p p and pi pi intensity interferometry in collisions of Ar + KCl at 1.76A-GeV

Results on pp, I (+)I (+), and I (-')I (-') intensity interferometry are reported for collisions of Ar+KCl at 1.76A GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The experimental correlation functi ons as a function of the relative momentum are compared to model calculations allowing the determination of the space-time extent of the corresponding emission sources. The I I source radii are found significantly larger than the pp emission radius. The present radii do well complement the beam-energy dependences of Gaussian source radii of the collision system of size A + A 40 + 40 . The pp source radius at fixed beam energy is found to increase linearly with the cube root of the number of participan ts. From this trend, a lower limit of the pp correlation radius is deduced.

beam: energy
interferometer
correlation function
spectrometer
correlation
acceptance
HADES
pi pi

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