Lambda-p femtoscopy in collisions of Ar_s16KCl at 1.76 AGeV
Keywords
p: emission, nucleus nucleus: nuclear reaction, argon, potassium: chlorine, Lambda: hadroproduction, Lambda: hadronic decay, nuclear reaction: space-time, hadron: formation, p Lambda: correlation function, magnetic spectrometer: experimental results, Darmstadt SIS, 1.756 GeV/nucleon
Abstract
Results on $Lambda$p femtoscopy are reported at the lowest energy so far. At a beam energy of 1.76A~GeV, the reaction Ar_s16KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $Lambda$ sample was collected, allowing for the investigation of $Lambda$ p correlations at small relative momenta. The experimental correlation function is compared to corresponding model calculations allowing the determination of the space-time extent of the $Lambda$p emission source. The $Lambda$p source radius is found slightly smaller than the pp correlation radius for a similar collis ion system. The present $Lambda$p radius is significantly smaller than that found for Au_s16Au/Pb_s16Pb collisio ns in the AGS, SPS and RHIC energy domains, but larger than that observed for electroproduction from He. Taking into account all available data, we find the $Lambda$p source radius to increase almost linearly with the number of participants to the power of one-third.
