Observation of Long-Range Collective Flow in O + O and Ne + Ne Collisions and Implications for Nuclear Structure Studies

The long-range collective flow of particles produced in oxygen-oxygen (O+O) and neon-neon (Ne+Ne) collisions is measured with the CMS detector at the CERN LHC. The data samples were collected at a center-of-mass energy per nucleon pair of 5.36 TeV, with integrated luminosities of 7 nb$^{−1}$ and 0.8 nb$^{−1}$ for O+O and Ne+Ne collisions, respectively. Two- and four-particle azimuthal correlations are measured over nearly five units of pseudorapidity. Significant elliptic (𝑣$_2$) and triangular (𝑣$_3$) flow harmonics are observed in both systems. The ratios of 𝑣$_𝑛$ coefficients between Ne+Ne and O+O collisions suggest sensitivity to the intrinsic nuclear structure of the respective Ne and O ions. Hydrodynamic models with ab initio nuclear structure inputs qualitatively reproduce the collision-overlap dependence of both the 𝑣$_𝑛$ values and the Ne+Ne to O+O ratios. These measurements provide new constraints when modeling the interplay of nuclear structure and collective dynamics in collisions of $^{16}$O and $^{20}$Ne ions, respectively.

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Publication Details

Journal
KITopen
Published
2026-09-17
DOI
https://doi.org/10.5445/ir/1000197086
Primary Topic
High-Energy Particle Collisions Research
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article
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Observation of Long-Range Collective Flow in O + O and Ne + Ne Collisions and Implications for Nuclear Structure Studies

M. De Coen, C.-E. Wulz, S. Bein, M. Delcourt et al.
KITopen
High-Energy Particle Collisions Research
article

Observation of Long-Range Collective Flow in O + O and Ne + Ne Collisions and Implications for Nuclear Structure Studies

M. De Coen, C.-E. Wulz, S. Bein, M. Delcourt, G. A. Alves, J. Lidrych, P. Malek, V. Lemaitre, A. Sharma, F. Heyen, S. Turkcapar, W. L. Aldá Júnior, G. Gokbulut, N. Van Den Bossche, L. Thomas, M. Vanden Bemden, C. Vander Velde, D. Dobur, C. Mora Herrera, D. Marckx, P. Kashko, A. Tumasyan, P. S. Hussain, M. Dragicevic, J. Bierkens, T. Van Laer, F. Gameiro Casalinho, J. Schieck, J. Vandenbroeck, CMS Collaboration, D. Vannerom, Y. Hong, F. Zhang, G. Bruno, G. P. Van Onsem, I. Makarenko, A. Giammanco, C. Delaere, H. Evard, J. De Favereau De Jeneret, C. Hensel, P. Mastrapasqua, M. Jeitler, S. Lowette, S. Tavernier, A. Vilela Pereira, P. Gianneios, L. Favart, M. Shooshtari, A. Cappati, A. Benecke, N. Breugelmans, E. Coelho, A. J. Li, N. Krammer, D. Liko, M. A. Shahzad, S. Van Putte, H. Aarup Petersen, W. Waltenberger, M. Matthewman, J. D’Hondt, A. Khalilzadeh, M. Barroso Ferreira Filho, A. O. Guzel, R. Schöfbeck, P. Van Mechelen, A. K. Das, H. Kwon, J. van der Linden, S. Dansana, D. Matos Figueiredo, B. Bilin, T. Menezes De Oliveira, M. Sonawane, G. De Lentdecker, P. Vanlaer, T. Bergauer, I. De Bruyn, D. Ocampo Henao, T. Janssen, A. Hayrapetyan, P. Rebello Teles, E. J. Tonelli Manganote, A. M. Tomaru, A. Bethani, W. Adam, A. Malara, L. Benato, A. De Moor, V. Makarenko, K. Skovpen, M. Soeiro, M. Tytgat, C. Giordano, D. Müller, J. N. Song, L. Wezenbeek, F. A. Khan, B. Clerbaux
article en

Abstract

The long-range collective flow of particles produced in oxygen-oxygen (O+O) and neon-neon (Ne+Ne) collisions is measured with the CMS detector at the CERN LHC. The data samples were collected at a center-of-mass energy per nucleon pair of 5.36 TeV, with integrated luminosities of 7 nb$^{−1}$ and 0.8 nb$^{−1}$ for O+O and Ne+Ne collisions, respectively. Two- and four-particle azimuthal correlations are measured over nearly five units of pseudorapidity. Significant elliptic (𝑣$_2$) and triangular (𝑣$_3$) flow harmonics are observed in both systems. The ratios of 𝑣$_𝑛$ coefficients between Ne+Ne and O+O collisions suggest sensitivity to the intrinsic nuclear structure of the respective Ne and O ions. Hydrodynamic models with ab initio nuclear structure inputs qualitatively reproduce the collision-overlap dependence of both the 𝑣$_𝑛$ values and the Ne+Ne to O+O ratios. These measurements provide new constraints when modeling the interplay of nuclear structure and collective dynamics in collisions of $^{16}$O and $^{20}$Ne ions, respectively.

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