Proton and neutron

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  • #1
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Main Question or Discussion Point

isn't a neutron more massive thatn a proton?
 

Answers and Replies

  • #2
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It is. Free neutrons are even unstable and decay with a lifetime of something like 12min. To my big surprise, when I looked it up, the mass-difference was much more than I expected: 2.5 times the mass of an electron (I expected not much more than the electron mass).
 
  • #3
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The neutron is about 0.2% more massive than a proton, which translates to an energy difference of 1.29 MeV. I believe that the added mass of the electron plus the proton equals very close to the mass of the neutron.
 
  • #4
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Atheist said:
It is. Free neutrons are even unstable and decay with a lifetime of something like 12min. To my big surprise, when I looked it up, the mass-difference was much more than I expected: 2.5 times the mass of an electron (I expected not much more than the electron mass).
This is impossible, the mass of the proton is 1.67262158 × 10-27 kilograms, while the mass of the electron is 9.10938188 × 10-31 kilograms. This means that the proton has a mass more than 10^4 times that of the electron.
 
  • #5
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How come when a proton turns into a neutron (as in nuclear fusion in the Sun) it gives out energy AND gains in mass, where does all the extra energy come from
 
  • #6
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Masses given for particles are the masses of free particles. When particles bond together the created particle can have a lower mass than the sum of the constituents (to some extend one can even see this as the reason why stable bound states exist). The mass-difference is called the bonding energy.

@ArmoSkater: You seem to have mistaken my 1st post.
 
  • #8
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ArmoSkater87 said:
This is impossible, the mass of the proton is 1.67262158 × 10-27 kilograms, while the mass of the electron is 9.10938188 × 10-31 kilograms. This means that the proton has a mass more than 10^4 times that of the electron.
I think he means that he thought the difference in mass between a neutron and a proton would be close to the mass of an electron.
 
  • #9
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What, the *** are you guys talking about ???

regards
marlon
 
  • #10
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They are trying to make us swallow that a neutron = a proton + an electron :tongue2:
 
  • #11
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Based upon what evidence ???

What is the underlying theory here ...

regards
marlon
 
  • #12
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That would simply be wrong.
 

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