{"id":684,"date":"2022-04-08T13:54:01","date_gmt":"2022-04-08T13:54:01","guid":{"rendered":"https:\/\/grasian.eu\/?page_id=684"},"modified":"2026-07-24T14:48:44","modified_gmt":"2026-07-24T14:48:44","slug":"news","status":"publish","type":"page","link":"https:\/\/grasian.eu\/?page_id=684","title":{"rendered":"News"},"content":{"rendered":"\t\t
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INTERNATIONAL WORKSHOP GRAVITY, SPECTROSCOPY AND INTERFERENCE WITH ATOMS AND NEUTRONS<\/span><\/p>

organised by Turku University 27.8. – 28.8.202. Details can be found here<\/a>.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Publication: Proposal for a cryogenic source of atomic tritium for neutrino-mass measurements and precision spectroscopy<\/h5>

23 Jul 2026 Proposal for a concept for a cryogenic source of atomic tritium at sub-Kelvin temperatures and energies suitable for magnetic trapping. The source is based on the dissociation of solid molecular T2 films below 1 K by electrons from a pulsed rf discharge, a technique recently demonstrated for atomic hydrogen, combined with buffer-gas cooling and magnetic confinement.<\/p>

A. Semakin et al., <\/em>Phys. Rev. Res.\u00a0<\/em>8<\/strong>, 033096 (2026),\u00a0doi.<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Publication: Gravitational and other shifts of whispering-gallery and gravitational state interference patterns of light neutral particles<\/h4>

8 Jul 2026 This paper discusses the interference patterns of gravitational and whispering gallery quantum states that can be observed with neutrons, atoms, antiatoms, muonium (Mu), positronium (Ps), and other light neutral particles. A gravitational shift of interference patterns of neutron gravitational and whispering-gallery states can be easily observed with cold, very cold, or ultracold neutrons. The developed methods can be used for observing\/searching for other shifts in fundamental neutron physics experiments, for instance, for measuring the gravitational constant or constraining the neutron electric charge<\/p>

V.V. Nesvishevsky et al., New J. Phys. 28, 073902 (2026), doi.<\/a><\/p><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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INTERNATIONAL WORKSHOP GRAVITY, SPECTROSCOPY AND INTERFERENCE WITH ATOMS AND NEUTRONS<\/span><\/p>

organised by Turku University 30.6. – 2.7.2025.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Cold source of atomic hydrogen for loading large magnetic traps<\/h4>

19 Dec 2024 We present a design and performance tests of an intense source of cold hydrogen atoms for loading large magnetic traps. Our source is based on a cryogenic dissociator of molecular hydrogen at 0.6 K followed by a series of thermal accommodators at 0.5, 0.2 and 0.13 K with inner surfaces covered by a superfluid helium film. All components are thermally anchored to corresponding stages of a dilution refrigerator. The source provides a continuous flux of 7 \u00d7 10^13 H atoms\/s in a temperature range of 130-200 mK.<\/p>

A. Semakin et al., Eur. Phys. J. D (2025) 79, 23. doi<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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GRASIAN: shaping and characterization of the cold hydrogen and deuterium beams for the forthcoming first demonstration of gravitational quantum states of atoms<\/h4>\n\n16 Dec 2024 New publication: \u00a0Our recent measurement results on the collimation of the hydrogen beam to 2 mm, the reduction of background and improvement of signal-to-noise and finally our first detection of atoms with velocities < 72 ms\u22121 are presented. Furthermore, we show calculations, estimating the feasibility of the planned experiment and simulations which confirm that we can select vertical velocity components in the order of cm s\u22121.\n\nEur. Phys. J. D (2024)78:132 doi<\/a>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Collaboration meeting 2023<\/strong><\/h4>\n
The next collaboration meeting will be held on April 13-14, 2023, at ETH Z\u00fcrich.<\/div>

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Program <\/a>(restricted access)
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GRASIAN: Towards the first demonstration of gravitational quantum states of atoms with a cryogenic hydrogen beam<\/h4>
31.01.2023<\/i> A preprint <\/a>describing ongoing experiments towards observing gravitational quantum states of hydrogen has been submitted as part of the proceedings of the PSAS2022 <\/a>conference.<\/div>
29.03.2023 <\/em>Paper was published under C. Killian et al., Eur. Phys. J. D<\/span> (2023) 77:50 <\/span>link<\/a><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Publication: A Trap for ultra-cold atomic hydrogen<\/b><\/h4>
03.02.2022<\/i> The GRASIAN collaboration\u00a0 published the description of a \u201cLarge-volume magnetic trap for studying ultracold atomic hydrogen<\/i>\u201d in the journal Review of Scientific Instruments. The device allows creating large volumes of atomic hydrogen at millikelvin temperatures. Its development is a mile stone towards producing ultra-cold hydrogen for the observation of gravitational quantum states of hydrogen, which have a large potential for precision optical and microwave spectroscopy as well as searches for short-range forces originating from effects beyond the Standard Model of particle physics like dark matter. The publication is featured on the journal front page, web page, and in a Scilight <\/span>https:\/\/doi.org\/10.1063\/10.0009561<\/span><\/a>. The full article is available at <\/span>https:\/\/doi.org\/10.1063\/5.0070037<\/span><\/a>. <\/span><\/div>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Hydrogen atoms with velocity below 50 m\/s observed<\/h4>
01.09.2021<\/i> In an experiment at ETH Z\u00fcrich GRASIAN members observed very slow atomic hydrogen atoms in a cold beam which are needed to observed gravtiational quantum states of hydrogen for the first time. The results were presented at the joint Austrian and Swiss Physical Society meeting in Innsbruck, Austria, by C. Killian. The presentation can be downloaded here<\/a>.<\/div>

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Publication: A magneto-gravitational trap for studies of gravitational quantum states<\/h4>\n
10.06.2020<\/i> A new publication by GRASIAN proposes a novel magneto-graviational trap for atoms, anti-atoms, and neutrons.  Nesvizhevsky, V. V. et al.<\/i> The European Physical Journal C<\/i> 123<\/b>, 1\u201310 (2020).<\/div>\n
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INTERNATIONAL WORKSHOP GRAVITY, SPECTROSCOPY AND INTERFERENCE WITH ATOMS AND NEUTRONS organised by Turku University 27.8. – 28.8.202. Details can be […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"full-width-page.php","meta":[],"_links":{"self":[{"href":"https:\/\/grasian.eu\/index.php?rest_route=\/wp\/v2\/pages\/684"}],"collection":[{"href":"https:\/\/grasian.eu\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/grasian.eu\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/grasian.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/grasian.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=684"}],"version-history":[{"count":86,"href":"https:\/\/grasian.eu\/index.php?rest_route=\/wp\/v2\/pages\/684\/revisions"}],"predecessor-version":[{"id":915,"href":"https:\/\/grasian.eu\/index.php?rest_route=\/wp\/v2\/pages\/684\/revisions\/915"}],"wp:attachment":[{"href":"https:\/\/grasian.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}