Jacobi-type transitions in the interacting boson model

Zhang, Y.; Iachello, F.

doi:10.1103/physrevc.95.061304

Cited by 60 publications

(114 citation statements)

References 40 publications

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“…In addition, a fully consistent treatment should include an optical potential also for the pions. More generally, open problems in pion production include the treatment of the width of the ∆ resonance (off-shell effects), the density dependence of the ∆ production cross section in the medium and the pion potentials in the nuclear medium [177,178,179,180,181]. The latter effect, i.e.…”

Section: Meson Productionmentioning

confidence: 99%

“…the inclusion of the pion potential, seems to go in the direction of smaller pion ratios. A global representation of threshold and pion potental effects is given in Fig.31, which display RBUU results [180]. Adopting the NLρ interaction (corresponding to a symmetry energy slope L = 83 MeV), one observes that the charged pion ratio is increased by threshold (Th) effects, reduced by s-wave pion potential (S), increased by p-wave pion potential (P), finally acquiring a slightly larger value (green point, Th + S + P) than obtained without any in-medium effects.…”

Section: Meson Productionmentioning

confidence: 99%

“…Experimental data [176] from the FOPI collaboration are shown as the cyan band. Reprinted from [180], with kind permission of the APS. calculations with or without cluster correlations, for a soft or a stiff parametrization of the symmetry energy, and to a cascade calculation (JAM, black line).…”

Section: Meson Productionmentioning

confidence: 99%

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Collision dynamics at medium and relativistic energies

Colonna

2020

Progress in Particle and Nuclear Physics

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Recent results connected to nuclear collision dynamics, from low up to relativistic energies, are reviewed. Heavy ion reactions offer the unique opportunity to probe the complex nuclear manybody dynamics and to explore, in laboratory experiments, transient states of nuclear matter under several conditions of density, temperature and charge asymmetry. From the theoretical point of view, transport models are an essential tool to undertake these investigations and make a connection betwen the nuclear effective interaction and sensitive observables of experimental interest. In this article, we mainly focus on the description of results of transport models for a selection of reaction mechanisms, also considering comparisons of predictions of different approaches. This analysis can help understanding the impact of the interplay between mean-field and correlation effects, as well as of in-medium effects, on reaction observables, which is an essential point also for extracting information on the nuclear Equation of State. A special emphasis will be given to the review of recent studies aimed at constraining the density behavior of the nuclear symmetry energy. For reactions at medium (Fermi) energies, we will describe light particle and fragment emission mechanisms, together with isospin transport effects. Collective effects characterizing nuclear collision dynamics, such as transverse and elliptic flows, will be discussed for relativistic heavy ion reactions, together with meson production and isotopic ratios.

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Section: Meson Productionmentioning

confidence: 99%

Section: Meson Productionmentioning

confidence: 99%

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Collision dynamics at medium and relativistic energies

Colonna

2020

Progress in Particle and Nuclear Physics

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“…The Hubbard model may also be extended to the spinless case and include the short-range interactions, such as the nearest-neighbor (NN) and nextnearest-neighbor (NNN) ones. Based on the Hubbard model, the interactions between fermions can drive the formation of various long-range orders, with their properties depending crucially on the combined effects of kinetic energy, interactions, lattice geometry and even dimension [14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Emergence of asymmetric fermionic order in interacting birefringent fermions

Wang

2019

Phys. Rev. B

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The birefringent fermions possess a spectrum with two distinct Fermi velocities. Here based on the lattice model, we use the mean-field method to investigate the interaction-induced phase transitions of the birefringent fermions. We consider both the short-range nearest-neighbor (NN) and nextnearest-neighbor (NNN) repulsive interactions and calculate the phase diagrams under different conditions. We find that the NN interactions can induce the asymmetric charge density wave order, while the NNN interactions can drive the asymmetric quantum anomalous Hall order (AQAH) in the large limit of anisotropy in the hopping integrals, β → 1. The AQAH order is characterized by the unequal loop currents connecting the NNN sites and by the appearance of a gap between the two conduction (valence) bands. Such asymmetric fermionic orders can be attributed to the specific lattice geometry of the birefringent fermions. The implications of our results in experiments are also discussed.

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“…As examples we mention van Hove singularity in two-dimensional lattice systems [19,20,21] and quantum monodromy in some molecules [22,23]. Recently, the esqpts have been related to Jacobi-type shape transitions in nuclei within the framework of the algebraic Interacting Boson Model [24]. Another example is the nonHermitian extension of the standard quantum mechanics.…”

Section: Introductionmentioning

confidence: 99%

Excited-state quantum phase transitions and their manifestations in an extended Dicke model

Stránský

Kloc

Cejnar

2017

AIP Conference Proceedings

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Abstract. An Excited-State Quantum Phase Transition (esqpt) is a singularity observed in quantum energy spectra in the infinitesize limit of the system. It originates in the existence of stationary points in the semiclassical Hamiltonian function. We review the classification of esqpts and present a case study in an extended Dicke model. Finally, we show some preliminary results on the dynamical effect induced by esqpts.

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Jacobi-type transitions in the interacting boson model

Cited by 60 publications

References 40 publications

Collision dynamics at medium and relativistic energies

Collision dynamics at medium and relativistic energies

Emergence of asymmetric fermionic order in interacting birefringent fermions

Excited-state quantum phase transitions and their manifestations in an extended Dicke model

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