Most boson emitting sources contain a core of finite dimensions surrounded by
a large halo, due to long-lived resonances like ω,η,η′,K0 etc.
When the Bose-Einstein correlation (BEC) function of the core can be determined
we show that its intercept (λ) measures, as a function of momentum, the
square of the fraction of core particles produced. A simultaneos measurement of
BEC and the single-particle distributions can thus determine the
characteristics of the core. If the geometrical sizes of the core are
sufficiently large the parameters of the BEC function obey the mt​-scaling
observed in SPb and PbPb reactions at CERN. The model can describe the
measurements of the single- and two-particle distributions in the central
region of SPb reactions. A fit to experimental data shows that the freeze-out
of hadrons occurs at a larger volume and at a much lower temperature than that
given by the measurement of the inverse slope of the mt​-spectrum and
standard BEC analysis.Comment: ReVTeX, LaTeX, 21 pages, one table, no figures; Proceedings of the
International Symposium on Quantum Interferometry Studies in High Energy
Nuclear Collisions, 18-20 April, 1995, Hiroshima, Japan, in pres