Thu·Feb 15, 2024Thursday·February 15, 2024

1. 01*

   Proton-proton and proton-cluster femtoscopy at the HADES experiment

   Maria Stefaniak🇺🇸

   This work explores femtoscopic correlations in proton-proton and proton-cluster systems at the HADES experiment, GSI. Through high-precision correlation functions, it reveals the impact of strong interactions between protons and light nuclei (deuteron, triton, Helium-3). For proton-proton interactions, measurements in two centralities and five $k_T$ bins were analyzed. Extracted radii were compared with different Equations of State in UrQMD, providing valuable insights into collision dynamics. This research enhances our understanding of particle interactions and contributes to refining theoretical models in nuclear and particle physics.

   nucl-exhep-ex4 citations
2. 02*

   Study of quasi-projectile properties at Fermi energies in 48Ca projectile systems

   S. Upadhyaya🇵🇱 · K. Mazurek🇵🇱 · T. Kozik🇵🇱 · D. Gruyer🇫🇷 · G. Casini🇮🇹 · S. Piantelli🇮🇹 · L. Baldesi🇮🇹 · S. Barlini🇮🇹 · B. Borderie🇫🇷 · R. Bougault🇫🇷 · A. Camaiani🇮🇹 · C. Ciampi🇫🇷 and 23 other authors

   The emission of the pre-equilibrium particles during nuclear collisions at moderate beam energies is still an open question. This influences the properties of the compound nucleus but also changes the interpretation of the quasi-fission process. A systematic analysis of the data obtained by the FAZIA collaboration during a recent experiment with a neutron rich projectile is presented. The full range of charged particles detected in the experiment is within the limit of isotopic resolution of the FAZIA detector. Quasi-projectile (QP) fragments were detected in majority thanks to the forward angular acceptance of the experimental setup which was confirmed by introducing cuts based on the HIPSE event generator calculations. The main goal was to compare the experimental results with the HIPSE simulations after introducing these cuts to investigate the influence of the n-rich entrance channel on the QP fragment properties. More specifically, the lowering of N/Z of QP fragments with beam energy was found to be present since the initial phase of the reaction. Thus, pre-equilibrium emissions might be a possible candidate to explain such an effect.

   nucl-exEPJA(2024)·2 citations
3. 03*

   Anisotropy Scaling Functions in Heavy-Ion Collisions: Insights into the `Ultra-Central Flow Puzzle' and Constraints on Transport Coefficients and Nuclear Deformation

   Roy A. Lacey (Department of Chemistry, Stony Brook University, Stony Brook, NY, USA)🇺🇸

   Anisotropy scaling functions derived from comprehensive measurements of transverse momentum- and centrality-dependent anisotropy coefficients \(v_2(p_T,\text{cent})\) and \(v_3(p_T,\text{cent})\) in Pb+Pb collisions at 5.02 and 2.76 TeV, Xe+Xe collisions at 5.44 TeV and Au+Au collisions at 0.2 TeV, offer new insights into the `ultra-central flow puzzle.' These functions integrate diverse measurements into a single curve, clarifying anisotropy attenuation throughout the entire \(p_T\) and centrality range. They reveal the influence of initial-state eccentricities (\(\varepsilon_{n}\)), dimensionless size (\(\mathbb{R}\)), radial flow, viscous correction to the thermal distribution function (\(\delta_f\)), the medium's stopping power (\(\Hat{q}\)), and specific shear viscosity (\(\eta/s\)) on the observed anisotropies. This analysis not only enhances understanding of transport coefficients but also provides crucial constraints on nuclear deformation.

   nucl-exhep-exnucl-thPRC(2024)·7 citations
4. 04*

   Understanding the mirror asymmetry in Gamow-Teller transition rates between ${}^{28}$Al(${\beta }^{-}$)${}^{28m}$Si and ${}^{28}$P(${\beta }^{+}$)${}^{28m}$Si

   L. Xayavong🇰🇷 · N. A. Smirnova🇫🇷 · Y. Lim🇰🇷

   The long-standing discrepancy between shell-model and experimental values of the mirror asymmetry in Gamow-Teller transition rates for ${}^{28}$Al(${\beta }^{-}$)${}^{28m}$Si and ${}^{28}$P(${\beta }^{+}$)${}^{28m}$Si is partially resolved by integrating the $p$-orbital contribution into the radial mismatch correction term. This approach offers a potential estimate of the radial mismatch-induced core-orbital contribution based on the French-Macfarlane sum rules, avoiding the need for heavy calculations required by the first-principle shell model. Additionally, the isospin-mixing contribution undergoes considerable improvement through scaling the calculated isospin-mixing correction with the experimental energy separation between the lowest two admixed states, in accordance with the result from the two-level model.

   ↳ nucl-thnucl-exPRC(2024)·2 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.