Topic: neutrinos have mass! ha ha standard model!
started by: CatKnight
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-- incubus
As I chase the leaves like the words I never find ...
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When my flying days are over, and my death has come to pass
I hope they bury me upside down, so the whole damn world can kiss my ass
the most interesting result of which is that string theory should unite general relativity and quantum gravity, allowing us to figure out mathematically what happens inside a blackhole or what happened in the first planck-second of the universe 
is that a British tern for 'Neutron'?
im confused...
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I may be paranoid, but not an Andriod.
Congradulations for the scientists, I'm sure someone will manage to get their head out of their ass yet!
I just watched somethign about this on the discovery channel (i was looking for some animals mating) and they said that there are not as many nutrinos as they had thought and that they have a mass aprox. 1/50,000 of an electron.
They showed the nutrino messuring set up. It is like 1.5 miles beneath an old nikel mine inside the worlds largest man-made cavity. BIg enough to hold a 10 story appartment building.
There are three flavours of neutrino: electron, muon and tau. Each of these derives from a process involving its name. ie an electron neutrino comes from processes involving electrons (eg beta decay) etc...
The Standard Model says that neutrinos should be massless, and to that end, physicists have measured upper limits for the neutrino mass.
So far, Earth based experiments looking for the neutrino ocsillation haven't seen anything.
Side note: Interestingly, the Isotope science lab at Curtin Uni has done some experiments looking at the mass of a neutrino. They were looking for discreapancies in the double beta decay of Molybdenum. They did n't show that they were massless, but the did give an upper limit. Just goes to show that you don't need bigg instruments to do cosmological experiments. 
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"Once you have pulled the pin from Mr. Grenade, he is no longer your friend."
-Unknown (cited in nene, 2001)
quote:
Originally posted by Rhydant:
ok, what the HELL is a neutrino?!?!?is that a British tern for 'Neutron'?
im confused...
hehe no. neutrino's are tiny uncharged particles originally theorized to exist in order to account for a slight energy loss, and to save conservation of energy. it turns out they are released in many different nuclear reactions, and that they are the most abundant particle in the universe. at any one second, a billion neutrinos or so are passing through your body. however, since they are so tiny and have very little mass and are uncharged, they hardly react with anything. a neutrino could pass through a wall of lead a light-year thick and not hit a single nucleus.
proton + electron = neutron + neutrino
so basically every single nucleon in the core of a supermassive star releases a neutrino. thats a fuck load of neutrinos! even though they don't interact with matter much at all, there are so many of them coming out of the core of the sun blasting into the inner layers of the star that all of the matter gets acclerated to relativistic speeds (.99999c etc).
This message has been edited by CatKnight on June 20, 2001 at 11:09 AM
Now for the big one.
When a star does the big crunch, at what point does it become a black hole?
and
if i follow all this right a black hole would just be a superdense nutron star?
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This message has been edited by CatKnight on June 21, 2001 at 09:33 AM