidence events were detected using the Gammasphere spectrometer. A deformed rotational band, extending up to I π = 95/2 − , was observed for the first time in a heavier odd-A iodine nucleus. The characteristics of the band are very similar to those of the highly deformed bands observed recently in neighboring nuclei and it is 'identical' to one of the previously known bands in 126 Xe. The experimental results are compared to Cranked Nilsson-Strutinsky calculations and possible configurations for the band are discussed.

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Relative Deformations of Superdeformed Bands in131,132Ce

Cited by 60 publications

References 11 publications

Systematic Description of Yrast Superdeformed Bands in Even-Even Nuclei of the Mass-190 Region

Systematic Description of Yrast Superdeformed Bands in Even-Even Nuclei of the Mass-190 Region

Evolution from spherical single-particle structure to stable triaxiality at high spins inNd140

Highly deformed high-spin band in125I

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