scholarly journals Signal identification with Kalman Filter towards background-free neutrinoless double beta decay searches in gaseous detectors

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Tao Li ◽  
Shaobo Wang ◽  
Yu Chen ◽  
Ke Han ◽  
Heng Lin ◽  
...  
Keyword(s):  
High Pressure ◽  
Kalman Filter ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Signal Identification ◽  
Simulation Data ◽  
Discrimination Power ◽  
Event Identification ◽  
Order Of Magnitude

Abstract Particle tracks and differential energy loss measured in high pressure gaseous detectors can be exploited for event identification in neutrinoless double beta decay (0νββ) searches. We develop a new method based on Kalman Filter in a Bayesian formalism (KFB) to reconstruct meandering tracks of MeV-scale electrons. With simulation data, we compare the signal and background discrimination power of the KFB method assuming different detector granularities and energy resolutions. Typical background from 232Th and 238U decay chains can be suppressed by another order of magnitude than that in published literatures, approaching the background-free regime. For the proposed PandaX-III experiment, the 0νββ search half-life sensitivity at the 90% confidence level would reach 2.7× 1026 yr with 5-year live time, a factor of 2.7 improvement over the initial design target.

scholarly journals Sensitivity of a tonne-scale NEXT detector for neutrinoless double-beta decay searches

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
◽  
C. Adams ◽  
V. Álvarez ◽  
L. Arazi ◽  
I. J. Arnquist ◽  
...  
Keyword(s):  
High Pressure ◽  
Beta Decay ◽  
Parameter Space ◽  
Half Life ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Neutrino Experiment ◽  
Order Of Magnitude ◽  
Better Than

Abstract The Neutrino Experiment with a Xenon TPC (NEXT) searches for the neutrinoless double-beta (0νββ) decay of 136Xe using high-pressure xenon gas TPCs with electroluminescent amplification. A scaled-up version of this technology with about 1 tonne of enriched xenon could reach in less than 5 years of operation a sensitivity to the half-life of 0νββ decay better than 1027 years, improving the current limits by at least one order of magnitude. This prediction is based on a well-understood background model dominated by radiogenic sources. The detector concept presented here represents a first step on a compelling path towards sensitivity to the parameter space defined by the inverted ordering of neutrino masses, and beyond.

scholarly journals Improved background rejection in neutrinoless double beta decay experiments using a magnetic field in a high pressure xenon TPC

2015 ◽  
Vol 10 (12) ◽  
pp. P12020-P12020 ◽  
Author(s):  
J. Renner ◽  
A. Cervera ◽  
J.A. Hernando ◽  
A. Imzaylov ◽  
F. Monrabal ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Pressure ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Background Rejection

scholarly journals Barium Chemosensors with Dry-Phase Fluorescence for Neutrinoless Double Beta Decay

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
P. Thapa ◽  
I. Arnquist ◽  
N. Byrnes ◽  
A. A. Denisenko ◽  
F. W. Foss ◽  
...  
Keyword(s):  
High Pressure ◽  
Beta Decay ◽  
Particle Physics ◽  
Neutrinoless Double Beta Decay ◽  
Large Mass ◽  
Double Beta Decay ◽  
Bulk Liquid ◽  
Gas Detectors ◽  
Open Questions ◽  
Experimental Challenge

Abstract The nature of the neutrino is one of the major open questions in experimental nuclear and particle physics. The most sensitive known method to establish the Majorana nature of the neutrino is detection of the ultra-rare process of neutrinoless double beta decay. However, identification of one or a handful of decay events within a large mass of candidate isotope, without obfuscation by backgrounds is a formidable experimental challenge. One hypothetical method for achieving ultra- low-background neutrinoless double beta decay sensitivity is the detection of single 136Ba ions produced in the decay of 136Xe (“barium tagging”). To implement such a method, a single-ion-sensitive barium detector must be developed and demonstrated in bulk liquid or dry gaseous xenon. This paper reports on the development of two families of dry-phase barium chemosensor molecules for use in high pressure xenon gas detectors, synthesized specifically for this purpose. One particularly promising candidate, an anthracene substituted aza-18-crown-6 ether, is shown to respond in the dry phase with almost no intrinsic background from the unchelated state, and to be amenable to barium sensing through fluorescence microscopy. This interdisciplinary advance, paired with earlier work demonstrating sensitivity to single barium ions in solution, opens a new path toward single ion detection in high pressure xenon gas.

scholarly journals Neutrino masses from low scale partial compositeness

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Zackaria Chacko ◽  
Patrick J. Fox ◽  
Roni Harnik ◽  
Zhen Liu
Keyword(s):  
Beta Decay ◽  
Form Factors ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Hidden Sector ◽  
Partial Compositeness ◽  
Order Of Magnitude ◽  
Partially Composite ◽  
Compositeness Scale

Abstract We consider a class of models in which the neutrinos acquire Majorana masses through mixing with singlet neutrinos that emerge as composite states of a strongly coupled hidden sector. In this framework, the light neutrinos are partially composite particles that obtain their masses through the inverse seesaw mechanism. We focus on the scenario in which the strong dynamics is approximately conformal in the ultraviolet, and the compositeness scale lies at or below the weak scale. The small parameters in the Lagrangian necessary to realize the observed neutrino masses can naturally arise as a consequence of the scaling dimensions of operators in the conformal field theory. We show that this class of models has interesting implications for a wide variety of experiments, including colliders and beam dumps, searches for lepton flavor violation and neutrinoless double beta decay, and cosmological observations. At colliders and beam dumps, this scenario can give rise to striking signals involving multiple displaced vertices. The exchange of hidden sector states can lead to observable rates for flavor violating processes such as μ → eγ and μ → e conversion. If the compositeness scale lies at or below a hundred MeV, the rate for neutrinoless double beta decay is suppressed by form factors and may be reduced by an order of magnitude or more. The late decays of relic singlet neutrinos can give rise to spectral distortions in the cosmic microwave background that are large enough to be observed in future experiments.

scholarly journals A CaMoO4Crystal Low Temperature Detector for the AMoRE Neutrinoless Double Beta Decay Search

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
G. B. Kim ◽  
S. Choi ◽  
F. A. Danevich ◽  
A. Fleischmann ◽  
C. S. Kang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Pulse Shape Discrimination ◽  
Metallic Magnetic Calorimeter ◽  
Discrimination Power ◽  
Low Temperature Detector ◽  
Temperature Detector ◽  
Search Experiment

We report the development of a CaMoO4crystal low temperature detector for the AMoRE neutrinoless double beta decay(0νββ)search experiment. The prototype detector cell was composed of a 216 g CaMoO4crystal and a metallic magnetic calorimeter. An overground measurement demonstrated FWHM resolution of 6–11 keV for full absorption gamma peaks. Pulse shape discrimination was clearly demonstrated in the phonon signals, and 7.6 σof discrimination power was found for theαandβ/γseparation. The phonon signals showed rise-times of about 1 ms. It is expected that the relatively fast rise-time will increase the rejection efficiency of two-neutrino double beta decay pile-up events which can be one of the major background sources in0νββsearches.

scholarly journals Status of the R2D2 project: A future neutrinoless double beta decay experiment

2021 ◽  
Vol 2105 (1) ◽  
pp. 012016
Author(s):  
Ioannis Katsioulas
Keyword(s):  
High Pressure ◽  
Beta Decay ◽  
Energy Resolution ◽  
Experimental Approach ◽  
Neutrinoless Double Beta Decay ◽  
Large Mass ◽  
Double Beta Decay ◽  
Majorana Particle ◽  
Excellent Energy Resolution ◽  
Double Beta Decay Experiment

Abstract The nature of the neutrino is a central questions in physics. The search for neutrinoless double beta decay is the most sensitive experimental approach to demonstrate that the neutrino is a Majorana particle. Observation of such a rare process demands a detector with an excellent energy resolution, extremely low background, and a large mass of a double beta decaying isotope. R2D2 aims to develop a novel spherical high-pressure TPC that meets all the above requirements. As a first step, the energy resolution of the R2D2 prototype was measured. A 1.1% (FWHM) energy resolution was achieved for 5.3 MeV α-particles in Ar:CH4 at pressure up to 1.1 bar. This is a major milestone for R2D2 and paves the way for further studies with Xe gas and the possible use of this technology for neutrinoless double beta decay searches.

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