Production and study of antideuterium with the GBAR beamline
Year: 2025
Type: article
Abstract: The potential of circulating antideuterons ( $$\mathrm {\overline{d}}$$ d ¯ ) in the AD/ELENA facility at CERN is under active investigation. Approximately 100 $$\mathrm {\overline{d}}$$ d ¯ per bunch could be delivered as a $${100\,\textrm{keV}}$$ 100 keV beam based on measured cross-sections. These $$\mathrm {\overline{d}}$$ d ¯ could be further decelerated to $${12\,\textrm{keV}}$$ 12 keV using the GBAR scheme, enabling the synthesis of antideuterium ( $$\mathrm {\overline{D}}$$ D ¯ ) via charge exchange with positronium, a technique successfully demonstrated with $${6\,\textrm{keV}}$$ 6 keV antiprotons for antihydrogen production. The AD/ELENA facility is currently studying the possibility of increasing the $$\mathrm {\overline{d}}$$ d ¯ rate using an optimized new target geometry. Assuming this is feasible, we propose further enhancing the anti-atom production by using laser-excited positronium in the 2P state within a cavity, which is expected to increase the $$\mathrm {\overline{D}}(2S)$$ D ¯ ( 2 S ) production cross-section by almost an order of magnitude for $$\mathrm {\overline{d}}$$ d ¯ with $${2\,\textrm{keV}}$$ 2 keV energy. We present the projected precision for measuring the antideuterium Lamb shift and extracting the antideuteron charge radius, as a function of the beam flux. Graphical abstract $$\mathrm {\overline{D}}$$ D ¯ production rate assuming 1e9 ortho- $$\textrm{Ps}$$ Ps from a flat target interact with $$\mathrm {\overline{d}}$$ d ¯ with $${12\,\mathrm{\text {k}\text {eV}}}$$ 12 k (blue) or inside a cavity (orange). Within the cavity, $$\textrm{Ps}$$ Ps can be excited to the 2P state, further increasing the charge exchange cross-section for $$\mathrm {\overline{d}}$$ d ¯ at $${2\,\mathrm{\text {k}\text {eV}}}$$ 2
Source: The European Physical Journal D
Authors: Philipp Blumer, Ben Ohayon, Paolo Crivelli
Language: English
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,790
OpenAlex ID: W4408102290