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

Abstract : Results on pp, π+π+, and π−π− 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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http://hal.in2p3.fr/in2p3-00605080
Contributor : Sophie Heurteau <>
Submitted on : Thursday, June 30, 2011 - 3:06:11 PM
Last modification on : Wednesday, September 16, 2020 - 4:10:32 PM

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G. Agakishiev, A. Balanda, B. Bannier, R. Bassini, D. Belver, et al.. pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV. European Physical Journal A, EDP Sciences, 2011, 47, pp.63. ⟨10.1140/epja/i2011-11063-x⟩. ⟨in2p3-00605080⟩

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