Simulating spin dynamics with spin-dependent cross sections in heavy-ion collisions

Xia, Yin; Xu, Jun; Li, Bao-An; Shen, W. Q.

doi:10.1103/physrevc.96.044618

Cited by 6 publications

(3 citation statements)

References 36 publications

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“…Several calculations using Gogny Hartree-Fock-Bogoliubov (D1M) [32], quadrupole-octupole collective Hamiltonian based on the PC-PK1 relativistic density functional (QOCH'') [33] and Gogny Hartree-Fock-Bogoliubov + interacting boson model (D1MIBM') [34] predict very large values of E3 moments in thorium and uranium isotopes with N ≈136-138 (see figure 8). Experiments to measure E3 transition probabilities in these heavier nuclei, and in odd-mass nuclei relevant to EDM searches, await advances in radioactive beam technology that should be realized in the next few years.…”

Section: Discussionmentioning

confidence: 99%

Studies of Heavy Pear-shaped Nuclei

Butler

2023

J. Phys.: Conf. Ser.

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For certain combinations of protons and neutrons it is expected that the shape of atomic nuclei can undergo octupole deformation, which would give rise to reflection asymmetry or a “pear shape”. Here it is described how recent experiments carried out at CERN using REX-ISOLDE and HIE-ISOLDE and the Miniball gamma-ray spectrometer have provided evidence that several radium and radon isotopes have either stable pear shapes or are octupole vibrational in nature. It will be shown that the data on transition moments present some challenges for theory. The relevance of these measurements for atomic EDM searches, and the future prospects for this field, will also be discussed.

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Section: Discussionmentioning

confidence: 99%

Studies of Heavy Pear-shaped Nuclei

Butler

2023

J. Phys.: Conf. Ser.

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“…The applications of this IBUU model now follow three lines. In one line, the spin degree of freedom for nucleons, the nucleon spin-orbit coupling [217], and the spin-dependent nucleon-nucleon scattering cross sections [218] are incorporated to study the spin-dependent collective flows [219] as well as the spin polarization [220] in intermediate-energy heavy-ion collisions. In a second line, the stability of the initialization is further improved to construct the ground state of the nucleus [212], in order to study nuclear giant resonances [221].…”

Section: Current Status Of the Ibuu Modelmentioning

confidence: 99%

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Wolter,

Colonna,

Cozma

et al. 2022

Preprint

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Transport models are the main method to obtain physics information on the nuclear equation of state and in-medium properties of particles from low to relativistic-energy heavy-ion collisions. The Transport Model Evaluation Project (TMEP) has been pursued to test the robustness of transport model predictions in reaching consistent conclusions from the same type of physical model. To this end, calculations under controlled conditions of physical input and set-up were performed with various participating codes. These included both calculations of nuclear matter in a box with periodic boundary conditions, which test separately selected ingredients of a transport code, and more realistic calculations of heavy-ion collisions. Over the years, five studies have been performed within this project. In this intermediate review, we summarize and discuss the present status of the project. We also provide condensed descriptions of the 26 participating codes, which contributed to some part of the project. These include the major codes in use today. After a compact description of the underlying transport approaches, we review the main results of the studies completed so far. They show, that in box calculations the differences between the codes can be well understood and a convergence of the results can be reached. These studies also highlight the systematic differences between the two families of transport codes, known under the names of Boltzmann-Uehling-Uhlenbeck (BUU) and Quantum Molecular Dynamics (QMD) type codes. However, when the codes were compared in full heavy-ion collisions using different physical models, as recently for pion production, they still yielded substantially different results. This calls for further comparisons of heavy-ion collisions with controlled models and of box comparisons of important ingredients, like momentum-dependent fields, which are currently underway. Our evaluation studies often indicate improved strategies in performing transport simulations and thus can provide guidance to code developers. Results of transport simulations of heavy-ion collisions from a given code will have more significance if the code can be validated against benchmark calculations such as the ones summarized in this review.

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“…The spin state is determined with respective to the angular momentum of the two colliding nucleons, and the energy and angular dependence of the cross sections are parameterized in Ref. [31]. Whether the nucleonnucleon collision is successful is determined by a spin-and isospin-dependent Pauli blocking, with the local phasespace cell more specific for nucleons with different spin and isospin states.…”

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confidence: 99%

Nucleon spin polarization in intermediate-energy heavy-ion collisions

Xia

2020

Physics Letters B

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Based on a spin-dependent Boltzmann-Uehling-Uhlenbeck transport model with spin-dependent potentials incorporated using the lattice Hamiltonian method, we have studied the global spin polarization perpendicular to the reaction plane as well as the local spin polarization in the longitudinal direction in non-central intermediate-energy heavy-ion collisions, as an extension of similar studies in relativistic heavy-ion collisions. Both the global and the local spin polarizations are found to be mostly dominated by the time-odd component of the nuclear spin-orbit potential. Impacts of various theoretical uncertainties on the nucleon spin polarization as well as its dependence on the beam energy and impact parameter are discussed. Our study serves as a baseline for understanding the spin polarization mechanism of strongly interacting matter produced in heavy-ion collisions dominated by nucleon degree of freedom.The spin physics is an interesting topic in various fields. Due to the spin-orbit coupling, the spin polarization phenomena can generally be induced in a vorticity field. In non-central relativistic heavy-ion collisions, it was pointed out [1] that the produced quarkgluon plasma can be globally polarized perpendicular to the reaction plane, as a result of the angular momentum transfer from colliding nuclei to the midrapidity region. This can lead to the spin polarization of Λ hyperons or vector mesons, whose polarizations can be experimentally measurable through the angular distribution of their decay. Although the experimentally measured spin polarizations of these particles are small at ultrarelativistic energies [2-4], they become considerably larger at lower collision energies [5]. Theoretical efforts based on transport models or hydrodynamic models have been devoted to predict [1,6] or explain [7-10] the spin polarization phenomena, showing that the quark-gluon plasma can be the most vortical fluid on the earth. Besides the global spin polarization, theorists have more recently predicted that there could be some local structures of the vorticity field [11], and they can lead to the azimuthal angular dependence of the longitudinal spin polarization [12][13][14]. However, the latest experimental data from the STAR Collaboration shows a different azimuthal angular dependence [15] compared to most theoretical studies. These spin polarization phenomena in heavy-ion collisions serve as good probes of understanding the vortical dynamics in the strongly interacting matter as well as the properties of the spin-orbit coupling.In intermediate-energy heavy-ion collisions, one expects that the spin polarization phenomena should exist as well, as a result of the nuclear spin-orbit interaction, which was first proposed to explain the magnetic number of finite nuclei [16,17]. Except for the well-known importance of the nuclear spin-orbit coupling in nuclear struc- * corresponding author: xujun@zjlab.org.cn ture studies, it also has dramatic dynamic effects in lowand intermediate-energy heavy-ion collisions (see, e.g., Ref...

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Simulating spin dynamics with spin-dependent cross sections in heavy-ion collisions

Cited by 6 publications

References 36 publications

Studies of Heavy Pear-shaped Nuclei

Studies of Heavy Pear-shaped Nuclei

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Nucleon spin polarization in intermediate-energy heavy-ion collisions

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