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- W2078321406 abstract "The time-evolution and space-distribution of internal electromagnetic fields in heavy-ion reactions at beam energies between 200 and 2000 MeV/nucleon are studied within an Isospin-dependent Boltzmann-Uhling-Uhlenbeck transport model IBUU11. While the magnetic field can reach about $7times 10^{16}$ G which is significantly higher than the estimated surface magnetic field ($sim 10^{15}$ G) of magnetars, it has almost no effect on nucleon observables as the Lorentz force is normally much weaker than the nuclear force. Very interestingly, however, the magnetic field generated by the projectile-like (target-like) spectator has a strong focusing/diverging effect on positive/negative pions at forward (backward) rapidities. Consequently, the differential $pi^-/pi^+$ ratio as a function of rapidity is significantly altered by the magnetic field while the total multiplicities of both positive and negative pions remain about the same. At beam energies above about 1 GeV/nucleon, while the integrated ratio of total $pi^-$ to $pi^+$ multiplicities is not, the differential $pi^-/pi^+$ ratio is sensitive to the density dependence of nuclear symmetry energy $E_{rm{sym}}(rho)$. Our findings suggest that magnetic effects should be carefully considered in future studies of using the differential $pi^-/pi^+$ ratio as a probe of the $E_{rm{sym}}(rho)$ at supra-saturation densities." @default.
- W2078321406 created "2016-06-24" @default.
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- W2078321406 date "2011-12-14" @default.
- W2078321406 modified "2023-10-17" @default.
- W2078321406 title "Magnetic effects in heavy-ion collisions at intermediate energies" @default.
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- W2078321406 doi "https://doi.org/10.1103/physrevc.84.064605" @default.
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