nucl-th digest · Jul 19, 2022

Nuclear excitation cross section of

^{229}

Th via inelastic electron scattering

Nuclear excitation cross section of

^{229}

Th from the ground state to the low-lying isomeric state via inelastic electron scattering is calculated, on the level of Dirac distorted wave Born approximation. With electron energies below 100 eV, inelastic scattering is very efficient in the isomeric excitation, yielding excitation cross sections on the order of 10

^{- 27}

to 10

^{- 26}

^{2}

. Systematic analyses are presented on elements affecting the excitation cross section, including the ion-core potential, the relativistic effect, the knowledge of the reduced nuclear transition probabilities, etc.

nucl-thPRC(2022)·26 citations

Effective shear and bulk viscosities of the quark-gluon plasma: QCD versus heavy-ion data

Fernando G. Gardim🇧🇷 · Jean-Yves Ollitrault🇫🇷

In recent years, there has been a significant effort to extract the temperature-dependent shear ( $η / s$ ) and bulk ( $ζ / s$ ) viscosity over entropy ratios of the quark-gluon plasma from a global comparison of heavy-ion data with results of hydrodynamic simulations. However, anisotropic flow, which is arguably the most sensitive probe of viscosity, is only sensitive to an {\it effective\/} viscosity over entropy ratio, which is obtained by taking a weighted average over the temperature, and summing the contributions of shear and bulk. We estimate this effective viscosity using existing first-principles calculations, which give $0.17 < (η / s)_{eff} < 0.21$ , and $(ζ / s)_{eff} < 0.08$ , implying that the damping of anisotropic flow at the LHC is mostly due to shear viscosity. The values extracted from global data analyses are compatible with these theory predictions.

nucl-thhep-phnucl-exActa Phys.Polon.Supp.(2023)·3 citations

Tuesday·July 19, 2022

Nuclear excitation cross section of $^{229}$ Th via inelastic electron scattering

Effective shear and bulk viscosities of the quark-gluon plasma: QCD versus heavy-ion data

Affiliations

Nuclear excitation cross section of 229Th via inelastic electron scattering

Effective shear and bulk viscosities of the quark-gluon plasma: QCD versus heavy-ion data

Affiliations

Nuclear excitation cross section of $^{229}$ Th via inelastic electron scattering