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Two-Body Hadronic Densities From The Four-Body Wave Functions For The Hydrogen-Antihydrogen System
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Theoretical Chemistry.ORCID iD: 0000-0002-2849-8096
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The quantum-mechanical four-body problem for the hydrogen-antihydrogen system has beensolved by means of the variational implementation of the coupled-arrangement channel method.The wave functions have been formed using the Gaussian expansion method (GEM) in Jacobi co-ordinates; they explicitly include components corresponding to the rearrangement from hydrogen and antihydrogen (H + H') into Protonium and Positronium (Pn + Ps). We analyse the solutionsbelonging to the discretized spectrum of the 4-body eigenvalue problem at energies correspondingto the low energy H { Hcollisions. Two-body nuclear correlation functions are calculated from thefour-body wave functions, as to investigate the proton-antiproton motion in the region of rearrangement from H+H' to Pn+Ps. We monitor the adiabatic versus nonadiabatic behavior of the system asa function of internuclear separation and nd that outside the rearrangement region the adiabaticdescription is quite adequate. The nonadiabatic behavior signicantly in uences the nuclear motionin the rearrangement region and reduces the rate of proton-antiproton annihilation in low-energy hydrogen-antihydrogen collisions.

Keywords [en]
antimatter, hydrogen-antihydrogen system, antihydrogen
National Category
Theoretical Chemistry
Research subject
Chemistry with specialization in Quantum Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-351304OAI: oai:DiVA.org:uu-351304DiVA, id: diva2:1209389
Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-05-23
In thesis
1. MATTER-ANTIMATTER INTERACTIONS: The hydrogen-antihydrogen system and antiproton-matter interactions
Open this publication in new window or tab >>MATTER-ANTIMATTER INTERACTIONS: The hydrogen-antihydrogen system and antiproton-matter interactions
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ever since antiparticles were discovered their nature has been something of a mystery. They were postulated to be identical to regular particles except for having opposite charge, but this would imply that an equal amount of antiparticles and particles should have been created at the beginning of time. However, everywhere we look the Universe seems to be constituted of regular particles, giving rise to the question whether there is something else that differentiates antiparticles from regular particles, or if there is something amiss in the Standard Model of particle physics.

This thesis focuses on a central system of study in this field, the hydrogen-antihydrogen system and the theory surrounding it, as well as an expansion into systems with an antiproton interacting with small molecules, bridging the fields of quantum physics and quantum chemistry.

Methods expanding on the Born-Oppenheimer approximation for the interaction between the two atoms are presented. The resulting 2-body interaction potential is then used for creating a part of the basis in a non-adiabatic 4-body method in order to look for resonance states whose existence could impact cross-sections of hydrogen-antihydrogen scattering. The eigenfunctions obtained from the non-adiabatic method are used by extracting the 2-body hadronic density function and comparing it to the adiabatic wave function, for measuring the adiabaticity of the hydrogen-antihydrogen system.

The antiproton-matter interaction is first investigated by a quantum dynamical approach of an antiproton scattering on molecular hydrogen, common products in high-energy collision experiments, continued by a study of the potential energy surfaces of an antiproton interacting with a range of functional groups present in the human body.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 103
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1674
Keywords
antimatter, antiproton, matter-antimatter interactions, hydrogen-antihydrogen system
National Category
Theoretical Chemistry
Research subject
Chemistry with specialization in Quantum Chemistry
Identifiers
urn:nbn:se:uu:diva-348667 (URN)978-91-513-0348-2 (ISBN)
Public defence
2018-06-13, Room Å4001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2018-05-18 Created: 2018-04-22 Last updated: 2018-10-08

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