Spin–Isospin Modes in Heavy-Ion Collisions

Helgesson, J.; Randrup, J.

doi:10.1006/aphy.1999.5906

Cited by 6 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[32]. We actually do not propagate the full spectral function of pions [58][59][60][61][62]. We describe the particles as classical quasi-particles by adding an effective optical potential for the pions in nuclear medium.…”

Section: Descriptions Of the Impibuu Transport Modelmentioning

confidence: 99%

Symmetry energy extracted from the S$π$RIT pion data in Sn+Sn systems

Yong

2021

Preprint

View full text Add to dashboard Cite

With the improved particular Isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model (impIBUU) including the nucleon-nucleon short-range correlations, the ratios and yields of π − and π + in Sn+Sn systems with different asymmetries at 270 MeV/nucleon are studied. It is found that the yields of π − and π + and their ratios in Sn+Sn systems characterized by different neutron to proton ratios obtained from the very recent SπRIT pion data, are quite well described by the model, especially when a soft symmetry energy with L(ρ0) = 66.75±24.75 MeV is used. The calculations also clearly demonstrate that the high-momentum tail of the nucleon initialization in momentum space strongly affects the yields and ratios of pion production in Sn+Sn systems with different asymmetries near or below threshold. In addition, given many insoluble theoretical uncertainties in transport models, multi-system experimental measurements with various N/Z asymmetries are proposed to extract the symmetry energy less model-dependently by using heavy-ion collisions.

show abstract

Section: Descriptions Of the Impibuu Transport Modelmentioning

confidence: 99%

Symmetry energy extracted from the S$π$RIT pion data in Sn+Sn systems

Yong

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In Refs. [33,34], the in-medium pion dispersion relations, ∆ decay widths, as well as cross sections for pion reabsorption and ∆ production obtained from ∆-hole model were incorporated into a hadronic transport model, and found that π and ∆ production and absorption rates were strongly modified. If, e.g.…”

Section: Motivationmentioning

confidence: 99%

Collective flows of pions in Au+Au collisions at energies 1.0 and 1.5 GeV/nucleon

Liu

Wang

et al. 2018

Phys. Rev. C

View full text Add to dashboard Cite

Based on the newly updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model, the pion potentials obtained from the in-medium dispersion relation of the ∆hole model and from the modified phenomenological approach are further introduced. Both the rapidity y 0 and transverse-velocity u t0 dependence of directed v 1 and elliptic v 2 flows of π + and π − charged mesons produced from Au+Au collisions at two beam energies of 1.0 GeV/nucleon and 1.5 GeV/nucleon and within a large centrality region of 0 < b 0 < 0.55 are scanned. Calculations with pion potentials as well as without considering the pion potential are compared to the newly experimental data released by the FOPI collaboration at GSI. It is found that the directed flow is more sensitive to the pion potential than the elliptic one, and the attractive pion potential from the phen.B mode of the phenomenological approach is too strong to describe the flow data and can be safely ruled out. The relatively weak pion potential from the ∆-hole model can supply a good description for the FOPI data of both flows as functions of both centrality and rapidity. A two-peak/valley structure occurs in the transverse-velocity dependent directed flow but the elliptic flow drops monotonously with increasing u t0 . Finally, both v 1 and v 2 flows with large u t0 from semi-central heavy ion collisions can be taken as sensitive probes for the pion potential. 25.75.Ld

show abstract

“…In this semi-classical transport model IBUU, I actually do not propagate the full spectral function of pions [32][33][34][35][36]. I describe the particles as classical quasi-particles by adding an effective optical potential for the pions in the nuclear medium.…”

Section: Modeling Pion Production In the Ibuu Transport Modelmentioning

confidence: 99%

Modeling pion production in heavy-ion collisions at intermediate energies

Yong

2017

Phys. Rev. C

View full text Add to dashboard Cite

Pion production in nucleus-nucleus collisions at intermediate energies was modeled in the framework of the Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model. The effects of nucleon-nucleon short-range correlations in initialization and mean-field potential, isospindependent in-medium baryon-baryon elastic and inelastic cross sections and pion in-medium effect are all considered in this model. It is found that the ratio and yields of π − and π + in Au+Au reaction at 400 MeV/nucleon reproduce the FOPI/GSI data very well especially with a soft symmetry energy in the present transport model. Predictions on the single and double π − /π + ratio are made for the isotope reaction systems 132 Sn + 124 Sn and 108 Sn + 112 Sn at 300 MeV/nucleon since related experiments are being carried out at RIKEN/Japan.

show abstract

Spin–Isospin Modes in Heavy-Ion Collisions

Cited by 6 publications

References 36 publications

Symmetry energy extracted from the S$π$RIT pion data in Sn+Sn systems

Symmetry energy extracted from the S$π$RIT pion data in Sn+Sn systems

Collective flows of pions in Au+Au collisions at energies 1.0 and 1.5 GeV/nucleon

Modeling pion production in heavy-ion collisions at intermediate energies

Contact Info

Product

Resources

About