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  • Letter
  • Open Access

Tracing the evolution of nuclear excitation at the future Electron-Ion Collider

Niseem Magdy*

  • *Contact author: niseem.abdelrahman@tsu.edu
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Phys. Rev. C 113, L011901 – Published 12 January, 2026

DOI: https://doi.org/10.1103/kqf6-xczd

Abstract

The evolution of nuclear excitation in electron-gold (e+Au) collisions at the forthcoming Electron-Ion Collider (EIC) is investigated using the beagle event generator. The EIC's collider kinematics and detector-motivated rapidity selections enable a clear separation, in the laboratory frame, of the dominant reaction stages: hard scattering, intranuclear cascade (INC), and nuclear deexcitation. A systematic study of the event-by-event mean transverse momentum fluctuation observable κ reveals strong sensitivity to the intranuclear-cascade formation time and to nuclear geometry, with only weak dependence on the electron-beam energy. These findings indicate that κ can serve as an exploratory diagnostic for disentangling the cascade and deexcitation stages of nuclear excitation at the EIC. The pronounced sensitivity observed within the beagle framework underscores the model dependence of the present results while at the same time motivating systematic cross-model investigations to establish the broader applicability of κ. The results yield stage-resolved, testable predictions for early EIC measurements.

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References (42)

  1. C. A. Bertulani and P. Danielewicz, Introduction to Nuclear Reactions (IOP, Bristol, England, 2004).
  2. G. F. Bertsch and S. D. Gupta, A guide to microscopic models for intermediate energy heavy ion collisions, Phys. Rep. 160, 189 (1988).
  3. O. Buss, T. Gaitanos, K. Gallmeister, H. van Hees, M. Kaskulov, O. Lalakulich, A. B. Larionov, T. Leitner, J. Weil, and U. Mosel, Transport-theoretical description of nuclear reactions, Phys. Rep. 512, 1 (2012).
  4. P. Jucha, M. Klusek-Gawenda, A. Szczurek, M. Ciemala, and K. Mazurek, Neutron emission from the photon-induced reactions in ultraperipheral ultrarelativistic heavy-ion collisions, Phys. Rev. C 111, 034901 (2025).
  5. A. B. Larionov and M. Strikman, Slow neutron production as a probe of hadron formation in high-energy γ*A reactions, Phys. Rev. C 101, 014617 (2020).
  6. K.-H. Schmidt and B. Jurado, Review on the progress in nuclear fission—experimental methods and theoretical descriptions, Rep. Prog. Phys. 81, 106301 (2018).
  7. N. Schunck and L. M. Robledo, Microscopic theory of nuclear fission: A review, Rep. Prog. Phys. 79, 116301 (2016).
  8. R. J. Charity, Nuclear de-excitation: Statistical models and experimental signatures, Phys. Rev. C 82, 014610 (2010).
  9. J. P. Bondorf, A. S. Botvina, A. S. Iljinov, I. N. Mishustin, and K. Sneppen, Statistical multifragmentation of nuclei, Phys. Rep. 257, 133 (1995).
  10. A. Boudard, J. Cugnon, S. Leray, and C. Volant, Intranuclear cascade model for a comprehensive description of spallation reaction data, Phys. Rev. C 66, 044615 (2002).
  11. G. Piller, W. Ratzka, and W. Weise, Phenomenology of nuclear shadowing in deep inelastic scattering, Z. Phys. A 352, 427 (1995) .
  12. M. Arneodo, Nuclear effects in structure functions, Phys. Rep. 240, 301 (1994).
  13. J. Cugnon, Intranuclear cascade model: A review, Nucl. Phys. A 387, 191 (1982).
  14. V. Weisskopf, Statistics and nuclear reactions, Phys. Rev. 52, 295 (1937).
  15. Grant J. Mathews, B. G. Glagola, R. A. Moyle, and V. E. Viola, Inclusion of deuteron and alpha-particle collisions in intranuclear cascade calculations, Phys. Rev. C 25, 2181 (1982).
  16. N. Magdy, M. Hegazy, A. Rafaat, W. Li, A. Deshpande, A. M. H. Abdelhady, A. Y. Ellithi, R. A. Lacey, and Z. Tu, A study of nuclear structure of light nuclei at the electron–ion collider, Eur. Phys. J. A 60, 212 (2024).
  17. J. Lehr, M. Effenberger, and U. Mosel, Final-state interactions in inclusive pion photoproduction from nuclei, Nucl. Phys. A 671, 503 (2000).
  18. A. Schüttauf et al. (ALADIN Collaboration), Systematics of nuclear fragmentation in relativistic heavy ion collisions, Nucl. Phys. A 701, 495 (2002).
  19. G. Agakichiev et al. (HADES Collaboration), The Hades spectrometer at GSI, Eur. Phys. J. A 41, 243 (2009).
  20. G. Cerizza et al. Structure of Sn107 studied through single-neutron knockout reactions, Phys. Rev. C 93, 021601 (2016).
  21. S. A. Bass et al., Microscopic models for ultrarelativistic heavy ion collisions, Prog. Part. Nucl. Phys. 41, 255 (1998).
  22. R. Abdul Khalek et al., Science requirements and detector concepts for the Electron-Ion Collider: EIC yellow report, Nucl. Phys. A 1026, 122447 (2022) .
  23. A. Accardi et al., Electron ion collider: The next QCD frontier, Eur. Phys. J. A 52, 268 (2016).
  24. W. Chang, E.-C. Aschenauer, M. D. Baker, A. Jentsch, J.-H. Lee, Z. Tu, Z. Yin, L. Zheng, Benchmark eA generator for leptoproduction in high-energy lepton-nucleus collisions, Phys. Rev. D 106, 012007 (2022).
  25. The ePIC Collaboration, https://www.epic-eic.org/.
  26. J. Adams et al. (STAR Collaboration), Minijet deformation and charge-independent angular correlations on momentum subspace (η,ϕ) in Au-Au collisions at sNN=130GeV, Phys. Rev. C 73, 064907 (2006).
  27. S. Acharya et al. (ALICE Collaboration), Event-by-event mean pt fluctuations in pp and Pb-Pb collisions at the LHC, Eur. Phys. J. C 79, 857 (2019).
  28. L. Zhang, J. Chen, and C. Zhang, Energy dependence of transverse momentum fluctuations in Au + Au collisions from a multiphase transport model, Phys. Rev. C 111, 024911 (2025) .
  29. S. Roesler, R. Engel, and J. Ranft, The Monte Carlo event generator DPMJET-III, in International Conference on Advanced Monte Carlo for Radiation Physics, Particle Transport Simulation and Applications (MC 2000) (Springer, Berlin, Heidelberg, 2000), pp. 1033–1038.
  30. T. Sjostrand, S. Mrenna, and P. Z. Skands, PYTHIA 6.4 physics and manual, J. High Energy Phys. 05 (2006) 026.
  31. R. Dupré, Quark fragmentation and hadron formation in nuclear matter, Ph.D. thesis, IPNL, Lyon, 2011.
  32. T. T. Böhlen, F. Cerutti, M. P. W. Chin, A. Fassò, A. Ferrari, P. G. Ortega, A. Mairani, P. R. Sala, G. Smirnov, and V. Vlachoudis, The FLUKA code: Developments and challenges for high energy and medical applications, Nucl. Data Sheets 120, 211 (2014).
  33. A. Ferrari, P. R. Sala, A. Fasso, and J. Ranft, FLUKA: A multi-particle transport code (Program version 2005), https://doi.org/10.5170/CERN-2005-010.
  34. G. Battistoni et al., Overview of the FLUKA code, Annu. Nucl. Energy 82, 10 (2015).
  35. M. R. Whalley, D. Bourilkov, and R. C. Group, The Les Houches accord PDFs (LHAPDF) and LHAGLUE, in HERA and the LHC: A Workshop on the Implications of HERA and LHC Physics (Startup Meeting, CERN, 26–27 March 2004; Midterm Meeting, CERN, 11–13 October 2004) (2005), pp. 575–581, arXiv:hep-ph/0508110.
  36. C. M. Robles Gajardo, A. Accardi, M. D. Baker, W. K. Brooks, R. Dupré, M. Ehrhart, J. A. López, and Z. Tu, Low energy protons as probes of hadronization dynamics, Phys. Rev. C 106, 045202 (2022) .
  37. D. Adamova et al. (CERES Collaboration), Event-by-event fluctuations of the mean transverse momentum in 40, 80, and 158 A GeV/c Pb-Au collisions, Nucl. Phys. A 727, 97 (2003) .
  38. S. Gavin, Traces of thermalization from transverse momentum fluctuations in nuclear collisions, Phys. Rev. Lett. 92, 162301 (2004) .
  39. S. Bhatta, C. Zhang, and J. Jia, Higher-order transverse momentum fluctuations in heavy-ion collisions, Phys. Rev. C 105, 024904 (2022) .
  40. M. Cody, S. Gavin, B. Koch, M. Kocherovsky, Z. Mazloum, and G. Moschelli, Complementary two-particle correlation observables for relativistic nuclear collisions, Phys. Rev. C 107, 014909 (2023) .
  41. C. Pruneau, S. Gavin, and S. Voloshin, Methods for the study of particle production fluctuations, Phys. Rev. C 66, 044904 (2002) .
  42. M. I. Gorenstein and M. Gazdzicki, Strongly intensive quantities, Phys. Rev. C 84, 014904 (2011) .

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Phys. Rev. C 113, L011901– Published 12 January, 2026
  • Received 9 June 2025
  • Accepted 1 December 2025
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