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We propose neutrino mass spectroscopy using Er$^{3+}$:Cs$_2$NaYF$_6$ or:Y$_2$O$_3$ crystal placed in hollow of a Bragg fiber as a target system.Unknown neutrino parameters and properties such as the lightest neutrino mass,Majorana/Dirac distinction, and CP violating phases can be explored bymeasuring scattered photons ($\gamma$) along the excitation (and fiber) axis byvarying Raman trigger ($\gamma_0$) directions, in Er$^{3+}$ de-excitationprocess from $|e\rangle $ state to $|g\rangle $ state; $|e\rangle \,, |e\rangle + \gamma_0 \rightarrow | g\rangle + \gamma + \nu_i\bar{\nu}_j$,$\nu_i\,, i = 1, 2,3$ being a mass-resolved neutrino state. Rates and requiredlevel of QED background rejection are calculated using measured data of thetarget system.

Neutrino mass spectroscopy using Er$^{3+}$ ions placed at inversion center of host crystals