sicne neutrons are stable in a neucleous, is it possible that there is any atom-like structure that is stable that contains at least one 'abnormal' particle, li

sicne neutrons are stable in a neucleous, is it possible that there is any atom-like structure that is stable that contains at least one 'abnormal' particle, like a bozon, or any 'large' particle made of quarks that is not a proton or neutron?