https://doi.org/10.1140/epja/s10050-024-01289-4
Regular Article – Experimental Physics
Alpha-particle clustering in self-conjugate nuclei from the experimental side
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
a
bernard.borderie@ijclab.in2p3.fr
Received:
2
November
2023
Accepted:
4
March
2024
Published online:
18
March
2024
The fragmentation of quasi-projectiles from the nuclear reaction 
Ca+
C at 25 MeV per nucleon bombarding energy was used to produce excited self-conjugate nuclei (from 
O to 
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 0.30.4 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 O for example. Experimentally, by looking to 
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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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
