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Publikováno v:
Physics Letters A. 305:190-195
A classical fluid description is used to investigate nonlinear interactions between an electron-type neutrino beam and a relativistic collisionless unmagnetized electron–positron plasma. It is shown that during the interaction a large amplitude wak
Publikováno v:
Physics Letters A. 212:221-226
Measurements of energy distributions and reemission probabilities of epithermal positrons leaving Ag(100) are presented for incident positron energies E between 50 and 3000 eV. The width of the energy spectra increases as E decreases; about 18% of th
Autor:
Norbert Grün, Gustavo Deco
Publikováno v:
Physics Letters A. 143:387-392
For the calculation of the production of electron-positron pairs in ion-ion collisions at high energies we have formulated a continuum distorted wave model. Angular distributions of the emitted leptons are shown and discussed.
Autor:
V.G. Baryshevskii, V.V. Thikhomirov
Publikováno v:
Physics Letters A. 96:215-218
It is shown that the production of transversally polarized electrons and positrons by unpolarized γ-quanta with energies of tens and hundreds of GeV, is possible in thin crystal plates.
Autor:
K.F. Canter, M. Fishbein
Publikováno v:
Physics Letters A. 55:398-400
Positron lifetime spectra were measured in 3 He for temperatures 3–16 K and densities 120–432 amagat. Free positron and positron- 3 He clusters, as well as positronium induced cavities in the gas, are observed. Data are compared with previous wor
Publikováno v:
Physics Letters A. 125:44-46
We report semiclassical (impact-parameter) and classical cross sections for antihydrogen formation in collisions between antiprotons p and positronium atoms Ps computed in the intermediate energy range 2–100 keV lab for antiprotons.
Autor:
Miroslav Pardy
Publikováno v:
Physics Letters A. 94:30-32
The rate of electron-positron pair creation and rho-meson creation by uniformly moving charges in condensed matter is calculated in the framework of the Schwinger source theory.
Autor:
Daphne F. Jackson
Publikováno v:
Physics Letters A. 105:292-294
The meso-molecular model of pion or muon capture involves a parameter which represents the probability of de-excitation from the molecular orbital to an atomic orbital centred on a particular atom. This parameter depends on the fractional ionic chara
Publikováno v:
Physics Letters A. 64:141-143
The nature of C centres in NaCl has been experimentally studied by the positron annihilation technique. The results are in support of a previously proposed model for the C centres [1]. The approximate size of C centres has been estimated to be of the
Publikováno v:
Physics Letters A. 104:143-145
The absolute cross section for the production of electron-positron pairs by 1.077 MeV photons on lead was measured as 2.04 ± 0.10 mb. The ratio σ (exp)/ σ (theor) = 1.5. This represents the closest to threshold measurement for Z = 82.