Forgot your password?
Close
typodupeerror

Submission + - First Nuclear Clocks Start Ticking in Vienna and Beijing (phys.org)

Submitted by necro81
necro81 writes: Two groups, one in Vienna and one in Beijing, have successfully demonstrated the world's first nuclear clocks. Standard atomic clocks, like the caesium clocks that define the second, operate by observing the transition of electrons between different orbits about the nucleus. The resulting radiation is usually in the microwave range, and can produce clocks accurate to one second in 100 billion years.

Nuclear clocks go a step further, and probe energy transitions within the nucleus itself. Nuclei can arrange their protons and neutrons into different configurations, called isomers. The isomer with the lowest energy is the one usually found; higher-energy ones are only metastable and decay quickly. Usually it takes serious energy — x-rays and gamma rays — to excite a nucleus into a higher-energy arrangement. It so happens that thorium-229 can be excited using UV light with a wavelength of 148 nm — just within the capabilities of some exotic lasers.

It's still been quite a challenge. For one thing, Th-229 is not found in nature; it must be extracted from the decay chain of uranium-235. The Beijing team used just a microgram mixed in a crystal of calcium fluoride.

Although these prototype nuclear clocks are not yet more accurate than existing atomic clocks (one second in millions, rather than billions, of years), they show the way towards what may be possible. Because the energy transition is in the nucleus, rather than the electron cloud, it is less susceptible to outside disturbances like magnetic fields. And the fundamental frequency is much higher (five orders of magnitude), which should yield more precise timing. This development could lead to smaller and more reliable time standards across the world (and solar system).

Submission + - Wisconsin U–Madison Prof Francis Halzen named 2026 Nobel laureate in physi (wisc.edu)

Submitted by schwit1
schwit1 writes: Halzen is the principal investigator of the NSF IceCube Neutrino Observatory, the world’s largest — and perhaps strangest — telescope. The U.S. National Science Foundation-funded observatory is operated by an international collaboration of scientists led by the Wisconsin IceCube Particle Astrophysics Center based at UW–Madison.

Embedded in a cubic kilometer of Antarctic ice, IceCube uses thousands of light sensors to survey the universe for neutrinos, nearly massless particles that rarely interact with other matter. Neutrinos provide information about the workings of black holes, galaxies and other objects in the cosmos.

“IceCube is like no other telescope in the world,” says UW–Madison interim Chancellor Eric M. Wilcots. “And there is no other scientist quite like Francis Halzen, whose idea to create a neutrino detector under almost a mile of ice has led to a remarkable multinational and multi-institutional scientific collaboration and a fundamental shift in how we think about the universe.”
Classic Games (Games)

OpenAI's GPT-6 Astra Gets Frustrated Losing At StarCraft And Decides To Cheat Instead (kotaku.com) 86

Posted by EditorDavid from the CheatGPT dept.
What happened when AI-created bots competed in the classic Blizzard videogame StarCraft? "Struggling to stay apace with its competitors, OpenAI's GPT-6 Astra apparently changed strategy mid-tournament and opted to cheat," Kotaku reports: StarSkirmish is an ongoing clash of AI developed bots in StarCraft: Brood War... Limited to playing as Protoss, each LLM is given an hour to develop a bot in C++, then have them build, harvest and fight on one of three maps... Yesterday, viewers watched as Claude and GPT went against each other and the human created bot Pluto... Struggling to get an edge through the day, [OpenAI's GPT-6 Astra] decided to do what LLMs do best: Lie, cheat and steal. The GPT-6 Astra bot downloaded and tagged in Stardust, a Protoss bot created by Bruce Mackenzie Nielsen back in 2020, considered one of the best of the bests. "I am rolling back GPT-6 Astra's code so its [sic] not contaminated and allowing it to continue," posted StarSkirmish creator Kai McPheeters.
That was Friday. But by Sunday, McPheeters was posting an update on social media. "Can GPT-6 Astra avoid going 0 — 1000?" Two hours later he replied to his own post. "The answer was no."

While AI companies "have repeatedly been accused of stealing the work of humans... I haven't seen an example quite so brazen," writes PC Magazine: While Astra's bot-based heist is innocuous in isolation, this is hardly the first time an OpenAI LLM has been caught attempting to cheat at a task. Indeed, the company's history of creating deceitful models stretches back almost a decade, to when an early AI model used glitches and exploits to improve its Sonic the Hedgehog completion times.

Comment Re:Perhaps of interest (Score 1) 90

by PCM2 (#66362896) Attached to: San Francisco's Car Crime Has Plunged. How Much Credit Does Flock Deserve?

The SF Democratic machine is all in on Flock [missionlocal.org]. That might have something to do with the Flock being in the SF Democratic Party.

The more I hear about this so-called "SF Democratic Party," the more I'm convinced they don't speak for the majority of SF voters. Seriously. They seem to be some strange, centrist organization that no voters belong to and nobody knows where they get their money from.

Slashdot Top Deals

The greatest productive force is human selfishness. -- Robert Heinlein

Close