TY - JOUR
T1 - Angular correlation of annihilation photons in ice single crystals
AU - Mogensen, O. E.
AU - Kvajic, G.
AU - Eldrup, Morten Mostgaard
AU - Milosevic-Kvajic, M.
PY - 1971
Y1 - 1971
N2 - Linear-slit angular-correlation curves were obtained at - 148 °C for the [0001], [10¯10], and [11¯20] directions in single crystals of ice. Besides the narrow central peak, pronounced narrow side peaks were also observed. They occurred at angles θ=2πℏgz/mc, where gz is the projection of reciprocal-lattice vectors g⃗ on the direction perpendicular to the slits and the sample surface. The relative area of the central plus the side peaks was (15.2 ± 0.4)% for all curves. All the peaks are interpreted as due to parapositronium annihilation. The side peaks are explained as evidence for the positronium center-of-mass wave function being a Bloch function, i.e., that positronium is delocalized in ice.
AB - Linear-slit angular-correlation curves were obtained at - 148 °C for the [0001], [10¯10], and [11¯20] directions in single crystals of ice. Besides the narrow central peak, pronounced narrow side peaks were also observed. They occurred at angles θ=2πℏgz/mc, where gz is the projection of reciprocal-lattice vectors g⃗ on the direction perpendicular to the slits and the sample surface. The relative area of the central plus the side peaks was (15.2 ± 0.4)% for all curves. All the peaks are interpreted as due to parapositronium annihilation. The side peaks are explained as evidence for the positronium center-of-mass wave function being a Bloch function, i.e., that positronium is delocalized in ice.
U2 - 10.1103/PhysRevB.4.71
DO - 10.1103/PhysRevB.4.71
M3 - Journal article
SN - 1550-235X
SN - 2469-9969
VL - 4
SP - 71
EP - 73
JO - Physical Review B
JF - Physical Review B
IS - 1
ER -