Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact

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Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact

H. Gassert, O. Chuluunbaatar, M. Waitz, F. Trinter, H.-K. Kim, T. Bauer, A. Laucke, Ch. Müller, J. Voigtsberger, M. Weller, J. Rist, M. Pitzer, S. Zeller, T. Jahnke, L. Ph. H. Schmidt, J. B. Williams, S. A. Zaytsev, A. A. Bulychev, K. A. Kouzakov, H. Schmidt-Böcking, R. Dörner, Yu. V. Popov, and M. S. Schöffler

Phys. Rev. Lett. 116, 073201 – Published 17 February 2016

Abstract

Even though the study of ion-atom collisions is a mature field of atomic physics, large discrepancies between experiment and theoretical calculations are still common. Here we present experimental results with high momentum resolution on the single ionization of helium induced by 1-MeV protons, and we compare these to theoretical calculations. The overall agreement is strikingly good, and even the first Born approximation yields good agreement between theory and experiment. This has been expected for several decades, but so far has not been accomplished. The influence of projectile coherence effects on the measured data is briefly discussed in terms of an ongoing dispute on the existence of nodal structures in the electron angular emission distributions.

Received 4 September 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.073201

Physics Subject Headings (PhySH)

Atomic & molecular collisions Scattering theory

Atomic, Molecular & Optical

Authors & Affiliations

H. Gassert¹, O. Chuluunbaatar^2,3, M. Waitz¹, F. Trinter¹, H.-K. Kim¹, T. Bauer¹, A. Laucke¹, Ch. Müller¹, J. Voigtsberger¹, M. Weller¹, J. Rist¹, M. Pitzer¹, S. Zeller¹, T. Jahnke¹, L. Ph. H. Schmidt¹, J. B. Williams⁴, S. A. Zaytsev⁵, A. A. Bulychev², K. A. Kouzakov⁶, H. Schmidt-Böcking¹, R. Dörner¹, Yu. V. Popov^2,7, and M. S. Schöffler^1,*

¹Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
²Joint Institute for Nuclear Research, Dubna, Moscow region 141980, Russia
³Institute of Mathematics, National University of Mongolia, 210646 Ulaanbaatar, Mongolia
⁴Department of Physics, University of Nevada, Reno, Nevada 89557, USA
⁵Department of Physics, Pacific State University, Tikhookeanskaya 136, Khabarovsk 680035, Russia
⁶Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia
⁷Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia

^*schoeffler@atom.uni-frankfurt.de

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Issue

Vol. 116, Iss. 7 — 19 February 2016

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