Angle-resolved Wigner time delay in atomic photoionization: The 4d subshell of free and confined Xe

The angular dependence of photoemission time delay for the inner nd3/2 and nd5/2 subshells of free and confined Xe is studied in the dipole relativistic random phase approximation. A finite spherical annular well potential is used to model the confinement due to fullerene C60 cage. Near cancellations in a variety of the dipole amplitudes, Cooper-like minima, are found. The effects of confinement on the angular dependence, primarily confinement resonances, are demonstrated and detailed.