I have read many sources saying that to break up broodiness then remove them from the nest daily. I did this and they went right back to the nest each time. I also read about getting a bucket with ice water and put them down in it up to their breast bone with the idea of cooling it down and this should break up the broodiness but you have to do this several days in a row and I thought it sounded like too much trouble so I have not tried this but I did read somewhere that if you put them somewhere away from their nest for three days this would work. I was hoping that just isolating them for one day would work and so I tried that and it did not. On a separate occasion, I tried it for two days and it did not work. Wherever I read three days, they knew what they were talking about. I kept the 8 hens in another pen for three days and then released them. I was happy to see that they did not return to their nests except for one. I quickly went to the nests and removed all eggs so that she would not see any to sit on. Sure enough she looked into every nest and did not find any and it was about time to go to roost and so she did and the next day it appeared that she had indeed given up on nesting.
I am happy to say that three days is the charmer and no less and all 8 hens have been cured of their broodiness - at least for now.