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UV–VIS emissions from high energy heavy ions: mechanisms and applications to single-ion detection
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SOFIA Software
No full textThe SOFIA software module, integrated into the R3BRoot framework, provides comprehensive tools for configuring and managing the SOFIA detector analysis, specifically designed for nuclear fission experiments performed with the GLAD superconducting spectrometer. Sofia-R3BRoot, built on the FairRoot framework, offers a robust software environment for conducting detailed Monte Carlo simulations and processing experimental data from R3B (Reactions with Relativistic Radioactive Beams) experiments. Key features include precise detector geometry modeling, particle tracking, event reconstruction, and physics analysis, all of which support the study of fission dynamics and nuclear structure in high-energy heavy-ion collision scenarios at the GSI-FAIR facility. The SOFIA software package is distributed as a source release, with regular updates available for MacOS and Linux
Measurement of isolated prompt photon production in pp and p–Pb collisions at the LHC
No full textThis paper presents the measurement of the isolated prompt photon inclusive production cross section in pp and p–Pb collisions by the ALICE Collaboration at the LHC. The measurement is performed in p–Pb collisions at centre-of-mass energies per nucleon pair of and 8.16 TeV, as well as in pp collisions at and 8 TeV. The cross section is obtained at midrapidity . However, deviations from unity () of up to 20% are observed for with limited significance, indicating the possible presence of nuclear effects in the initial state of the collision. The suppression increases with decreasing with a significance of for a non-zero slope and yields with a significance of at for . In addition, a significance of is observed for at the lower collision energy for . The magnitude and shape of the suppression are consistent with pQCD predictions at NLO using nPDFs that incorporate nuclear shadowing effects in the Pb nucleus
Observation of deuteron and antideuteron formation from resonance-decay nucleons
No full textHigh-energy hadronic collisions generate environments characterized by temperatures above 100 MeV (refs. ), about 100,000 times hotter than the centre of the Sun. At present, it is therefore unclear how light (anti)nuclei with mass number A of a few units, such as the deuteron, He or He, each bound by only a few MeV, can emerge from these collisions. Here, the ALICE Collaboration reports that deuteron–pion momentum correlations in proton–proton (pp) collisions provide model-independent evidence that about 90% of the observed (anti)deuterons are produced in nuclear reactions following the decay of short-lived resonances, such as the Δ(1232). These findings, obtained by the ALICE Collaboration at the Large Hadron Collider, resolve a gap in our understanding of nucleosynthesis in ultrarelativistic hadronic collisions. Apart from offering insights on how (anti)nuclei are formed in hadronic collisions, the results can be used in the modelling of the production of light and heavy nuclei in cosmic rays and dark-matter decays