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Explore the century-long journey of Bose-Einstein condensation theory and its experimental observation in liquid helium-4 through this 51-minute conference lecture. Trace the historical development from Einstein's 1925 prediction of ideal Bose-gas condensation through decades of scientific skepticism until London's mathematical validation in 1938. Discover how the simultaneous discovery of superfluidity in liquid helium-4 by Kapitza, Allen, and Misener in 1938 reignited interest in Bose-Einstein condensation phenomena. Learn about London's groundbreaking hypothesis connecting the lambda-point phase transition in liquid helium to Bose-Einstein statistical condensation. Examine the experimental breakthrough of the 1970s at JINR-Dubna, where high-energy neutron scattering techniques with short de Broglie wavelengths successfully detected zero-momentum condensed atoms in superfluid helium II. Understand how this innovative approach provided the first experimental evidence that zero-momentum condensation occurs simultaneously with superfluidity below the lambda-point, confirming theoretical predictions made decades earlier.
