Re: [Phys-L] collisions

[Bernard Cleyet <bernardcleyet@redshift.com>]

As I wrote, A little knowledge is …”


On 2014, Jan 23, , at 16:28, John Denker <jsd@av8n.com> wrote:

> 3) Now let's ask about the black dot.  Let's go back to the 
> low temperature case, where quantum-mechanical interference 
> is observed.  Atoms the size of bacteria.
>
> Now ... use NMR to flip the nuclear spin of one of the atoms.
> This is your black dot.
>
> This changes everything.  The the two cases of scattering
> are now 100% distinguishable.  No more interference.  The
> scattering amplitude is different in this situation, even
> though the physical interaction is the same.  The physical
> interaction depends on the electron cloud and doesn't care
> what the nucleon is doing.



OTOH, how does one know in the scattering they don’t flip each other?

Does this relate to my question about the same photon?

bc