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 (1)

• Spinodal decomposition of low-density asymmetric nuclear matter

Cited by in corpus (7)

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• 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