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We investigate identical pion HBT intensity interferometry in central Au+Au collisions at 1.23A GeV. High-statistics π−π− and π+π+ data are measured with HADES at SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta in the longitudinally comoving system and parametrized as three-dimensional Gaussian distribution, are studied as function of transverse momentum. A substantial charge-sign difference of the source radii is found, particularly pronounced at low transverse momentum. The extracted source parameters agree well with a smooth extrapolation of the center-of-mass energy dependence established at higher energies, extending the corresponding excitation functions down towards a very low energy.
The source of the data used in this paper are recordings of conversations with a Lithuanian girl, Rūta. Rūta lives in Vilnius and is the only child in the family. Both parents speak standard Lithuanian without dialectal influences. The recordings were taken on a free basis without a fixed schedule, then transcribed by the mother of the child, double-checked and coded in accordance with CHILDES by the author of the paper. At the moment of writing this contribution the data taken between 1;7-2;5 have been fully processed. Over this period about 34.5 hours of recordings were collected.