Technology

Japanese Dark Matter Detector is Seeing a “Surprising Excess of Events”


But now and then a neutrino can collide with the nucleus of an atom, creating a few stray photons or elementary particles.


These collisions are so rare that neutrino observatories often involve sensitive detectors within large regions of fluid or ice.


Credit: SLAC National Accelerator LaboratoryThe XENON1T collaboration is one such dark matter experiment.


Buried deep underground, it involves a detector array filled with a tonne of purified liquid xenon.


If they exist, WIMPs would be much heavier than neutrinos, meaning they would produce a distinct signature when they collide with regular matter.


Axions were first proposed in 1977 to solve some subtle problems in particle physics, but their theoretical properties are similar to those of dark matter.






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