What kind of particle physics experiments are possible without particle accelerators? As far as i know particle accelerators are the main tools in particle physics for investigating fundamental physics.
Is it possible to perform tabletop experiments, like in low energy physics lab, without using colliders for finding new physics beyond the Standard Model?
I heard that some precise measurements can do what I am asking, but how and is it reliable?
Edit: i mean experiments on lab, where there is in principle the control of the source, that doesn't involve astroparticles. I prefer to leave this in another question.
 A: There are certainly other type of experiments to detect particles. Take for example:
https://iopscience.iop.org/article/10.1088/1475-7516/2011/06/035/meta
Where dark matter signatures are searched using gamma-ray emission.
Particle detection experiments can be classified as "direct" or "indirect". In the direct experiments (such as particle collision) you're looking to see/produce the particle, whereas in indirect experiments you're looking for a clue that a particle has done something.  The thing is that, direct experiments are easier to interpret, so if possible, you want to perform these.
As for finding new particles, it depends on the particle's mass. If they have high masses (such as Higgs boson), you need high energy experiments, such as collisions. If they have low mass, you really want to do other things. Take for example neutrinos, and Kamiokande or IceCube experiments.
A: With any cathode ray tube you are working with a beam of electrons (some with positive ions).  My college physics lab had one which operated at a very low voltage to measure, e/m, for electrons. If you have a radioactive source, a cloud chamber lets you see the tracks of individual particles.
