Mass dependence of temperature for intermediate mass fragment in heavy-ion reactions

Ma, Chun-Wang; Ding, Tian-Tian; Tian, Junlong

doi:10.1088/1361-6471/aa8a24

Cited by 5 publications

(5 citation statements)

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“…( 5), C is influenced by the asymmetry and free energy of the fragment, as well as the asymmetry of the system (via chemical potential); and τ corresponds to T . T determined from the intermediate mass fragments shows a slight dependence on mass [35], which accounts for the slight dependence of τ on Z. With the limited data reported, the 140A MeV 40 Ca + 9 Be reaction is selected in this work for the reason that a series of proton-rich isotopes have been measured with high quality.…”

Section: Resultsmentioning

confidence: 99%

Predictions for cross sections of light proton-rich isotopes in the ⁴⁰ Ca + ⁹ Be reaction

Song

Wei

2018

Chinese Phys. C

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The cross sections for Z = 10 -19 with isotopes Tz =−3/2 to −5 in the 140A MeV 40 Ca + 9 Be projectile fragmentation reaction have been predicted. An empirical formula based on the correlation between the cross section and average binding energy of an isotope has been adopted to predict the cross section. The binding energies in the AME16, WS4, and the theoretical prediction by the spherical relativistic continuum Hartree−Bogoliubov theory have been used. Meanwhile, the fracs parametrization and the modified statistical abrasion-ablation model are also used to predict the cross sections for the proton-rich isotopes. The predicted cross sections for the Tz =−3 isotopes are close to 10 −10 mb, which hopefully can be studied experimentally. In addition, based on the predicted cross sections, Z = 14 is suggested to be a new magic number in the light proton-rich nuclei with Tz −3/2, for which the phenomenon is much more evident than it is from the average binding energy per nucleon.

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Section: Resultsmentioning

confidence: 99%

Predictions for cross sections of light proton-rich isotopes in the ⁴⁰ Ca + ⁹ Be reaction

Song

Wei

2018

Chinese Phys. C

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show abstract

“…( 5), C is influenced by the asymmetry and free energy of fragment, as well as the asymmetry of system (via chemical potential); and τ corresponds to T . T determined from the intermediate mass fragments shows a slight dependence on mass [35], which accounts for the slight dependence of τ on Z. With the limited data reported, the 140A MeV 40 Ca + 9 Be reaction is selected in this work for the reason that a series of proton-rich isotopes have been measured in high quality.…”

Section: Resultsmentioning

confidence: 99%

Predictions for cross sections of light proton-rich isotopes in $^{40}$Ca + $^{9}$Be reaction

Song,

Wei,

2018

Preprint

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The cross sections for the Z = 10 -19 with isotopes Tz = −3/2 to −5 in the 140A MeV 40 Ca + 9 Be projectile fragmentation reaction have been predicted. An empirical formula based on the correlation between the cross section and average binding energy of isotope has been adopted to predict the cross section. The binding energies in the AME16, WS4, and the theoretical prediction by the spherical relativistic continuum Hartree−Bogoliubov theory have been used. Meanwhile, the fracs parametrization and the modified statistical abrasion-ablation model are also used to predict the cross sections for the proton-rich isotopes. The predicted cross sections for the Tz = −3 isotopes are close to 10 −10 mb, which hopefully can be studied in experiment. In addition, based on the predicted cross sections, the Z = 14 is suggested to be a new magic number in the light proton-rich nuclei with Tz ≤ −3/2, of which the phenomenon is much more evident than it is from the average binding energy per nucleon.

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“…In the first stage of abrasion, they calculate the abrasion cross section with probability P Ns,Zs (b) (N s , Z s denote the neutrons and protons in the projectile-like fragment) at an impact parameter b. An improvement has been achieved by incorporating an impact-parameter-dependent temperature profile in the abrasion simulation [166] (the non-uniform temperature for primary fragments and cold fragments have also been shown [140,144,145,167,168,169,170]). In the second stage, the fragment in the first stage undergoes expanding and breaking up process, which turns into many excited composites and nucleons.…”

Section: Abrasion Plus Canonical Thermodynamic Modelmentioning

confidence: 99%

“…In some cases, the pairing contribution will also be considered [133]. A temperature-dependent parameterized free energy formula will also provide help, such as in the works of [138,139,140]. In a modified Fisher model, the free energy of fragment is parameterized as the Weiszäcker-Beth semiclassical mass formula with a density and temperature dependent coefficients [115,141,142,143,144,145,146,147,148].…”

Section: Thermaldynamics Modelsmentioning

confidence: 99%

“…With the help of transport models, one can study the time evolution of the colliding system. A systematic evolution simulations for the 140 MeV/u 58,64 Ni + 9 Be reactions have been performed using the AMD-V model with the Gogny-g0 interaction, at colliding times t = 20, 40,60,80,100,120,140,180,200,250,300,500,700, and 1000 fm/c. Since the phase space at early time collision will be analyzed, a coalescence radius of R c = 1.5 fm is adopted to reorganize the primary fragments within a range of impact parameters b = 0 to 2 fm.…”

Section: Snmentioning

confidence: 99%

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Shannon information entropy in heavy-ion collisions

2018

Progress in Particle and Nuclear Physics

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102

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The general idea of information entropy provided by C.E. Shannon "hangs over everything we do" and can be applied to a great variety of problems once the connection between a distribution and the quantities of interest is found. The Shannon information entropy essentially quantify the information of a quantity with its specific distribution, for which the information entropy based methods have been deeply developed in many scientific areas including physics. The dynamical properties of heavy-ion collisions (HICs) process make it difficult and complex to study the nuclear matter and its evolution, for which Shannon information entropy theory can provide new methods and observables to understand the physical phenomena both theoretically and experimentally. To better understand the processes of HICs, the main characteristics of typical models, including the quantum molecular dynamics models, thermodynamics models, and statistical models, etc, are briefly introduced. The typical applications of Shannon information theory in HICs are collected, which cover the chaotic behavior in branching process of hadron collisions, the liquid-gas phase transition in HICs, and the isobaric difference scaling phenomenon for intermediate mass fragments produced in HICs of neutron-rich systems. Even though the present applications in heavy-ion collision physics are still relatively simple, it would shed light on key questions we are seeking for. It is suggested to further develop the information entropy methods in nuclear reactions models, as well as to develop new analysis methods to study the properties of nuclear matters in HICs, especially the evolution of dynamics system.

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Mass dependence of temperature for intermediate mass fragment in heavy-ion reactions

Cited by 5 publications

References 56 publications

Predictions for cross sections of light proton-rich isotopes in the ⁴⁰ Ca + ⁹ Be reaction

Predictions for cross sections of light proton-rich isotopes in the ⁴⁰ Ca + ⁹ Be reaction

Predictions for cross sections of light proton-rich isotopes in $^{40}$Ca + $^{9}$Be reaction

Shannon information entropy in heavy-ion collisions

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Mass dependence of temperature for intermediate mass fragment in heavy-ion reactions

Cited by 5 publications

References 56 publications

Predictions for cross sections of light proton-rich isotopes in the 40 Ca + 9 Be reaction

Predictions for cross sections of light proton-rich isotopes in the 40 Ca + 9 Be reaction

Predictions for cross sections of light proton-rich isotopes in $^{40}$Ca + $^{9}$Be reaction

Shannon information entropy in heavy-ion collisions

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Product

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About

Predictions for cross sections of light proton-rich isotopes in the ⁴⁰ Ca + ⁹ Be reaction

Predictions for cross sections of light proton-rich isotopes in the ⁴⁰ Ca + ⁹ Be reaction