Fayer, SE;
Loreti, A;
Andersen, SL;
Koever, A;
Laricchia, G;
(2016)
Magnetic field-free measurements of the total cross section for positrons scattering from helium and krypton.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
, 49
(7)
10.1088/0953-4075/49/7/075202.
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Abstract
An electrostatic beam has been used to perform scattering measurements with an angular-discrimination of $\lesssim 2^\circ $. The total cross sections of positrons scattering from helium and krypton have been determined in the energy range (10–300) eV. This work was initially stimulated by the investigations of Nagumo et al (2011 J. Phys. Soc. Japan 80 064301), the first positron field-free measurements performed with a similarly high resolution, which found significant discrepancies at low energies with most other experiments and theories. The present results show good agreement with theories and several other measurements, even those characterized by a much poorer angular discrimination, implying a small contribution from particles elastically scattered at forward angles, as theoretically predicted for He but not for Kr.
| Type: | Article |
|---|---|
| Title: | Magnetic field-free measurements of the total cross section for positrons scattering from helium and krypton |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/0953-4075/49/7/075202 |
| Publisher version: | http://dx.doi.org/10.1088/0953-4075/49/7/075202 |
| Language: | English |
| Additional information: | Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| Keywords: | Science & Technology, Physical Sciences, Optics, Physics, Atomic, Molecular & Chemical, Physics, positron beam, brightness enhancement, electrostatic transport, positron scattering, helium, krypton, total cross section, LOW-ENERGY POSITRONS, RARE-GASES, PRECISION-MEASUREMENT, NEON ATOMS, INTERMEDIATE, COLLISIONS, KR, MOLECULES, IMPACT, ARGON |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1554468 |
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