●Stories
●Firehose
●All
●Popular
●Polls
●Software
●Thought Leadership
Submit
●
Login
●or
●
Sign up
●Topics:
●Devices
●Build
●Entertainment
●Technology
●Open Source
●Science
●YRO
●Follow us:
●RSS
●Facebook
●LinkedIn
●Twitter
●
Youtube
●
Mastodon
●Bluesky
Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!
Forgot your password?
Close
This discussion has been archived.
No new comments can be posted.
Load All Comments
Full
Abbreviated
Hidden
/Sea
Score:
5
4
3
2
1
0
-1
More
Login
Forgot your password?
Close
Close
Log In/Create an Account
●
All
●
Insightful
●
Informative
●
Interesting
●
Funny
The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
byAnonymous Coward writes:
What will it be in joules, 1 peta electronVolt?
Could I boil a kettle on this neutrino (potentially)?
byclick2005 ( 921437 ) * writes:
FTA:
Out of the countless detections it’s seen, two of them—nicknamed, seriously, Bert and Ernie—were phenomenally, unbelievably energetic: Each had an energy over one thousand trillion times the energy of a visible light photon. That’s huge, far larger energies than even the Large Hadron Collider can create. It’s very roughly equivalent to the energy of a raindrop hitting you on the head which may not sound like much, but remember we’re taking about a single subatomic par
bytrum4n ( 982031 ) writes:
But what is that in m/s?
byceoyoyo ( 59147 ) writes:
Lots. You'd have to know the neutrino mass to calculate it precisely.
byfemtobyte ( 710429 ) writes:
Actually, rounding to the nearest 10^-20 m/s, it would be 299,792,458 m/s.
We don't know what the mass of a neutrino is, but we do know they're light ( 10^15. Thus beta = v/c = sqrt(1-1/gamma^2) 1-0.5*10^-30: the neutrino is moving at a velocity within 1 part in 10^30 of the speed of light.
byfemtobyte ( 710429 ) writes:
D'oh, formatting ate my math symbols. Above should read:
We don't know what the mass of a neutrino is, but we do know they're light (m < 1 eV / c^2). Thus, a neutrino with total energy E = 10^15 eV has a Lorentz factor of gamma = E/m*c^2 > 10^15. Thus beta = v/c = sqrt(1-1/gamma^2) > 1-0.5*10^-30: the neutrino is moving at a velocity within 1 part in 10^30 of the speed of light.
byRoger W Moore ( 538166 ) writes:
We don't know what the mass of a neutrino is, but we do know they're light (m
Not quite - IceCube looks for muon neutrinos and these have a mass limit of 0.19 MeV/c^2 [lbl.gov]. The lowest mass constraint is actually 2 eV/c^2 for electron anti-neutrinos from tritium decay spectrum measurements.
Parent
twitter
facebook
byfemtobyte ( 710429 ) writes:
We've got poor direct limits on muon neutrino mass from muon neutrino experiments; however, there are other sources of much stronger constraints on neutrino masses. See the "summed mass" limits a few pages down in your reference.
From a Borexino neutrino experiment page at Princeton [princeton.edu]:
The current limits from cosmological considerations are less than about 0.5 eV (one millionth of the electron mass!) for the sum of the masses of all three neutrino types. The known values of the mass-squared differences imply that the heaviest neutrino type cannot be less massive than about 0.05 eV.
Parent
twitter
facebook
There may be more comments in this discussion. Without JavaScript enabled, you might want to turn on Classic Discussion System in your preferences instead.
Slashdot
●
●
Submit Story
Arithmetic is being able to count up to twenty without taking off your shoes.
-- Mickey Mouse
●FAQ
●Story Archive
●Hall of Fame
●Advertising
●Terms
●Privacy Statement
●About
●Feedback
●Mobile View
●Blog
Do Not Sell or Share My Personal Information
Copyright © 2026 Slashdot Media. All Rights Reserved.
×
Close
Working...
Working...