Analysis of subthreshold antiproton production in<i>p</i>-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

Teis, S.; Cassing, W.; Maruyama, Tomoyuki; Mosel, U.

doi:10.1103/physrevc.50.388

Cited by 59 publications

(89 citation statements)

References 43 publications

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“…The Schrödinger equivalent potential with the above parameters results in a mean ppotential in nuclear matter at groundstate density of about −250 MeV (p p = 0 GeV/c), increasing with energy towards −170 MeV at p p = 1 GeV/c. These values are much more in accord with estimations on the basis of dispersion relations [11] than just taking the sum of the scalar and vector potentials without any cutoff. The actual (averaged) SE-potential of the p's at freeze-out is about −70 MeV in central Au + Au collisions at 10.7 GeV.…”

supporting

confidence: 80%

Antibaryons in massive heavy ion reactions: Importance of potentials

et al. 1996

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In the framework of RQMD we investigate antiproton observables in massive heavy ion collisions at AGS energies and compare to preliminary results of the E878 collaboration. We focus here on the considerable influence of the real part of an antinucleon-nucleus optical potential on thep momentum spectra.PACS numbers: 14.20 Dh, 25.70.-z Antibaryon production is a promising observable for collective effects in nucleus-nucleus collisions. On the other hand, N 's suffer strong final-state interactions. These interactions have two components which can be related to the N self-energy in matter: collisions and annihilation on baryons[1] (imaginary part, semiclassically given by 2ImV = σvρ) and a piece in the real part (ReV = t NN ρ in the impuls approximation). In the semiclassical limit the real part of the self-energy can be approximated by potential-type interaction[2] or a mean field. Here we will focus on the effect of the real part. The motivation is that the long-range force of baryons acting on ap is expected to be stronger than for protons since the Lorentz-scalar and the Lorentz-vector parts of a meson exchange potential now have the same sign. The influence of baryonic mean-fields on baryons and mesons is well established. Therefore there should also be some influence onp's. The substantial impact of mean-fields on particle spectra was studied earlier [3,4]. Following these ideas, we now investigate observables in nucleus-nucleus collisions, where BB-potentials come into play. For this purpose, we employed a simple modelinteraction, knowing that this choice is far from being unique. In principle, one has to calculate the medium-dependent mean-field and the crosssection selfconsistently to understand N behaviour in matter. We calculate the forces acting on a N in a baryonic medium only after freeze-out. However, by taking the free interaction -annihilation, elastic scattering, non-annihilating inelastic channels -for NN in the collision term during the dynamical evolution the real potential is included effectively. Our approach is similar in its spirit to the usual treatment of the Coulomb distortion of particle spectra which is also restricted to final-state interactions [5]. Addition of free interactions and mean-field contribution would cause 1

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confidence: 80%

Antibaryons in massive heavy ion reactions: Importance of potentials

et al. 1996

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“…These predictions are based on the assumption that the relativistic description of the nucleon within the RMF model is a valid concept (for a discussion see Refs. [6,7,8]). Unfortunately, the experimental information on the antinucleon effective potential in nuclei is obscured by the strong absorption caused by annihilation.…”

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confidence: 99%

Enhanced binding and cold compression of nuclei due to admixture of antibaryons

et al. 2002

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We discuss the possibility of producing a new kind of nuclear system by putting a few antibaryons inside ordinary nuclei. The structure of such systems is calculated within the relativistic mean-field model assuming that the nucleon and antinucleon potentials are related by the G-parity transformation. The presence of antinucleons leads to decreasing vector potential and increasing scalar potential for the nucleons. As a result, a strongly bound system of high density is formed. Due to the significant reduction of the available phase space the annihilation probability might be strongly suppressed in such systems.

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“…The role of the Dirac sea in such collisions is discussed in [Ju92]. The production of kaons is examined in [Fa93,Fa93a,Fa94] and of antinucleons, in [Te93,Te94,Li94].…”

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confidence: 99%

Recent Progress in Quantum Hadrodynamics

Serot

Walecka

1997

Int. J. Mod. Phys. E

987

1,511

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Quantum hadrodynamics (QHD) is a framework for describing the nuclear many-body problem as a relativistic system of baryons and mesons. Motivation is given for the utility of such an approach and for the importance of basing it on a local, Lorentz-invariant lagrangian density. Calculations of nuclear matter and finite nuclei in both renormalizable and nonrenormalizable, effective QHD models are discussed. Connections are made between the effective and renormalizable models, as well as between relativistic mean-field theory and more sophisticated treatments. Recent work in QHD involving nuclear structure, electroweak interactions in nuclei, relativistic transport theory, nuclear matter under extreme conditions, and the evaluation of loop diagrams is reviewed.

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Analysis of subthreshold antiproton production inp-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

Cited by 59 publications

References 43 publications

Antibaryons in massive heavy ion reactions: Importance of potentials

Antibaryons in massive heavy ion reactions: Importance of potentials

Enhanced binding and cold compression of nuclei due to admixture of antibaryons

Recent Progress in Quantum Hadrodynamics

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