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Monoenergetic (e+e-) pairs from heavy ion collisions
(1988)
Energy and angular correlations of (e+e-) pairs emitted in HI collisions were investigated. Some evidence is found for a weak peak at 815±5keV in the (e+e-) sum-energy spectrum obtained for θe+c- = 180° ± 18° (FWHM). The ...
Narrow positron lines from U-U and U-Th collisions
(1984)
Spectra of positrons emitted in heavy-ion-atom collisions close to the Coulomb barrier were measured. The data exhibit broad energy distributions according to expectations for induced positron creation by the strong ...
On the production mechanism of the narrow positron lines observed in heavy-ion collisions
(1987)
Following a suggestion of Bang et al. we deduce that the total energy transfer associated with the narrow positron lines observed in heavy-ion collisions is given approximately by the sum of the rest masses of the positron ...
On the scattering-angle dependence of the monochromatic positron emission from U + U and U + Th collisions
(1985)
The narrow positron lines emitted in U + Th and U + U collisions were investigated with respect to their dependence on the heavy-ion scattering angle Θp. For U + U collisions also the excitation function was measured which ...
High-sensitivity measurements of the excitation function for Bhabha scattering at MeV energies
(1989)
Using a monochromatic e+ beam scattered on a Be foil and a high-resolution detector device, the excitation function for elastic e+e- scattering was measured with a statistical accuracy of 0.25% in 1.4-keV steps in the ...
New limits for resonant Bhabha scattering around the invariant mass of 1.8 MeV/c2
(1988)
The excitation function for Bhabha scattering was reinvestigated in the energy range between 775 and 840 keV (c.m.) in 1.4 keV steps using a monoenergetic e+ -beam and a high-resolution kinematic coincidence detector device. ...
Sensitive search for neutral resonances in Bhabha scattering around 1.8 MeV/c2
(1988)
The excitation function for Bhabha scattering was measured in the energy range between 760 and 840 keV (CM) in 1.4 keV steps with beams of monochromatic positrons scattered on a Be foil at angles between 79° and 101° (CM). ...
Multiple positron structures observed from U-U collisions at 5.6 MeV/u and 5.9 MeV/u
(1987)
High resolution positron spectroscopy in U-U collisions at bombarding energies of 5.6 MeV/u, the lowest energy studied until now as well as of 5.9 MeV/u, reveals similar multiple structures between 220 keV and 385 keV ...
Positron lines from subcritical heavy ion-atom collisions
(1987)
Positron lines were observed in heavy ion-atom collisions at bombarding energies close to the Coulomb barrier in subcritical systems with the sum of the atomic numbers of the colliding nuclei Zu=Z1+Z2 being smaller than ...
On the momentum correlation of (e+e-) pairs observed in U + U and U + Pb collisions
(1989)
First results on the energy and angular dependence of the (e+e-) pairs, emitted from U + U and U + Pb collisions at a beam energy of 5.9 MeV/u, are presented. The (e+e-) coincidence measurements were carried out utilizing ...