Nuclear Theory·nucl-th

Tuesday·December 5, 2017

17 papers—8 primary·9 cross-listed

01
Neutron Removal from the Deformed Halo 31Ne Nucleus
Juhee Hong · C.A. Bertulani · A.T. Kruppa
Experimental data on Coulomb breakup and neutron removal indicate that 31Ne is one of the heaviest halo nuclei discovered so far. The possible ground state of 31Ne is either 3/2- coming from p-wave halo or 1/2+ from s-wave halo. In this work, we develop a treatable model to include deformed wave functions and a dynamical knockout formalism which includes the dependence on the nuclear orientation to study the neutron removal from 31Ne projectiles at energies around E=200 MeV/nucleon. A detailed account of the effects of deformation on cross sections and longitudinal momentum distributions is made. Our numerical analysis indicates a preference for the 31Ne ground state with spin parity 3/2-.
nucl-thPRC(2017)·12 citations
02
Searching for the Subatomic Swirls in the CuCu and CuAu Collisions
Shuzhe Shi🇺🇸 · Kangle Li🇨🇳 · Jinfeng Liao🇺🇸
Recently the STAR Collaboration discovered the "subatomic swirls", that is, the most vortical fluid flow structures in the quark-gluon plasma produced via the AuAu collisions at the Relativistic Heavy Ion Collider (RHIC). Published in Nature and featured as a cover story, this discovery attracted significant interest and generated wide enthusiasm. For such an important finding, it is crucial to look for independent evidences of confirmation and to critically test the current interpretation of the global polarization measurement. We suggest that the CuCu and CuAu colliding systems at RHIC provide such opportunity. Interestingly, our calculations reveal that the fluid vorticity in the CuCu or CuAu collision is comparable to that in the AuAu Collision. Surprisingly, we find the computed $Λ$ hyperon polarization effect is stronger in the CuCu and CuAu systems than the AuAu system at the same collisional beam energy and centrality class, with an interesting hierarchy CuCu $>$ CuAu $>$ AuAu due to interplay between $Λ$ production timing and the time evolution of the vorticity. These predictions can be readily tested by experimental data.
nucl-thhep-phPLB(2019)·90 citations
03
Temperature dependence of transport coefficients of QCD in high-energy heavy-ion collisions
Kazuhisa Okamoto🇯🇵 · Chiho Nonaka🇯🇵
Using our developed new relativistic viscous hydrodynamics code, we investigate the temperature dependence of shear and bulk viscosities from comparison with the ALICE data: single particle spectra and collective flows of Pb+Pb $s_{NN} = 2.76$ TeV collisions at the Large Hadron Collider. We find that from the comprehensive analyses of centrality dependence of single particle spectra and collective flows we can extract detailed information on the quark-gluon plasma bulk property, without the information being smeared by the final state interactions.
nucl-thhep-phnucl-exPRC(2018)·16 citations
04
Relation between the Vertex Function and the Propagators in the Pseudovector Coupling Pion-Nucleon System
Susumu Kinpara🇯🇵
The procedure for deriving the Ward-Takahashi identity is applied to the pseudovector coupling pion-nucleon system in which the isovector and axial-vector current does not conserved. The relation is given in closed form although it is more complicated than that of the quantum electrodynamics. The application to the propagator has revealed the interesting results.
nucl-th1 citation
05
Pre-equilibrium effects of the hot nuclei de-excitation via GDR emission - theoretical approach
K. Mazurek🇵🇱 · M. Ciemala🇵🇱 · M. Kmiecik🇵🇱 · A. Maj🇵🇱 · D. Lacroix🇫🇷
The hot rotating nuclei could be formed in the complete and incomplete fusion reaction of two heavy ions. At low bombarding energies the reaction goes via compound nucleus formation and subsequent evaporation of charged particles, neutrons and $γ$ -rays. However, with increasing the energy of the projectile, the emission of particles during the equilibration process becomes more and more probable. This effect can be estimated by the Heavy-Ion Phase-Space Exploration (HIPSE) code which describes the production of clusters of various size from nucleons initially in the target or projectile. This dynamic evolution finalizes with the compound nuclei, quasi-fission or multi-fragmentation products. The hot rotating nuclei produced in fusion reaction can de-excitate by evaporation of particles and emission of $γ$ -rays from the Giant Dipole Resonance, or by fission into two fragments. These processes, evaporation and fission, are described within statistical codes such as GEMINI++ or in dynamical approaches by solving the transport equations of Langevin type. In the present article we will concentrate on the possible effect of the pre-equilibrium emission on the strength function of the effective Giant Dipole Resonance, which can be described within Thermal Shape Fluctuation Model (TSFM) approach.
nucl-thActa Phys.Polon.Supp.(2018)·0 citations
06
Self-consistent account for phonon induced corrections to quadrupole moments of odd nuclei. Pole and non-pole diagrams
E.E. Saperstein · S. Kamerdzhiev · D.S. Krepish · S.V. Tolokonnikov · D. Voitenkov
Recent results of the description of quadrupole moments of odd semi-magic nuclei are briefly reviewed. They are based on the self-consistent theory of finite Fermi systems with account for the phonon-particle coupling (PC) effects. The self-consistent model for describing the PC effects was developed previously for magnetic moments. Account for the non-pole diagrams is an important ingredient of this model. In addition to previously reported results for the odd In and Sb isotopes, which are the proton-odd neighbors of even tin nuclei, we present new results for odd Bi isotopes, the odd neighbors of even lead isotopes. In general, account for the PC corrections makes the agreement with the experimental data significantly better.
nucl-thEPJ Web Conf.(2018)·2 citations
07
Sequential fission of highly excited compound nuclei in a 4D Langevin approach
D. Gruyer🇫🇷 · K. Mazurek🇵🇱 · J. D. Frankland🇫🇷 · E. Bonnet🇫🇷 · P. N. Nadtochy🇷🇺 · A. Chbihi🇫🇷 · J.P. Wieleczko🇫🇷
In highly dissipative collisions between heavy ions, the optimal conditions to investigate different de-excitation channels of hot nuclei such as evaporation, fission or multifragmentation are well known. One crucial issue remains the excitation energy region where fission gives way to multifragmentation. In this paper, the onset of multi-fragment exit channels is investigated in terms of sequential fission. For the first time, the dynamical approach based on solving Langevin transport equations in multidimensional collective coordinate space is used to follow the de-excitation of highly excited (up to E* =223-656 MeV) 248Rf compound nuclei. The sequential fission model we propose contains two steps: (1) time evolution of the compound nucleus up to either scission or residue formation, followed by (2) dynamical calculations of each primary fragment separately. This procedure allows to obtain from one to four cold fragments correlated with the light particles emitted during the de-excitation process. Experimental data measured with the INDRA detector for the 129Xe+ natSn reaction at beam energies 8, 12 and 15 MeV/nucleon provide strong constraints for this sequential fission scenario.
nucl-thnucl-ex0 citations
08
Large directed flow of open charm mesons probes the three dimensional distribution of matter in heavy ion collisions
Sandeep Chatterjee🇵🇱 · Piotr Bożek🇵🇱
Thermalized matter created in non-central relativistic heavy-ion collisions is expected to be tilted in the reaction plane with respect to the beam axis. The most notable consequence of this forward-backward symmetry breaking is the observation of rapidity-odd directed flow for charged particles. On the other hand, the production points for heavy quarks are forward-backward symmetric and shifted in the transverse plane with respect to the fireball. The drag of heavy quarks from the asymmetrically distributed thermalized matter generates a large directed flow for heavy flavor mesons. We predict a very large rapidity odd directed flow of $D$ mesons in non-central Au-Au collisions at $s_{N N} = 200$ GeV, $se v er a l$ $t im es$ $l a r g er$ than for charged particles. A possible experimental observation of a large directed flow for heavy flavor mesons would represent an almost direct probe of the 3-dimensional distribution of matter in heavy-ion collisions.
nucl-thhep-exhep-phnucl-exPRL(2018)·87 citations

Affiliations

first authorsco-authorsvia INSPIRE