Neutron to proton ratios of quasiprojectile and midrapidity emission in the ${}^{64}$Zn + ${}^{64}$Zn reaction at 45 MeV/nucleon

Abstract

Simultaneous measurement of both neutrons and charged particles emitted in the reaction ${}^{64}$Zn + ${}^{64}$Zn at 45 MeV/nucleon allows comparison of the neutron to proton ratio at midrapidity with that at projectile rapidity. The evolution of N/Z in both rapidity regimes with increasing centrality is examined. For the completely re-constructed midrapidity material one finds that the neutron-to-proton ratio is above that of the overall ${}^{64}$Zn + ${}^{64}$Zn system. In contrast, the re-constructed ratio for the quasiprojectile is below that of the overall system. This difference provides the most complete evidence to date of neutron enrichment of midrapidity nuclear matter at the expense of the quasiprojectile.

References in corpus (14)

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• Nuclear Isospin Diffusivity
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Cited by in corpus (11)

• Probing the Nuclear Symmetry Energy with Heavy Ion Collisions
• Experimental effects on dynamics and thermodynamics in nuclear reactions on the symmetry energy as seen by the CHIMERA 4$\pi$ detector
• Isospin transport in 84Kr + 112,124Sn collisions at Fermi energies
• Isospin diffusion measurement from the direct detection of a Quasi-Projectile remnant
• First results from the INDRA-FAZIA apparatus on isospin diffusion in ${}^{58,64}$Ni+${}^{58,64}$Ni systems at Fermi energies
• Dynamical fission of the quasiprojectile and isospin equilibration for the system 80Kr+ 48 Ca at 35 MeV/nucleon
• Timescale for equilibration of N/Z gradients in dinuclear systems
• Experimental study of the isospin transport with 40,48 Ca+ 40,48 Ca reactions at 35 MeV/nucleon
• Isospin compositions of correlated sources in the Fermi energy domain
• Revisit to the yield ratio of triton and ${}^3$He as an indicator of neutron-rich neck emission
• Study of quasi-projectile properties at Fermi energies in 48Ca projectile systems