Fluorescent bicolour sensor for low-background neutrinoless double β decay experiments

Rivilla, Iván; Aparicio, B.; Bueno, Juan M.; Casanova, David; Tonnelé, Claire; Freixa, Zoraida; Herrero, Pablo; Rogero, Celia; Miranda, José I.; Martínez-Ojeda, Rosa M.; Monrabal, F.; Olave, Beñat; Schäfer, Thomas; Artal, Pablo; Nygren, D. R.; Cossío, Fernando P.; Gómez-Cadenas, J.J.

doi:10.1038/s41586-020-2431-5

Cited by 43 publications

(55 citation statements)

References 44 publications

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“…This coordination pattern in which the barium cation, aside the cation-π interaction, complexes the five oxygen atoms of the aza-crown ether and one nitrogen atom of fluorophore 2, was elucidated by DFT calculations and NMR experiments. 121 As expected, the FBI•Ba 2+ complex shows a noticeable blue shift (Figure 25C), with a peak discrimination factor fλ=179.74 and a brightness value of Bλ=8.06 M -1 cm -1 . The fluorescence spectra in solution and in the gas phase show intense emission signals for FBI and FBI•Ba 2+ (Figure 25D) compatible with the FMO scheme shown in Figure 25.…”

Section: Two-component Fluorescent Bicolour Indicatorssupporting

confidence: 79%

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Bicolour fluorescent molecular sensors for cations: design and experimental validation

Freixa

Rivilla

Monrabal

et al. 2021

Phys. Chem. Chem. Phys.

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Section: Two-component Fluorescent Bicolour Indicatorssupporting

confidence: 79%

“…As we have commented above, one possibility consists of developing monocolour ICT turn-on sensors. 23,24 Our approach 121 was based on the above-mentioned two-component design. Benzo[ a ]imidazo[5,1,2- cd ]indolizine was chosen as a suitable fluorophore of type C3 ( Fig.…”

Section: Design and Validation Of Bicolour Probesmentioning

confidence: 99%

Bicolour fluorescent molecular sensors for cations: design and experimental validation

Freixa

Rivilla

Monrabal

et al. 2021

Phys. Chem. Chem. Phys.

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“…This will pave the way to a tonne-scale experiment which will be sensitive to half-lives longer than 10 27 yr [27]. Importantly, the NEXT Collaboration pursues in parallel an extensive R&D program to develop the capability of detecting the 136 Ba daughter resulting from 136 Xe double beta decays inside a running TPC using single molecule fluorescence imaging [28][29][30][31][32]. If successful, these efforts could boost the sensitivity of HPXe EL-TPCs to half-lives on the scale of 10 28 yr.…”

Section: Jhep07(2021)146mentioning

confidence: 99%

Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

Simón¹,

Ifergan²,

Redwine³

et al. 2021

J. High Energ. Phys.

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Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ∼ 1027 yr, requiring suppressing backgrounds to < 1 count/tonne/yr. For this, any extra background rejection handle, beyond excellent energy resolution and the use of extremely radiopure materials, is of utmost importance. The NEXT experiment exploits differences in the spatial ionization patterns of double beta decay and single-electron events to discriminate signal from background. While the former display two Bragg peak dense ionization regions at the opposite ends of the track, the latter typically have only one such feature. Thus, comparing the energies at the track extremes provides an additional rejection tool. The unique combination of the topology-based background discrimination and excellent energy resolution (1% FWHM at the Q-value of the decay) is the distinguishing feature of NEXT. Previous studies demonstrated a topological background rejection factor of ∼ 5 when reconstructing electron-positron pairs in the 208Tl 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterráneo de Canfranc, with 72% signal efficiency. This was recently improved through the use of a deep convolutional neural network to yield a background rejection factor of ∼ 10 with 65% signal efficiency. Here, we present a new reconstruction method, based on the Richardson-Lucy deconvolution algorithm, which allows reversing the blurring induced by electron diffusion and electroluminescence light production in the NEXT TPC. The new method yields highly refined 3D images of reconstructed events, and, as a result, significantly improves the topological background discrimination. When applied to real-data 1.6 MeV e−e+ pairs, it leads to a background rejection factor of 27 at 57% signal efficiency.

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“…NEXT-100 (with 100 kg of xenon at 15 bar) is the next stage of the program [163], built with radiopure specifications [164] as a scale up of NEXT-White by 2:1 in size; operation might start in 2021. In the longer term, for a ton-scale detector exploring neutrinoless DBD half-lives beyond 10 27 y, NEXT-HD follows the same technology while NEXT-BOLD proposes the implementation of the detection of Ba ions which is under investigation [165,166]. NEXT, as CUPID and LEGEND, is recognized by the Double Beta Decay APPEC Committee as a competitive project [14].…”

Section: Xenon Dbd Experimentsmentioning

confidence: 99%

Cosmogenic Activation in Double Beta Decay Experiments

Cebrián

2020

Universe

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Double beta decay is a very rare nuclear process and, therefore, experiments intended to detect it must be operated deep underground and in ultra-low background conditions. Long-lived radioisotopes produced by the previous exposure of materials to cosmic rays on the Earth’s surface or even underground can become problematic for the required sensitivity. Here, the studies developed to quantify and reduce the activation yields in detectors and materials used in the set-up of these experiments will be reviewed, considering target materials like germanium, tellurium and xenon together with other ones commonly used like copper, lead, stainless steel or argon. Calculations following very different approaches and measurements from irradiation experiments using beams or directly cosmic rays will be considered for relevant radioisotopes. The effect of cosmogenic activation in present and future double beta decay projects based on different types of detectors will be analyzed too.

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Fluorescent bicolour sensor for low-background neutrinoless double β decay experiments

Cited by 43 publications

References 44 publications

Bicolour fluorescent molecular sensors for cations: design and experimental validation

Bicolour fluorescent molecular sensors for cations: design and experimental validation

Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution

Cosmogenic Activation in Double Beta Decay Experiments

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