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Natural Science Forum / Physics / Particle Physics / March 2008Question about Neutrons
I was watching an astronomy tv show over the weekend, talking about when the mass of a star is large enough, when it "dies", the electrons will combine with the protons of the atoms, creating nothing but a dense pack of neutrons. The resulting "rebound" off this neutron core creates a super nova, and that there are neutrinos (sorry for botching the spelling so bad) that "push" material away from the star. I know that sub-atomic particles like protons and electrons are made up of three quarks each, as is a neutron. I no longer have my old college physics book, so I cannot look it up myself, and I have so far been unable to find a web reference to answer my question. That question is, when the three quarks of the electron and the three quarks of the proton combine, creating a neutron... What sub-atomic particle do the three "left over" quarks create? Is it a neutrino? Have they actually been discovered? Last time I knew, they were theorized, but never actually "seen". Or am I just totally wrong? : I was watching an astronomy tv show over the weekend, talking about when : the mass of a star is large enough, when it "dies", the electrons will [quoted text clipped - 13 lines] : they actually been discovered? Last time I knew, they were theorized, but : never actually "seen". Or am I just totally wrong? http://en.wikipedia.org/wiki/Neutrino Speaking of neutrinos..... I know they interact weakly with ordinary matter.... But every once in a while one does interact. A couple months ago one "interacted" with one of my nuts.....oh dang that hurt ! I yelled out "Neutrino sum bitch !" and shook my fist toward the Sun Oh sure they have almost no mass......but traveling at almost light speed....yeah, it'll get your attention. I now wrap my bag with aluminum foil because I'm pretty sure it'll block neutrinos and other signals. : Speaking of neutrinos..... : [quoted text clipped - 13 lines] : block neutrinos : and other signals. You'll need a lump of lead two light-years thick to block a neutrino. Maybe your balls are special. > : Speaking of neutrinos..... > : [quoted text clipped - 17 lines] > > Maybe your balls are special. one neutrino, half of the time > I know that sub-atomic particles like protons and electrons are made > up of three quarks each, as is a neutron. I no longer have my old > college physics book, so I cannot look it up myself, and I have so far > been unable to find a web reference to answer my question. Protons and neutrons are composed of quarks, but not electrons; electrons don't have any internal structure that we've observed. So there's only three quarks in the initial and final states. > That question is, when the three quarks of the electron and the three > quarks of the proton combine, creating a neutron... What sub-atomic > particle do the three "left over" quarks create? Is it a neutrino? http://en.wikipedia.org/wiki/W_and_Z_bosons has a neutron decay diagram; electron capture by a proton is the same process turned sideways. The proton and electron exchange a W boson, turning the electron into a neutrino and one of the u quarks in the proton into a d quark, which changes the proton into a neutron. > Have they actually been discovered? Last time I knew, they were > theorized, but never actually "seen". Neutrinos have been "seen". Since neutrinos interact very weakly with normal matter, it takes a lot of mass to observe neutrino interactions. One of my favorite neutrino observatories used photomultiplier tubes embedded in the Antarctic ice cap: http://www.amanda.uci.edu/public_info.html Also see the follow-on experiment, http://www.icecube.wisc.edu/info/ And for a list of recent neutrino detectors: http://en.wikipedia.org/wiki/Neutrino_detector -dan > > I know that sub-atomic particles like protons and electrons are made > > up of three quarks each, as is a neutron. I no longer have my old [quoted text clipped - 35 lines] > > -dan ------------- wrong! protons and Neutrons are not compsed only of '3 quarks" th emass of 3 quarks is less than 10 percent of the P N mass the rest 90 percent of missing mass is the 90 percent sameless ignorance of existing scince people have to impertinace to say that the rest 90 percent missing is ... 'glueons' that no one really knowes to fill that abstart say by any substancial reality or verification just shamelsss mumble jumble now listen carefully what old Catto tells you the missing 90 percent ---is massive subparticles (there is just one kind of mass !! no relativistic and no schmelativistic!) -- --that are STILL UNKNOWN!! so the differnce between real knowledge and pretended knowledge (and impertinance ) is as far from our galaxy to the neighbouring galaxy !! and the sonner serious scientists will realize it-- the better ATB Y.Porat ---------------------- > wrong! > [quoted text clipped - 10 lines] > by any substancial reality or verification > just shamelsss mumble jumble Not quite gluòns, but gluonic compounds which are the same as heavy quarks and neutral leptonic compounds: http://google.com/groups?q=Autymn+Porat+leptòns. > now listen carefully what old Catto tells you > > the missing 90 percent ---is massive subparticles > (there is just one kind of mass !! > no relativistic and no schmelativistic!) -- yes, one variant mass |
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