Since there are such things as anti-electrons and anti-protons, is there such a thing as an anti-neutron?
Asked by: Howie Soucek
In a word: Yes. According to the standard model, every fundamental particle, has a corresponding
antiparticle. for example, the antiparticle of the electron is the positron (short for 'positive
electron'). However, protons and neutrons are not themselves fundamental particles; they are
composed of smaller particles called quarks. A proton contains two up quarks and one down quark
(uud), and a neutron contains one up and two down quarks (udd). the up quark has a charge of +2/3
and the down quark has a charge of -1/3. If you add up the charges in the proton and neutron, you
will find they are the observed values. Therefore the anti-proton has two anti-up quarks and one
anti-down quark (each of which having the same charge with opposite sign) giving it a total charge
of -1. The antineutron contains one anti-up quark and two ant-down quarks, giving it a charge of 0,
just like the regular neutron.
Answered by: Bill Zaientz, 12th Grade Student
'The strength and weakness of physicists is that we believe in what we can measure. And if we can't measure it, then we say it probably doesn't exist. And that closes us off to an enormous amount of phenomena that we may not be able to measure because they only happened once. For example, the Big Bang. ... That's one reason why they scoffed at higher dimensions for so many years. Now we realize that there's no alternative... '