Hello, I am interested if anyone ever studied if a particle's halflife under different conditions. Usually you can see how long a particle lasts by measuring how long it moves at a relativistic speed. Has anyone ever tried to experiment and see if having the particle move at a relativistic speed would affect its halflife? For example, the neutron is noted to have a halflife of 611.0 ± 1.0 s. I gather this was calculated by measuring the free neutron's distance traveled at a relativistic speed. I do understand that it is very difficult to slow down a free neutron from a reaction, but has anyone ever tried to measure free neutron's halflife at a non-relativistic speed?