Tauons are not stable particles, as such they are very difficult to find as they decay quite rapidly. To find them you would have to be (very!) close to the location of their creation, such as an supernova or a particle collider here on Earth (such as the one in CERN or the one at FermiLab).
situated
it is situated at Sarnath
The city was situated on the bay.
It is situated in London
it is situated at Sarnath
i do not know but it was situated in or with napolen on his march
Vietnam is situated in Southeast Asia.
France is not situated on a river.
It is situated at the abdomen
Where is Chitral Valley situated?
the RBI is situated in New Delhi
There are many places where many different things are situated. Many schools for example are situated in the center of cities.