<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: Ukudlula: Ngemva konyaka ehambele izinkulumo zikaPlanck, uMeitner waba umsizi kaPlanck. Phakathi neminyaka yokuqala wasebenza ndawonye nosokhemisi u-Otto Hahn futhi ndawonye naye wathola ama-isotope amaningana amasha. Ngo-1909 wethula amaphepha amabili mayelana nemisebe ye-beta. Futhi, kanye no-Otto Hahn, wathola futhi wasungula indlela yokuhlukanisa ngokomzimba eyaziwa ngokuthi i-radioactive recoil, lapho i-nucleus yendodakazi ikhishwa ngamandla emthonjeni wayo njengoba ibuya emuva ngesikhathi sokubola. Umbuzo: Ubani owamsiza ukuba athole ama-isotope amasha?  <response>: U-Otto Hahn 