Read file till special char, copy that section into another file, and continue till eof

I am trying to read a file in Linux and as soon as a "&" character is encountered, I am writing the output to another file, sending that file to another folder and then continuing to read the original file till next "&" and so on Input xml file-

&




&

My code snippet -

while IFS= read -r line;do
     if [["$line" =="$delimeter"]];then
         echo "$line" | sed "s/delimeter.*//">> "$output_file"
         cp "$output_file" "$TARGET_FOLDER" 
         break
     else
         echo "$line" >> "$output_file"
     fi
done  to

(till &) section is put in output file, which is copied to TARGET_FOLDER. Then the next

to

section is copied and so on. Thankyou for your help!