  The measurement of two-particle Bose-Einstein momentum correlation functions
are presented using $\sqrt{s_{_{\text{NN}}}}=5.02$ TeV PbPb collision data,
recorded by the CMS experiment in 2018. The measured correlation functions are
discussed in terms of L\'evy type source distributions. The L\'evy source
parameters are extracted as functions of transverse mass and collision
centrality. These source parameters include the correlation strength $\lambda$,
the L\'evy stability index $\alpha$, and the L\'evy scale parameter $R$. The
source shape, characterized by $\alpha$, is found to be neither Gaussian nor
Cauchy. A hydrodynamic-like scaling of $R$ is also observed.
