Magnetic phase modulation of recoilless gamma radiation by nuclear Zeeman effect

Novel time-domain data on the nuclear Zeeman effect are presented from ${}_{}{}^{67}{}_{}{}^{}\mathrm{Zn}$ Mössbauer experiments. The results are in accordance with a theory developed for magnetic phase modulation. The self-calibrating feature of the high-frequency Zeeman scanning method allows precise determination of the 93-keV-state magnetic moment of the ${}_{}{}^{67}{}_{}{}^{}\mathrm{Zn}$ nucleus. For ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ in magnetically soft materials, the present approach predicts rf-field-induced sidebands without any mechanical motion, and an associated collapse phenomenon.