منابع مشابه
Hard photon and neutral pion production in cold nuclear matter
The production of hard photons and neutral pions in 190 MeV proton induced reactions on C, Ca, Ni, and W targets has been for the first time concurrently studied. Angular distributions and energy spectra up to the kinematical limit are discussed and the production cross-sections are presented. From the target mass dependence of the cross-sections the propagation of pions through nuclear matter ...
متن کاملN̄ excitation for pion propagator in nuclear matter
The particle hole and delta hole excitations are well known elementary excitation modes for pion propagator in nuclear matter. But, the excitation also involves antiparticles, namely, nucleon-antinucleon, antidelta-nucleon and delta-antinucleon excitations. These are important for high energy-momentum as well, and not studied before. In this paper, we give both the formulae and the numerical ca...
متن کاملPCAC constraints on pion production/absorption within nonrelativistic nuclear dynamics
We show the necessity of two-nucleon axial currents and associated pion emission/absorption operators for the partial conservation of the axial current (PCAC) nuclear matrix elements with arbitrary nuclear dynamics described by a nonrelativistic Schrödinger equation. As examples we construct such nonrelativistic axial two-body currents in the linearand the heterotic (gA = 1.26) sigma models, wi...
متن کاملBaryon stopping as a probe for highly excited nuclear matter
The amount of baryon stopping in central P b + P b collisions from 20 – 160 A·GeV as well as hyperon rapidity distributions are calculated within the UrQMD model in comparison to experimental data at 40, 80 and 160 A·GeV taken recently from the NA49 collaboration. Furthermore, the amount of baryon stopping at 160 A·GeV for P b+P b collisions is studied as a function of centrality in comparison ...
متن کاملPion Suppression in Nuclear Collisions
The pion multiplicity per participating nucleon in central nucleus–nucleus collisions at the energies 2–15 A·GeV is significantly smaller than in nucleon–nucleon interactions at the same collision energy. This effect of pion suppression is argued to appear due to the evolution of the system produced at the early stage of heavy–ion collisions towards a local thermodynamic equilibrium and further...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 1992
ISSN: 0375-9474
DOI: 10.1016/0375-9474(92)90595-b