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GRASIAN: towards the first demonstration of gravitational quantum states of atoms with a cryogenic hydrogen beam
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GRASIAN: towards the first demonstration of gravitational quantum states of atoms with a cryogenic hydrogen beam
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Journal Article
GRASIAN: towards the first demonstration of gravitational quantum states of atoms with a cryogenic hydrogen beam
2023
Overview
At very low energies, a light neutral particle above a horizontal surface can experience quantum reflection. The quantum reflection holds the particle against gravity and leads to gravitational quantum states (
gqs
). So far,
gqs
were only observed with neutrons as pioneered by Nesvizhevsky and his collaborators at
ill
. However, the existence of
gqs
is predicted also for atoms. The
Grasian
collaboration pursues the first observation and studies of
gqs
of atomic hydrogen. We propose to use atoms in order to exploit the fact that orders of magnitude larger fluxes compared to those of neutrons are available. Moreover, recently the
q
-
Bounce
collaboration, performing
gqs
spectroscopy with neutrons, reported a discrepancy between theoretical calculations and experiment which deserves further investigations. For this purpose, we set up a cryogenic hydrogen beam at 6
K
. We report on our preliminary results, characterizing the hydrogen beam with pulsed laser ionization diagnostics at 243
nm
.
Graphical abstract
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,EDP Sciences
