I learnt that neutrons are unstable outside the nucleus,but how do they become stable in neutron stars?

or haw are neutron stars stable when neutrons are unstable outside the nucleus?????

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  • 1 decade ago
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    The "easy" way is to consider the neutron star like one gigantic atom which has (obviously) and overwhelming excess of neutrons.

    However, in nature, atoms with too large an excess in neutrons are not stable, they release the excess neutrons (which then find themselves outside an atom and become unstable...).

    The better way is to consider "neutron degeneracy".

    When a neutron breaks down, it becomes a proton and ejects an electron (plus a neutrino). In normal situations, there is lots of space for the electron to escape (and for the neutrino as well).

    However, in a neutron star, the neutrons are packed too close together (they can be considered "touching" each other, if ever the word "touching" makes sense for neutrons).

    There is no space for a electron to fit anywhere in between. Whenever (and wherever) the electron would escape, there is already a neutron there. With nowhere to go, the electron "stays inside" and the neutron behaves as if it were stable.

    This condition is called degeneracy.

    If we were able to scoop out a cup of the stuff and release it from the tremendous pressure (due to the star's gravity), then the neutrons would fly apart (despite the absence of electrical charge) and resume their normal unstable existence.

  • 1 decade ago

    A neutron star is in effect a giant nucleus. It is a collection of tightly bound neutrons, as tightly bound as they would be in an atomic nucleus. They are not at all the free neutrons which are unstable.

  • 4 years ago

    A neutron super call is a 2 to 3 image voltaic mass physique approximately 12 km in diameter. The sunlight will strengthen to a pink great then ultimately settlement and turn right into a chilly cinder if the universe lasts that long.

  • Anonymous
    1 decade ago

    A neutron star is in effect a giant nucleus. It is a collection of tightly bound neutrons, as tightly bound as they would be in an atomic nucleus. They are not at all the free neutrons which are unstable.

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  • Skecat
    Lv 5
    1 decade ago

    Neutrons have no charge.

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