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 First results from the AMoRE-Pilot neutrinoless double beta decay experiment

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
V. Alenkov ◽  
H. W. Bae ◽  
J. Beyer ◽  
R. S. Boiko ◽  
K. Boonin ◽  
...  
Keyword(s):  
Beta Decay ◽  
Simultaneous Detection ◽  
Neutrinoless Double Beta Decay ◽  
Majorana Neutrino ◽  
Double Beta Decay ◽  
Cryogenic Detectors ◽  
Metallic Magnetic Calorimeter ◽  
Calcium Molybdate ◽  
First Results ◽  
Majorana Neutrino Mass

Abstract The advanced molybdenum-based rare process experiment (AMoRE) aims to search for neutrinoless double beta decay ($$0\nu \beta \beta $$0νββ) of $$^{100}$$100Mo with $$\sim 100\,\hbox {kg}$$∼100kg of $$^{100}$$100Mo-enriched molybdenum embedded in cryogenic detectors with a dual heat and light readout. At the current, pilot stage of the AMoRE project we employ six calcium molybdate crystals with a total mass of 1.9 kg, produced from $$^{48}$$48Ca-depleted calcium and $$^{100}$$100Mo-enriched molybdenum ($$^{48{{\text {depl}}}}\hbox {Ca}^{100}\hbox {MoO}_{4}$$48deplCa100MoO4). The simultaneous detection of heat (phonon) and scintillation (photon) signals is realized with high resolution metallic magnetic calorimeter sensors that operate at milli-Kelvin temperatures. This stage of the project is carried out in the Yangyang underground laboratory at a depth of 700 m. We report first results from the AMoRE-Pilot $$0\nu \beta \beta $$0νββ search with a 111 kg day live exposure of $$^{48{{\text {depl}}}}\hbox {Ca}^{100}\hbox {MoO}_{4}$$48deplCa100MoO4 crystals. No evidence for $$0\nu \beta \beta $$0νββ decay of $$^{100}$$100Mo is found, and a upper limit is set for the half-life of $$0\nu \beta \beta $$0νββ of $$^{100}$$100Mo of $$T^{0\nu }_{1/2} > 9.5\times 10^{22}~\hbox {years}$$T1/20ν>9.5×1022years at 90% C.L. This limit corresponds to an effective Majorana neutrino mass limit in the range $$\langle m_{\beta \beta }\rangle \le (1.2-2.1)\,\hbox {eV}$$⟨mββ⟩≤(1.2-2.1)eV.

Status of the AMoRE Experiment Searching for Neutrinoless Double Beta Decay Using Low-Temperature Detectors

2018 ◽  
Vol 193 (5-6) ◽  
pp. 1182-1189 ◽  
Author(s):  
H. S. Jo ◽  
S. Choi ◽  
F. A. Danevich ◽  
A. Fleischmann ◽  
J. A. Jeon ◽  
...  
Keyword(s):  
Low Temperature ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Low Temperature Detectors

A search for neutrinoless double beta decay of 130Te with a low temperature calorimeter

1992 ◽  
Author(s):  
A. Alessandrello ◽  
C. Brofferio ◽  
D. V. Camin ◽  
O. Cremonesi ◽  
G. Gervasio ◽  
...  
Keyword(s):  
Low Temperature ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay

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 Fabrication, characterization and analysis of a prototype high purity germanium detector for $$^{76}$$Ge-based neutrinoless double beta decay experiments

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
A. Jany ◽  
M. Misiaszek ◽  
T. Mroz ◽  
K. Panas ◽  
G. Zuzel ◽  
...  
Keyword(s):  
Beta Decay ◽  
Pulse Shape ◽  
Germanium Detector ◽  
Background Level ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Pulse Shape Discrimination ◽  
Discovery Potential ◽  
Excellent Energy Resolution ◽  
Prototype Detector

AbstractExperiments searching for the neutrinoless double beta decay in $$^{76}$$ 76 Ge are currently achieving the lowest background level and, in connection with the excellent energy resolution of germanium detectors, they exhibit the best discovery potential for the decay. Expansion to a ton scale of the active target mass is presently considered – in this case on-site production of the detectors may be an option. In this paper we describe the fabrication and characterization procedures of a prototype detector with a small p+ contact, which enhances the abilities of the pulse shape discrimination – one of the most important tools for background reduction. Simulations of the shapes of pulses from the detector were carried out and tuned, taking the advantage of the fact that all the parameters of the Ge crystal, cryostat and of the spectroscopic chain were known. As a result, the pulse shape analyses performed on the simulated and measured data agree very well. The worked out method allows to optimize geometry and crystal parameters in terms of pulse shape analysis efficiency, before the actual production of the detectors.

Sign in / Sign up

Export Citation Format

Share Document