Solitons and Precision Neutrino Mass Spectroscopy

Physics Letters B (Impact Factor: 6.02). 01/2011; 699(1). DOI: 10.1016/j.physletb.2011.03.058
Source: arXiv

ABSTRACT We propose how to implement precision neutrino mass spectroscopy using
radiative neutrino pair emission (RNPE) from a macro-coherent decay of a new
form of target state, a large number of activated atoms interacting with static
condensate field. This method makes it possible to measure still undetermined
parameters of the neutrino mass matrix, two CP violating Majorana phases, the
unknown mixing angle and the smallest neutrino mass which could be of order a
few meV, determining at the same time the Majorana or Dirac nature of masses.
The twin process of paired superradiance (PSR) is also discussed.

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    Physical Review A 03/2012; 86(1). DOI:10.1103/PhysRevA.86.013812 · 2.99 Impact Factor
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    ABSTRACT: We give a comprehensive account of our proposed experimental method of using atoms or molecules in order to measure parameters of neutrinos still undetermined; the absolute mass scale, the mass hierarchy pattern (normal or inverted), the neutrino mass type (Majorana or Dirac), and the CP violating phases including Majorana phases. There are advantages of atomic targets, due to the closeness of available atomic energies to anticipated neutrino masses, over nuclear target experiments. Disadvantage of using atomic targets, the smallness of rates, is overcome by the macro-coherent amplification mechanism. The atomic or molecular process we use is a cooperative deexcitation of a collective body of atoms in a metastable level |e> emitting a neutrino pair and a photon; |e> -> |g> + gamma + nu_i nu_j where nu_i's are neutrino mass eigenstates. The macro-coherence is developed by trigger laser irradiation. We discuss aspects of the macro-coherence development by setting up the master equation for the target quantum state and propagating electric field. With a choice of heavy target atom or molecule such as Xe or I_2 that has a large M1 x E1 matrix element between |e> and |g>, we show that one can determine three neutrino masses along with the mass hierarchy pattern by measuring the photon spectral shape. If one uses a target of available energy of a fraction of 1 eV, Majorana CP phases may be determined. Our master equation, when applied to E1 x E1 transition such as pH_2 vibrational transition Xv=1 -> 0, can describe explosive PSR events in which most of the energy stored in |e> is released within a few nanoseconds. The present paper is intended to be self-contained explaining some details related theoretical works in the past, and further reports new simulations and our ongoing experimental efforts of the project to realize the neutrino mass spectroscopy using atoms/molecules.
    11/2012; 2012(1). DOI:10.1093/ptep/pts066
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    ABSTRACT: In this paper, two atomic processes, neutrino-less double electron capture (0νϵϵ0νϵϵ) and radiative emission of neutrino pair (RENP), are described. The 0νϵϵ0νϵϵ process has the same physics objective as the neutrino-less double beta-decay, and thus its observation proves non-conservation of the total lepton number and the rate measurement would provide information on the effective neutrino mass. The RENP process is sensitive to the neutrino absolute mass scale, the mass hierarchy pattern, the mass type (Majorana or Dirac), and the CP violating phases. Its key idea is to amplify otherwise small rates of |e〉→|g〉+γ+νiνj|e〉→|g〉+γ+νiνj (with νi,νjνi,νj mass eigenstates), by developing the macro-coherent medium polarization among target atoms strongly coupled to fields inside the medium. Experiments using these two processes are now being planned to reveal nature of neutrinos.
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