Effects of $P_{\mathrm{tot}}$ gates and velocity gates on light-particle momentum correlation in intermediate-energy heavy-ion collisions

Abstract

Momentum correlation functions at small relative momenta are calculated for light particles $\left(n,p,d,t\right)$ emitted from ${}^{197}$Au + ${}^{197}$Au collisions at different impact parameters and beam energies within the framework of the isospin-dependent quantum molecular dynamics model complemented by the $Lednick\acute{y}$ and $Lyuboshitz$ analytical method. We first make sure our model is able to reproduce the FOPI data of proton-proton momentum correlation in a wide energy range from 0.4$A$ GeV to 1.5$A$ GeV. Then we explore more physics insights through the emission times and momentum correlations among different light particles. The specific emphasize is the effects of total pair momentum among different light particles, impact parameters and in-medium nucleon-nucleon cross section. Both two-deuteron and two-triton correlation functions are anti-correlation due to the final state interaction, and they are affected by in-medium nucleon-nucleon cross section for the higher total momentum of the particle pairs, but not for the lower ones. In addition, impact parameter and in-medium nucleon-nucleon cross section dependences of the emission source radii are extracted by fitting the momentum correlation functions. The results indicate that momentum correlation functions gating with total pair momentum is stronger for the smaller in-medium nucleon-nucleon cross section factor $\left(\eta \right)$ or impact parameter $\left(b\right)$. Non-identical particle correlations ($np,pd,pt,$ and $dt$) are also investigated by the velocity-gated correlation functions which can give information of the particles' emission sequence, and the result indicates that heavier ones $\left(deuteron/triton\right)$ are, one the average, emitted earlier than protons, in the small relative momentum region.

8 figures, 2 tables, 11 pages

References in corpus (8)

• In-medium NN cross sections determined from stopping and collective flow in intermediate-energy heavy-ion collisions
• Scaling of Anisotropic Flow and Momentum-Space Densities for Light Particles in Intermediate Energy Heavy Ion Collisions
• Surveying the Nucleon-Nucleon Momentum Correlation Function in the Framework of Quantum Molecular Dynamics Model
• Correlations and Characterization of Emitting Sources
• Different mechanism of two-proton emission from proton-rich nuclei ${}^{23}$Al and ${}^{22}$Mg
• Nucleon-nucleon momentum correlation function as a probe of the density distribution of valence neutron in neutron-rich nucleus
• d-alpha Correlation functions and collective motion in Xe+Au collisions at E/A=50 MeV
• Nucleon-nucleon momentum correlation function for light nuclei

Cited by in corpus (7)

• Two-proton momentum correlation from photondisintegration of $\alpha$-clustering light nuclei in the quasi-deuteron region
• Short range correlations in the extended quantum molecular dynamics model
• Effects of neutron-skin thickness on direct hard photon emission from reactions induced by the neutron-rich projectile ${}^{50}$Ca
• Extract neutron-neutron interaction strength and spatial-temporal dynamics of neutron emission from two-particle correlation function
• Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model
• Temperature and density effects on the two-nucleon momentum correlation function from excited single nuclei
• Azimuthal anisotropy and multiplicities of hard photons and free nucleons in intermediate-energy heavy-ion collisions