Isospin compositions of correlated sources in the Fermi energy domain

Abstract

Isotopic yield distributions of nuclei produced in peripheral collisions of ${}^{80}$Kr+${}^{40,48}$Ca at 35 MeV/nucleon are studied. Experimental results obtained by the FAZIA Collaboration at the LNS facility in Catania are compared with calculations performed with the statistical multifragmentation model (SMM). The fragments with atomic number $Z=19-24$ observed at forward angles are successfully described with the ensemble method previously established for reactions at higher energy. Using the SMM results, the isotopic compositions of the projectile residues are reconstructed. The results indicate a significant isospin exchange between the projectile and target nuclei, not far from isospin equilibrium, during the initial phase of the reaction. The two groups of light fragments with $Z=1-4$, experimentally distinguished by their velocities relative to coincident heavy projectile fragments, are found to originate from different sources. The isotopic composition of the slower group is consistent with emission from a low-density neck, enriched in neutrons, and satisfactorily reproduced with SMM calculations for a corresponding neck source of small mass.

arXiv comment15 pages, 12 figures, 3 tables, accepted for publication in Physical Review C

References in corpus (42)

• Recent Progress and New Challenges in Isospin Physics with Heavy-Ion Reactions
• Reaction Dynamics with Exotic Beams
• Isoscaling in Light-Ion Induced Reactions and its Statistical Interpretation
• Statistical Multifragmentation in Central Au+Au Collisions at 35 MeV/u
• Isotopic Scaling and the Symmetry Energy in Spectator Fragmentation
• Isospin dependent multifragmentation of relativistic projectiles
• Breakup Temperature of Target Spectators in Au + Au Collisions at E/A = 1000 MeV
• Neck fragmentation reaction mechanism
• Statistical evolution of isotope composition of nuclear fragments
• Correlations between emission timescale of fragments and isospin dynamics in ${}^{124}$Sn+${}^{64}$Ni and ${}^{112}$Sn+${}^{58}$Ni reactions at 35 AMeV
• Influence of Transport Variables on Isospin Transport Ratios
• Symmetry energy for fragmentation in dynamical nuclear collisions
• Dynamical effects in multifragmentation at intermediate energies
• Isospin Transport at Fermi Energies
• Isospin and symmetry energy effects on nuclear fragment production in liquid-gas type phase transition region
• Symmetry energy and the isoscaling properties of the fragments produced in ${}^{40}$Ar, ${}^{40}$Ca + ${}^{58}$Fe, ${}^{58}$Ni reactions at 25 $-$ 53 MeV/nucleon
• Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation
• Multifragmentation process for different mass asymmetry in the entrance channel around the Fermi energy
• Space and Time pattern of mid-velocity IMF emission in peripheral heavy-ion collisions at Fermi energies
• Experimental investigation of the residues produced in the 136Xe+Pb and 124Xe+Pb fragmentation reactions at 1 A GeV
• Isospin transport in 84Kr + 112,124Sn collisions at Fermi energies
• Formation of hypernuclei in heavy-ion collisions around the threshold energies
• New neutron-deficient isotopes from ${}^{78}$Kr fragmentation
• Neutron to proton ratios of quasiprojectile and midrapidity emission in the ${}^{64}$Zn + ${}^{64}$Zn reaction at 45 MeV/nucleon
• Statistical description of nuclear break-up
• Light charged clusters emitted in 32 MeV/nucleon 136,124Xe+124,112Sn reactions: chemical equilibrium, 3He and 6He production
• 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
• Relevance of equilibrium in multifragmentation
• 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
• Multifragmentation and the symmetry term of the nuclear equation of state
• Short timescale behavior of colliding heavy nuclei at intermediate energies
• Isospin effects and symmetry energy studies with INDRA
• Coupling dynamical and statistical mechanisms for baryonic cluster production in nucleus collisions of intermediate and high energies
• Alpha Conjugate Neck Structures in the Collisions of 35 MeV/nucleon 40Ca with 40Ca
• Interplay of initial deformation and Coulomb proximity on nuclear decay
• Evolution of the statistical disintegration of finite nuclei toward high energy
• Experimental study of the isospin transport with 40,48 Ca+ 40,48 Ca reactions at 35 MeV/nucleon
• Searching for statistical equilibrium in a dynamical multifragmentation path
• Isotopic effects in multifragmentation and the nuclear equation of state
• Discriminant Analysis and Secondary-Beam Charge Recognition

Cited by in corpus (3)

• Isospin diffusion from ${}^{40,48}$Ca${+}^{40,48}$Ca experimental data at Fermi energies: Direct comparisons with transport model calculations
• Revisit to the yield ratio of triton and ${}^3$He as an indicator of neutron-rich neck emission
• Isotopic Transparency in Central Xe+Sn Collisions at 100 MeV/nucleon