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.

arXiv comment11 pages, 12 figures

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Cited by in corpus (9)

• Nuclear dynamics and particle production near threshold energies in heavy-ion collisions
• Effects of a phase transition on two-pion interferometry in heavy-ion collisions at $\sqrt{s_{\mathrm{NN}}}=2.4-7.7$ GeV
• Collective flows of pions in Au+Au collisions at energies 1.0 and 1.5 GeV/nucleon
• Study of $\Delta$ excitations in medium-mass nuclei with peripheral heavy ion charge-exchange reactions
• Preequilibrium particle emissions and in-medium effects on the pion production in heavy-ion collisions
• Systematic study of Δ(1232) resonance excitations using single isobaric charge-exchange reactions induced by medium-mass projectiles of Sn
• Unexpected neutron/proton ratio and isospin effect in low-energy antiproton induced reactions
• Antiproton production in heavy-ion collisions at subthreshold energies
• In-medium pion dispersion relation and medium correction of $N\pi \leftrightarrow \Delta$ near the threshold energy of pion production