Projected shell model study for the yrast-band structure of the proton-rich mass-80 nuclei

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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“…Figs. 34 [105][106][107] are of comparable quality. Other quantities as transition quadrupole moments are also very well accounted for.…”

Section: Pure Isovector Pairingmentioning

confidence: 96%

“…Sun et al [103][104][105][106][107] used the Projected Shell Model (PSM, see Section 2.5) to study the rotational excitations in N ≈ Z nuclei. Their PSM only includes like-particle isovector pairing, i. e. it provides a description of the relative energies for states of the same isospin.…”

Section: Pure Isovector Pairingmentioning

confidence: 99%

Overview of neutron–proton pairing

Frauendorf

Macchiavelli

2014

Progress in Particle and Nuclear Physics

187

179

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“…For odd-odd nuclei, the TPSM basis space consists of one-neutron plus oneproton quasiparticle configurations [19,20] :…”

Section: Triaxial Projected Shell Model Approachmentioning

confidence: 99%

Investigation of doublet-bands in 124,126,130,132Cs odd–odd nuclei using triaxial projected shell model approach

et al. 2014

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Doublet bands observed in 124,126,130,132 Cs isotopes are studied using the recently developed multi-quasiparticle microscopic triaxial projected shell model (TPSM) approach. It is shown that TPSM results for energies and transition probabilities are in good agreement with known energies and the recently measured extensive data on transition probabilities for the bands in 126 Cs. In particular, it is demonstrated that characteristics transition probabilities expected for the doublet bands to originate from the chiral symmetry breaking are well reproduced in the present work. The calculated energies for 124,130,132 Cs are also shown to be in reasonable agreement with the available experimental data. Furthermore, a complete set of the calculated transition probabilities is provided for the doublet bands in 124,130,132 Cs isotopes.

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“…This delay in alignment in Z = N nuclei is possibly due to the residual neutron-proton (np) interaction [26] which is not included in our model. However, a projected shell model calculation [9] with enhanced neutron-proton residual interaction suggests that the np interaction is only important in the vicinity of the alignment frequency, and therefore has no significant influence on our prediction on deformations at high rotational frequency.…”

Section: Calculations and Discussionmentioning

confidence: 73%

“…For more collective Z, N 44 nuclei, the evolution in collectivity, strong shape-driving effect from g 9/2 orbit and residual proton-neutron interaction act together, resulting in various interesting phenomena in this mass region, such as superdeformation in 84 Zr [1], γ-vibrations in 80,82 Sr [5,6] and delayed alignment in 84 Mo and 80 Zr [7,8]. Experimentally, with the development of γ-ray detectors, the measurement of high spin states in 84,86 Mo [7,9,10] makes it possible to test detailed theoretical calculations concerning their deformations.…”

Section: Introductionmentioning

confidence: 99%

Shape change induced by g 9/2 rotational alignment in 84,86Mo

Liu

Shi

Fang

2011

Sci. China Phys. Mech. Astron.

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Neutron-deficient Z ≈ N nuclei 84,86 Mo have been investigated using pairing-deformation self-consistent cranked shell model calculations up to spin I > 20 . Our calculations are in good agreement with the experimental data, indicating γ-soft triaxial shapes at low rotational frequency and well-deformed triaxial-oblate shapes at high rotational frequency for both nuclei. The shape change is due to the alignments of the g 9/2 protons and g 9/2 neutrons.shape change, cranked shell model, molybdenum

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Projected shell model study for the yrast-band structure of the proton-rich mass-80 nuclei

Cited by 51 publications

References 41 publications

Overview of neutron–proton pairing

Overview of neutron–proton pairing

Investigation of doublet-bands in 124,126,130,132Cs odd–odd nuclei using triaxial projected shell model approach

Shape change induced by g 9/2 rotational alignment in 84,86Mo

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