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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.03441">arXiv:2311.03441</a> <span> [<a href="https://arxiv.org/pdf/2311.03441">pdf</a>, <a href="https://arxiv.org/format/2311.03441">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Demonstration of Event Position Reconstruction based on Diffusion in the NEXT-White Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Haefner%2C+J">J. Haefner</a>, <a href="/search/hep-ex?searchtype=author&query=Navarro%2C+K+E">K. E. Navarro</a>, <a href="/search/hep-ex?searchtype=author&query=Guenette%2C+R">R. Guenette</a>, <a href="/search/hep-ex?searchtype=author&query=Jones%2C+B+J+P">B. J. P. Jones</a>, <a href="/search/hep-ex?searchtype=author&query=Tripathi%2C+A">A. Tripathi</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Almaz%C3%A1n%2C+H">H. Almaz谩n</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Aparicio%2C+B">B. Aparicio</a>, <a href="/search/hep-ex?searchtype=author&query=Aranburu%2C+A+I">A. I. Aranburu</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Auria-Luna%2C+F">F. Auria-Luna</a>, <a href="/search/hep-ex?searchtype=author&query=Ayet%2C+S">S. Ayet</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=del+Barrio-Torregrosa%2C+M">M. del Barrio-Torregrosa</a>, <a href="/search/hep-ex?searchtype=author&query=Bayo%2C+A">A. Bayo</a>, <a href="/search/hep-ex?searchtype=author&query=BenllochRodr%C3%ADguez%2C+J+M">J. M. BenllochRodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Brodolin%2C+A">A. Brodolin</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a> , et al. (86 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.03441v1-abstract-short" style="display: inline;"> Noble element time projection chambers are a leading technology for rare event detection in physics, such as for dark matter and neutrinoless double beta decay searches. Time projection chambers typically assign event position in the drift direction using the relative timing of prompt scintillation and delayed charge collection signals, allowing for reconstruction of an absolute position in the dr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.03441v1-abstract-full').style.display = 'inline'; document.getElementById('2311.03441v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.03441v1-abstract-full" style="display: none;"> Noble element time projection chambers are a leading technology for rare event detection in physics, such as for dark matter and neutrinoless double beta decay searches. Time projection chambers typically assign event position in the drift direction using the relative timing of prompt scintillation and delayed charge collection signals, allowing for reconstruction of an absolute position in the drift direction. In this paper, alternate methods for assigning event drift distance via quantification of electron diffusion in a pure high pressure xenon gas time projection chamber are explored. Data from the NEXT-White detector demonstrate the ability to achieve good position assignment accuracy for both high- and low-energy events. Using point-like energy deposits from $^{83\mathrm{m}}$Kr calibration electron captures ($E\sim45$keV), the position of origin of low-energy events is determined to $2~$cm precision with bias $< 1$mm. A convolutional neural network approach is then used to quantify diffusion for longer tracks (E$\geq$1.5MeV), yielding a precision of 3cm on the event barycenter. The precision achieved with these methods indicates the feasibility energy calibrations of better than 1% FWHM at Q$_{尾尾}$ in pure xenon, as well as the potential for event fiducialization in large future detectors using an alternate method that does not rely on primary scintillation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.03441v1-abstract-full').style.display = 'none'; document.getElementById('2311.03441v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 16 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.09435">arXiv:2305.09435</a> <span> [<a href="https://arxiv.org/pdf/2305.09435">pdf</a>, <a href="https://arxiv.org/format/2305.09435">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP09(2023)190">10.1007/JHEP09(2023)190 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Demonstration of neutrinoless double beta decay searches in gaseous xenon with NEXT </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Novella%2C+P">P. Novella</a>, <a href="/search/hep-ex?searchtype=author&query=Sorel%2C+M">M. Sorel</a>, <a href="/search/hep-ex?searchtype=author&query=Us%C3%B3n%2C+A">A. Us贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Almaz%C3%A1n%2C+H">H. Almaz谩n</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Aparicio%2C+B">B. Aparicio</a>, <a href="/search/hep-ex?searchtype=author&query=Aranburu%2C+A+I">A. I. Aranburu</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Auria-Luna%2C+F">F. Auria-Luna</a>, <a href="/search/hep-ex?searchtype=author&query=Ayet%2C+S">S. Ayet</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=del+Barrio-Torregrosa%2C+M">M. del Barrio-Torregrosa</a>, <a href="/search/hep-ex?searchtype=author&query=Bayo%2C+A">A. Bayo</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Bounasser%2C+S">S. Bounasser</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a> , et al. (90 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.09435v4-abstract-short" style="display: inline;"> The NEXT experiment aims at the sensitive search of the neutrinoless double beta decay in $^{136}$Xe, using high-pressure gas electroluminescent time projection chambers. The NEXT-White detector is the first radiopure demonstrator of this technology, operated in the Laboratorio Subterr谩neo de Canfranc. Achieving an energy resolution of 1% FWHM at 2.6 MeV and further background rejection by means o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.09435v4-abstract-full').style.display = 'inline'; document.getElementById('2305.09435v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.09435v4-abstract-full" style="display: none;"> The NEXT experiment aims at the sensitive search of the neutrinoless double beta decay in $^{136}$Xe, using high-pressure gas electroluminescent time projection chambers. The NEXT-White detector is the first radiopure demonstrator of this technology, operated in the Laboratorio Subterr谩neo de Canfranc. Achieving an energy resolution of 1% FWHM at 2.6 MeV and further background rejection by means of the topology of the reconstructed tracks, NEXT-White has been exploited beyond its original goals in order to perform a neutrinoless double beta decay search. The analysis considers the combination of 271.6 days of $^{136}$Xe-enriched data and 208.9 days of $^{136}$Xe-depleted data. A detailed background modeling and measurement has been developed, ensuring the time stability of the radiogenic and cosmogenic contributions across both data samples. Limits to the neutrinoless mode are obtained in two alternative analyses: a background-model-dependent approach and a novel direct background-subtraction technique, offering results with small dependence on the background model assumptions. With a fiducial mass of only 3.50$\pm$0.01 kg of $^{136}$Xe-enriched xenon, 90% C.L. lower limits to the neutrinoless double beta decay are found in the T$_{1/2}^{0谓}>5.5\times10^{23}-1.3\times10^{24}$ yr range, depending on the method. The presented techniques stand as a proof-of-concept for the searches to be implemented with larger NEXT detectors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.09435v4-abstract-full').style.display = 'none'; document.getElementById('2305.09435v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JHEP 09 (2023) 190 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.01522">arXiv:2303.01522</a> <span> [<a href="https://arxiv.org/pdf/2303.01522">pdf</a>, <a href="https://arxiv.org/format/2303.01522">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/18/07/P07044">10.1088/1748-0221/18/07/P07044 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Compact Dication Source for Ba$^{2+}$ Tagging and Heavy Metal Ion Sensor Development </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Navarro%2C+K+E">K. E. Navarro</a>, <a href="/search/hep-ex?searchtype=author&query=Jones%2C+B+J+P">B. J. P. Jones</a>, <a href="/search/hep-ex?searchtype=author&query=Baeza-Rubio%2C+J">J. Baeza-Rubio</a>, <a href="/search/hep-ex?searchtype=author&query=Boyd%2C+M">M. Boyd</a>, <a href="/search/hep-ex?searchtype=author&query=Denisenko%2C+A+A">A. A. Denisenko</a>, <a href="/search/hep-ex?searchtype=author&query=Foss%2C+F+W">F. W. Foss</a>, <a href="/search/hep-ex?searchtype=author&query=Giri%2C+S">S. Giri</a>, <a href="/search/hep-ex?searchtype=author&query=Miller%2C+R">R. Miller</a>, <a href="/search/hep-ex?searchtype=author&query=Nygren%2C+D+R">D. R. Nygren</a>, <a href="/search/hep-ex?searchtype=author&query=Tiscareno%2C+M+R">M. R. Tiscareno</a>, <a href="/search/hep-ex?searchtype=author&query=Samaniego%2C+F+J">F. J. Samaniego</a>, <a href="/search/hep-ex?searchtype=author&query=Stogsdill%2C+K">K. Stogsdill</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Almaz%C3%A1n%2C+H">H. Almaz谩n</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Aparicio%2C+B">B. Aparicio</a>, <a href="/search/hep-ex?searchtype=author&query=Aranburu%2C+A+I">A. I. Aranburu</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Ayet%2C+S">S. Ayet</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a> , et al. (85 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.01522v1-abstract-short" style="display: inline;"> We present a tunable metal ion beam that delivers controllable ion currents in the picoamp range for testing of dry-phase ion sensors. Ion beams are formed by sequential atomic evaporation and single or multiple electron impact ionization, followed by acceleration into a sensing region. Controllability of the ionic charge state is achieved through tuning of electrode potentials that influence the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.01522v1-abstract-full').style.display = 'inline'; document.getElementById('2303.01522v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.01522v1-abstract-full" style="display: none;"> We present a tunable metal ion beam that delivers controllable ion currents in the picoamp range for testing of dry-phase ion sensors. Ion beams are formed by sequential atomic evaporation and single or multiple electron impact ionization, followed by acceleration into a sensing region. Controllability of the ionic charge state is achieved through tuning of electrode potentials that influence the retention time in the ionization region. Barium, lead, and cobalt samples have been used to test the system, with ion currents identified and quantified using a quadrupole mass analyzer. Realization of a clean $\mathrm{Ba^{2+}}$ ion beam within a bench-top system represents an important technical advance toward the development and characterization of barium tagging systems for neutrinoless double beta decay searches in xenon gas. This system also provides a testbed for investigation of novel ion sensing methodologies for environmental assay applications, with dication beams of Pb$^{2+}$ and Cd$^{2+}$ also demonstrated for this purpose. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.01522v1-abstract-full').style.display = 'none'; document.getElementById('2303.01522v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.05024">arXiv:2211.05024</a> <span> [<a href="https://arxiv.org/pdf/2211.05024">pdf</a>, <a href="https://arxiv.org/format/2211.05024">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/18/03/P03016">10.1088/1748-0221/18/03/P03016 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Haefner%2C+J">J. Haefner</a>, <a href="/search/hep-ex?searchtype=author&query=Fahs%2C+A">A. Fahs</a>, <a href="/search/hep-ex?searchtype=author&query=Ho%2C+J">J. Ho</a>, <a href="/search/hep-ex?searchtype=author&query=Stanford%2C+C">C. Stanford</a>, <a href="/search/hep-ex?searchtype=author&query=Guenette%2C+R">R. Guenette</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Almaz%C3%A1n%2C+H">H. Almaz谩n</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Aparicio%2C+B">B. Aparicio</a>, <a href="/search/hep-ex?searchtype=author&query=Aranburu%2C+A+I">A. I. Aranburu</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Auria-Luna%2C+F">F. Auria-Luna</a>, <a href="/search/hep-ex?searchtype=author&query=Ayet%2C+S">S. Ayet</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Bounasser%2C+S">S. Bounasser</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a> , et al. (78 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.05024v3-abstract-short" style="display: inline;"> Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200~nm, 260~nm,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.05024v3-abstract-full').style.display = 'inline'; document.getElementById('2211.05024v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.05024v3-abstract-full" style="display: none;"> Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200~nm, 260~nm, and 450~nm. The results show that TPB-coated PTFE has a reflectance of approximately 92\% for thicknesses ranging from 5~mm to 10~mm at 450~nm, with negligible variation as a function of thickness within this range. A cross-check of these results using an argon chamber supports the conclusion that the change in thickness from 5~mm to 10~mm does not affect significantly the light response at 128~nm. Our results indicate that pieces of TPB-coated PTFE thinner than the typical 10~mm can be used in particle physics detectors without compromising the light signal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.05024v3-abstract-full').style.display = 'none'; document.getElementById('2211.05024v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.09099">arXiv:2201.09099</a> <span> [<a href="https://arxiv.org/pdf/2201.09099">pdf</a>, <a href="https://arxiv.org/format/2201.09099">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-022-35153-0">10.1038/s41467-022-35153-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ba$^{2+}$ ion trapping by organic submonolayer: towards an ultra-low background neutrinoless double beta decay detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Herrero-G%C3%B3mez%2C+P">P. Herrero-G贸mez</a>, <a href="/search/hep-ex?searchtype=author&query=Calupitan%2C+J+P">J. P. Calupitan</a>, <a href="/search/hep-ex?searchtype=author&query=Ilyn%2C+M">M. Ilyn</a>, <a href="/search/hep-ex?searchtype=author&query=Berdonces-Layunta%2C+A">A. Berdonces-Layunta</a>, <a href="/search/hep-ex?searchtype=author&query=Wang%2C+T">T. Wang</a>, <a href="/search/hep-ex?searchtype=author&query=de+Oteyza%2C+D+G">D. G. de Oteyza</a>, <a href="/search/hep-ex?searchtype=author&query=Corso%2C+M">M. Corso</a>, <a href="/search/hep-ex?searchtype=author&query=Gonz%C3%A1lez-Moreno%2C+R">R. Gonz谩lez-Moreno</a>, <a href="/search/hep-ex?searchtype=author&query=Rivilla%2C+I">I. Rivilla</a>, <a href="/search/hep-ex?searchtype=author&query=Aparicio%2C+B">B. Aparicio</a>, <a href="/search/hep-ex?searchtype=author&query=Aranburu%2C+A+I">A. I. Aranburu</a>, <a href="/search/hep-ex?searchtype=author&query=Freixa%2C+Z">Z. Freixa</a>, <a href="/search/hep-ex?searchtype=author&query=Monrabal%2C+F">F. Monrabal</a>, <a href="/search/hep-ex?searchtype=author&query=Coss%C3%ADo%2C+F+P">F. P. Coss铆o</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Rogero%2C+C">C. Rogero</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Almaz%C3%A1n%2C+H">H. Almaz谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez%2C+V">V. Alvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Ayet%2C+S">S. Ayet</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a> , et al. (90 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.09099v1-abstract-short" style="display: inline;"> If neutrinos are their own antiparticles, the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay ($尾尾0谓$) can occur, with a characteristic lifetime which is expected to be very long, making the suppression of backgrounds a daunting task. It has been shown that detecting (``tagging'') the Ba$^{+2}$ dication produced in the double beta decay… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.09099v1-abstract-full').style.display = 'inline'; document.getElementById('2201.09099v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.09099v1-abstract-full" style="display: none;"> If neutrinos are their own antiparticles, the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay ($尾尾0谓$) can occur, with a characteristic lifetime which is expected to be very long, making the suppression of backgrounds a daunting task. It has been shown that detecting (``tagging'') the Ba$^{+2}$ dication produced in the double beta decay ${}^{136}\mathrm{Xe} \rightarrow {}^{136}$Ba$^{+2}+ 2 e + (2 谓)$ in a high pressure gas experiment, could lead to a virtually background free experiment. To identify these \Bapp, chemical sensors are being explored as a key tool by the NEXT collaboration . Although used in many fields, the application of such chemosensors to the field of particle physics is totally novel and requires experimental demonstration of their suitability in the ultra-dry environment of a xenon gas chamber. Here we use a combination of complementary surface science techniques to unambiguously show that Ba$^{+2}$ ions can be trapped (chelated) in vacuum by an organic molecule, the so-called fluorescent bicolour indicator (FBI) (one of the chemosensors developed by NEXT), immobilized on a surface. We unravel the ion capture mechanism once the molecules are immobilised on Au(111) surface and explain the origin of the emission fluorescence shift associated to the trapping of different ions. Moreover, we prove that chelation also takes place on a technologically relevant substrate, as such, demonstrating the feasibility of using FBI indicators as building blocks of a Ba$^{+2}$ detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.09099v1-abstract-full').style.display = 'none'; document.getElementById('2201.09099v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.11091">arXiv:2111.11091</a> <span> [<a href="https://arxiv.org/pdf/2111.11091">pdf</a>, <a href="https://arxiv.org/format/2111.11091">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.105.055501">10.1103/PhysRevC.105.055501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the ${}^{136}$Xe two-neutrino double beta decay half-life via direct background subtraction in NEXT </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Novella%2C+P">P. Novella</a>, <a href="/search/hep-ex?searchtype=author&query=Sorel%2C+M">M. Sorel</a>, <a href="/search/hep-ex?searchtype=author&query=Us%C3%B3n%2C+A">A. Us贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Almaz%C3%A1n%2C+H">H. Almaz谩n</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Aparicio%2C+B">B. Aparicio</a>, <a href="/search/hep-ex?searchtype=author&query=Aranburu%2C+A+I">A. I. Aranburu</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Ayet%2C+S">S. Ayet</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Bounasser%2C+S">S. Bounasser</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Contreras%2C+T">T. Contreras</a> , et al. (85 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.11091v3-abstract-short" style="display: inline;"> We report a measurement of the half-life of the ${}^{136}$Xe two-neutrino double beta decay performed with a novel direct background subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with ${}^{136}$Xe-enriched and ${}^{136}$Xe-depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.11091v3-abstract-full').style.display = 'inline'; document.getElementById('2111.11091v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.11091v3-abstract-full" style="display: none;"> We report a measurement of the half-life of the ${}^{136}$Xe two-neutrino double beta decay performed with a novel direct background subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with ${}^{136}$Xe-enriched and ${}^{136}$Xe-depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-life of $2.34^{+0.80}_{-0.46}\textrm{(stat)}^{+0.30}_{-0.17}\textrm{(sys)}\times10^{21}~\textrm{yr}$ is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double beta decay searches. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.11091v3-abstract-full').style.display = 'none'; document.getElementById('2111.11091v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures, and 1 appendix</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 105, 055501 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.11931">arXiv:2102.11931</a> <span> [<a href="https://arxiv.org/pdf/2102.11931">pdf</a>, <a href="https://arxiv.org/format/2102.11931">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP07(2021)146">10.1007/JHEP07(2021)146 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Sim%C3%B3n%2C+A">A. Sim贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Ifergan%2C+Y">Y. Ifergan</a>, <a href="/search/hep-ex?searchtype=author&query=Redwine%2C+A+B">A. B. Redwine</a>, <a href="/search/hep-ex?searchtype=author&query=Weiss-Babai%2C+R">R. Weiss-Babai</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Almaz%C3%A1n%2C+H">H. Almaz谩n</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Aparicio%2C+B">B. Aparicio</a>, <a href="/search/hep-ex?searchtype=author&query=Aranburu%2C+A+I">A. I. Aranburu</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Contreras%2C+T">T. Contreras</a>, <a href="/search/hep-ex?searchtype=author&query=Coss%C3%ADo%2C+F+P">F. P. Coss铆o</a>, <a href="/search/hep-ex?searchtype=author&query=Denisenko%2C+A+A">A. A. Denisenko</a> , et al. (78 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2102.11931v3-abstract-short" style="display: inline;"> Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ~$10^{27}$ 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 d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.11931v3-abstract-full').style.display = 'inline'; document.getElementById('2102.11931v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.11931v3-abstract-full" style="display: none;"> Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ~$10^{27}$ 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 $^{208}$Tl 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterr谩neo 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. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.11931v3-abstract-full').style.display = 'none'; document.getElementById('2102.11931v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to JHEP</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of High Energy Physics 2021, 146 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.10783">arXiv:2009.10783</a> <span> [<a href="https://arxiv.org/pdf/2009.10783">pdf</a>, <a href="https://arxiv.org/format/2009.10783">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP01(2021)189">10.1007/JHEP01(2021)189 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Demonstration of background rejection using deep convolutional neural networks in the NEXT experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Kekic%2C+M">M. Kekic</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Woodruff%2C+K">K. Woodruff</a>, <a href="/search/hep-ex?searchtype=author&query=Renner%2C+J">J. Renner</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/hep-ex?searchtype=author&query=Del+Tutto%2C+M">M. Del Tutto</a>, <a href="/search/hep-ex?searchtype=author&query=Morata%2C+J+A+H">J. A. Hernando Morata</a>, <a href="/search/hep-ex?searchtype=author&query=Gomez-Cadenas%2C+J+J">J. J. Gomez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez%2C+V">V. Alvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodriguez%2C+J+M">J. M. Benlloch-Rodriguez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=Carcel%2C+S">S. Carcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carrion%2C+J+V">J. V. Carrion</a>, <a href="/search/hep-ex?searchtype=author&query=Cebrian%2C+S">S. Cebrian</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Contreras%2C+T">T. Contreras</a>, <a href="/search/hep-ex?searchtype=author&query=Diaz%2C+G">G. Diaz</a>, <a href="/search/hep-ex?searchtype=author&query=Diaz%2C+J">J. Diaz</a> , et al. (66 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.10783v2-abstract-short" style="display: inline;"> Convolutional neural networks (CNNs) are widely used state-of-the-art computer vision tools that are becoming increasingly popular in high energy physics. In this paper, we attempt to understand the potential of CNNs for event classification in the NEXT experiment, which will search for neutrinoless double-beta decay in $^{136}$Xe. To do so, we demonstrate the usage of CNNs for the identification… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.10783v2-abstract-full').style.display = 'inline'; document.getElementById('2009.10783v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.10783v2-abstract-full" style="display: none;"> Convolutional neural networks (CNNs) are widely used state-of-the-art computer vision tools that are becoming increasingly popular in high energy physics. In this paper, we attempt to understand the potential of CNNs for event classification in the NEXT experiment, which will search for neutrinoless double-beta decay in $^{136}$Xe. To do so, we demonstrate the usage of CNNs for the identification of electron-positron pair production events, which exhibit a topology similar to that of a neutrinoless double-beta decay event. These events were produced in the NEXT-White high-pressure xenon TPC using 2.6-MeV gamma rays from a $^{228}$Th calibration source. We train a network on Monte Carlo-simulated events and show that, by applying on-the-fly data augmentation, the network can be made robust against differences between simulation and data. The use of CNNs offer significant improvement in signal efficiency/background rejection when compared to previous non-CNN-based analyses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.10783v2-abstract-full').style.display = 'none'; document.getElementById('2009.10783v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 10 figures; version matches published JHEP version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.07320">arXiv:2006.07320</a> <span> [<a href="https://arxiv.org/pdf/2006.07320">pdf</a>, <a href="https://arxiv.org/format/2006.07320">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP02(2021)203">10.1007/JHEP02(2021)203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sensitivity of the NEXT experiment to Xe-124 double electron capture </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Mart%C3%ADnez-Lema%2C+G">G. Mart铆nez-Lema</a>, <a href="/search/hep-ex?searchtype=author&query=Mart%C3%ADnez-Vara%2C+M">M. Mart铆nez-Vara</a>, <a href="/search/hep-ex?searchtype=author&query=Sorel%2C+M">M. Sorel</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez%2C+V">V. Alvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Contreras%2C+T">T. Contreras</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+G">G. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Felkai%2C+R">R. Felkai</a> , et al. (66 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.07320v3-abstract-short" style="display: inline;"> Double electron capture by proton-rich nuclei is a second-order nuclear process analogous to double beta decay. Despite their similarities, the decay signature is quite different, potentially providing a new channel to measure the hypothesized neutrinoless mode of these decays. The Standard-Model-allowed two-neutrino double electron capture ($2谓ECEC$) has been predicted for a number of isotopes, b… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.07320v3-abstract-full').style.display = 'inline'; document.getElementById('2006.07320v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.07320v3-abstract-full" style="display: none;"> Double electron capture by proton-rich nuclei is a second-order nuclear process analogous to double beta decay. Despite their similarities, the decay signature is quite different, potentially providing a new channel to measure the hypothesized neutrinoless mode of these decays. The Standard-Model-allowed two-neutrino double electron capture ($2谓ECEC$) has been predicted for a number of isotopes, but only observed in $^{78}$Kr, $^{130}$Ba and, recently, $^{124}$Xe. The sensitivity to this decay establishes a benchmark for the ultimate experimental goal, namely the potential to discover also the lepton-number-violating neutrinoless version of this process, $0谓ECEC$. Here we report on the current sensitivity of the NEXT-White detector to $^{124}$Xe $2谓ECEC$ and on the extrapolation to NEXT-100. Using simulated data for the $2谓ECEC$ signal and real data from NEXT-White operated with $^{124}$Xe-depleted gas as background, we define an optimal event selection that maximizes the NEXT-White sensitivity. We estimate that, for NEXT-100 operated with xenon gas isotopically enriched with 1 kg of $^{124}$Xe and for a 5-year run, a sensitivity to the $2谓ECEC$ half-life of $6 \times 10^{22}$ y (at 90% confidence level) or better can be reached. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.07320v3-abstract-full').style.display = 'none'; document.getElementById('2006.07320v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 13 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. High Energ. Phys. 2021, 203 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2001.11147">arXiv:2001.11147</a> <span> [<a href="https://arxiv.org/pdf/2001.11147">pdf</a>, <a href="https://arxiv.org/format/2001.11147">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6471/ab8915">10.1088/1361-6471/ab8915 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Mitigation of Backgrounds from Cosmogenic $^{137}$Xe in Xenon Gas Experiments using $^{3}$He Neutron Capture </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Rogers%2C+L">L. Rogers</a>, <a href="/search/hep-ex?searchtype=author&query=Jones%2C+B+J+P">B. J. P. Jones</a>, <a href="/search/hep-ex?searchtype=author&query=Laing%2C+A">A. Laing</a>, <a href="/search/hep-ex?searchtype=author&query=Pingulkar%2C+S">S. Pingulkar</a>, <a href="/search/hep-ex?searchtype=author&query=Woodruff%2C+K">K. Woodruff</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Contreras%2C+T">T. Contreras</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+G">G. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Dingler%2C+R">R. Dingler</a> , et al. (67 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2001.11147v2-abstract-short" style="display: inline;"> \Xe{136} is used as the target medium for many experiments searching for \bbnonu. Despite underground operation, cosmic muons that reach the laboratory can produce spallation neutrons causing activation of detector materials. A potential background that is difficult to veto using muon tagging comes in the form of \Xe{137} created by the capture of neutrons on \Xe{136}. This isotope decays via beta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.11147v2-abstract-full').style.display = 'inline'; document.getElementById('2001.11147v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2001.11147v2-abstract-full" style="display: none;"> \Xe{136} is used as the target medium for many experiments searching for \bbnonu. Despite underground operation, cosmic muons that reach the laboratory can produce spallation neutrons causing activation of detector materials. A potential background that is difficult to veto using muon tagging comes in the form of \Xe{137} created by the capture of neutrons on \Xe{136}. This isotope decays via beta decay with a half-life of 3.8 minutes and a \Qb\ of $\sim$4.16 MeV. This work proposes and explores the concept of adding a small percentage of \He{3} to xenon as a means to capture thermal neutrons and reduce the number of activations in the detector volume. When using this technique we find the contamination from \Xe{137} activation can be reduced to negligible levels in tonne and multi-tonne scale high pressure gas xenon neutrinoless double beta decay experiments running at any depth in an underground laboratory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.11147v2-abstract-full').style.display = 'none'; document.getElementById('2001.11147v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.13625">arXiv:1905.13625</a> <span> [<a href="https://arxiv.org/pdf/1905.13625">pdf</a>, <a href="https://arxiv.org/format/1905.13625">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP10(2019)051">10.1007/JHEP10(2019)051 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Radiogenic backgrounds in the NEXT double beta decay experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Novella%2C+P">P. Novella</a>, <a href="/search/hep-ex?searchtype=author&query=Palmeiro%2C+B">B. Palmeiro</a>, <a href="/search/hep-ex?searchtype=author&query=Sorel%2C+M">M. Sorel</a>, <a href="/search/hep-ex?searchtype=author&query=Us%C3%B3n%2C+A">A. Us贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Contreras%2C+T">T. Contreras</a>, <a href="/search/hep-ex?searchtype=author&query=L%C3%B3pez%2C+G+D">G. D铆az L贸pez</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a> , et al. (66 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.13625v3-abstract-short" style="display: inline;"> Natural radioactivity represents one of the main backgrounds in the search for neutrinoless double beta decay. Within the NEXT physics program, the radioactivity-induced backgrounds are measured with the NEXT-White detector. Data from 37.9 days of low-background operations at the Laboratorio Subterr谩neo de Canfranc with xenon depleted in $^{136}$Xe are analyzed to derive a total background rate of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.13625v3-abstract-full').style.display = 'inline'; document.getElementById('1905.13625v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.13625v3-abstract-full" style="display: none;"> Natural radioactivity represents one of the main backgrounds in the search for neutrinoless double beta decay. Within the NEXT physics program, the radioactivity-induced backgrounds are measured with the NEXT-White detector. Data from 37.9 days of low-background operations at the Laboratorio Subterr谩neo de Canfranc with xenon depleted in $^{136}$Xe are analyzed to derive a total background rate of (0.84$\pm$0.02) mHz above 1000 keV. The comparison of data samples with and without the use of the radon abatement system demonstrates that the contribution of airborne-Rn is negligible. A radiogenic background model is built upon the extensive radiopurity screening campaign conducted by the NEXT Collaboration. A spectral fit to this model yields the specific contributions of $^{60}$Co, $^{40}$K, $^{214}$Bi and $^{208}$Tl to the total background rate, as well as their location in the detector volumes. The results are used to evaluate the impact of the radiogenic backgrounds in the double beta decay analyses, after the application of topological cuts that reduce the total rate to (0.25$\pm$0.01) mHz. Based on the best-fit background model, the NEXT-White median sensitivity to the two-neutrino double beta decay is found to be 3.5$蟽$ after 1 year of data taking. The background measurement in a Q$_{尾尾}\pm$100 keV energy window validates the best-fit background model also for the neutrinoless double beta decay search with NEXT-100. Only one event is found, while the model expectation is (0.75$\pm$0.12) events. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.13625v3-abstract-full').style.display = 'none'; document.getElementById('1905.13625v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JHEP 10 (2019) 51 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.13141">arXiv:1905.13141</a> <span> [<a href="https://arxiv.org/pdf/1905.13141">pdf</a>, <a href="https://arxiv.org/format/1905.13141">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP10(2019)052">10.1007/JHEP10(2019)052 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Demonstration of the event identification capabilities of the NEXT-White detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=L%C3%B3pez%2C+G+D">G. D铆az L贸pez</a>, <a href="/search/hep-ex?searchtype=author&query=Morata%2C+J+A+H">J. A. Hernando Morata</a>, <a href="/search/hep-ex?searchtype=author&query=Kekic%2C+M">M. Kekic</a>, <a href="/search/hep-ex?searchtype=author&query=Renner%2C+J">J. Renner</a>, <a href="/search/hep-ex?searchtype=author&query=Us%C3%B3n%2C+A">A. Us贸n</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Byrnes%2C+N">N. Byrnes</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=Contreras%2C+T">T. Contreras</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a> , et al. (66 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.13141v3-abstract-short" style="display: inline;"> In experiments searching for neutrinoless double-beta decay, the possibility of identifying the two emitted electrons is a powerful tool in rejecting background events and therefore improving the overall sensitivity of the experiment. In this paper we present the first measurement of the efficiency of a cut based on the different event signatures of double and single electron tracks, using the dat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.13141v3-abstract-full').style.display = 'inline'; document.getElementById('1905.13141v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.13141v3-abstract-full" style="display: none;"> In experiments searching for neutrinoless double-beta decay, the possibility of identifying the two emitted electrons is a powerful tool in rejecting background events and therefore improving the overall sensitivity of the experiment. In this paper we present the first measurement of the efficiency of a cut based on the different event signatures of double and single electron tracks, using the data of the NEXT-White detector, the first detector of the NEXT experiment operating underground. Using a \TO\ calibration source to produce signal-like and background-like events with energies near 1.6 MeV, a signal efficiency of $71.6 \pm 1.5_{\textrm{ stat}} \pm 0.3_{\textrm{ sys}} \%$ for a background acceptance of $20.6 \pm 0.4_{\textrm{ stat}} \pm 0.3_{\textrm{ sys}} \%$ is found, in good agreement with Monte Carlo simulations. An extrapolation to the energy region of the neutrinoless double beta decay by means of Monte Carlo simulations is also carried out, and the results obtained show an improvement in background rejection over those obtained at lower energies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.13141v3-abstract-full').style.display = 'none'; document.getElementById('1905.13141v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted by JHEP</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.05891">arXiv:1806.05891</a> <span> [<a href="https://arxiv.org/pdf/1806.05891">pdf</a>, <a href="https://arxiv.org/format/1806.05891">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP01(2019)027">10.1007/JHEP01(2019)027 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electroluminescence TPCs at the thermal diffusion limit </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Henriques%2C+C+A+O">C. A. O. Henriques</a>, <a href="/search/hep-ex?searchtype=author&query=Monteiro%2C+C+M+B">C. M. B. Monteiro</a>, <a href="/search/hep-ex?searchtype=author&query=Gonz%C3%A1lez-D%C3%ADaz%2C+D">D. Gonz谩lez-D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Mano%2C+R+D+P">R. D. P. Mano</a>, <a href="/search/hep-ex?searchtype=author&query=Jorge%2C+M+R">M. R. Jorge</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+A+F+M">A. F. M. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a> , et al. (56 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.05891v2-abstract-short" style="display: inline;"> The NEXT experiment aims at searching for the hypothetical neutrinoless double-beta decay from the ${}^{136}$Xe isotope using a high-purity xenon TPC. Efficient discrimination of the events through pattern recognition of the topology of primary ionisation tracks is a major requirement for the experiment. However, it is limited by the diffusion of electrons. It is known that the addition of a small… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.05891v2-abstract-full').style.display = 'inline'; document.getElementById('1806.05891v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.05891v2-abstract-full" style="display: none;"> The NEXT experiment aims at searching for the hypothetical neutrinoless double-beta decay from the ${}^{136}$Xe isotope using a high-purity xenon TPC. Efficient discrimination of the events through pattern recognition of the topology of primary ionisation tracks is a major requirement for the experiment. However, it is limited by the diffusion of electrons. It is known that the addition of a small fraction of a molecular gas to xenon reduces electron diffusion. On the other hand, the electroluminescence (EL) yield drops and the achievable energy resolution may be compromised. We have studied the effect of adding several molecular gases to xenon (CO${}_{2}$, CH${}_{4}$ and CF${}_{4}$) on the EL yield and energy resolution obtained in a small prototype of driftless gas proportional scintillation counter. We have compared our results on the scintillation characteristics (EL yield and energy resolution) with a microscopic simulation, obtaining the diffusion coefficients in those conditions as well. Accordingly, electron diffusion may be reduced from about 10 mm/$\sqrt{\mathrm{m}}$ for pure xenon down to 2.5 mm/$\sqrt{\mathrm{m}}$ using additive concentrations of about 0.05%, 0.2% and 0.02% for CO${}_{2}$, CH${}_{4}$ and CF${}_{4}$, respectively. Our results show that CF${}_{4}$ admixtures present the highest EL yield in those conditions, but very poor energy resolution as a result of huge fluctuations observed in the EL formation. CH${}_{4}$ presents the best energy resolution despite the EL yield being the lowest. The results obtained with xenon admixtures are extrapolated to the operational conditions of the NEXT-100 TPC. CO${}_{2}$ and CH${}_{4}$ show potential as molecular additives in a large xenon TPC, CH${}_{4}$ showing the best performance and stability to be used in the NEXT-100 TPC, with an extrapolated energy resolution of 0.4% at 2.45 MeV for concentrations below 0.4%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.05891v2-abstract-full').style.display = 'none'; document.getElementById('1806.05891v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 85-05 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.01780">arXiv:1804.01780</a> <span> [<a href="https://arxiv.org/pdf/1804.01780">pdf</a>, <a href="https://arxiv.org/format/1804.01780">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/13/10/P10014">10.1088/1748-0221/13/10/P10014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Calibration of the NEXT-White detector using $^{83m}\mathrm{Kr}$ decays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Mart%C3%ADnez-Lema%2C+G">G. Mart铆nez-Lema</a>, <a href="/search/hep-ex?searchtype=author&query=Morata%2C+J+A+H">J. A. Hernando Morata</a>, <a href="/search/hep-ex?searchtype=author&query=Palmeiro%2C+B">B. Palmeiro</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Monrabal%2C+F">F. Monrabal</a>, <a href="/search/hep-ex?searchtype=author&query=Laing%2C+A">A. Laing</a>, <a href="/search/hep-ex?searchtype=author&query=Renner%2C+J">J. Renner</a>, <a href="/search/hep-ex?searchtype=author&query=Sim%C3%B3n%2C+A">A. Sim贸n</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a> , et al. (52 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1804.01780v5-abstract-short" style="display: inline;"> The NEXT-White (NEW) detector is currently the largest radio-pure high-pressure xenon gas time projection chamber with electroluminescent readout in the world. NEXT-White has been operating at Laboratorio Subterr谩neo de Canfranc (LSC) since October 2016. This paper describes the calibrations performed with $^{83m}\mathrm{Kr}$ decays during a long run taken from March to November 2017 (Run II). Kry… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.01780v5-abstract-full').style.display = 'inline'; document.getElementById('1804.01780v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.01780v5-abstract-full" style="display: none;"> The NEXT-White (NEW) detector is currently the largest radio-pure high-pressure xenon gas time projection chamber with electroluminescent readout in the world. NEXT-White has been operating at Laboratorio Subterr谩neo de Canfranc (LSC) since October 2016. This paper describes the calibrations performed with $^{83m}\mathrm{Kr}$ decays during a long run taken from March to November 2017 (Run II). Krypton calibrations are used to correct for the finite drift-electron lifetime as well as for the dependence of the measured energy on the event position which is mainly caused by variations in solid angle coverage. After producing calibration maps to correct for both effects we measure an excellent energy resolution for 41.5 keV point-like deposits of (4.553 $\pm$ 0.010 (stat.) $\pm$ 0.324 (sys.)) % FWHM in the full chamber and (3.804 $\pm$ 0.013 (stat.) $\pm$ 0.112 (sys.)) % FWHM in a restricted fiducial volume. Using naive 1/$\sqrt{E}$ scaling, these values translate into resolutions of (0.516 $\pm$ 0.0014 (stat.) $\pm$ 0.0421 (sys.)) % FWHM and (0.4943 $\pm$ 0.0017 (stat.) $\pm$ 0.0146 (sys.)) % FWHM at the $Q_{尾尾}$ energy of xenon double beta decay (2458 keV), well within range of our target value of 1%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.01780v5-abstract-full').style.display = 'none'; document.getElementById('1804.01780v5-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 18 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.01680">arXiv:1804.01680</a> <span> [<a href="https://arxiv.org/pdf/1804.01680">pdf</a>, <a href="https://arxiv.org/format/1804.01680">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/13/07/P07013">10.1088/1748-0221/13/07/P07013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electron drift properties in high pressure gaseous xenon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Sim%C3%B3n%2C+A">A. Sim贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Felkai%2C+R">R. Felkai</a>, <a href="/search/hep-ex?searchtype=author&query=Mart%C3%ADnez-Lema%2C+G">G. Mart铆nez-Lema</a>, <a href="/search/hep-ex?searchtype=author&query=Monrabal%2C+F">F. Monrabal</a>, <a href="/search/hep-ex?searchtype=author&query=Gonz%C3%A1lez-D%C3%ADaz%2C+D">D. Gonz谩lez-D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Sorel%2C+M">M. Sorel</a>, <a href="/search/hep-ex?searchtype=author&query=Morata%2C+J+A+H">J. A. Hernando Morata</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a> , et al. (51 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1804.01680v3-abstract-short" style="display: inline;"> Gaseous time projection chambers (TPC) are a very attractive detector technology for particle tracking. Characterization of both drift velocity and diffusion is of great importance to correctly assess their tracking capabilities. NEXT-White is a High Pressure Xenon gas TPC with electroluminescent amplification, a 1:2 scale model of the future NEXT-100 detector, which will be dedicated to neutrinol… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.01680v3-abstract-full').style.display = 'inline'; document.getElementById('1804.01680v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.01680v3-abstract-full" style="display: none;"> Gaseous time projection chambers (TPC) are a very attractive detector technology for particle tracking. Characterization of both drift velocity and diffusion is of great importance to correctly assess their tracking capabilities. NEXT-White is a High Pressure Xenon gas TPC with electroluminescent amplification, a 1:2 scale model of the future NEXT-100 detector, which will be dedicated to neutrinoless double beta decay searches. NEXT-White has been operating at Canfranc Underground Laboratory (LSC) since December 2016. The drift parameters have been measured using $^{83m}$Kr for a range of reduced drift fields at two different pressure regimes, namely 7.2 bar and 9.1 bar. The results have been compared with Magboltz simulations. Agreement at the 5% level or better has been found for drift velocity, longitudinal diffusion and transverse diffusion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.01680v3-abstract-full').style.display = 'none'; document.getElementById('1804.01680v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 17 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.00471">arXiv:1804.00471</a> <span> [<a href="https://arxiv.org/pdf/1804.00471">pdf</a>, <a href="https://arxiv.org/format/1804.00471">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Measurement of radon-induced backgrounds in the NEXT double beta decay experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Novella%2C+P">P. Novella</a>, <a href="/search/hep-ex?searchtype=author&query=Palmeiro%2C+B">B. Palmeiro</a>, <a href="/search/hep-ex?searchtype=author&query=Sim%C3%B3n%2C+A">A. Sim贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Sorel%2C+M">M. Sorel</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Mart%C3%ADnez-Lema%2C+G">G. Mart铆nez-Lema</a>, <a href="/search/hep-ex?searchtype=author&query=Monrabal%2C+F">F. Monrabal</a>, <a href="/search/hep-ex?searchtype=author&query=Zuzel%2C+G">G. Zuzel</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Bailey%2C+K">K. Bailey</a>, <a href="/search/hep-ex?searchtype=author&query=Ballester%2C+F">F. Ballester</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a> , et al. (57 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1804.00471v3-abstract-short" style="display: inline;"> The measurement of the internal $^{222}$Rn activity in the NEXT-White detector during the so-called Run-II period with $^{136}$Xe-depleted xenon is discussed in detail, together with its implications for double beta decay searches in NEXT. The activity is measured through the alpha production rate induced in the fiducial volume by $^{222}$Rn and its alpha-emitting progeny. The specific activity is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.00471v3-abstract-full').style.display = 'inline'; document.getElementById('1804.00471v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.00471v3-abstract-full" style="display: none;"> The measurement of the internal $^{222}$Rn activity in the NEXT-White detector during the so-called Run-II period with $^{136}$Xe-depleted xenon is discussed in detail, together with its implications for double beta decay searches in NEXT. The activity is measured through the alpha production rate induced in the fiducial volume by $^{222}$Rn and its alpha-emitting progeny. The specific activity is measured to be $(38.1\pm 2.2~\mathrm{(stat.)}\pm 5.9~\mathrm{(syst.)})$~mBq/m$^3$. Radon-induced electrons have also been characterized from the decay of the $^{214}$Bi daughter ions plating out on the cathode of the time projection chamber. From our studies, we conclude that radon-induced backgrounds are sufficiently low to enable a successful NEXT-100 physics program, as the projected rate contribution should not exceed 0.1~counts/yr in the neutrinoless double beta decay sample. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.00471v3-abstract-full').style.display = 'none'; document.getElementById('1804.00471v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 pages, 10 figures, 6 tables. Version accepted for publication in JHEP</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.04782">arXiv:1711.04782</a> <span> [<a href="https://arxiv.org/pdf/1711.04782">pdf</a>, <a href="https://arxiv.org/format/1711.04782">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.120.132504">10.1103/PhysRevLett.120.132504 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Demonstration of Single Barium Ion Sensitivity for Neutrinoless Double Beta Decay using Single Molecule Fluorescence Imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=McDonald%2C+A+D">A. D. McDonald</a>, <a href="/search/hep-ex?searchtype=author&query=Jones%2C+B+J+P">B. J. P. Jones</a>, <a href="/search/hep-ex?searchtype=author&query=Nygren%2C+D+R">D. R. Nygren</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=Alvarez%2C+V">V. Alvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C4%B1guez%2C+J+M">J. M. Benlloch-Rodr谋guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=Carcel%2C+S">S. Carcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carrion%2C+J+V">J. V. Carrion</a>, <a href="/search/hep-ex?searchtype=author&query=Cebrian%2C+S">S. Cebrian</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C4%B1az%2C+J">J. D谋az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Felkai%2C+R">R. Felkai</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Goldschmidt%2C+A">A. Goldschmidt</a>, <a href="/search/hep-ex?searchtype=author&query=Gomez-Cadenas%2C+J+J">J. J. Gomez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Gonzalez-D%C4%B1az%2C+D">D. Gonzalez-D谋az</a> , et al. (49 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.04782v3-abstract-short" style="display: inline;"> A new method to tag the barium daughter in the double beta decay of $^{136}$Xe is reported. Using the technique of single molecule fluorescent imaging (SMFI), individual barium dication (Ba$^{++}$) resolution at a transparent scanning surface has been demonstrated. A single-step photo-bleach confirms the single ion interpretation. Individual ions are localized with super-resolution ($\sim$2~nm), a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.04782v3-abstract-full').style.display = 'inline'; document.getElementById('1711.04782v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.04782v3-abstract-full" style="display: none;"> A new method to tag the barium daughter in the double beta decay of $^{136}$Xe is reported. Using the technique of single molecule fluorescent imaging (SMFI), individual barium dication (Ba$^{++}$) resolution at a transparent scanning surface has been demonstrated. A single-step photo-bleach confirms the single ion interpretation. Individual ions are localized with super-resolution ($\sim$2~nm), and detected with a statistical significance of 12.9~$蟽$ over backgrounds. This lays the foundation for a new and potentially background-free neutrinoless double beta decay technology, based on SMFI coupled to high pressure xenon gas time projection chambers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.04782v3-abstract-full').style.display = 'none'; document.getElementById('1711.04782v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted by PRL</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 120, 132504 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.05600">arXiv:1710.05600</a> <span> [<a href="https://arxiv.org/pdf/1710.05600">pdf</a>, <a href="https://arxiv.org/format/1710.05600">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2018.07.013">10.1016/j.nima.2018.07.013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Helium-Xenon mixtures to improve topological signature in high pressure gas Xenon TPCs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Felkai%2C+R">R. Felkai</a>, <a href="/search/hep-ex?searchtype=author&query=Monrabal%2C+F">F. Monrabal</a>, <a href="/search/hep-ex?searchtype=author&query=Gonzalez-D%C3%ADaz%2C+D">D. Gonzalez-D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Sorel%2C+M">M. Sorel</a>, <a href="/search/hep-ex?searchtype=author&query=L%C3%B3pez-March%2C+N">N. L贸pez-March</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Adams%2C+C">C. Adams</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Arazi%2C+L">L. Arazi</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a> , et al. (50 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.05600v4-abstract-short" style="display: inline;"> Within the framework of xenon-based double beta decay experiments, we propose the possibility to improve the background rejection of an electroluminescent Time Projection Chamber (EL TPC) by reducing the diffusion of the drifting electrons while keeping nearly intact the energy resolution of a pure xenon EL TPC. Based on state-of-the-art microscopic simulations, a substantial addition of helium, a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.05600v4-abstract-full').style.display = 'inline'; document.getElementById('1710.05600v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.05600v4-abstract-full" style="display: none;"> Within the framework of xenon-based double beta decay experiments, we propose the possibility to improve the background rejection of an electroluminescent Time Projection Chamber (EL TPC) by reducing the diffusion of the drifting electrons while keeping nearly intact the energy resolution of a pure xenon EL TPC. Based on state-of-the-art microscopic simulations, a substantial addition of helium, around 10 or 15~\%, may reduce drastically the transverse diffusion down to 2.5~mm/$\sqrt{\mathrm{m}}$ from the 10.5~mm/$\sqrt{\mathrm{m}}$ of pure xenon. The longitudinal diffusion remains around 4~mm/$\sqrt{\mathrm{m}}$. Light production studies have been performed as well. They show that the relative variation in energy resolution introduced by such a change does not exceed a few percent, which leaves the energy resolution practically unchanged. The technical caveats of using photomultipliers close to an helium atmosphere are also discussed in detail. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.05600v4-abstract-full').style.display = 'none'; document.getElementById('1710.05600v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.06012">arXiv:1706.06012</a> <span> [<a href="https://arxiv.org/pdf/1706.06012">pdf</a>, <a href="https://arxiv.org/ps/1706.06012">ps</a>, <a href="https://arxiv.org/format/1706.06012">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/12/08/T08003">10.1088/1748-0221/12/08/T08003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Radiopurity assessment of the energy readout for the NEXT double beta decay experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=P%C3%A9rez%2C+J">J. P茅rez</a>, <a href="/search/hep-ex?searchtype=author&query=Bandac%2C+I">I. Bandac</a>, <a href="/search/hep-ex?searchtype=author&query=Labarga%2C+L">L. Labarga</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Felkai%2C+R">R. Felkai</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Goldschmidt%2C+A">A. Goldschmidt</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=Gonz%C3%A1lez-D%C3%ADaz%2C+D">D. Gonz谩lez-D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Guti%C3%A9rrez%2C+R+M">R. M. Guti茅rrez</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.06012v2-abstract-short" style="display: inline;"> The Neutrino Experiment with a Xenon Time-Projection Chamber (NEXT) experiment intends to investigate the neutrinoless double beta decay of 136Xe, and therefore requires a severe suppression of potential backgrounds. An extensive material screening and selection process was undertaken to quantify the radioactivity of the materials used in the experiment. Separate energy and tracking readout planes… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.06012v2-abstract-full').style.display = 'inline'; document.getElementById('1706.06012v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.06012v2-abstract-full" style="display: none;"> The Neutrino Experiment with a Xenon Time-Projection Chamber (NEXT) experiment intends to investigate the neutrinoless double beta decay of 136Xe, and therefore requires a severe suppression of potential backgrounds. An extensive material screening and selection process was undertaken to quantify the radioactivity of the materials used in the experiment. Separate energy and tracking readout planes using different sensors allow us to combine the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. The design of radiopure readout planes, in direct contact with the gas detector medium, was especially challenging since the required components typically have activities too large for experiments demanding ultra-low background conditions. After studying the tracking plane, here the radiopurity control of the energy plane is presented, mainly based on gamma-ray spectroscopy using ultra-low background germanium detectors at the Laboratorio Subterr谩neo de Canfranc (Spain). All the available units of the selected model of photomultiplier have been screened together with most of the components for the bases, enclosures and windows. According to these results for the activity of the relevant radioisotopes, the selected components of the energy plane would give a contribution to the overall background level in the region of interest of at most 2.4 x 10-4 counts keV-1 kg-1 y-1, satisfying the sensitivity requirements of the NEXT experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.06012v2-abstract-full').style.display = 'none'; document.getElementById('1706.06012v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Final version for publication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> 2017 JINST 12 T08003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1705.10270">arXiv:1705.10270</a> <span> [<a href="https://arxiv.org/pdf/1705.10270">pdf</a>, <a href="https://arxiv.org/format/1705.10270">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/12/08/P08009">10.1088/1748-0221/12/08/P08009 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Application and performance of an ML-EM algorithm in NEXT </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Sim%C3%B3n%2C+A">A. Sim贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Lerche%2C+C">C. Lerche</a>, <a href="/search/hep-ex?searchtype=author&query=Monrabal%2C+F">F. Monrabal</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G+M">F. I. G. M. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Escada%2C+J">J. Escada</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Felkai%2C+R">R. Felkai</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Goldschmidt%2C+A">A. Goldschmidt</a>, <a href="/search/hep-ex?searchtype=author&query=Gonz%C3%A1lez-D%C3%ADaz%2C+D">D. Gonz谩lez-D铆az</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1705.10270v1-abstract-short" style="display: inline;"> The goal of the NEXT experiment is the observation of neutrinoless double beta decay in $^{136}$Xe using a gaseous xenon TPC with electroluminescent amplification and specialized photodetector arrays for calorimetry and tracking. The NEXT Collaboration is exploring a number of reconstruction algorithms to exploit the full potential of the detector. This paper describes one of them: the Maximum Lik… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.10270v1-abstract-full').style.display = 'inline'; document.getElementById('1705.10270v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1705.10270v1-abstract-full" style="display: none;"> The goal of the NEXT experiment is the observation of neutrinoless double beta decay in $^{136}$Xe using a gaseous xenon TPC with electroluminescent amplification and specialized photodetector arrays for calorimetry and tracking. The NEXT Collaboration is exploring a number of reconstruction algorithms to exploit the full potential of the detector. This paper describes one of them: the Maximum Likelihood Expectation Maximization (ML-EM) method, a generic iterative algorithm to find maximum-likelihood estimates of parameters that has been applied to solve many different types of complex inverse problems. In particular, we discuss a bi-dimensional version of the method in which the photosensor signals integrated over time are used to reconstruct a transverse projection of the event. First results show that, when applied to detector simulation data, the algorithm achieves nearly optimal energy resolution (better than 0.5% FWHM at the Q value of $^{136}$Xe) for events distributed over the full active volume of the TPC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.10270v1-abstract-full').style.display = 'none'; document.getElementById('1705.10270v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 May, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 16 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.06202">arXiv:1609.06202</a> <span> [<a href="https://arxiv.org/pdf/1609.06202">pdf</a>, <a href="https://arxiv.org/format/1609.06202">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/12/01/T01004">10.1088/1748-0221/12/01/T01004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Background rejection in NEXT using deep neural networks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=NEXT+Collaboration"> NEXT Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Renner%2C+J">J. Renner</a>, <a href="/search/hep-ex?searchtype=author&query=Farbin%2C+A">A. Farbin</a>, <a href="/search/hep-ex?searchtype=author&query=Vidal%2C+J+M">J. Mu帽oz Vidal</a>, <a href="/search/hep-ex?searchtype=author&query=Benlloch-Rodr%C3%ADguez%2C+J+M">J. M. Benlloch-Rodr铆guez</a>, <a href="/search/hep-ex?searchtype=author&query=Botas%2C+A">A. Botas</a>, <a href="/search/hep-ex?searchtype=author&query=Ferrario%2C+P">P. Ferrario</a>, <a href="/search/hep-ex?searchtype=author&query=G%C3%B3mez-Cadenas%2C+J+J">J. J. G贸mez-Cadenas</a>, <a href="/search/hep-ex?searchtype=author&query=%C3%81lvarez%2C+V">V. 脕lvarez</a>, <a href="/search/hep-ex?searchtype=author&query=Azevedo%2C+C+D+R">C. D. R. Azevedo</a>, <a href="/search/hep-ex?searchtype=author&query=Borges%2C+F+I+G">F. I. G. Borges</a>, <a href="/search/hep-ex?searchtype=author&query=C%C3%A1rcel%2C+S">S. C谩rcel</a>, <a href="/search/hep-ex?searchtype=author&query=Carri%C3%B3n%2C+J+V">J. V. Carri贸n</a>, <a href="/search/hep-ex?searchtype=author&query=Cebri%C3%A1n%2C+S">S. Cebri谩n</a>, <a href="/search/hep-ex?searchtype=author&query=Cervera%2C+A">A. Cervera</a>, <a href="/search/hep-ex?searchtype=author&query=Conde%2C+C+A+N">C. A. N. Conde</a>, <a href="/search/hep-ex?searchtype=author&query=D%C3%ADaz%2C+J">J. D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Diesburg%2C+M">M. Diesburg</a>, <a href="/search/hep-ex?searchtype=author&query=Esteve%2C+R">R. Esteve</a>, <a href="/search/hep-ex?searchtype=author&query=Fernandes%2C+L+M+P">L. M. P. Fernandes</a>, <a href="/search/hep-ex?searchtype=author&query=Ferreira%2C+A+L">A. L. Ferreira</a>, <a href="/search/hep-ex?searchtype=author&query=Freitas%2C+E+D+C">E. D. C. Freitas</a>, <a href="/search/hep-ex?searchtype=author&query=Goldschmidt%2C+A">A. Goldschmidt</a>, <a href="/search/hep-ex?searchtype=author&query=Gonz%C3%A1lez-D%C3%ADaz%2C+D">D. Gonz谩lez-D铆az</a>, <a href="/search/hep-ex?searchtype=author&query=Guti%C3%A9rrez%2C+R+M">R. M. Guti茅rrez</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1609.06202v3-abstract-short" style="display: inline;"> We investigate the potential of using deep learning techniques to reject background events in searches for neutrinoless double beta decay with high pressure xenon time projection chambers capable of detailed track reconstruction. The differences in the topological signatures of background and signal events can be learned by deep neural networks via training over many thousands of events. These net… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06202v3-abstract-full').style.display = 'inline'; document.getElementById('1609.06202v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.06202v3-abstract-full" style="display: none;"> We investigate the potential of using deep learning techniques to reject background events in searches for neutrinoless double beta decay with high pressure xenon time projection chambers capable of detailed track reconstruction. The differences in the topological signatures of background and signal events can be learned by deep neural networks via training over many thousands of events. These networks can then be used to classify further events as signal or background, providing an additional background rejection factor at an acceptable loss of efficiency. The networks trained in this study performed better than previous methods developed based on the use of the same topological signatures by a factor of 1.2 to 1.6, and there is potential for further improvement. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06202v3-abstract-full').style.display = 'none'; document.getElementById('1609.06202v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 9 figures; formatting changes</span> </p> </li> </ol> <div 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