Differential cross sections for ionization of atomic hydrogen by antiprotons
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Differential cross sections for ionization of atomic hydrogen by antiprotons A. I. Bondarev1,2 4,5,6 ¨ Th. Stohlker
· Y. S. Kozhedub2 · I. I. Tupitsyn2 · V. M. Shabaev2 · G. Plunien3 ·
© Springer Nature Switzerland AG 2019
Abstract We consider ionization of atomic hydrogen by antiproton impact. Doubly differential cross sections for ionization calculated within a recently developed semiclassical approach by Bondarev et al. (Phys. Rev. A 95, 052709, 2017) are presented. Comparison of the obtained results with other theoretical predictions is given. Keywords Antiproton-hydrogen collision · Ionization · Differential cross sections PACS 34.10. + x · 34.50.Fa
1 Introduction For a long time antiproton collisions with atomic and molecular targets are a subject for investigation at the European Centre for Nuclear Research (CERN) [1, 2]. In the future, a wide experimental program involving collisions of antiprotons with various targets will also be realized at the Facility for Antiproton and Ion Research (FAIR) [3, 4]. Collisions
This article is part of the Topical Collection on Proceedings of the 13th International Conference on Low Energy Antiproton Physics (LEAP 2018) Paris, France, 12-16 March 2018 Edited by Paul Indelicato, Dirk van der Werf and Yves Sacquin A. I. Bondarev
[email protected] 1
Center for Advanced Studies, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
2
Department of Physics, St. Petersburg State University, 199034 St. Petersburg, Russia
3
Institut f¨ur Theoretische Physik, Technische Universit¨at Dresden, D-01062 Dresden, Germany
4
GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
5
Helmholtz-Institute Jena, D-07743 Jena, Germany
6
Institut f¨ur Optik und Quantenelektronik, Friedrich-Schiller-Universit¨at, D-07743 Jena, Germany
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Hyperfine Interact
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of antiprotons with matter are vital for formation of exotic species like protonium, antiprotonic helium and more complex structures [5, 6]. Collisions of antiprotons with laser-cooled anions can be used for production of cold antihydrogen, an ideal system for testing the CP T invariance and weak equivalence principle [7]. Detailed cross sections for ionization in antiproton collisions with atoms and molecules can be valuable for vacuum restrictions in future experiments. Besides fundamental interest, collisions of antiprotons with simple atomic and molecular systems are important in medicine applications [8, 9]. Development of the advanced experimental techniques such as COLTRIMS (Cold target recoil ion momentum spectroscopy) [10, 11] and MOTReMi (Magneto-optical trap reaction microscope) [12, 13] made possible to measure differential cross sections for ionization in ion-atom and ion-molecule collisions [14–17]. Increased intensities of antiproton beams at new facilities may also make feasible kinematically complete experiments for antiprotonimpact ionization of simple systems. Antiproton-impact ionization of atomic hydrogen attracted a lot o
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