Lynn, K. G.MacDonald, J. R.Boie, R. A.Feldman, L. C.Gabbe, J. D.Robbins, M. F.Bonderup, E.Golovchenko, Jene2016-11-181977Lynn, K. G., MacDonald, J. R., Boie, R. A., Feldman, L. C., Gabbe, J. D.; Robbins, M. F., Bonderup, E., Golovchenko, J. 1977. Positron-Annihilation Momentum Profiles in Aluminum: Core Contribution and the Independent-Particle Model. Physical Review Letters 38, no. 5: 241-244 . doi:10.1103/PhysRevLett.38.2410031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:29407066The momentum profiles from positron annihilation with core electrons in Al have been observed with a recently developed two-detector Doppler-broadening technique. Independent-particle-model (IPM) calculations are in good agreement with the experimental results beyond twice the Fermi momentum and suggest the absence of strong positron-electron correlation effects in this region. Comparisons of calculations with properly normalized momentum profiles indicate that high-momentum core contributions may provide information on the nature of vacancy-type defects and self-trapping effects.en-USJournal Article2016-11-1810.1103/PhysRevLett.38.241