J. Haefner

Proton 3D dose measurement with a multi-layer strip ionization chamber (MLSIC) device

Shuang Zhou, Qinghao Chen, J. Haefner, Winter Smith et autres

Abstract Objective. In current clinical practice for quality assurance (QA), intensity modulated proton therapy (IMPT) fields are verified by measuring planar dose distributions at one or a few selected depths in a phantom. A QA device that measures full 3D dose distributions …

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Millimeter wave‐based patient setup verification and motion tracking during radiotherapy

Max Bressler, Jingxuan Zhu, Joshua Olick‐Gibson, J. Haefner et autres

BACKGROUND: Position verification and motion monitoring are critical for safe and precise radiotherapy (RT). Existing approaches to these tasks based on visible light or x-ray are suboptimal either because they cannot penetrate obstructions to the patient's skin or introduce additional radiation exposure. …

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Dosimetric evaluation of dose shaping by adaptive aperture and its impact on plan quality

Aaron Silvus, J. Haefner, Michael B. Altman, Tianyu Zhao et autres

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Simulation study of a novel small animal FLASH irradiator (SAFI) with integrated inverse-geometry CT based on circularly distributed kV X-ray sources

Yuewen Tan, Shuang Zhou, J. Haefner, Qinghao Chen et autres

Abstract Ultra-high dose rate (UHDR) radiotherapy (RT) or FLASH-RT can potentially reduce normal tissue toxicity. A small animal irradiator that can deliver FLASH-RT treatments similar to clinical RT treatments is needed for pre-clinical studies of FLASH-RT. We designed and simulated a novel …

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Demonstration of Event Position Reconstruction based on Diffusion in the NEXT-White Detector

J. Haefner, K. E. Navarro, R. Guénette, B. J. P. Jones et autres

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 …

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Demonstration of neutrinoless double beta decay searches in gaseous xenon with NEXT

P. Novella, M. Sorel, A. Usón, C. Adams et autres

Abstract The NEXT experiment aims at the sensitive search of the neutrinoless double beta decay in 136Xe, using high-pressure gas electroluminescent time projection chambers. The NEXT-White detector is the first radiopure demonstrator of this technology, operated in the Laboratorio Subterráneo de Canfranc. …

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Ba+2 ion trapping using organic submonolayer for ultra-low background neutrinoless double beta detector

P. Herrero-Gómez, Jan Patrick Calupitan, M. Ilyn, Alejandro Berdonces‐Layunta et autres

If neutrinos are their own antiparticles the otherwise-forbidden nuclear reaction known as neutrinoless double beta decay can occur. The very long lifetime expected for these exceptional events makes its detection a daunting task. In order to conduct an almost background-free experiment, the …

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Neutral Bremsstrahlung Emission in Xenon Unveiled

C. A. O. Henriques, P. Amedo, J. M. R. Teixeira, D. González-Díaz et autres

We present evidence of non-excimer-based secondary scintillation in gaseous xenon, obtained using both the NEXT-White time projection chamber (TPC) and a dedicated setup.Detailed comparison with first-principle calculations allows us to assign this scintillation mechanism to neutral bremsstrahlung (NBrS), a process that is …

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

C. Adams, V. Álvarez, L. Arazi, I. J. Arnquist et autres

A bstract The Neutrino Experiment with a Xenon TPC (NEXT) searches for the neutrinoless double-beta (0 νββ ) decay of 136 Xe using high-pressure xenon gas TPCs with electroluminescent amplification. A scaled-up version of this technology with about 1 tonne of enriched …

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

A. Simón, Y. Ifergan, A. B. Redwine, R. Weiss-Babai et autres

Abstract Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ∼ 1027yr, 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 …

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Radio frequency and DC high voltage breakdown of high pressure helium, argon, and xenon

K. Woodruff, Jacqueline Baeza-Rubio, D. Huerta, B. J. P. Jones et autres

Motivated by the possibility of guiding daughter ions from double beta decay events to single-ion sensors for barium tagging, the NEXT collaboration is developing a program of R&D to test radio frequency (RF) carpets for ion transport in high pressure xenon gas. …

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Demonstration of background rejection using deep convolutional neural networks in the NEXT experiment

M. Kekic, C. Adams, K. Woodruff, J. Renner et autres

Abstract 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 …

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