PT Journal
AU HADES Collaboration (Agakishiev, Gea
   Diaz, J
   Gil, A
TI pp and pi pi intensity interferometry in collisions of Ar+KCl at 1.76A GeV
SO European Physical Journal A
JI Eur. Phys. J. A
PY 2011
BP 63
EP 8pp
VL 47
IS 5
DI 10.1140/epja/i2011-11063-x
LA English
AB Results on pp, pi(+) pi(+), and pi-pi-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 pp 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 similar or equal to 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.
ER