"Verify" is a strong word. The RIKEN experiment didn't come close to the usual standard of evidence for declaring a new particle exists, it just showed a reacti

"Verify" is a strong word. The RIKEN experiment didn't come close to the usual standard of evidence for declaring a new particle exists, it just showed a reaction for which creation of a tetraneutron is a possible explanation. There need to be a lot more experiments (different ones, not just repeats of RIKEN's) before anybody would be willing to declare tetraneutrons "exist".