Cosmic rays have surprising amounts of antimatter. Is dark matter responsible?

[billslugg]

If two particles have the same mass and speed, and collide from 180° different directions, their net momentum will be zero. If they anihillate and then emit a single photon, it will have a non-zero momentum. Momentum would not be conserved. Two photons allows conservation of momentum.

 

[chemicalmicroscopist]

Aren't each of those analysis techniques empirically calibrated to 100% of what is being measured? That would make them all come out to 100%. If there is something that you cannot detect, then it would not show up in the measurement or the calibration.

Something will not fit together. Electro-chemical analyses can be done using only Coulombs measured. Coulombs are defined by universal constants. Same with mass spectrometry (you can count the atoms). These techniques should come up short of 100%.
Something should be inconsistent with gravimetric results.
You are right about gravimetric analysis being calibrated to the measured gravimetric mass.

 

[jhixon]

Researchers have just found evidence of “dark electrons”—electrons you can’t see using spectroscopy—in solid materials.
By analyzing the electrons in palladium diselenide, the team was able to find states that functionally cancel each other out, blocking the electrons in those “dark states” from view.