Are there nuclei of only neutrons?

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SUMMARY

Neutron-only nuclei, such as dineutrons and tetraneutrons, do not exist as stable particles. The dineutron is confirmed to be unbound, while extensive searches for a bound tetraneutron have yielded negative results. The only stable configuration of neutrons is found in neutron stars, which represent a dense collection of neutrons under extreme gravitational conditions. This indicates that while isolated neutrons can exist, they do not form stable nuclei analogous to those composed of protons and neutrons.

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haael
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My question: do there exist particles similar to atomic nuclei, but made only of neutrons? If not, then why?

I suspect that this would be beta-unstable, but it should live for some time and get observed somehow.
 
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The dineutron is unbound. There was thought that the tetraneutron might be bound but all searches have come up negative.
 
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The closest thing to a stable "nucleus" made up of neutrons is a neutron star.
 
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