Journal Article/Contribution to a conference proceedings

FZJ-2026-03759

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Current developments of polarized sources and polarimeter at FZ Jülich and further applications

Engels, R. W. (Corresponding author)FZJ* ; Kannis, C. ; Salmann, J. ; Faatz, N. ; Pütz, S. J. ; El-Kordy, T.FZJ* ; Verhoeven, V. J.

2026

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Please use a persistent id in citations: doi:10.34734/FZJ-2026-03759

Abstract: A new theoretical concept of the quantum mechanical processes in spin filter for the separation ofmetastable hydrogen atoms in individual hyperfine substates enables a number of new applications.For example, it is now possible to build a new generation of Lamb-shift polarimeter that canseparate not only 𝛼 but also the 𝛽 substates with $𝑚_𝐽$ = −1/2. This opens up completely newpossibilities for the search of hydrogen atoms in forbidden substates after the bound beta decayof the neutron. At the same time, corresponding simulations also provide the parameters fordesigning a Lamb-shift polarimeter for $^3\text{𝐻𝑒}^+$ ions. Furthermore, it has recently been shown thatclassical Lamb-shift polarimeter can determine the polarization, in addition to protons/deuteronsand 𝐻/𝐷 atoms, of $𝐻_2/𝐷_2$ molecules as well as all possible ion beam species, i.e. 𝐻$^+_2$ / 𝐷$^+_2$ / 𝐻𝐷$^+$, 𝐻$^−$ / 𝐷$^−$ or even 𝐻$^+_3$.In parallel, this knowledge might help to create a new type of optically pumped polarized sourceby transferring a laser-induced polarization of the rotational magnetic moment to the nucleons in𝐻$_2$, 𝐷$_2$ and 𝐻𝐷 molecules. These techniques might also be used for the production and detectionof polarized fuel for the enhancement of the energy output of nuclear fusion reactors or theproduction of hyper-polarized probes in medicine.A recent application was a proof-of-principle measurement of the polarization conservation in 𝐻$_2$molecules after recombination of polarized atoms in a carbon-coated storage cell, similar to thecell that is foreseen for a planned polarized target at the LHCb experiment. In addition, in somemore exotic experiments the components of a Lamb-shift polarimeter can be used to detect axionsor “dark hydrogen”.

Keyword(s): Nuclei and Particles (1st) ; Nuclear Physics (2nd)

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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)
2. Institute of Technology and Engineering (ITE)
3. Experimentelle Hadronstruktur (IKP-1)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
2. DFG project G:(GEPRIS)533904660 - Eine vielseitige Polarisationsmethode für Teilchen mit einfachen Hyperfeinstrukturen (533904660) (533904660)

Appears in the scientific report 2026

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