Magnetic field-free measurements of the total cross section for positrons scattering from helium and krypton

被引：12

作者：

Fayer, S. E. ^{[1
]}

Loreti, A. ^{[1
]}

Andersen, S. L. ^{[2
]}

Koever, A. ^{[3
]}

Laricchia, G. ^{[1
]}

机构：

[1] UCL, UCL Dept Phys & Astron, Gower St, London WC1E 6BT, England

[2] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[3] Hungarian Acad Sci, Inst Nucl Res, POB 51, H-4001 Debrecen, Hungary

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2016年 / 49卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

positron beam; brightness enhancement; electrostatic transport; positron scattering; helium; krypton; total cross section; INTERMEDIATE-ENERGY POSITRONS; RARE-GASES; PRECISION-MEASUREMENT; NEON; COLLISIONS; ATOMS; KR; AR; HE;

D O I：

10.1088/0953-4075/49/7/075202

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

An electrostatic beam has been used to perform scattering measurements with an angular-discrimination of less than or similar to 2 degrees. 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.

引用

页数：6

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