  Neutron energy-dependent angular distributions were observed for individual
$\gamma$-rays from the 0.74 eV p-wave resonance of $^{139}$La+$n$ to several
lower excited states of $^{140}$La. The $\gamma$-ray signals were analyzed in a
two dimensional histogram of the $\gamma$-ray energy, measured with distributed
germanium detectors, and neutron energy, determined with the time-of-flight of
pulsed neutrons, to identify the neutron energy dependence of the angular
distribution for each individual $\gamma$-rays. The angular distribution was
also found for a photopeak accompanied with a faint p-wave resonance component
in the neutron energy spectrum. Our results can be interpreted as interference
between s- and p-wave amplitudes which may be used to study discrete symmetries
of fundamental interactions.
