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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all. During recent discussions I came up with a theory which was written down a month or so ago.
the theory is that under certain conditions positrons (the antiparticles of electrons) could under certain conditions form Cooper pairs and therefore their interaction with normal matter would change.
an experiment to test this would be to form thin channels within a superconducting Type 2 material such as BSCCO or one of the more exotic Sn-In-CuO compounds and flood these with FDG (fluorodeoxyglucose) suspended in an inert carrier liquid (a positron emitting isotope) According to my theory at or below the Tc the positrons should form Cooper pair analogs and therefore their interaction with normal matter should change.
this should occur because in a superconductor the Cooper pairs flow without resistance which implies a lack of interaction with the material and therefore no resistance, so positron pairs should behave in the same or a very similar way.
The effect of this should be a detectable drop in gamma emission at the critical temperature (Tc) of the specific ceramic used, with the emission recovering to normal minus the expected radioactive decay loss once the temperature rises above Tc.
This is quite feasible to detect using off the shelf equipment but the specialised radioactive material needed (FDG) would be outside the scope of the home experimenter.
Update:- actually K-40 if a way could be found to separate it from natural potassium would serve as a positron source...
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
This reminds me of another thread I read recently on another site:
Not sure if it is relevant, as I certainly don't claim to know about these things.
What puzzles me is that anti-matter is supposed to travel backwards in time and matter travels forwards in time. If this is the case, how can either of these theories be justified?
(I'm just asking questions, I don't have any answers.)
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
I think where you are going wrong is "Cooper pairs flow without resistance which implies a lack of interaction with the material". The textbook version is that they do in fact interact, but the phonons (basically sound waves) created by collisions of one electron with the lattice are absorbed by the second electron in the pair, so there is no net energy dissipation. If rather than creating vibrations in the lattice, the whole positron is annihilated, I don't think there is a mechanism the debris of the reaction could be captured by the second positron.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
hmm, ok..
one wonders if this experiment would be a way to gain knowledge of the superconducting mechanism itself, by determining which of n mechanisms is most likely.
finding a useable positron emitting isotope to test would be the main problem here, (detectable effect here) according to this page the effect is caused by the positron and electron wave functions overlapping.
however if the effect of dropping gamma emission with Tc holds with several isotopes then this could be very interesting indeed. -A
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Antiparticle Cooper pairs?
