Record-breaking neutrino is most energetic ever detected • Hacker News Board

Re: Record-breaking neutrino is most energetic ever detected

#131

Post by irchans » Thu, Feb 13, 2025, 1:18 PM UTC

dr_dshiv wrote: post #76

ziddoap wrote: post #5

Ars Technica has an article, as well, with some additional context/explanation. https://arstechnica.com/science/2025/02/most-energetic-neutr... And an interesting, somewhat related, video from PBS Space Time exploring how supernovas act as particle accelerators (but don't quite explain particles like this one or the 'Oh My God' particle): https://www.youtube.com/watch?v=2sSNWIJbV3Q

Neutrinos “interact with regular matter so rarely that it's estimated you'd need about a light-year of lead to completely block a bright source of them. Every one of us has tens of trillions of neutrinos passing through us every second, but fewer than five of them actually interact with the matter in our bodies in our entire lifetimes.” They have 1/500,000 the mass of electrons. They interact only through the super s…

Interesting "fact" - The total amount of lead in the universe is a somewhat less than a cubic light year.

Re: Record-breaking neutrino is most energetic ever detected

#132

Post by __MatrixMan__ » Thu, Feb 13, 2025, 1:50 PM UTC

Sharlin wrote: post #129

__MatrixMan__ wrote: post #114

Earlier quoted context omitted.

Not for that particular neutrino, it's gone. But yes, my home (and yours) is being heated by neutrino power as we speak. It's not a significant enough amount of energy to make a dent in the utility bill however.

Most inefficient thermal power plant possible: utilize the difference in neutrino flux between the hemisphere that's open to space vs. the hemisphere where Earth is in the way. But now I'm wondering what percentage of the useful thermal power in a nuclear power plant is produced by the neutrinos created in the reactions (the infinitesimally small fraction that happen to interact with the matter within the reactor, th…

On the contrary, it would have to be efficient indeed to do anything useful underneath all of the shielding that we'd need to keep those baser forms of radiation at bay. Gamma rays: yuck.

Re: Record-breaking neutrino is most energetic ever detected

#133

Post by e3bc54b2 » Thu, Feb 13, 2025, 3:24 PM UTC

cozzyd wrote: post #80

mr_toad wrote: post #62

Earlier quoted context omitted.

It’s very close to c though, close enough that it beats sending a signal around the Earth. The drawback is the impractical size and cost of a receiver.

Come on, we gotta convince the finance bros to find building better neutrino beams and detectors.

HFT peeps are Comfortable spending millions on custom high speed undersea cables to save few ms o'er request.

How about saving few hundred ms across the earth?

Re: Record-breaking neutrino is most energetic ever detected

#134

Post by sfn42 » Thu, Feb 13, 2025, 3:41 PM UTC

irchans wrote: post #131

dr_dshiv wrote: post #76

Earlier quoted context omitted.

Neutrinos “interact with regular matter so rarely that it's estimated you'd need about a light-year of lead to completely block a bright source of them. Every one of us has tens of trillions of neutrinos passing through us every second, but fewer than five of them actually interact with the matter in our bodies in our entire lifetimes.” They have 1/500,000 the mass of electrons. They interact only through the super s…

Interesting "fact" - The total amount of lead in the universe is a somewhat less than a cubic light year.

How could we possibly estimate that if we don't even know the size of the universe?

Re: Record-breaking neutrino is most energetic ever detected

#135

Post by LargoLasskhyfv » Thu, Feb 13, 2025, 4:42 PM UTC

SAI_Peregrinus wrote: post #101

Daneel_ wrote: post #81

Earlier quoted context omitted.

Where are the three phase models?? Seriously though, a 15A kettle sounds great.

Photonicinduction's 10-second kettle[1] managed about 10kW max (took around 5s to boil water) for a short time, 440V 23A. Then the resistance dropped, it went up to 16kW (426V 33A) and popped. 7-8kW (375V 19A to 400V 20A) seemed more sustainable. [1] https://www.youtube.com/watch?v=dDLw1Rx_cAI

2500W on 240V, single phase AC, 16A, German 'Schuko'-plug is normal. Or was. Some EU-regulation limits that to 2000, or even 1500W only now, for new devices, or something.

Don't care. Still have the old ones, and whatever the electrician wired as '120V 3-phase AC' for the full US-style range in the US.

Re: Record-breaking neutrino is most energetic ever detected

#136

Post by somat » Thu, Feb 13, 2025, 5:23 PM UTC

zozbot234 wrote: post #14

lnauta wrote: post #8

Earlier quoted context omitted.

One of the lead researchers in KM3NeT mentioned that the particle was emitting 2 horse power in light during detector transit. A typical body builder expends about 1 horse power while performing, so its 2 body builders in a single particle.

Fun fact, a typical horse exerts about 1 horse power of usable work while performing. That's so weird, I'm sure almost no one would've been able to guess that - but it's true. (To be clear, that's sustained effort over time, not just momentary. Athletically trained humans can do about 1 HP of peak momentary effort, and around 0.3 HP if sustained over time.)

The funny thing is that a typical horse probably has closer to 2 or 3 horsepower and a big chonkin draft horse up to 4 or 5 times.

James Watt just picked the smallest possible value of horse when defining the unit so he could sell more steam engines.

https://www.youtube.com/watch?v=7qxTKtlvaVE (donut, How Much Horsepower is a Horse?)

Re: Record-breaking neutrino is most energetic ever detected

#137

Post by queuebert » Mon, Feb 17, 2025, 5:53 PM UTC

PaulHoule wrote: post #106

queuebert wrote: post #88

Earlier quoted context omitted.

That is weird. Is the conventional explanation a flash from one of the last fusion stages right before core collapse?

The core collapse itself produces most of the neutrinos. All of these protons are squeezed together with electrons which produces neutrons and neutrinos.

I was referring to the earlier monoenergetic flash. Yes, most should be produced through electron capture in the collapse, but for earlier event to be monoenergetic suggests a specific nuclear process to me.