Nuclear modification factor in intermediate-energy heavy-ion collisions

Abstract

The transverse momentum dependent nuclear modification factors (NMF), namely $R_{CP}$, is investigated for protons produced in Au + Au at 1$A$ GeV within the framework of the isospin-dependent quantum molecular dynamics (IQMD) model. It is found that the radial collective motion during the expansion stage affects the NMF at low transverse momentum a lot. By fitting the transverse mass spectra of protons with the distribution function from the Blast-Wave model, the magnitude of radial flow can be extracted. After removing the contribution from radial flow, the $R_{CP}$ can be regarded as a thermal one and is found to keep unitary at transverse momentum lower than 0.6 GeV/c and enhance at higher transverse momentum, which can be attributed to Cronin effect.

8 pages, 5 figures; aceepted by Physics Letters B

References in corpus (4)

• Systematics of central heavy ion collisions in the 1A GeV regime
• Three-Particle Correlations from Parton Cascades in Au+Au Collisions
• Nuclear Modification Factor for Charged Pions and Protons at Forward Rapidity in Central Au+Au Collisions at 200 GeV
• Cronin effect for protons and pions in pA collisions

Cited by in corpus (1)

• Effect of initial fluctuations on the collective flow in intermediate-energy heavy ion collisions