Thu·Dec 7, 2023Thursday·December 7, 2023

1. 01*

   Brief review on unstable states in dissociation of relativistic nuclei

   A.A. Zaitsev

   The article presents a review of studying unstable states in the relativistic dissociation of nuclei ${}^{10}$B, ${}^{11,12}$C, ${}^{16}$O, ${}^{22}$Ne, ${}^{28}$Si, ${}^{84}$Kr and ${}^{197}$Au in the energy range from hundreds of MeV/nucleon to several tens of GeV/nucleon using the nuclear track emulsion method. A systematic study of the fragmentation of incident nuclei with multiple formation of the lightest fragments of He and H. This made it possible to study the dynamics of unstable nuclear states of ${}^8$Be, the Hoyle state and the 4$\alpha$-particle state of the ${}^{16}$O nucleus above the threshold in the relativistic dissociation of nuclei due to precision measurements of fragment emission angles. It is shown that to reconstruct the relativistic decays of unstable nuclei in a nuclear track emulsion, it is sufficient to determine the invariant mass of the system of He and H fragments in the approximation of conservation of momentum per nucleon of the parent nucleus. This approach allows one to search for more complex nuclear states. An indication has been obtained of growing probability to detect ${}^8$Be with increasing the number of relativistic $\alpha$ particles in the event.

   nucl-exPhys.Part.Nucl.(2024)·1 citation
2. 02*

   Higher order dynamical charge fluctuations in heavy-ion collisions

   Bhanu Sharma🇮🇳 · P. K. Sahu🇮🇳

   The event-by-event charge fluctuation measurements are proposed to provide the signature of quark-gluon plasma (QGP) in heavy-ion collisions. Measure of dynamical charge fluctuations is expected to carry information of initial fractional charge of the QGP phase at the final state. We propose the higher order charge fluctuation measurement to study the QGP signal in heavy-ion collisions. This higher order charge fluctuation observable can amplify the signature of QGP. Also, the SMASH model is used to study the behavior of these observable in heavy-ion collisions at center of mass energies accessible in the STAR beam energy scan program.

   ↳ nucl-thhep-exhep-phnucl-ex1 citation
3. 03*

   Momentum anisotropy generation in a hybrid approach

   Niklas Götz🇩🇪 · Lucas Constantin🇩🇪 · Hannah Elfner🇩🇪

   Anisotropic flow emerges in all three of hybrid approaches: initial conditions, viscous relativistic hydrodynamics as well as hadronic transport. Previous works focus mainly on a constant or temperature dependent shear viscosity $\eta /s$. Here instead, we study qualitatively the effect of a generalized $\eta /s(T,{\mu }_B)$ in the hybrid approach SMASH-vHLLE-hybrid. The parameterization takes into account the constraints of matching to the transport coefficients in the hadronic phase, as well as of recent Bayesian analysis results. We compare the effect of the different parameterizations in the intermediate energy region of $\sqrt{s_{NN}}$=7.7 - 39.0 GeV. We observe that using the energy density dependent parameterization decreases the effect of the point of particlization. In addition, we quantify the uncertainty due to different initial state profiles, including the SMASH initial conditions as well as TrENTo and IP-Glasma profiles. It can be shown that the initial state transverse momentum impacts final state momentum anisotropy.

   ↳ hep-phnucl-exnucl-th0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.