Nuclear fragmentation and charge-exchange reactions induced by pions in the $\Delta$-resonance region

Abstract

Dynamics of the nuclear fragmentations and the charge exchange reactions in pion-nucleus collisions near the $\Delta$(1232) resonance energies has been investigated within the Lanzhou quantum molecular dynamics (LQMD) transport model. An isospin, momentum and density-dependent pion-nucleon potential is implemented in the model, which influences the pion dynamics, in particular the kinetic energy spectra, but weakly impacts the fragmentation mechanism. The absorption process in pion-nucleon collisions to form the $\Delta$(1232) resonance dominates the heating mechanism of target nucleus. The excitation energy transferred to the target nucleus increases with the pion kinetic energy and is similar for both ${\pi }^{-}$ and ${\pi }^{+}$ induced reactions. The magnitude of fragmentation of target nucleus weakly depends on the pion energy. The isospin ratio in the pion double charge exchange is influenced by the isospin ingredient of target nucleus.

11 pages, 12 figures

References in corpus (6)

• Neutron and Proton Transverse Emission Ratio Measurements and the Density Dependence of the Asymmetry Term of the Nuclear Equation of State
• Isospin effects on sub-threshold kaon production at intermediate energies
• Pion induced double charge exchange reactions in the Delta resonance region
• Dynamics of pion production in heavy-ion collisions around 1A GeV energies
• Pion Production in Heavy-ion Collisions in the 1 A GeV region
• Particle production in antiproton induced nuclear reactions

Cited by in corpus (2)

• Effects of a phase transition on two-pion interferometry in heavy-ion collisions at $\sqrt{s_{\mathrm{NN}}}=2.4-7.7$ GeV
• Systematic study of Δ(1232) resonance excitations using single isobaric charge-exchange reactions induced by medium-mass projectiles of Sn