Tootfinder

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
https://arxiv.org/abs/2507.21946 https://arxiv.org/pdf/2507.21946 https://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.
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Intern kritik mot von der Leyen om Gaza: ”Avspeglar nationella känslor” https://www.dn.se/varlden/intern-kritik-mot-von-der-leyens-linje-om-gaza-avspeglar-nationella-kanslor/

Intern kritik mot EU:s Ursula von der Leyens linje om Gaza
Intern kritik mot Ursula von der Leyens linje om Gaza: ”Avspeglar nationella känslor”, menar spanska EU-kommmissionären Teresa Ribera.

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…

Lightcurves of stars in the Chamaeleon I Association
Star-forming regions are essential for studying very young stellar objects of various masses. They still contain a significant amount of dust and gas. We present a study of light curves of stars in the field of the Chamaeleon I association. We use automatic spectral classification with MKCLASS to identify the spectral types of the stars in the field with a light curve from the NEOWISE and Gaia surveys. The light curves are analysed using the software Peranso and astropy. We also used VSX to ide…

I remember thinking somewhere around the mid seventies that Springsteen and the E Street Band, was like a version of Phil Lynott and Thin Lizzy.
But Phil Lynott did it with a lot less verses.
And this was from this side of the Atlantic, it took a long while to appreciate Springsteen more, perhaps 30 years longer.
Maybe because I kept Van Morrison (another Irishman), so close from the early 70's.
And then again watching this 75 gig on BBC 2 I'm mostly thinkin…

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.

"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." https://www.dn.se/varlden/attaariga-sela-i-gaza-forstar-inte-varfor-hon-inte-far-mat/

Åttaåriga Sela i Gaza förstår inte varför hon inte får mat
En bild har fastnat på Mohammed Mansours näthinna. Den föreställer en tvåårig pojke i Gaza som han försökte rädda från att svälta ihjäl. Det gick inte.

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

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

Detection of CO$_2$, CO, and H$_2$O in the atmosphere of the warm sub-Saturn HAT-P-12b
The chemical composition of warm gas giant exoplanet atmospheres (with Teq < 1000 K) is not well known due to the lack of observational constraints. HAT-P-12 b is a warm, sub-Saturn-mass transiting exoplanet that is ideal for transmission spectroscopy. One transit of HAT-P-12 b was observed with JWST NIRSpec in the 2.87-5.10 $μ$m range with a resolving power of $\sim$1000. The JWST data are combined with archival observations from HST WFC3 covering the 1.1-1.7 $μ$m range. The data are analyse…

Adaptive Bayesian Data-Driven Design of Reliable Solder Joints for Micro-electronic Devices
Leo Guo, Adwait Inamdar, Willem D. van Driel, GuoQi Zhang
https://arxiv.org/abs/2507.19663

Adaptive Bayesian Data-Driven Design of Reliable Solder Joints for Micro-electronic Devices
Solder joint reliability related to failures due to thermomechanical loading is a critically important yet physically complex engineering problem. As a result, simulated behavior is oftentimes computationally expensive. In an increasingly data-driven world, the usage of efficient data-driven design schemes is a popular choice. Among them, Bayesian optimization (BO) with Gaussian process regression is one of the most important representatives. The authors argue that computational savings can be …

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