scholarly journals Brief Review of the Results Regarding the Possible Underlying Mechanisms Driving the Neutrinoless Double Beta Decay

2021 ◽  
Vol 9 ◽  
Author(s):  
Andrei Neacsu ◽  
Vasile Alin Sevestrean ◽  
Sabin Stoica
Keyword(s):  
Beyond Standard Model ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Matrix Elements ◽  
Fundamental Symmetries ◽  
Fundamental Properties ◽  
Experimental Discovery ◽  
Underlying Mechanisms

Since the experimental discovery of neutrino oscillations, the search for the neutrinoless double beta (0νββ) decay has intensified greatly, as this particular decay mode, if experimentally discovered, could offer a testing ground for Beyond Standard Model (BSM) theories related to the yet hidden fundamental properties of neutrinos and the possibility of violating of some fundamental symmetries. In this work we make a brief review of the nuclear matrix elements and phase space factors calculations performed mainly by our group. Next, using these calculations and the most recent experimental half-life limits, we revise the constraints on the BSM parameters violating the lepton number corresponding to four mechanisms that could contribute to 0νββ decay. Finally, using the values obtained for the BSM parameters from one of the most sensitive double-beta decay experiments, we provide a comparison with the sensitivities of other experiments.

scholarly journals Constraints on Heavy Neutrino and SUSY Parameters Derived from the Study of Neutrinoless Double Beta Decay

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Andrei Neacsu ◽  
Sabin Stoica
Keyword(s):  
Phase Space ◽  
Shell Model ◽  
Beta Decay ◽  
Nuclear Matrix ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Heavy Neutrino ◽  
Matrix Elements ◽  
Lepton Number Violating

New constraints on the lepton number violating (LNV) parameters are derived from the analysis of the neutrinoless double beta (0νββ) decay in the hypothesis that this process would occur through the exchange of heavy neutrinos and/or SUSY particles. For derivation, we use new values of both phase space factors (PSFs) and nuclear matrix elements (NMEs) calculated with numerical codes developed recently, as well as the most recent experimental lifetimes. The NMEs are computed with a shell model (ShM) code for 48Ca, 76Ge, and 82Senuclei, while at present similar ShM results are available only for the first nucleus. We compare our results with similar ones from literature, obtained with ShM, QRPA, and IBM-2 methods, and conclude that more results are needed for a relevant analysis on the validity of NMEs associated with these decay mechanisms.

scholarly journals Status and Perspectives on Rare Decay Searches in Tellurium Isotopes

Universe ◽  
2021 ◽  
Vol 7 (7) ◽  
pp. 212
Author(s):  
Alice Campani ◽  
Valentina Dompè ◽  
Guido Fantini
Keyword(s):  
Beyond Standard Model ◽  
Neutrino Physics ◽  
Beta Decay ◽  
Rare Decay ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Data Sets ◽  
Astroparticle Physics ◽  
Exposure Data

Neutrinoless double beta decay (0νββ) is a posited lepton number violating decay whose search is an increasingly active field in modern astroparticle physics. A discovery would imply neutrinos are Majorana particles and inform neutrino physics, cosmology and beyond-standard-model theories. Among the few nuclei where double beta decay (ββ) is allowed, tellurium isotopes stand for their high natural abundance and are currently employed in multiple experiments. The search for 0νββ will provide large exposure data sets in the coming years, paving the way for unprecedented sensitivities. We review the latest rare decay searches in tellurium isotopes and compare past results with theories and prospects from running experiments.

A possible probe of neutrinoless double-beta decay nuclear matrix elements

2012 ◽  
Vol 9 (3) ◽  
pp. 220-227 ◽  
Author(s):  
S. M. Bilenky ◽  
F. Šimkovic
Keyword(s):  
Beta Decay ◽  
Nuclear Matrix ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Matrix Elements

scholarly journals Status and future of nuclear matrix elements for neutrinoless double-beta decay: a review

2017 ◽  
Vol 80 (4) ◽  
pp. 046301 ◽  
Author(s):  
Jonathan Engel ◽  
Javier Menéndez
Keyword(s):  
Beta Decay ◽  
Nuclear Matrix ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Matrix Elements

scholarly journals Variation of NMEs of 0νββ for 48Ca with different components of NN interaction

2019 ◽  
Vol 223 ◽  
pp. 01057
Author(s):  
Shahariar Sarkar ◽  
Pawan Kumar ◽  
Kanhaiya Jha ◽  
P.K. Raina
Keyword(s):  
Beta Decay ◽  
Nuclear Matrix ◽  
Model Space ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Central Component ◽  
Spin Orbit ◽  
Matrix Elements ◽  
Nucleon Interaction ◽  
Total Interaction

We examine the sensitivity of nuclear matrix elements (NMEs) for light-neutrino exchange mechanism of neutrinoless double beta decay (0νββ) for 48Ca to the various components of two-nucleon interaction, GXPF1A, in fp model space. It is found that the contribution in NMEs coming from the central component is close to contribution from total interaction. The spin-orbit and tensor components are found canceling the contribution of each other.

scholarly journals Comparison between variational Monte Carlo and shell model calculations of neutrinoless double beta decay matrix elements in light nuclei

2019 ◽  
Vol 798 ◽  
pp. 134974 ◽  
Author(s):  
X.B. Wang ◽  
A.C. Hayes ◽  
J. Carlson ◽  
G.X. Dong ◽  
E. Mereghetti ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Shell Model ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Light Nuclei ◽  
Matrix Elements ◽  
Model Calculations ◽  
Variational Monte Carlo

Neutrinoless double beta decay matrix elements beyond closure approximation

1990 ◽  
Vol 242 (1) ◽  
pp. 1-6 ◽  
Author(s):  
G. Pantis ◽  
J.D. Vergados
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Matrix Elements ◽  
Closure Approximation

scholarly journals Searching for Neutrinoless Double-Beta Decay of130Te with CUORE

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
D. R. Artusa ◽  
F. T. Avignone ◽  
O. Azzolini ◽  
M. Balata ◽  
T. I. Banks ◽  
...  
Keyword(s):  
Beta Decay ◽  
Energy Resolution ◽  
Confidence Level ◽  
Half Life ◽  
Average Energy ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Current Status ◽  
Upper Limit

Neutrinoless double-beta (0νββ) decay is a hypothesized lepton-number-violating process that offers the only known means of asserting the possible Majorana nature of neutrino mass. The Cryogenic Underground Observatory for Rare Events (CUORE) is an upcoming experiment designed to search for 0νββdecay of130Te using an array of 988 TeO2crystal bolometers operated at 10 mK. The detector will contain 206 kg of130Te and have an average energy resolution of 5 keV; the projected 0νββdecay half-life sensitivity after five years of livetime is 1.6 × 1026 y at 1σ(9.5 × 1025 y at the 90% confidence level), which corresponds to an upper limit on the effective Majorana mass in the range 40–100 meV (50–130 meV). In this paper, we review the experimental techniques used in CUORE as well as its current status and anticipated physics reach.

scholarly journals CONSTRAINTS OF MIXING ANGLES FROM LEPTON NUMBER VIOLATING PROCESSES

1999 ◽  
Vol 14 (06) ◽  
pp. 433-445 ◽  
Author(s):  
HIROYUKI NISHIURA ◽  
KOUICHI MATSUDA ◽  
TAKESHI FUKUYAMA
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Mixing Angles ◽  
Left Handed ◽  
Majorana Neutrinos ◽  
Mixing Matrix ◽  
Lepton Number Violating

We discuss the constraints of lepton mixing angles from lepton number violating processes such as neutrinoless double beta decay, μ--e+ conversion and K decay, K-→π+μ-μ- which are allowed only if neutrinos are Majorana particles. The rates of these processes are proportional to the averaged neutrino mass defined by [Formula: see text] in the absence of right-handed weak coupling. Here a, b(j) are flavor(mass) eigenstates and Uaj is the left-handed lepton mixing matrix. We give general conditions imposed on <mν>ab in terms of mi, lepton mixing angles and CP violating phases (three phases in Majorana neutrinos). These conditions are reduced to the constraints among mi, lepton mixing angles and <mν>ab which are irrelevant to the concrete values of CP phases. Given a <mν>ab experimentally, these conditions constrain mi and the lepton mixing angles. Though these constraints are still loose except for neutrinoless double beta decay, they will become helpful through rapid improvements of experiments. By using these constraints we also derive the limits on averaged neutrino masses for μ--e+ conversion and K decay, K-→π+μ-μ-, respectively. We also present the bounds for CP phases in terms of mi, mixing angles and <mν>ab.

scholarly journals EVIDENCE FOR NEUTRINOLESS DOUBLE BETA DECAY

2001 ◽  
Vol 16 (37) ◽  
pp. 2409-2420 ◽  
Author(s):  
H. V. KLAPDOR-KLEINGROTHAUS ◽  
A. DIETZ ◽  
H. L. HARNEY ◽  
I. V. KRIVOSHEINA
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Nuclear Matrix ◽  
Bayesian Method ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Matrix Elements ◽  
Majorana Particle ◽  
Best Value ◽  
Measuring Period

The data of the Heidelberg–Moscow double beta decay experiment for the measuring period August 1990–May 2000 (54.9813 kg y or 723.44 molyears), published recently, are analyzed using the potential of the Bayesian method for low counting rates. First evidence for neutrinoless double beta decay is observed giving first evidence for lepton number violation. The evidence for this decay mode is 97% (2.2σ) with the Bayesian method, and 99.8% c.l. (3.1σ) with the method recommended by the Particle Data Group. The half-life of the process is found with the Bayesian method to be [Formula: see text] (95% c.l.) with a best value of 1.5 × 1025 y . The deduced value of the effective neutrino mass is, with the nuclear matrix elements from Ref. 1, <m> = (0.11–0.56) eV (95% c.l.), with a best value of 0.39 eV. Uncertainties in the nuclear matrix elements may widen the range given for the effective neutrino mass by at most a factor 2. Our observation which at the same time means evidence that the neutrino is a Majorana particle, will be of fundamental importance for neutrino physics.

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