Evidence for the temporary existence of a ?composite? system in deep inelastic nuclear interactions

Gatty, B.; Guerreau, D.; Lefórt, M.; Pouthas, J.; Tarrago, X.; Galin, J.; Cauvin, B.; Girard, J.; Nifenecker, H.

doi:10.1007/bf01435759

Cited by 79 publications

(35 citation statements)

References 7 publications

(7 reference statements)

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“…On the other hand, the isospin relaxation time decreases slowly with the beam energy. The shorter isospin relaxation time at incident energies below about 50 MeV/nucleon is in agreement with what was found in deep inelastic heavy ion collisions [507][508][509]. At higher incident energies the time for reaching momentum equilibrium is shorter than that for isospin equilibrium.…”

Section: The Isospin Relaxation Time In Heavy-ion Collisionssupporting

confidence: 89%

“…The isospin degree of freedom has been found to reach equilibrium faster than all other degrees of freedom in deep inelastic heavy ion collisions [204,[507][508][509]. Recent experimental studies [425,510,511] of the isotopic composition of intermediate mass fragments (IMF) and their angular distributions in heavy ion collisions have also shown that only at low energies (∼ 30 MeV/nucleon) is isospin equilibrium reached before fragment emission.…”

Section: Transition From Isospin Equilibrium At Low Energies To Transmentioning

confidence: 99%

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Recent progress and new challenges in isospin physics with heavy-ion reactions

2008

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The ultimate goal of studying isospin physics via heavy-ion reactions with neutron-rich, stable and/or radioactive nuclei is to explore the isospin dependence of in-medium nuclear effective interactions and the equation of state of neutron-rich nuclear matter, particularly the isospin-dependent term in the equation of state, i.e., the density dependence of the symmetry energy. Because of its great importance for understanding many phenomena in both nuclear physics and astrophysics, the study of the density dependence of the nuclear symmetry energy has been the main focus of the intermediate-energy heavy-ion physics community during the last decade, and significant progress has been achieved both experimentally and theoretically. In particular, a number of phenomena or observables have been identified as sensitive probes to the density dependence of the nuclear symmetry energy. Experimental studies have confirmed some of these interesting isospin-dependent effects and allowed us to constrain relatively stringently the symmetry energy at sub-saturation densities. The impacts of this constrained density dependence of the symmetry energy on the properties of neutron stars have also been studied, and they were found to be very useful for the astrophysical community. With new opportunities provided by the various radioactive beam facilities being constructed around the world, the study of isospin physics is expected to remain one of the forefront research areas in nuclear physics. In this report, we review the major progress achieved during the last decade in isospin physics with heavy ion reactions and discuss future challenges to the most important issues in this field.Key words: Equation of state of asymmetric nuclear matter, Nuclear symmetry energy, Heavy-ion reactions with neutron-rich nuclei, Neutron skin thickness of heavy nuclei, Neutron stars Constraining the Skyrme effective interactions and the neutron skin thickness of heavy nuclei using terrestrial nuclear laboratory data 216 8

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Section: The Isospin Relaxation Time In Heavy-ion Collisionssupporting

confidence: 89%

Section: Transition From Isospin Equilibrium At Low Energies To Transmentioning

confidence: 99%

Recent progress and new challenges in isospin physics with heavy-ion reactions

2008

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“…In this work we assume the fission fragments have the same N/Z as the one of the initial system and then Z 1 or Z 2 of fission fragments can be deduced from A 1 or A 2 . This assumption is similar to the case of deep inelastic heavy ion collisions at low energies, where the isospin degree of freedom has been found to reach equilibrium first [39]. Fig.…”

Section: Resultssupporting

confidence: 78%

Isoscaling behavior in fission dynamics

Wang

Cai

et al. 2005

Phys. Rev. C

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The fission processes of 112 Sn + 112 Sn and 116 Sn + 116 Sn are simulated with the combination of the Langevin equation and the statistical decay model. The masses of two fission fragments are given by assuming the process of symmetric fission or asymmetric fission by the Monte Carlo sampling with the Gaussian probability distribution. From the analysis to the isotopic/isotonic ratios of the fission fragments from both reactions, the isoscaling behavior has been observed and investigated in details. Isoscaling parameters α and β are extracted as a function of the charge number and neutron number, respectively, in different width of the sampling Gaussian probability distribution. It seems that α is sensitive to the width of fission probability distribution of the mass asymmetrical parameter but β is not. Both α and β drop with the increasing of beam energy and the reduced friction parameter.

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“…In fact, previous studies on similar systems at a much lower energy showed that the isospin degree of freedom was one of the fastest to equilibrate [4]. The most striking and unexpected feature was observed from the isotopic ratios in central collisions at E beam /A = 53 MeV.…”

mentioning

confidence: 87%

Isospin nonequilibrium in heavy-ion collisions at intermediate energies

Yennello

1995

Phys. Rev. C

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We study the equilibration of isospin degree of freedom in intermediate energy heavy-ion collisions using an isospin-dependent BUU model. It is found that there exists a transition from the isospin equilibration at low energies to nonequilibration at high energies as the beam energy varies across the Fermi energy in central, asymmetric heavy-ion collisions. At beam energies around 55MeV/nucleon, the composite system in thermal equilibrium but isospin nonequilibrium breaks up into two primary hot residues with N/Z ratios closely related to those of the target and projectile respectively. The decay of these forward-backward moving residues results in the strong isospin asymmetry in space and the dependence of the isotopic composition of fragments on the N/Z ratios of the target and projectile. These features are in good agreement with those found recently in experiments at NSCL/MSU and TAMU, implications of these findings are discussed.

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Evidence for the temporary existence of a ?composite? system in deep inelastic nuclear interactions

Abstract: Abstract. Masses and charges have been identified for the light fragments (6

Cited by 79 publications

References 7 publications

Recent progress and new challenges in isospin physics with heavy-ion reactions

Recent progress and new challenges in isospin physics with heavy-ion reactions

Isoscaling behavior in fission dynamics

Isospin nonequilibrium in heavy-ion collisions at intermediate energies

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