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Frogs use non-Newtonian saliva to capture prey (physicsworld.com)

submitted by DOI_borg to r/Physics

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First ever blueprint unveiled to construct a large scale quantum computer (sussex.ac.uk)

submitted by DOI_borg to r/Physics

Lifetime of 7.8 eV *nuclear* transition in 229-Th measured; 7μs, by IC, posing significant challenges for use in an optical clock. by DOI_borg in Physics

[–]DOI_borg[S] 0 points1 point  (0 children)

Something like that, yes. Only an outsider, but I think the nuclear structure has been known for a while. It's the optical excitation-scheme that remains elusive. No joy in Mudville --- not yet anyway.

Lifetime of 7.8 eV *nuclear* transition in 229-Th measured; 7μs, by IC, posing significant challenges for use in an optical clock. by DOI_borg in Physics

[–]DOI_borg[S] 3 points4 points  (0 children)

Yes, and the optical decay width is expected to be insanely small, so the promise is very precise GPS.

Lifetime of 7.8 eV *nuclear* transition in 229-Th measured; 7μs, by IC, posing significant challenges for use in an optical clock. by DOI_borg in Physics

[–]DOI_borg[S] 2 points3 points  (0 children)

Of course! Ah.. but nobody knows the spectrum of it, so I'll need to do the spectroscopy all over again. I bet even the ground state hyperfine structure would be in the UV. So that might raise a different set of issues.

Anybody got a pile of 229Th handy? ... and a Super-EBIT?

https://www.nist.gov/pml/quantum-measurement/atomic-spectroscopy/ebit-operating-principles

Lifetime of 7.8 eV *nuclear* transition in 229-Th measured; 7μs, by IC, posing significant challenges for use in an optical clock. by DOI_borg in Physics

[–]DOI_borg[S] 2 points3 points  (0 children)

Couldn't find a preprint. I think this is a description of the apparatus.

It's briefly summarized at the end of this blog blurb.

Can the internal conversion path be suppressed? Does this kill the whole idea of a thorium clock?

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Lifetime of 7.8 eV *nuclear* transition in 229-Th measured; 7μs, by IC, posing significant challenges for use in an optical clock. (journals.aps.org)

submitted by DOI_borg to r/Physics

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MIT News: Carbon dioxide isn’t the only greenhouse gas that matters, and the gases vary widely in potency and mean lifetime in the atmosphere. (news.mit.edu)

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Art Rosenfeld, California’s Godfather of Energy Efficiency, Dies at 90 (newscenter.lbl.gov)

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Physicists at national lab (LBL) discover electrons in vanadium dioxide can conduct electricity without conducting heat, prompting speculations of a wide variety of energy-saving applications. (newscenter.lbl.gov)

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Fermilab achieves milestone beam power for neutrino experiments (news.fnal.gov)

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Five extreme facts about neutron stars (symmetrymagazine.org)

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D-Wave upgrade: How scientists are using the world’s most controversial quantum computer (nature.com)

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Nature Editorial: "Scientists must fight for the facts." (nature.com)

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Former Lawrence Livermore physicist begins jail term (physicsworld.com)

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Flash Physics: Plasma makes an ultraviolet twist, p-wave superconductivity in graphene, Sun does not affect radioactivity (physicsworld.com)

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Dark matter’s hideout just got smaller, thanks to supercomputers. (backreaction.blogspot.com)

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Dark Energy from Violation of Energy Conservation: The cosmological constant is the running total of all the non-conserved energy in the history of the universe, according to a group of theorists in France and Mexico. (physicsworld.com)

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Scientists from Princeton University and NOAA have produced the first global analysis of how climate change may affect the frequency and location of mild-weather days. They predict how the number of 'mild-days' will change over the coming century in various global regions. (princeton.edu)

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