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Articles de revues sur le sujet « Isospin diffusion »

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Auteur : Grafiati
Publié le 10 mars 2023

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1

Mallik, S., F. Gulminelli et D. Gruyer. « Constraining the density dependence of the symmetry energy : the isospin transport ratio revisited ». Journal of Physics G : Nuclear and Particle Physics 49, no 1 (26 novembre 2021) : 015102. http://dx.doi.org/10.1088/1361-6471/ac3473.

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Abstract The isospin diffusion of the quasi-projectile formed in the Ni 64 , 58 on Ni 64 , 58 reactions in the Fermi energy domain is investigated in the framework of the Boltzmann–Uehling–Uhlenbeck transport model. The well known isospin transport ratio observable is revisited, with the aim of insuring an optimal comparison between experimental data and theoretical calculations and reducing the present uncertainties in the extraction of empirical equation of state parameters. We show that isospin transport ratios are sensitive to all the low order isovector parameters (E sym, L sym and K sym, but the quantitative results depend on the choice of the isospin sensitive observable. We demonstrate that realistic models of the equation of state, covering the uncertainty that presently affects the theoretical description of neutron stars static observables, can be effectively discriminated by isospin diffusion experiments, provided the neutron to proton ratio of the projectile remnant is precisely measured as a function of centrality.
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2

Tsang, Betty. « Isospin diffusion in heavy ion collisions ». Nuclear Physics A 734 (avril 2004) : 605–8. http://dx.doi.org/10.1016/j.nuclphysa.2004.01.112.

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3

Tsang, Betty, et Lijun Shi. « Isospin diffusion in heavy ion collisions ». Nuclear Physics A 738 (juin 2004) : 115–21. http://dx.doi.org/10.1016/j.nuclphysa.2004.04.019.

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4

TSANG, M. B., YINGXUN ZHANG, P. DANIELEWICZ, M. FAMIANO, ZHUXIA LI, W. G. LYNCH, Z. Y. SUN et al. « CONSTRAINTS ON THE DENSITY DEPENDENCE OF THE SYMMETRY ENERGY ». International Journal of Modern Physics E 19, no 08n09 (septembre 2010) : 1631–38. http://dx.doi.org/10.1142/s0218301310016041.

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Collisions involving 112 Sn and 124 Sn nuclei have been calculated with the ImQMD transport model in order to place constraints on the density dependences of the nuclear symmetry energy. Consistent constraints on the symmetry energy at sub-saturation density have been obtained by comparing these transport calculations to measurements of isospin diffusion and to the ratios of neutron and proton spectra. New isospin diffusion results from E/A = 35 MeV are also presented.
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5

GALICHET, E., M. F. RIVET, B. BORDERIE, M. COLONNA, R. BOUGAULT, D. DURAND, N. LE NEINDRE et al. « THE ISOSPIN DIFFUSION IN 58Ni-INDUCED REACTIONS AT INTERMEDIATE ENERGIES ». International Journal of Modern Physics E 19, no 08n09 (septembre 2010) : 1534–44. http://dx.doi.org/10.1142/s021830131001593x.

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Isospin diffusion is probed as a function of the dissipated energy by studying two systems 58 Ni +58 Ni and 58 Ni +197 Au , over the incident energy range 52-74A MeV. Experimental data are compared with the results of a microscopic transport model with two different parameterizations of the symmetry energy term. A better overall agreement between data and simulations is obtained when using a symmetry term with a potential part linearly increasing with nuclear density. The isospin equilibration time at 52 A MeV is estimated to 130 ± 10 fm/c.
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6

CHEN, LIE-WEN, CHE MING KO et BAO-AN LI. « CONSTRAINING THE SKYRME EFFECTIVE INTERACTIONS AND THE NEUTRON SKIN THICKNESS OF NUCLEI USING ISOSPIN DIFFUSION DATA FROM HEAVY ION COLLISIONS ». International Journal of Modern Physics E 15, no 07 (octobre 2006) : 1385–95. http://dx.doi.org/10.1142/s0218301306004946.

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Recent analysis of the isospin diffusion data from heavy-ion collisions based on an isospin- and momentum-dependent transport model with in-medium nucleon-nucleon cross sections has led to the extraction of a value of L = 88 ± 25 MeV for the slope of the nuclear symmetry energy at saturation density. This imposes stringent constraints on both the parameters in the Skyrme effective interactions and the neutron skin thickness of heavy nuclei. Among the 21 sets of Skyrme interactions commonly used in nuclear structure studies, the 4 sets SIV, SV, Gσ, and Rσ are found to give L values that are consistent with the extracted one. Further study on the correlations between the thickness of the neutron skin in finite nuclei and the nuclear matter symmetry energy in the Skyrme Hartree-Fock approach leads to predicted thickness of the neutron skin of 0.22 ± 0.04 fm for 208 Pb , 0.29 ± 0.04 fm for 132 Sn , and 0.22 ± 0.04 fm for 124 Sn .
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7

ZHANG, YINGXUN, M. B. TSANG, ZHUXIA LI, P. DANIELEWICZ, W. G. LYNCH et XIAOHUA LU. « PROBING THE DENSITY DEPENDENCE OF SYMMETRY ENERGY AT SUBSATURATION DENSITY WITH HICs ». International Journal of Modern Physics E 19, no 08n09 (septembre 2010) : 1639–46. http://dx.doi.org/10.1142/s0218301310016053.

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The reaction mechanism of the central collisions and peripheral collisions for 112,124 Sn + 112,124 Sn at E/A = 50 MeV is investigated within the framework of the Improved Quantum Molecular Dynamics model. The results show that multifragmentation process is an important mechanism at this energy region, and the influence of the cluster emission on the double n / p ratios and the isospin transport ratio is important. Furthermore, three observables, double n / p ratios, isospin diffusion and the rapidity distribution of the ratio R7 for 112,124 Sn +112,124 Sn at E/A = 50 MeV are analyzed with the Improved Quantum Molecular Dynamics model. The results show that these three observables are sensitive to the density dependence of the symmetry energy. By comparing the calculation results to the data, the consistent constraint on the density dependence of the symmetry energy from these three observables is obtained.
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8

SCHMIDT, K. E., A. SARSA et S. FANTONI. « A CONSTRAINED PATH MONTE CARLO METHOD FOR NUCLEON SYSTEMS ». International Journal of Modern Physics B 15, no 10n11 (10 mai 2001) : 1510–18. http://dx.doi.org/10.1142/s0217979201005994.

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By combining diffusion Monte Carlo for the spatial degrees of freedom and auxiliary field Monte Carlo to separate the spin-isospin operators, we can solve for the ground state of many-nucleon systems. We use a path constraint to control the fermion sign problem and apply the method to neutron systems interacting with the Argonne v′8 two nucleon potential and the Urbana IX three-nucleon potential. We compare our results with fermion hypernetted chain calculations.
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9

XU, JUN, CHE MING KO, LIE-WEN CHEN, BAO-AN LI et HONG-RU MA. « TRANSITION DENSITY AND PRESSURE AT THE INNER EDGE OF NEUTRON STAR CRUSTS ». International Journal of Modern Physics E 19, no 08n09 (septembre 2010) : 1705–11. http://dx.doi.org/10.1142/s0218301310016120.

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Using the nuclear symmetry energy that has been recently constrained by the isospin diffusion data in intermediate-energy heavy ion collisions, we have studied the transition density and pressure at the inner edge of neutron star crusts, and they are found to be 0.040 fm -3 ≤ ρt ≤ 0.065 fm -3 and 0.01 MeV / fm 3 ≤ Pt ≤ 0.26 MeV / fm 3, respectively, in both the dynamical and thermodynamical approaches. We have also found that the widely used parabolic approximation to the equation of state of asymmetric nuclear matter gives significantly higher values of core-crust transition density and pressure, especially for stiff symmetry energies. With these newly determined transition density and pressure, we have obtained an improved relation between the mass and radius of neutron stars.
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10

Verde, G., Z. Y. Sun, M. B. Tsang, W. G. Lynch, F. Amorini, L. Andronenko, M. Andronenko et al. « Probing the equation of state of asymmetric nuclear matter with isospin diffusion and stopping in heavy-ion collisions ». Journal of Physics : Conference Series 312, no 8 (23 septembre 2011) : 082044. http://dx.doi.org/10.1088/1742-6596/312/8/082044.

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11

KASMUDIN et A. SULAKSONO. « IMPACTS OF PARAMETERS ADJUSTMENT OF RELATIVISTIC MEAN FIELD MODEL ON NEUTRON STAR PROPERTIES ». International Journal of Modern Physics E 20, no 05 (mai 2011) : 1271–85. http://dx.doi.org/10.1142/s0218301311018320.

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Analysis of the parameters adjustment effects in isovector as well as in isoscalar sectors of effective field based relativistic mean field (E-RMF) model in the symmetric nuclear matter and neutron-rich matter properties has been performed. The impacts of the adjustment on slowly rotating neutron star are systematically investigated. It is found that the mass–radius relation obtained from adjusted parameter set G2** is compatible not only with neutron stars masses from 4U 0614+09 and 4U 1636-536, but also with the ones from thermal radiation measurement in RX J1856 and with the radius range of canonical neutron star of X7 in 47 Tuc, respectively. It is also found that the moment inertia of PSR J073-3039A and the strain amplitude of gravitational wave at the Earth's vicinity of PSR J0437-4715 as predicted by the E-RMF parameter sets used are in reasonable agreement with the extracted constraints of these observations from isospin diffusion data.
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12

Rust, Felix. « In-Medium Effects in the Holographic Quark-Gluon Plasma ». Advances in High Energy Physics 2010 (2010) : 1–141. http://dx.doi.org/10.1155/2010/564624.

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We use the gauge/gravity duality to investigate various properties of strongly coupled gauge theories, which we interpret as models for the quark-gluon plasma (QGP). In particular, we use variants of the D3/D7 setup as an implementation of the top-down approach of connecting string theory with phenomenologically relevant gauge theories. We focus on the effects of finite temperature and finite density on fundamental matter in the holographic quark-gluon plasma, which we model as theN=2hypermultiplet in addition to theN=4gauge multiplet of supersymmetric Yang-Mills theory. We use a setup in which we can describe the holographic plasma at finite temperature and either baryon or isospin density and investigate the properties of the system from three different viewpoints. (i) We study meson spectra. Our observations at finite temperature and particle density are in qualitative agreement with phenomenological models and experimental observations. They agree with previous publications in the according limits. (ii) We study the temperature and density dependence of transport properties of fundamental matter in the QGP. In particular, we obtain diffusion coefficients. Furthermore, in a kinetic model we estimate the effects of the coupling strength on meson diffusion and therewith equilibration processes in the QGP. (iii) We observe the effects of finite temperature and density on the phase structure of fundamental matter in the holographic QGP. We trace out the phase transition lines of different phases in the phase diagram.
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13

Lavagno, A. « Nuclear phase transition and thermodynamic instabilities in dense nuclear matter ». EPJ Web of Conferences 182 (2018) : 03007. http://dx.doi.org/10.1051/epjconf/201818203007.

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We study the presence of thermodynamic instabilities in a nuclear medium at finite temperature and density where nuclear phase transitions can take place. Such a phase transition is characterized by pure hadronic matter with both mechanical instability (fluctuations on the baryon density) that by chemical-diffusive instability (fluctuations on the electric charge concentration). Similarly to the liquid-gas phase transition, the nucleonic and the Δ-matter phase have a different isospin density in the mixed phase. In the liquid-gas phase transition, the process of producing a larger neutron excess in the gas phase is referred to as isospin fractionation. A similar effects can occur in the nucleon-Δ matter phase transition due essentially to a Δ- excess in the Δ-matter phase in asymmetric nuclear matter. In this context we also discuss the relevance of Δ-isobar and hyperon degrees of freedom in the bulk properties of the protoneutron stars at fixed entropy per baryon, in the presence and in the absence of trapped neutrinos.
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14

Liu, T. X., W. G. Lynch, M. B. Tsang, X. D. Liu, R. Shomin, W. P. Tan, G. Verde et al. « Isospin diffusion observables in heavy-ion reactions ». Physical Review C 76, no 3 (6 septembre 2007). http://dx.doi.org/10.1103/physrevc.76.034603.

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15

Sun, Z. Y., M. B. Tsang, W. G. Lynch, G. Verde, F. Amorini, L. Andronenko, M. Andronenko et al. « Isospin diffusion and equilibration forSn+Sncollisions atE/A=35MeV ». Physical Review C 82, no 5 (23 novembre 2010). http://dx.doi.org/10.1103/physrevc.82.051603.

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16

Erdmenger, Johanna, Matthias Kaminski et Felix Rust. « Isospin diffusion in thermal AdS/CFT correspondence with flavor ». Physical Review D 76, no 4 (2 août 2007). http://dx.doi.org/10.1103/physrevd.76.046001.

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17

Camaiani, A., G. Casini, S. Piantelli, A. Ono, E. Bonnet, R. Alba, S. Barlini et al. « Isospin diffusion measurement from the direct detection of a quasiprojectile remnant ». Physical Review C 103, no 1 (8 janvier 2021). http://dx.doi.org/10.1103/physrevc.103.014605.

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18

Galichet, E., M. F. Rivet, B. Borderie, M. Colonna, R. Bougault, A. Chbihi, R. Dayras et al. « Isospin diffusion inNi58-induced reactions at intermediate energies. I. Experimental results ». Physical Review C 79, no 6 (24 juin 2009). http://dx.doi.org/10.1103/physrevc.79.064614.

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19

Galichet, E., M. Colonna, B. Borderie et M. F. Rivet. « Isospin diffusion inNi58-induced reactions at intermediate energies. II. Dynamical simulations ». Physical Review C 79, no 6 (24 juin 2009). http://dx.doi.org/10.1103/physrevc.79.064615.

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20

Camaiani, A., G. Casini, S. Piantelli, A. Ono, E. Bonnet, R. Alba, S. Barlini et al. « Isospin diffusion measurement from the direct detection of a quasiprojectile remnant ». Physical Review C 103, no 1 (8 janvier 2021). http://dx.doi.org/10.1103/physrevc.103.014605.

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21

Tsang, M. B., T. X. Liu, L. Shi, P. Danielewicz, C. K. Gelbke, X. D. Liu, W. G. Lynch et al. « Isospin Diffusion and the Nuclear Symmetry Energy in Heavy Ion Reactions ». Physical Review Letters 92, no 6 (10 février 2004). http://dx.doi.org/10.1103/physrevlett.92.062701.

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22

Bu, Yanyan, Xiyang Sun et Biye Zhang. « Holographic Schwinger-Keldysh field theory of SU(2) diffusion ». Journal of High Energy Physics 2022, no 8 (22 août 2022). http://dx.doi.org/10.1007/jhep08(2022)223.

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Abstract We construct effective field theory for SU(2) isospin charge diffusion, based on holographic Schwinger-Keldysh contour [1]. The holographic model consists of a probe SU(2) gauge field in a doubled Schwarzschild-AdS5 geometry. Accurate to first order in derivative expansion, we analytically compute the effective action up to quartic order in dynamical variables. The effective theory contains both non-Gaussianity for noises and nonlinear interactions between noises and dynamical variables. Moreover, the effective theory captures both thermal and quantum fluctuations, which perfectly satisfy dynamical Kubo-Martin-Schwinger (KMS) symmetry at quantum level. Interestingly, the dynamical KMS symmetry, which is crucial in formulating non-equilibrium effective field theory for a quantum many-body system, is found to have a nice holographic interpretation.
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23

Chen, Lie-Wen, Che Ming Ko et Bao-An Li. « Determination of the Stiffness of the Nuclear Symmetry Energy from Isospin Diffusion ». Physical Review Letters 94, no 3 (26 janvier 2005). http://dx.doi.org/10.1103/physrevlett.94.032701.

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24

Steiner, Andrew W., et Bao-An Li. « Isospin diffusion in heavy-ion collisions and the neutron skin thickness of lead ». Physical Review C 72, no 4 (12 octobre 2005). http://dx.doi.org/10.1103/physrevc.72.041601.

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25

Piantelli, S., S. Valdré, S. Barlini, G. Casini, M. Colonna, G. Baiocco, M. Bini et al. « Isospin diffusion in binary collisions of S32+Ca40,48 and S32+Ti48 at 17.7 MeV/nucleon ». Physical Review C 96, no 3 (27 septembre 2017). http://dx.doi.org/10.1103/physrevc.96.034622.

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26

Niu, Fei, Peng-Hui Chen, Ya-Fei Guo, Chun-Wang Ma et Zhao-Qing Feng. « Effect of isospin diffusion on the production of neutron-rich nuclei in multinucleon transfer reactions ». Physical Review C 97, no 3 (19 mars 2018). http://dx.doi.org/10.1103/physrevc.97.034609.

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27

Ciampi, C., S. Piantelli, G. Casini, G. Pasquali, J. Quicray, L. Baldesi, S. Barlini et al. « First results from the INDRA-FAZIA apparatus on isospin diffusion in Ni58,64+Ni58,64 systems at Fermi energies ». Physical Review C 106, no 2 (8 août 2022). http://dx.doi.org/10.1103/physrevc.106.024603.

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