scholarly journals Current Direct Neutrino Mass Experiments

2013 ◽  
Vol 2013 ◽  
pp. 1-39 ◽  
Author(s):  
G. Drexlin ◽  
V. Hannen ◽  
S. Mertens ◽  
C. Weinheimer
Keyword(s):  
Neutrino Mass ◽  
Mass Scale ◽  
Background Rate ◽  
A Value ◽  
Independent Information ◽  
Absolute Mass ◽  
The Status ◽  
Institute Of Technology ◽  
Under Construction ◽  
Katrin Experiment

In this contribution, we review the status and perspectives of direct neutrino mass experiments, which investigate the kinematics ofβ-decays of specific isotopes (3H,187Re,163Ho) to derive model-independent information on the averaged electron (anti)neutrino mass. After discussing the kinematics ofβ-decay and the determination of the neutrino mass, we give a brief overview of past neutrino mass measurements (SN1987a-ToF studies, Mainz and Troitsk experiments for3H, cryobolometers for187Re). We then describe the Karlsruhe Tritium Neutrino (KATRIN) experiment currently under construction at Karlsruhe Institute of Technology, which will use the MAC-E-Filter principle to push the sensitivity down to a value of 200 meV (90% C.L.). To do so, many technological challenges have to be solved related to source intensity and stability, as well as precision energy analysis and low background rate close to the kinematic endpoint of tritiumβ-decay at 18.6 keV. We then review new approaches such as the MARE, ECHO, and Project8 experiments, which offer the promise to perform an independent measurement of the neutrino mass in the sub-eV region. Altogether, the novel methods developed in direct neutrino mass experiments will provide vital information on the absolute mass scale of neutrinos.

scholarly journals TRIBIMAXIMAL MIXING IN NEUTRINO MASS MATRICES WITH TEXTURE ZEROS OR VANISHING MINORS

2011 ◽  
Vol 26 (07) ◽  
pp. 501-514 ◽  
Author(s):  
S. DEV ◽  
SHIVANI GUPTA ◽  
RADHA RAMAN GAUTAM
Keyword(s):  
Neutrino Mass ◽  
Mass Matrix ◽  
Mass Scale ◽  
Neutrino Mass Matrix ◽  
Seesaw Mechanism ◽  
Majorana Mass ◽  
Absolute Mass ◽  
Mass Matrices ◽  
The One ◽  
The Right

We study the existence of one/two texture zeros or one/two vanishing minors in the neutrino mass matrix with μτ symmetry. In the basis where the charged lepton mass matrix and the Dirac neutrino mass matrix are diagonal, the one/two zeros or one/two vanishing minors on the right-handed Majorana mass matrix having μτ symmetry will propagate via seesaw mechanism as one/two vanishing minors or one/two texture zeros in the neutrino mass matrix with μτ symmetry respectively. It is found that only five such texture structures of the neutrino mass matrix are phenomenologically viable. For tribimaximal mixing, these texture structures reduce the number of free parameters to one. Interesting predictions are obtained for the effective Majorana mass Mee, the absolute mass scale and the Majorana-type CP violating phases.

Absolute neutrino mass scale determination with the KATRIN experiment

2007 ◽  
Author(s):  
F. Glück ◽  
Osvaldo Civitarese ◽  
Ivan Stekl ◽  
Jouni Suhonen ◽  
Keyword(s):  
Neutrino Mass ◽  
Mass Scale ◽  
Absolute Neutrino Mass ◽  
Katrin Experiment

scholarly journals Status of the MAJORANA DEMONSTRATOR: A search for neutrinoless double-beta decay

2015 ◽  
Vol 30 (12) ◽  
pp. 1530032
Author(s):  
Yu. Efremenko ◽  
N. Abgrall ◽  
I. J. Arnquist ◽  
F. T. Avignone ◽  
C. X. Baldenegro-Barrera ◽  
...  
Keyword(s):  
Region Of Interest ◽  
Double Beta Decay ◽  
Q Value ◽  
Background Rate ◽  
Low Background ◽  
The Status ◽  
Scale Experiment ◽  
Under Construction ◽  
Sanford Underground Research Facility ◽  
The Universe

If neutrinos are Majorana particles, i.e. fermions that are their own antiparticles, then neutrinoless double-beta (0νββ) decay is possible. In such a process, two neutrons can simultaneously decay into two protons and two electrons without emitting neutrinos. Neutrinos being Majorana particles would explicitly violate lepton number conservation, and might play a role in the matter–antimatter asymmetry in the universe. The MAJORANA DEMONSTRATOR experiment is under construction at the Sanford Underground Research Facility in Lead, SD and will search for the neutrinoless double-beta (0νββ) decay of the 76Ge isotope. The goal of the experiment is to demonstrate that it is possible to achieve a sufficiently low background rate in the 4 keV region of interest (ROI) around the 2039 keV Q-value to justify building a tonne-scale experiment. In this paper, we discuss the physics and design of the MAJORANA DEMONSTRATOR, its approach to achieving ultra-low background and the status of the experiment.

scholarly journals A Quantum Sensor for Neutrino Mass Measurements

2012 ◽  
Vol 2012 ◽  
pp. 1-24 ◽  
Author(s):  
Juan Manuel Cornejo ◽  
Daniel Rodríguez
Keyword(s):  
Neutrino Mass ◽  
Electron Neutrino ◽  
Penning Traps ◽  
Novel Device ◽  
The Status ◽  
Systematic Effects ◽  
Important Input ◽  
The Difference ◽  
Under Construction ◽  
The University

There are few experiments aiming at determining directly the mass of the electron antineutrino with a sensitivity of 0.2 eV by analyzing the end of theβ-decay spectrum of specific nuclei. This sensitivity can be only reached if the uncertainties arising from systematic effects are very small and very well determined. The same holds for experiments aiming at improving the sensitivity in the determination of the mass of the electron neutrino using electron-capture (ϵ)-decaying nuclei. One important input in these cases is an accurateQ-value of the decay which can be unambiguously determined from the difference of the mass of the mother and the daughter nuclei by means of Penning traps. In order to reach the required sensitivity, a novel device calledQuantum Sensoris under construction at the University of Granada (Spain). The device will allow measuring atomic masses, and thereforeQ-values from decays with unprecedented accuracy and sensitivity, using fluorescence photons from a laser-cooled ion instead of electronic detection. This paper will give an overview onQ-value measurements performed with Penning traps, relevant for neutrino mass spectrometry, describing the Quantum Sensor and the facility under construction. It will end by presenting the status of the project.

scholarly journals Status and the perspectives of the Jiangmen Underground Neutrino Observatory (JUNO)

2020 ◽  
Vol 35 (09) ◽  
pp. 2030004
Author(s):  
Lino Miramonti
Keyword(s):  
Neutrino Mass ◽  
Liquid Scintillator ◽  
Solar Neutrinos ◽  
Mass Hierarchy ◽  
Atmospheric Neutrinos ◽  
Neutrino Mass Hierarchy ◽  
The Status ◽  
Order Of Magnitude ◽  
Under Construction

One of the remaining undetermined fundamental aspects in neutrino physics is the determination of the neutrino mass hierarchy, i.e. discriminating between the two possible orderings of the mass eigenvalues, known as Normal and Inverted Hierarchies. The Jiangmen Underground Neutrino Observatory (JUNO), a 20 kt Liquid Scintillator Detector currently under construction in the South of China, can determine the neutrino mass hierarchy and improve the precision of three oscillation parameters by one order of magnitude. Moreover, thanks to its large liquid scintillator mass, JUNO will also contribute to study neutrinos from non-reactor sources such as solar neutrinos, atmospheric neutrinos, geoneutrinos, supernova burst and diffuse supernova neutrinos. Furthermore, JUNO will also contribute to nucleon decay studies. In this work, I will describe the status and the perspectives of the JUNO experiment.

SO(10) FOR GRAND UNIFICATION?

1992 ◽  
Vol 07 (08) ◽  
pp. 641-651 ◽  
Author(s):  
S.F. TUAN
Keyword(s):  
Neutrino Mass ◽  
Solar Neutrino ◽  
Mass Scale ◽  
Grand Unification ◽  
Problem Model ◽  
Solar Neutrino Problem ◽  
The Status ◽  
Standard Picture ◽  
Invisible Axion ◽  
Physical Phenomena

In this brief review, we present the arguments both theoretical and experimental in favor of the simple group SO(10) as the first approximation towards grand unification. The physical phenomena of the solar neutrino problem which motivate existence of neutrino mass, the recent LEP data which rule out the simple SU(5) (and perhaps supersymmetric SU(5) if tied also to the solar neutrino problem) model for which vanishing neutrino masses would be logical, coupled with attractive features like accommodating the invisible axion and a τ neutrino mass acceptable to cosmology, converge towards a two-step SO(10) model with intermediate mass scale of order 1011 GeV . We comment on the status of a second Z′ in a model of the spontaneous breakdown of SO(10) which is particularly conservative in that very little of the standard picture is altered.

The Capacity of a Specific Anti-Streptococcus Mutans Monoclonal Antibodies Test to Identify the Diabetic Patients with Increased Risk of Periodontal Disease

2017 ◽  
Vol 68 (11) ◽  
pp. 2556-2559
Author(s):  
Mona Ionas ◽  
Sebastian Ioan Cernusca Mitariu ◽  
Adela Dancila ◽  
Tiberiu Horatiu Ionas ◽  
Raluca Monica Comaneanu ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Periodontal Disease ◽  
Streptococcus Mutans ◽  
Mutans Streptococci ◽  
Diabetic Patients ◽  
A Value ◽  
Salivary Level ◽  
Increased Risk ◽  
The Status

By means of a specific anti-Streptococcus mutans monoclonal antibodies test we want to identify the diabetic patients which have an increased risk to develop the periodontal disease. The highest percentage, of 88.1% of all patients included in this study represents the subjects with a level greater than 500,000 cfu / mL of streptococcus mutans. The Kruskal-Wallis test reveals a value of p = 0.283 resulted from the status of diabetes in patients and the level of streptococcus mutans in saliva. In conclusion, the status of diabetes in patients seems not to influence the salivary level of mutans streptococci determined with the method used in our study.

scholarly journals Relaxing cosmological neutrino mass bounds with unstable neutrinos

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Miguel Escudero ◽  
Jacobo Lopez-Pavon ◽  
Nuria Rius ◽  
Stefan Sandner
Keyword(s):  
Neutrino Mass ◽  
Particle Physics ◽  
Goldstone Boson ◽  
Mass Scale ◽  
Simple Extension ◽  
Type I ◽  
Mass Generation ◽  
Age Of The Universe ◽  
Neutrino Mass Models ◽  
The Right

Abstract At present, cosmological observations set the most stringent bound on the neutrino mass scale. Within the standard cosmological model (ΛCDM), the Planck collaboration reports ∑mv< 0.12 eV at 95 % CL. This bound, taken at face value, excludes many neutrino mass models. However, unstable neutrinos, with lifetimes shorter than the age of the universe τν ≲ tU, represent a particle physics avenue to relax this constraint. Motivated by this fact, we present a taxonomy of neutrino decay modes, categorizing them in terms of particle content and final decay products. Taking into account the relevant phenomenological bounds, our analysis shows that 2-body decaying neutrinos into BSM particles are a promising option to relax cosmological neutrino mass bounds. We then build a simple extension of the type I seesaw scenario by adding one sterile state ν4 and a Goldstone boson ϕ, in which νi→ ν4ϕ decays can loosen the neutrino mass bounds up to ∑mv ∼ 1 eV, without spoiling the light neutrino mass generation mechanism. Remarkably, this is possible for a large range of the right-handed neutrino masses, from the electroweak up to the GUT scale. We successfully implement this idea in the context of minimal neutrino mass models based on a U(1)μ−τ flavor symmetry, which are otherwise in tension with the current bound on ∑mv.

Toward constraining Saturn's rotation rate by interior modeling

2021 ◽  
Author(s):  
Nadine Nettelmann ◽  
Jonathan J. Fortney
Keyword(s):  
Broad Spectrum ◽  
Rotation Rate ◽  
Rotation Period ◽  
Outer Planet ◽  
Fall Meeting ◽  
Density Profiles ◽  
A Value ◽  
Periodic Signals ◽  
Under Construction ◽  
Even Harmonics

&lt;p&gt;The rotation rate of the outer planet Saturn is not well constrained by classical measurements of periodic signals [1]. Recent and diverse approaches using a broad spectrum of Cassini and other observational data related to shape, winds, and oscillations are converging toward a value about 6 to 7 minutes faster than the Voyager rotation period.&lt;br&gt;Here we present our method of using zonal wind data and the even harmonics&amp;#160;J&lt;sub&gt;2&lt;/sub&gt; to J&lt;sub&gt;10&lt;/sub&gt; measured during the Cassini Grand Finale tour [2] to infer the deep rotation rate of Saturn. We assume differential rotation on cylinders and generate adiabatic density profiles that match the low-order J&lt;sub&gt;2&lt;/sub&gt; and J&lt;sub&gt;4&lt;/sub&gt;&lt;br&gt;values. Theory of Figures to 7th order is applied to estimate the differences in the high-order moments J&lt;sub&gt;6 &lt;/sub&gt;to J&lt;sub&gt;10&lt;/sub&gt; that may result from the winds and the assumed reference rotation rate. Presented results are preliminary as the method is under construction [3].&lt;/p&gt;&lt;p&gt;[1] Fortney, Helled, Nettelmann et al, in: 'Saturn in the 21st century', Cambridge U Press (2018)&lt;br&gt;[2] Iess, Militzer, Kaspi, Science 364:2965 (2019)&lt;br&gt;[3] Nettelmann, AGU Fall Meeting, P066-0007 (2020)&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;

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