Femtoscopic measurements in \pPb collisions at $\sqrt{s_{_{\text{NN}}}}= 5.02$~TeV with ATLAS at the LHC

Recent measurements in two-particle correlations in $\pPb$ collisions suggest collective behavior reminiscent of that observed in Pb+Pb. Femtoscopic measurements may provide useful insight on this behavior because they image the spatio-temporal size of the particle emitting region. This proceedings presents identical-pion HBT measurements from ATLAS using one- and three-dimensional correlation functions. Pions are identified using $\dEdx$ measured in the pixel detector. Correlation functions and the resulting HBT radii will be presented as a function of pair momentum ($\kT$) and collision centrality.