Abstract
AbstractIt is shown that the transverse radius, obtained from analysis of two‐pion correlation functions in the mid‐rapidity domain, should reflect the radius of the pion emitting volume. Emission is interpreted as the decoupling from strong interaction, during expansion of the initial interaction volume. Assuming an isotropic expansion without radial flow, and a simultaneous freeze‐out of pions throughout the source volume we show that the transverse radius from interferometry should be proportional to the square root of the hadron rapidity density, dN/dy, observed at mid‐rapidity. Recent data from hadron‐hadron and nucleus‐nucleus collisions at or above √s ≈︁ 20 GeV per nucleon are well interpolated by this result.
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