Browsing Faculty of Arts and Sciences by Author "Cowan, T. E."

Now showing items 1-2 of 2

    • Doppler Broadening of In-Flight Positron Annihilation Radiation due to Electron Momentum 

      Hunt, A. W.; Cassidy, D. B.; Sterne, P. A.; Cowan, T. E.; Howell, R. H.; Lynn, K. G.; Golovchenko, Jene Andrew (American Physical Society (APS), 2001)
      We report the first observation of electron momentum contributions to the Doppler broadening of radiation produced by in-flight two-photon annihilation in solids. In these experiments an approximately 2.5 MeV positron beam ...

    • Resonant versus nonresonant nuclear excitation of 115 In by positron annihilation 

      Cassidy, David W.; Hunt, A. W.; Asoka-Kumar, P.; Bhat, B. V.; Cowan, T. E.; Howell, R. H.; Lynn, K. G.; Mills, A. P.; Palathingal, J. C.; Golovchenko, Jene Andrew (American Physical Society (APS), 2001)
      We have measured the resonant cross section σn for nuclear excitation of 115In via the radiationless annihilation of a positron with a K-shell electron using a monoenergetic positron beam and a thin In target. We find an ...