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Fischer, S. M.; Lister, C. J.; Balamuth, D. P.; Bauer, R.; Becker, J. A.; Bernstein, L. A.; Carpenter, M. P.; Durell, J. L.; Fotiades, N.; Freeman, S. J.; Garrett, P. E.; Hausladen, P. A.; Janssens, R. V. F.; Jenkins, D. G.; Leddy, M. J.; Ressler, J. J.; Schwartz, J.; Svelnys, D.; Sarantites, D. G.; Seweryniak, D.; Varley, B. J.; Wyss, R.

doi:10.1103/physrevlett.87.132501

Cited by 82 publications

(46 citation statements)

References 27 publications

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“…We find that ε 2 = +0.475 for 80 Zr, ε 2 = −0.175 for 82 Zr, and ε 2 = −0.200 for 84 Zr. These values are consistent with the experimental data: a strongly prolate shape β 2 > +0.4 for 80 Zr [50], |β 2 | ≈ 0.3 for 82 Zr [18], and |β 2 | ≈ 0.2 for 84 Zr [19]. There is a link between the two quadrupole deformation parameters ε 2 and β 2 , β 2 ≈ 0.95ε 2 [49].…”

Section: A Single-particle Levels and Ground-state Potential Energy supporting

confidence: 89%

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Microscopic description of nuclear structure aroundZr80

Zou

Tian

et al. 2010

Phys. Rev. C

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A new approach for the calculation of angular momentum projected potential energy surfaces (AMPPESs) is proposed which combines the projected shell model with a quadrupole constrained relativistic Hartree-Bogoliubov (RHB) theory in which the NL3 effective interaction is chosen for the relativistic mean-field effective Lagrangian and a separable Gogny D1S interaction for the pairing force (QCRHB-NL3 + separable Gogny D1S force theory). We apply this approach to compute the AMPPESs of 80,82,84 Zr nuclei up to high spins and investigate the spin-induced shape transitions and decay out of the superdeformed (SD) bands in these nuclei. We find that the shape transitions occur in 80 Zr and 84 Zr, which are driven by the rotational alignments of the nucleons in the 1g 9/2 orbitals, and a strong shape mixing happens in 82 Zr. Moreover, it is shown that the barrier separating the SD states and normal deformed (or spherical) states becomes lower and narrower for 82 Zr and 84 Zr at high spins, indicating that the decay out of the SD bands could occur at high spins. For 80 Zr, however, there is no decay out of the SD band because the barrier is so high and thick. Meanwhile, the QCRHB-NL3 + separable Gogny D1S force theory is employed to calculate the ground-state potential energy surfaces and the single-particle levels of these nuclei, which in turn are used to determine and analyze the equilibrium shapes and discuss the shape coexistence of these nuclei. In addition, this theory is compared with other state-of-the-art mean-field theories to justify its use to study the ground-state potential energy surfaces of 80,82,84 Zr.

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Section: A Single-particle Levels and Ground-state Potential Energy supporting

confidence: 89%

“…3. Experimental data clearly show that the first rotational alignment begins at I = 12 for 82 Zr [18], I = 10 for 84 Zr [19], and a higher spin for 80 Zr [50]. Therefore, it is understood that the rotation alignments induce the shape transitions in 80,84 Zr nuclei.…”

Section: Amppess Shape Transitions and Decay Out Of The Sd Bandsmentioning

confidence: 95%

Microscopic description of nuclear structure aroundZr80

Zou

Tian

et al. 2010

Phys. Rev. C

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“…Based on their experiments, de Angelis et al [121], Fisher et al [127], and Mȃrginean et al [128] (and previous work cited therein) suggested a delay of the crossing between the g-band and s-band in the N = Z=36, 38,40,42, 44 nuclides as compared to the N = Z + 2 isotopes. These results initiated several theoretical studies.…”

Section: Pure Isovector Pairingmentioning

confidence: 94%

“…After the year 2000, the rotational response of N ≈ Z nuclei was investigated in a number of experimental papers [127][128][129][130][131][132][133][134][135][136][137][138]. Afanasjev , Frauendorf and Ragnarsson [139,140], interpreted the rotational bands of the nuclides with A = 58 − 80 in a systematic way, where E 0 (ω, C) was calculated by means of cranked relativistic Hartree+Boguljubov (CRHB) [141].…”

Section: Pure Isovector Pairingmentioning

confidence: 99%

Overview of neutron–proton pairing

Frauendorf

Macchiavelli

2014

Progress in Particle and Nuclear Physics

188

179

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The role of neutron-proton pairing correlations on the structure of nuclei along the N = Z line is reviewed. Particular emphasis is placed on the competition between isovector (T = 1) and isoscalar (T = 0) pair fields. The expected properties of these systems, in terms of pairing collective motion, are assessed by different theoretical frameworks including schematic models, realistic Shell Model and mean field approaches. The results are contrasted with experimental data with the goal of establishing clear signals for the existence of neutron-proton (np) condensates. We will show that there is clear evidence for an isovector np condensate as expected from isospin invariance. However, and contrary to early expectations, a condensate of deuteron-like pairs appears quite elusive and pairing collectivity in the T = 0 channel may only show in the form of a phonon. Arguments are presented for the use of direct reactions, adding or removing an np pair, as the most promising tool to provide a definite answer to this intriguing question.

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“…This type of correlations may also be, in principle, visible through changes in structure of rotational nuclear bands. For example, the significance of the so-called delayed alignments in N =Z nuclei is at present intensely investigated, both experimentally [2,3] and theoretically, e.g., see recent Refs. [4][5][6][7][8] and references cited therein.…”

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confidence: 99%

T=0neutron-proton pairing correlations in the superdeformed rotational bands around60Zn

Dobaczewski

Dudek

Wyss³

2003

Phys. Rev. C

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The superdeformed bands in 58 Cu, 59 Cu, 60 Zn, and 61 Zn are analyzed within the frameworks of the Skyrme-Hartree-Fock as well as Strutinsky-Woods-Saxon total routhian surface methods with and without the T =1 pairing correlations. It is shown that a consistent description within these standard approaches cannot be achieved. A T =0 neutron-proton pairing configuration mixing of signature-separated bands in 60 Zn is suggested as a possible solution to the problem.

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Alignment Delays in theN=ZNucleiK72

Cited by 82 publications

References 27 publications

Microscopic description of nuclear structure aroundZr80

Microscopic description of nuclear structure aroundZr80

Overview of neutron–proton pairing

T=0neutron-proton pairing correlations in the superdeformed rotational bands around60Zn

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