On the Lorentz structure of the symmetry energy

DOI10.1016/J.NUCLPHYSA.2003.12.001zbMATH Open1038.81537arXivnucl-th/0309021OpenAlexW2077701813WikidataQ63957221 ScholiaQ63957221MaRDI QIDQ1421040

D. Massart

Publication date: 25 January 2004

Published in: Nuclear Physics. A (Search for Journal in Brave)

Abstract: We investigate in detail the density dependence of the symmetry energy in a relativistic description by decomposing the iso-vector mean field into contributions with different Lorentz covariant properties. We find important effects of the iso-vector, scalar channel (i.e. $delta$-meson like) on the high density behavior of the symmetry energy. Applications to static properties of finite nuclei and to dynamic situations of heavy ion collisions are explored and related to each other. The nuclear structure studies show only moderate effects originating from the virtual $delta$ meson. At variance, in heavy ion collisions one finds important contributions on the reaction dynamics arising from the different Lorentz structure of the high density symmetry energy when a scalar iso-vector $delta$ field is introduced. Particularly interesting is the related neutron/proton effective mass splitting for nucleon transport effects and for resonance and particle production around the threshold. We show that the $delta$-like channel turns out to be essential for the production of pions, when comparing with experimental data, in particular for high momentum selections.

Full work available at URL: https://arxiv.org/abs/nucl-th/0309021

zbMATH Keywords

density dependencenuclear structurerelativistic isovector mean field

Mathematics Subject Classification ID

Nuclear physics (81V35)

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