Search Results

This means that backlit protons are white, and as the observer changes angle to look at direct reflections, the protons become more and more red--and they are very red when illuminated head-on. …

Exclusive & semi-inclusive reactions are commonly as written target(beam, detected)undetected: $$p(\pi^-, \pi^+)n\pi^-$$ To understand the detection of the final state, we really need more information …

Note that the number of quarks and antiquarks at $Q^2$ is: $$ N_{q\bar q} = \int{\frac{dx} x F_2(x)} \approx \sum{\int{(q_i(x)+\bar q_i(x))dx}}$$ so the Gottfried Sum Rule is the difference in the n …

The Rutherford cross section is a non-relativistic limit, and is equivalent to a particle scattering from a static electric potential $V(r)$ without any consideration of the interaction of intrinsic m …

Regarding the polarizability of the nucleon--it's best to look at the neutron (since it's neutral). It has a magnetic dipole moment. Any electric dipole moment would violate time reversal and parity s …

I suppose the answer to this question is "No" because the quarks certainly don't travel in a spiral. The problem with answering "No" is that gives the impression that the question makes sense in the f …

The nuclear shell (per nucleon) model differs from the atomic shell model because of spin-orbit coupling and parity. Because the orbiting particles are identical, the even shells (starting from $0$) c …

I do not consider a proton to be an ionized hydrogen atom, since when I dealt with them, they were either a target being blasted by electrons/positrons (and it did not matter which), or they were in a …

So the detailed answers already given cover most of it, but I'll summarize: all protons are indistinguishable fermions, so if you have two unbound protons (labeled $b$ for beam and $t$ for target) elastically … In a nucleus, all neutrons and protons are in this entangled state where their isospin projection is mixed. …

In quantum mechanics, and energy eigenstate is a stationary state: that is, unchanging with time (other than a phase). This picture doesn't work with the idea of virtual particles popping in and out o …

Delta half lives are around $5 \times 10^{-24}$, which is 11+ orders of magnitude less than nanoseconds. They are so short that one generally discusses the width ($\Gamma$) of the resonance, given in …

The general rule for the size of a bound state is: $$ R = \frac{\lambda_C}{2\pi\alpha} $$ where $$\lambda_C = \frac{hc}{mc^2} = \frac{h}{mc}$$ is the Compton wavelength of the bound particle, and $\al …

This is where 4 vectors come in handy. With $p_{\mu}$ ($k_{\mu}$) representing the proton (electron) 4-momenta: $$p_{\mu} = \big(E_p, 0, 0, \sqrt{E_p^2-M_P^2}\big) \approx E_p\big(1, 0, 0, 1-\frac 1 2 …

What do protons offer that electrons and photons don't? … This makes it possible to use protons to image things built with high $Z$ material, materials like lead, tungsten, uranium, and plutonium. …

Starting with $uud$, or even $udd$, the probability to form a proton is 100%. This is because baryon number is conserved, and neutrons decay to proton. So if you make a neutron, it's going to be a pro …