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Neutrino experiments

Discussion in 'Science & Technology' started by Drone, Nov 22, 2013.

  1. Drone

    Drone

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    [​IMG]


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    It's the highest energy neutrino ever observed, with an estimated energy of 1.14 PeV. These events constitute the first solid evidence for astrophysical neutrinos from cosmic accelerators.
     
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  2. Drone

    Drone

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    NOvA is the next generation neutrino experiment.

    I just love neutrinos - the most abundant, curious, and elusive critters in particle physics. This project looks so promising.



    Look at the size of this thing!

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    After completion this summer NOvA’s near and far detectors will weigh 300 and 14000 tons, respectively.
     
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  3. HammerON

    HammerON The Watchful Moderator Staff Member

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    Cool stuff:toast:
    Thanks for sharing.
     
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  4. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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    I wonder if there's a connection between neutrinos and cancer.
     
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  5. Steevo

    Steevo

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    Anything over a few MeV is capable of damaging DNA, however the real question is what are you going to do about it? Particles of this size can fly all the way through the earth and then finally interact with an atom in the ice, unless you ware willing to sit at the bottom of a very thick lead lined well for your life.......
     
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  6. McSteel

    McSteel

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    I'm not sure I'd call these telescopes, as their resolution, integration time and precision are all way below what's required to get a meaningful picture of anything in even a year, let alone a couple of days or weeks... They're very slow and imprecise detectors at best. That being said, it'll be interesting to find out how many high-energy mu- and tau-neutrinos can reach us. Also, I wonder if we will detect any right-chirality neutrinos, and if they will have a large Majorana mass if we do... Guess it's a waiting game now.

    There's a connection between anything capable of causing direct cellular damage at the structural level while leaving the cell capable of mitosis and cancer. Why not neutrinos as well? Granted, their interaction radius is of the order of 10^-44 m, so it must be an extremely rare occurrence, but possible nonetheless.
     
  7. Drone

    Drone

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    Ahahaha where on Earth did you get that number from? Even Planck length is longer
     
  8. BiggieShady

    BiggieShady

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    Yeah, more like 2 × 10 ^ −23 meters, the effective cross-section radius of 1 MeV neutrinos as measured by Clyde Cowan and Frederick Reines in 1950-ies

    Their result was presented as cross section area in squared cm, hence the exponent of -44
     
  9. McSteel

    McSteel

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    And I did mean square meters, but my brain decided to fart instead.
     
  10. Drone

    Drone

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    Exciting news!

    IceCube detected three astrophysical neutrinos that could have radiated from titanic explosions in the depths of space.

    Such interactions are so infrequent that IceCube researchers had to search for two years to find these three high-energy neutrinos.

    That's so cool!

    Source
     
  11. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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    Has anyone been able to figure out how fast they move yet? Detecting one is difficult, I imagine detecting the same one twice to get a velocity is near impossible.

    I heard recently that they're the only known object that can travel faster than the speed of light but Wikipedia tends to disagree:
    http://en.wikipedia.org/wiki/Measurements_of_neutrino_speed
     
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  12. Drone

    Drone

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    That's bullcrap. Speed of light (its average value anyway) is a cosmological limit (as a function of space and time). Only light itself can travel slightly faster than 299792458 m/s. Here's what Richard Feynman says about this:


    In a nutshell: light travels with variable speed and not in straight lines. It can go slower or faster than c but all those vectors cancel each other out and in the end you get average value which is conventional speed of light aka c.

    Even gravity itself can't travel faster than light. Neutrino has mass it means it's slower than light, it can get accelerated to 99. .... % of c though.
    However unlike light neutrino can't be affected by magnetic field, in that sense neutrino has more freedom than light.
     
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  13. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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    I didn't know that photons were variable and c is merely an average. You're post also invoked me doing a second Google search which pulled a second Wiki article:
    http://en.wikipedia.org/wiki/Faster-than-light_neutrino_anomaly

    The initial finding that may have indicated neutrinos moving faster than light was due to a loose fiber optic connection. :roll:
     
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  14. Drone

    Drone

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    Lol of course and also their gps was faulty or something like that. Only space-time and light can move faster than c because they are both "not of this world" if you see what I mean :roll:
     
  15. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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    What about qubits or quantum mechanics in general? I wouldn't write off the possibility...yet.
     
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  16. Drone

    Drone

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    Quantum mechanics and general relativity have theories about shortcuts like "wormholes", "entanglement" and "spooky action at a distance". They all have some interesting concepts where information can get from one point to another faster than possible. They don't violate principles they just make total route shorter, that's why exceeding the speed of light is not required.
     
  17. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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    Another one is electrons. When they change the shelf they are on, they emit photons. The rate at which they change shelves could exceed c too.
     
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  18. Drone

    Drone

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    It's uncertainty principle. Electron's position isn't exact but probable. At any given time electron around the atom's nucleus can appear at any time and any place in the Universe. It's called one-electron universe postulated by Richard Feynman:

    Links:

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    I can easily imagine this because all electrons in the Universe are absolutely identical
     
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  19. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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    That's crazy if true. There's billions of billions of billions of billions of electrons in everyone of us.
     
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  20. Drone

    Drone

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    Researchers established a range (0.3-0.9 eV) for the upper limit on the mass of the neutrino.


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    The main goal of the NEMO (Neutrino Ettore Majorana Observatory) experiment was to detect an extremely rare signal, double-beta decay, which is normally hidden by stray radiation and natural radioactivity. To protect it from this background radiation, the NEMO-3 detector was set up under around 2km of rock, in the Fréjus road tunnel, and built using materials with very low radioactivity. As a result, total radioactivity levels inside the dectector are 10 million times weaker than natural radioactivity.


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    Another characteristic that makes the NEMO instrument unique is its ability to identify the particles emitted in double-beta decay while at the same time using calorimeters to measure their energy. The quality of the data obtained thanks to these technologies opens the way for SuperNEMO, a detector that will be 100 times as sensitive and may be able to detect neutrinoless double-beta decay. With this future instrument, expected to be up and running in 2018, the scientists hope to usher in a new physics that goes beyond the Standard Model.
     
  21. Drone

    Drone

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    This is revolutionary stuff:

    Neutrinos forged in the heart of the sun have been detected for the first time

    Source

    The Borexino detector (haha, looks so unreal)

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    Last edited: Aug 28, 2014

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