Neutrino spectroscopy with atoms and molecules

Constraints on Neutrino Mass Ordering and Degeneracy from Planck and Neutrino-less Double Beta Decay

“…An experiment using atoms or molecules with an atomic process of radiative emission of neutrino pair (RENP) for neutrino spectroscopy might give a constraint on the absolute neutrino mass and/or mass ordering, or might independently determine them [9]. Fig.…”

Conditions for statistical determination of the neutrino mass spectrum in radiative emission of neutrino pairs in atoms

“…[22,23] and we have reproduced it (up to an overall factor 4). The basic process is the atomic transition |e → |g + γ + ν iνj assuming that it cannot proceed directly but only via an intermediate virtual state |p with E p > E e > E g .…”

“…This, in turn, opens up the possibility of precision neutrino mass spectroscopy, as proposed by Ref. [21][22][23].…”

“…Consequently once the six ω ij are measured, the spectrum of the neutrino masses could be fully identified. It has been argued that this method is ultimately capable of determining the neutrino mass scale, the mass ordering, the Dirac vs Majorana nature, as well as of measuring the Majorana CP violating phases [21][22][23].…”

Frequency dependence of coherently amplified two-photon emission from hydrogen molecules

“…For example, a superradiant laser using an optical clock transition has been proposed as a way to improve the stability of today's best clocks [5]. Coherent amplification can also be used to observe extremely rare deexcitation processes in atoms or molecules that emit neutrinos and a photon, by which the important parameters of neutrinos, such as their absolute masses, mass type, and CP -violating phases, can be determined [6].…”