Thu·Nov 13, 2025Thursday·November 13, 2025

1. 01*

   ${\beta }^{+}$ radioactive nuclei created during proton therapy

   Izabela Skwira-Chalot🇵🇱 · Przemysław Sekowski · Agata Taranienko · Adam Spyra · Tomasz Matulewicz🇵🇱 · Jan Swakoń · Joanna Matulewicz

   During proton therapy, the beam flux decreases due to inelastic interactions with nuclei. At the highest energies used in proton therapy around 25\% protons initiate nuclear reactions. This report presents the cross section measurements of proton-induced production of three ${\beta }^{+}$ emitters -- ${}^{11}$C, ${}^{13}$N, ${}^{15}$O -- with half-lives between 2 and 20 minutes, using solid C, BN and SiO${}_2$ targets. Stacks of up to 15 targets were irradiated simultaneously with proton beams of kinetic energy below 58 MeV at the AIC-144 cyclotron of the Institute of Nuclear Physics, Polish Academy of Sciences. The measured cross sections follow the excitation function obtained in the previous experiments, with uncertainty of a few percent.

   nucl-exphysics.med-phActa Phys.Polon.A(2025)·0 citations
2. 02*

   Electromagnetic Radiation from Baryon-Rich Matter in Heavy-Ion Collisions

   Xiang-Yu Wu🇨🇦 · Charles Gale🇨🇦 · Sangyong Jeon🇨🇦 · Jean-François Paquet🇺🇸 · Björn Schenke🇺🇸 · Chun Shen🇺🇸

   We perform a study of electromagnetic radiation in heavy-ion collisions at Relativistic Heavy Ion Collider (RHIC) Beam Energy Scan (BES) and SPS energies using the iEBE-MUSIC framework, which includes 3D dynamical Monte Carlo Glauber initial conditions, MUSIC (3+1)D viscous relativistic hydrodynamics, and the UrQMD hadronic afterburner. The multistage modeling has been calibrated to hadronic data at RHIC-BES energies using a Bayesian analysis. Integrating the thermal photon emission rates with the medium evolution, we study the direct photon yield and elliptic flow and how they vary with collision energy and emission source. We compare with results obtained by the STAR and PHENIX Collaborations. We employ next-to-leading order thermal QCD dilepton emission rates to compute dilepton invariant mass spectra and extract the effective temperature of the quark-gluon plasma at different collision energies.

   ↳ nucl-thhep-phnucl-ex3 citations
3. 03*

   Commissioning the Resonance Ionization Spectroscopy Experiment at FRIB

   A.J. Brinson🇺🇸 · B.J. Rickey🇺🇸 · J. M. Allmond🇺🇸 · A. Dockery🇺🇸 · A. Fernandez Chiu · R. F. Garcia Ruiz🇺🇸 · T. J. Gray🇺🇸 · J. Karthein🇺🇸 · T. T. King🇺🇸 · K. Minamisono🇺🇸 · A. Ortiz-Cortes🇺🇸 · S. V. Pineda🇺🇸 and 5 other authors

   This manuscript reports on the commissioning of the Resonance Ionization Spectroscopy Experiment (RISE) at the BECOLA facility at FRIB. The new instrument implements the collinear resonance ionization spectroscopy technique for sensitive measurements of isotope shifts and hyperfine structure of short-lived isotopes produced at FRIB. The existing BECOLA beamline was extended to integrate an electrostatic ion-beam bender and an ion detector at ultra-high vacuum. An injection-seeded Ti:Sapphire laser and a multi-harmonic pulsed Nd:YAG laser were installed to perform resonant excitation and selective ionization. Commissioning tests were performed to demonstrate the capabilities of the new instrument by measuring the hyperfine structure of stable ${}^{27}$Al produced in an offline ion source. The RISE instrument is ready and operational for future studies of short-lived isotopes at FRIB.

   ↳ physics.ins-detnucl-exPRResearch(2026)·3 citations
4. 04*

   Nuclear shape dynamics in low-energy heavy-ion reactions

   K. Hagino🇯🇵

   We discuss recent theoretical developments in low-energy heavy-ion reactions. To this end, we put emphasis on a viewpoint of probing nuclear shapes with heavy-ion reactions. We first discuss a single-channel problem with an optical potential model. We particularly discuss a microscopic modeling of the imaginary part of an optical potential as well as a visualization of quantum interference phenomena observed in heavy-ion elastic scattering. We then discuss multi-channel scattering problems, and demonstrate that heavy-ion fusion reactions at energies around the Coulomb barrier are sensitive to the shape of colliding nuclei, providing a powerful tool to probe nuclear shapes. We finally point out that relativistic heavy-ion collisions have large similarities to low-energy heavy-ion reactions in the context of nuclear shape dynamics.

   ↳ nucl-thnucl-exEPJ Web Conf.(2026)·0 citations
5. 05*

   Explaining higher-order correlations between elliptic and triangular flow

   Mubarak Alqahtani🇸🇦 · Jean-Yves Ollitrault🇫🇷

   The ALICE and CMS Collaborations have analyzed a number of cumulants mixing elliptic flow ($v_2$) and triangular flow ($v_3$), involving up to $8$ particles, in Pb+Pb collisions at the LHC. We unravel an unexpected simplicity in these complex mathematical quantities for collisions at fixed impact parameter. We show that as one increases the order in $v_2$, for a given order in $v_3$, the changes in the cumulants are solely determined by the mean elliptic flow in the reaction plane, which originates from the almond-shaped geometry of the overlap area between the colliding nuclei. We derive simple analytic relations between cumulants of different orders on this basis. These relations are in good agreement with recent data from the CMS Collaboration. We argue that agreement will be further improved if the analysis is repeated with a finer centrality binning. We make quantitative predictions for cumulants of order 10 which have not yet been analyzed.

   ↳ nucl-thhep-exhep-phnucl-exPLB(2026)·1 citation

* 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.