http://www.popsci.com.au/science/energy/physicists-hope-to-catch-neutrons-in-the-act-of-jumping-from-our-universe-to-anotherQuote
They found that it's probably quite rare if it happens at all - according to their figures, the probability of a neutron making the leap to another universe is smaller than one in a million.
But that doesn't rule it out completely, especially considering how many neutrons there are out there. Moreover, Sarrazin thinks he has a way to observe this experimentally. A change in the gravitational potential should also affect the rate of matter swapping, and the gravitational potential here on Earth changes as the planet moves around the Sun. Run a neutron trapping experiment for a full year, and you could see if there is a modulation in the rate of neutron decay based on some kind of annual cycle. If so, that means the neutrons probably aren't just decaying, but swapping universes as well.
The general theory is to put some Neurons in a container, wait a year and see if there's still the same amount by that given time. The neurons in the container will be put in a "supercold" state and the physicists will be able to calculate the rate the Neurons decay. If there are some missing Neurons that shouldn't have decayed then there's a possibility of them travelling through different universes.
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