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@@arXiv_physicsatomph_bot@mastoxiv.page@mastoxiv.page
2025-07-30 08:41:51

Study of thorium in hypersonic gas jets: Ionization potentials of Th and Th$^ $
A. Claessens, F. Ivandikov, M. Brasseur, A. Dragoun, Ch. E. D\"ullmann, R. Ferrer, Yu. Kudryavtsev, P. Palmeri, P. Quinet, S. Raeder, D. Renisch, P. Van den Bergh, P. Van Duppen
arxiv.org/abs/2507.21946 arxiv.org/pdf/2507.21946 arxiv.org/html/2507.21946
arXiv:2507.21946v1 Announce Type: new
Abstract: Laser ionization spectroscopy was performed on both neutral and singly ionized $^{232}$Th with the aim of identifying the nuclear-clock isomer in the singly charged ionic state of $^{229}$Th. A search for an efficient laser ionization scheme of $^{232}$Th$^ $ was conducted in an argon-filled gas cell. This revealed a congested spectrum due to collisional quenching effects and the presence of several auto-ionizing states, one of which has a laser ionization efficiency of at least $1.2 \%$. Using a threshold approach, the second ionization potential was determined to be $12.300(9)\,$eV. The subsequent study on atomic $^{232}$Th validated the threshold approach. Conducting spectroscopy in a hypersonic gas jet, suppressed the gas-collision-induced quenching, revealing a Rydberg series that converges to the first ionization potential, determined to be $6.306879(14)\,$eV. The gas jet also cools down the thorium, allowing for high-resolution laser spectroscopy with a resolution of $240(30)\,$MHz. Using the Multiconfigurational Dirac-Hartree-Fock (MCDHF) method, the ionization potentials were computed, showing a relative difference of 0.06\% and 0.19\% between theory and our experimental values for the ionization potentials of Th and Th$^ $ respectively. Further calculations using a pseudo-relativistic Hartree-Fock method reveal strong mixing in the used intermediate state at $26113.27\,$cm$^{-1}$ of Th. A dedicated fast-extraction gas cell with $^{233}$U recoil sources was used to study $^{229}$Th$^ $ but no photo-ionization signal could be observed.
toXiv_bot_toot

@erikdelareguera@mastodon.nu
2025-07-31 16:10:09

Intern kritik mot von der Leyen om Gaza: ”Avspeglar nationella känslor” dn.se/varlden/intern-kritik-mo

@arXiv_astrophSR_bot@mastoxiv.page
2025-07-30 09:49:31

Lightcurves of stars in the Chamaeleon I Association
K. Neumannov\'a (Department of Theoretical Physics and Astrophysics - Masaryk University, Kotl\'a\v{r}sk\'a 2, Brno, Czechia), L. Kue{\ss} (Department of Astrophysics - University of Vienna, T\"urkenschanzstra{\ss}e 17, Vienna, Austria), E. Paunzen (Department of Theoretical Physics and Astrophysics - Masaryk University, Kotl\'a\v{r}sk\'a 2, Brno, Czechia), K. Bernhard (Bundesdeutsche Arbeitsgemeinschaft f\&q…

@heiseonline@social.heise.de
2025-06-26 11:32:00

heise | Strom, Wasser, Gas: Messgeräte und Zähler für Zuhause – Kurztests
Wir testen den kompakten Stromzähler 3EM-63T Gen3 von Shelly, den Tuehakny Wasserstandsmelder und den Tasmota-Gaszähler Smartnetz Smart Gas Reader SCE 2.0.

@erikdelareguera@mastodon.nu
2025-07-31 14:26:58

"Nu försöker jag och min fru laga vad som helst, bara det mättar våra döttrar en stund, även om det är dålig näring. Vad som helst, bara de kan sova på natten." dn.se/varlden/attaariga-sela-i

@krone@frawas.de
2025-05-30 13:53:50

Aus und vorbei - Modehersteller Gerry Weber schließt alle Geschäfte #News #Nachrichten

@vosje62@mastodon.nl
2025-07-27 22:34:07

Voedselhulp Gaza uit de lucht en over land komt op gang na gevechtspauze – aantal hongerdoden blijft oplopen | de #Volkskrant

Om de bevolking van de verwoeste enclave één maaltijd per dag te brengen zijn 120 vrachtwagens nodig – of, berekent de BBC, 160 hulpvluchten, een hoeveelheid waarbij de paar droppings van zaterdag en zondag volkomen in het niet vallen. Ook de 120 vrachtwagens worden nog bij lange na niet gehaald. Volgens het World Food Programme van de Verenigde Naties heeft Israël afgelopen week 85 vrachtwagens per dag Gaza binnengelaten.
@arXiv_astrophEP_bot@mastoxiv.page
2025-07-28 08:37:41

Detection of CO$_2$, CO, and H$_2$O in the atmosphere of the warm sub-Saturn HAT-P-12b
N. Crouzet, B. Edwards, T. Konings, J. Bouwman, M. Min, P. -O. Lagage, R. Waters, J. P. Pye, L. Heinke, M. Guedel, Th. Henning, B. Vandenbussche, O. Absil, I. Argyriou, D. Barrado, A. Boccaletti, C. Cossou, A. Coulais, L. Decin, R. Gastaud, A. Glasse, A. M. Glauser, F. Lahuis, G. Olofsson, P. Patapis, D. Rouan, P. Royer, N. Whiteford, L. Colina, G. \"Ostlin, T. P. Ray, E. F. van Dishoeck

@arXiv_astrophGA_bot@mastoxiv.page
2025-07-29 07:44:21

Observed Timescales of Stellar Feedback in Star-Forming, Low-Mass Galaxies
Laura C. Hunter, Liese van Zee, Roger E. Cohen, Kristen B. McQuinn, Madison Markham, Justin A. Kader, Lexi N. Gault, Andrew E. Dolphin
arxiv.org/abs/2507.19573

@krone@frawas.de
2025-05-30 13:53:50

Aus und vorbei - Modehersteller Gerry Weber schließt alle Geschäfte #News #Nachrichten