pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV

Abstract

Results on pp, π+π+, and ππ 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 functions 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 ππ 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 participants. From this trend, a lower limit of the pp correlation radius is deduced.

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Correspondence to R. Kotte.

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Communicated by C. Signorini

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The HADES Collaboration., Agakishiev, G., Balanda, A. et al. pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV. Eur. Phys. J. A 47, 63 (2011). https://doi.org/10.1140/epja/i2011-11063-x

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Keywords

  • Impact Parameter
  • Collision System
  • Source Radius
  • Track Candidate
  • HADES Collaboration