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    Hi everyone
    Can somebody please explain for me why particles (protons) have to be accelerated to very high energy in the accelerator before they collide with each others?
    :confused::confused::confused::confused:
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    Why do you think particles are collided at all?
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    Particles must be accelerated before colliding so that they can fuse, esp p-p fusion makes up a deutron, and a chain reaction can make a helium nucleus. If we don't accelerate them, the fusion process won't occur, as the K.E. wont be enough to make a new particle
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    Because the kinetic energy of the colliding particles is needed to break through the barrier of electrostatic repulsion forces which wants to stop other protons from joining the nucleus.

    High energy collision do one of two things:

    a) It can break the nucleus apart so that neutrons and protons go their separate (albeit conserved momentum high energy) ways as in a fission process. Commonly known as splitting the atom.

    b) It can fuse protons together to form new elements when the energy of the collision is great enough to overcome the electrostatic force repulsing other protons from the nucleus. This repulsion force must be overcome in order for the nuclear binding force to take over and glue the protons together. This is nuclear fusion.

    Think of the forces like this:

    You have a bunch of cricket balls which you are trying to throw into a large well where you store your other cricket balls. But there is a plate glass in the way. The window represents the electrostatic repulsion force of atoms and a cricket balls represents the proton and the nucleus of that atom. The well has a lot of cricket balls in it.

    So you throw cricket balls at the well, but they keep bouncing off the window. So you throw them harder and harder until eventually the window breaks and the ball finally gets sucked into the well.

    Hence the high energy collisions are needed to smash through the electrostatic repulsion force and then the nuclear binding force can take over and fuse the protons together.
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    (Original post by ryan.tran1509)
    Hi everyone
    Can somebody please explain for me why particles (protons) have to be accelerated to very high energy in the accelerator before they collide with each others?
    :confused::confused::confused::confused:
    In a particle accelerator, as opposed to a fusion reactor (which what others have given answers for), it's so that there is enough energy in the system to generate the very massive (i.e., with a large mass) particles.

    For example, the rest mass of a proton is ~938MeV. The rest mass of the Higgs Boson is ~125GeV. There is a huge energy difference between the two, so if you're colliding two protons together, you have an energy of 1.88GeV. That leaves 123GeV that needs to come from somewhere. It comes from the kinetic energy of the protons.
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    Thank you very much for your responds guys. I got it
 
 
 
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