Mechanisms of neutrinoless double-beta decay: A comparative analysis of several nuclei

Ali, Ahmed; Borisov, A.; Zhuridov, Dmitry

doi:10.1134/s1063778810120136

Cited by 4 publications

(4 citation statements)

References 35 publications

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“…A number of authors 38,39,106,107,108,109 have tried to estimate the number of measurements required to discern the underlying physics. The assumption that is critical to these arguments is that the spread in M 0ν due to different models reflects the true variation, which is clearly speculative given the uncertainties still remaining in those calculations.…”

Section: The Number Of Required Experimental Resultsmentioning

confidence: 99%

Recent Progress in Double Beta Decay

Elliott

2012

Mod. Phys. Lett. A

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At least one neutrino has a mass of about 50 meV or larger. However, the absolute mass scale for the neutrino remains unknown. Studies of double beta decay offer hope for determining the absolute mass scale. Furthermore, the critical question: Is the neutrino its own antiparticle? is unanswered. In particular, zero-neutrino double beta decay (0νββ) can address the issues of lepton number conservation, the particle-antiparticle nature of the neutrino, and its mass. A summary of the recent progress in 0νββ, and the related technologies will be discussed in the context of the future 0νββ program.

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Section: The Number Of Required Experimental Resultsmentioning

confidence: 99%

Recent Progress in Double Beta Decay

Elliott

2012

Mod. Phys. Lett. A

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“…Extra-dimensional models with Kaluza-Klein neutrino states may also provide phenomenologically distinctive patterns [8]. Moreover, additional information from angular and energy electron distributions in the final state might help breaking degeneracies (see, e.g., [42]). The analysis of further (potentially more promising) mechanisms and observables, and of their relative discrimination in the presence of theoretical variants, is left to future works.…”

Section: Discussionmentioning

confidence: 99%

Multi-isotope degeneracy of neutrinoless double-βdecay mechanisms in the quasiparticle random-phase approximation

et al. 2011

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We calculate nuclear matrix elements (NME) of neutrinoless double beta decay (0νββ) in four different candidate nuclei ( 76 Ge, 82 Se, 100 Mo, 130 Te) within the quasiparticle random phase approximation (QRPA) and its uncertainties. We assume (up to) four coexisting mechanisms for 0ν2β decay, mediated by light Majorana neutrino exchange (ν), heavy Majorana neutrino exchange (N ), R-parity breaking supersymmetry ( / R), and squark-neutrino (q), interfering either constructively or destructively with each other. We find that, unfortunately, current NME uncertainties appear to prevent a robust determination of the relative contribution of each mechanism to the decay amplitude, even assuming accurate measurements of decay lifetimes. The near-degeneracy of 0νββ mechanisms is analyzed with simple algebraic techniques, which do not involve assumptions about the statistical distribution of errors. We discuss implications of such degeneracy on prospective searches for absolute neutrino masses.

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“…On the other hand, if we decide to go further and explore the underlying mechanisms of neutrinoless processes, we will have to extend our interest to transitions with the spin and parity other than 0 + , in other words, to transitions to nuclear excited states. Practical realization of the proposals to measure ratios of double-beta-decay transition rates of the excited states to those of the ground state of a given target, to be used for the extraction of the contribution of the various different mediating mechanisms [36][37][38][39][40], would face a severe problem with vanishingly small branching ratios for the population of excited states in double-beta decay.…”

Section: Neutrinoless Double-electron Capture Versus Neutrinoless Dou...mentioning

confidence: 99%

Search for resonant enhancement of neutrinoless double-electron capture by high-precision Penning-trap mass spectrometry

Eliseev

Novikov

Blaum

2012

J. Phys. G: Nucl. Part. Phys.

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The search for neutrinoless double-electron capture can be a good alternative to the neutrinoless double-beta-decay experiments in shedding light on such aspects of neutrino physics as the neutrino type, non-conservation of the total lepton charge and magnitude of the effective Majorana neutrino mass. The probability of neutrinoless double-electron capture can be resonantly enhanced by some orders of magnitude. Although the phenomenon of the resonant enhancement was predicted some decades ago, the search for resonantly enhanced neutrinoless double-electron-capture transitions was hampered by a lack of precise experimental values of the atomic mass differences of the transition initial and final states. Only recent progress in high-precision Penning-trap mass spectrometry has finally provided suitable means for a determination of atomic masses with a sufficient precision and thus given rise to the experimental campaign for a search for resonantly enhanced transitions. In this article, after an introduction to the theory of neutrinoless double-electron capture and the Penning-trap technique, a review is given on the results of systematic very precise direct Penning-trap measurements of the atomic mass differences of the nuclides which can undergo double-electron capture. The mass differences of 14 nuclear pairs have already been determined with a typical uncertainty of tens to a few hundreds of eV. Partial or even full resonant enhancement of the neutrinoless double-electron-capture probability has been discovered for 152Gd and 156Dy. In 156Dy a multiple resonance phenomenon has been revealed. For some transitions the half-lives have been estimated (152Gd, 164Er, 180W, 156Dy).

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Mechanisms of neutrinoless double-beta decay: A comparative analysis of several nuclei

Cited by 4 publications

References 35 publications

Recent Progress in Double Beta Decay

Recent Progress in Double Beta Decay

Multi-isotope degeneracy of neutrinoless double-βdecay mechanisms in the quasiparticle random-phase approximation

Search for resonant enhancement of neutrinoless double-electron capture by high-precision Penning-trap mass spectrometry

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