Positron and electron backscattering from solids

New measurements and quantitative analysis of electron backscattering in the energy range of neutron β-decay

“…The Drescher data on Be are systematically higher than the Neubert data. As noted previously, our data tend to agree with the Neubert data on Be, as do the data of Massoumi et al [3,4] taken below 40 keV.…”

“…Our previous work on backscattering [1] from beryllium and silicon extended the work of others [2][3][4] to energies relevant for nuclear physics applications. We further extend this work to a more relevant target, organic scintillator.…”

Theory of positrons in solids and on solid surfaces

“…several groups (Massoumi et al , 1991(Massoumi et al , , 1992(Massoumi et al , , 1993Coleman et al , 1992;Makinen, Palko, et al , 1992). Massoumi et al (1991,1992,1993) have measured the energy and angle-resolved probabilities for several elemental solids.…”

“…Massoumi et al (1991,1992,1993) have measured the energy and angle-resolved probabilities for several elemental solids. Massoumi et al (1992Massoumi et al ( , 1993 and Coleman et al (1992) have performed Monte Carlo simulations that differ from those by Valkealahti and Nieininen (1984) in the treatment of the inelastic electron scattering. In their simulations the inelastic electron-scattering probability is proportional to Im[1/e(q, co)], where A'q and fico are the momentum and energy transfers, respectively.…”

“…The resulting real-space distribution is then the positron implantation profile. Recently, the inelastic-scattering processes with valence electrons have also been taken into account (Coleman et al , 1992;Massoumi et a/. , 1992Massoumi et a/.…”