<prompt> UMeitner waqala ukusebenza no-Otto Hahn eminyakeni yokuqala futhi ndawonye naye wathola ama-isotopes amasha amaningana. Ngo-1909 wethula amaphepha amabili emisebe ye-beta. Wabuye, kanye no-Otto Hahn, wathola futhi wahlakulela indlela yokuhlukanisa ngokomzimba eyaziwa ngokuthi i-radioactive recoil, lapho i-nucleus yendodakazi ikhishwa ngamandla kusuka kumatrix yayo njengoba ibuyela emuva ngesikhathi sokubola. Umbuzo: Ngubani owamsiza wathola ama-isotopes amasha?  <response>: U-Otto Hahn 