Effects of neutron richness on the behavior of nuclear systems at intermediate energies

Cardella, G.; Giuliani, G.; Lombardo, I.; Papa, M.; Acosta, L.; Agodi, C.; Amorini, F.; Anzalone, A.; Auditore, L.; Berceanu, I.; Cavallaro, S.; Chatterjee, M. B.; Filippo, E. De; Geraci, E.; Grassi, L.; Han, Jifeng; Guidara, E. La; Loria, D.; Lanzalone, G.; Maiolino, C.; Minniti, T.; Pagano, A.; Pirrone, S.; Politi, G.; Porto, F.; Rizzo, F.; Russotto, P.; Santoro, S.; Trifiró, A.; Trimarchi, M.; Verde, G.; Vigilante, M.

doi:10.1103/physrevc.85.064609

Cited by 31 publications

(22 citation statements)

References 44 publications

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“…It has been shown [98,99] that different reaction mechanisms from isospin fractionation in the disintegrating system to isospin migration to the low-density neck region , as well as cluster correations, depend on the density-dependence of the symmetry energy [96,100,101].…”

Section: A Heavy-ion Collisions At Low Densitiesmentioning

confidence: 99%

A way forward in the study of the symmetry energy: experiment, theory, and observation

Horowitz

Brown

Kim

et al. 2014

J. Phys. G: Nucl. Part. Phys.

309

307

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The symmetry energy describes how the energy of nuclear matter rises as one goes away from equal numbers of neutrons and protons. This is very important to describe neutron rich matter in astrophysics. This article reviews our knowledge of the symmetry energy from theoretical calculations, nuclear structure measurements, heavy ion collisions, and astronomical observations. We then present a roadmap to make progress in areas of relevance to the symmetry energy that promotes collaboration between the astrophysics and the nuclear physics communities.

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Section: A Heavy-ion Collisions At Low Densitiesmentioning

confidence: 99%

A way forward in the study of the symmetry energy: experiment, theory, and observation

Horowitz

Brown

Kim

et al. 2014

J. Phys. G: Nucl. Part. Phys.

309

307

View full text Add to dashboard Cite

show abstract

“…and experimental efforts. Up to now, both the statistical and dynamical approaches can equally well describe many observables in intermediate energy HICs, such as charge distributions, mean kinetic energies of the emitted fragments and so on, but each of them fail to describe some observables predicted by others, such as the isotope yields, isoscaling, isospin diffusion, bimodality [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. It turns out that this problem is still open and the situation is very complicated.…”

mentioning

confidence: 99%

“…Previous study in reference [15] has shown there is interplay between the binary/ternary break-up (fusion-fission) modes and multi-fragmentation mode, especially for the low-intermediate energy HICs (20-40MeV/nucleon). The binary and ternary break-up [13,14,15,16,17,18,19] modes are mainly related to a slow process [20,21] which can also be described in the statistical way, and multi-fragmentation break-up mode is related to a fast process which can be described in dynamical way. Special attentions have been paid to semi-peripheral collisions at low-intermediate energy for further understanding the fragmentation mechanism, because it is the best way to study the interplay between fusion-fission and multi-fragmentation [17,18,19,22,23,29,24,25] process.…”

mentioning

confidence: 99%

Correlation between the fragmentation modes and light charged particles emission in heavy ion collisions

Zhang

Zhou

Chen

et al. 2015

Sci. China Phys. Mech. Astron.

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The correlations between the shape of rapidity distribution of the yield of light charged particles and the fragmentation modes in semi-peripheral collisions for 70 Zn+ 70 Zn, 64 Zn+ 64 Zn and 64 Ni+ 64 Ni at the beam energy of 35MeV/nucleon are investigated based on ImQMD05 code. Our studies show there is interplay between the binary, ternary and multi-fragmentation breakup modes. The binary and ternary break-up modes more prefer to emit light charged particles at middle rapidity and give larger values of R mid yield compared with the multi-fragmentation break-up mode does. The reduced rapidity distribution for the normalized yields of p, d, t, 3 He, 4 He and 6 He and the corresponding values of R mid yield can be used to estimate the probability of multi-fragmentation break-up modes. By comparing to experimental data, our results illustrate that ≥40% of the collisions events belong to the multi-fragmentation break-up mode for the reaction we studied.Fragmentation mechanism, i.e. does a nucleus break up into several intermediate mass fragments (IMFs) in intermediate energy heavy ion collisions (HICs) in a statistical (thermal) way or dynamical way, has been a longstanding problem in nuclear physics, and it has attracted a lot of theoretical

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“…For each of the three forms of the symmetry energy, approximately 350,000 events were simulated over a triangular impact parameter range from 0 to 12 fm. Lastly, it is worth noting that the CoMD model has been successful in both describing complex heavy-ion collision dynamics over long timescales (including dynamical fission) and providing constraints on E sym (ρ) through comparison with experimental data [21,[48][49][50].…”

mentioning

confidence: 99%

“…The sensitivity of N/Z with breakup time to L can be understood in terms of an initial isospin equilibration followed by a competition of the dinuclear PLF to "fuse" (producing a single PLF) rather than break up into the Z H and Z L fragments [49,50]. The dinuclear system is formed during the projectile-target interaction.…”

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confidence: 99%

Symmetry energy dependence of long-timescale isospin transport

et al. 2014

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Isospin transport occurring within dinuclear projectile-like fragments (PLFs) produced in heavyion collisions is explored as a probe of the nuclear symmetry energy. Within the framework of the Constrained Molecular Dynamics model (CoMD), the existence of the long-lived dinuclear PLFs, for up to 800 fm/c, is observed. It is demonstrated that changes in the N/Z of the two fragments resulting from the breakup of the dinuclear PLF is due to isospin transport. The rate of the transport between the two fragments is shown to be dependent on the slope of the symmetry energy at saturation density. Comparison of the CoMD calculations with experimental data establish that the evolution of N/Z could be used to constrain the density dependence of the symmetry energy. Introduction. The nuclear Equation of State (nEoS), which describes the fundamental properties of infinite nuclear matter, has been the motivation for a broad range of experimental studies. Of particular interest is how the nEoS evolves as a function of the neutron-to-proton ratio (N/Z) of nuclear matter, which is defined by the symmetry energy term of the nEoS [1-3]. The symmetry energy, which is often discussed in reference to its density dependence, E sym (ρ), represents the difference in binding energy between pure neutron matter and symmetric nuclear matter (N = Z). Constraining the form of the density dependence of the symmetry energy is critical for understanding the properties of asymmetric nuclear matter. For example, the masses, collective excitations, and neutron skin thicknesses of finite nuclei are dependent on E sym (ρ) [2,[4][5][6][7][8][9][10][11][12][13]. Beyond the terrestrial laboratory, the symmetry energy has an essential role in the properties and evolution of neutron stars and core-collapse supernovae [14][15][16][17][18][19][20].Constraints on E sym (ρ) are often reported based on the magnitude, E sym (ρ 0 ), and the slope, L = 3ρ •

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Effects of neutron richness on the behavior of nuclear systems at intermediate energies

Cited by 31 publications

References 44 publications

A way forward in the study of the symmetry energy: experiment, theory, and observation

A way forward in the study of the symmetry energy: experiment, theory, and observation

Correlation between the fragmentation modes and light charged particles emission in heavy ion collisions

Symmetry energy dependence of long-timescale isospin transport

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