Influence of fast emissions and statistical de-excitation on the isospin transport ratio

Camaiani, A.; Piantelli, S.; Ono, Akira; Casini, G.; Borderie, B.; Bougault, R.; Ciampi, C.; Dueñas, J. A.; Frosin, C.; Frankland, J.D.; Gruyer, D.; Neindre, N. Le; Lombardo, I.; Mantovani, G.; Ottanelli, P.; Pârlog, M.; Pasquali, G.; Upadhyaya, S. K.; Valdré, S.; Verde, G.; Vient, E.

doi:10.1103/physrevc.102.044607

Cited by 13 publications

(15 citation statements)

References 46 publications

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“…These different trends can be interpreted in the light of a dominating statistical decay process for n-rich or n-deficient excited nuclei. Indeed, the steep decrease of the average N/Z with respect to the projectile values (1.4 and 1 for the n-rich and n-deficient system, respectively) is mainly due to the statistical decay [31]. As explained in [58], excited nuclei follow an average path in the N − Z plane during the decay and, with increasing initial excitation, tend to approach a specific region of that plane, called Evaporation Actractor Line (EAL) [58], described by a N/Z ratio, depending on the nuclear size.…”

Section: Neutron-proton Equilibration: Evaporative and Break-up Channelsmentioning

confidence: 98%

“…1). Such behavior has been recently investigated in a specific work [31], in a full model framework, for the systems here discussed. In this paper one demonstrates, by means of the AMD simulation coupled with statistical models, that the charge equilibration process measured via isospin transport ratio is indeed affected by perturbations introduced by the dynamical and sta- tistical emissions from the fragments after their separation.…”

Section: Neutron-proton Equilibrationmentioning

confidence: 99%

“…By analyzing the evolving output of the model, we can access to the end of the projectile-target interaction phase (labeled as t DIC ), by means of the procedure described in refs. [31,34]. In order to pin down the mechanism responsible for the observe discrepancies with experiment, we applied some special conditions on the analyzed events, as follows.…”

Section: Neutron-proton Equilibrationmentioning

confidence: 99%

“…For the two symmetric systems 48 Ca+ 48 Ca and 40 Ca+ 40 Ca, R(X) assumes the value of +1 and -1, respectively. Such a method allows to enhance the equilibration signal due to the isospin diffusion [5,21,27], reducing the effects of any unwanted overlapping process, and effectively cancelling those introducing a linear transformation of X [31]. Moreover, we note that if the chosen variable linearly depends on the isospin of the system, R(X) = ±1 represents the "No Equilibration" limit, while R(X) = 0 the "Full Equilibration" value [30].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Isospin diffusion measurement from the direct detection of a quasiprojectile remnant

Camaiani¹,

Casini²,

Piantelli³

et al. 2021

Phys. Rev. C

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Section: Neutron-proton Equilibration: Evaporative and Break-up Channelsmentioning

confidence: 98%

Section: Neutron-proton Equilibrationmentioning

confidence: 99%

Section: Neutron-proton Equilibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Isospin diffusion measurement from the direct detection of a quasiprojectile remnant

Camaiani¹,

Casini²,

Piantelli³

et al. 2021

Phys. Rev. C

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“…[17] can be used, as shown, e.g., in Refs. [3,6,14]; this technique is extremely powerful because it allows to minimize undesired effects introducing linear perturbations with respect to the primary fragment partitions [18], such as pre-equilibrium emission or sequential decay.…”

Section: Introductionmentioning

confidence: 99%

Isospin transport phenomena for the systems Kr80+Ca40,48 at 35 MeV/nucleon

Piantelli¹,

Casini²,

Ono³

et al. 2021

Phys. Rev. C

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Experimental data concerning isospin transport phenomena for the systems 80 Kr + 40,48 Ca at 35 MeV/nucleon are presented. Data have been collected with four FAZIA blocks; this data set is the same analyzed in S. Piantelli et al., Phys. Rev. C 101, 034613 (2020). The isotopic composition of the QuasiProjectile residue (up to Z around 25) and of its decay products in the two reactions are compared, finding a neutron enrichment when the target is 48 Ca. The isotopic composition of the emitted light charged particles (LCP) and intermediate mass fragments (IMF) was also investigated in different windows of velocity. The obtained results have been compared with the prediction of the transport model AMD followed by the statistical code GEMINI (used as an afterburner), with different recipes for the density dependence of the symmetry energy term in the nuclear equation of state. A weak indication in favor of a stiff symmetry energy emerges when the fragments emitted at midvelocity are examined.

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Constraining the density dependence of the symmetry energy: the isospin transport ratio revisited

Mallik¹,

Gulminelli²,

Gruyer³

2021

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

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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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Influence of fast emissions and statistical de-excitation on the isospin transport ratio

Cited by 13 publications

References 46 publications

Isospin diffusion measurement from the direct detection of a quasiprojectile remnant

Isospin diffusion measurement from the direct detection of a quasiprojectile remnant

Isospin transport phenomena for the systems Kr80+Ca40,48 at 35 MeV/nucleon

Constraining the density dependence of the symmetry energy: the isospin transport ratio revisited

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