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Alpha-particle clustering in self-conjugate nuclei from the experimental side

  • Regular Article – Experimental Physics
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Abstract

The fragmentation of quasi-projectiles from the nuclear reaction \(^{40}\)Ca+\(^{12}\)C at 25 MeV per nucleon bombarding energy was used to produce excited self-conjugate nuclei (from \(^{16}\)O to \(^{28}\)Si). Temperature and density conditions for alpha-clustering were determined. Measured temperatures have been found in the range of 5.5\(-\)6.0 MeV whereas density values of 0.3\(-\)0.4 times the saturation density are deduced. This density domain is also predicted by constrained self-consistent mean field calculations. At present such calculations are performed at zero temperatures and geometric alpha cluster configurations are observed: a tetrahedron for \(^{16}\)O for example. Experimentally, by looking to \(^{8}\)Be production from excited self-conjugate nuclei, a signature of final state interaction between two alpha-particles was evidenced. This indicates that, due to the temperature, geometric configurations are not the only ones present, which argues in favor of finite temperature calculations.

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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data analysed during this study are contained in this published article and in Ref. [27].]

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Acknowledgements

I would like to warmly thank all the members of the CHIMERA collaboration for making it possible to carry out this experiment in the best conditions.

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Authors and Affiliations

  1. Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France

    B. Borderie

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  1. B. Borderie
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Correspondence to B. Borderie.

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Communicated by David Blaschke.

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Borderie, B. Alpha-particle clustering in self-conjugate nuclei from the experimental side. Eur. Phys. J. A 60, 66 (2024). https://doi.org/10.1140/epja/s10050-024-01289-4

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