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NEXT Collaboration(Dey, E. et al), Ayet, A., Byrnes, N., Carcel, S., Kellerer, F., Lopez-March, N., et al. (2025). Ion transport on phased radiofrequency carpets in xenon gas. Eur. Phys. J. C, 85(6), 688–15pp.
Abstract: We present the design and performance of a four-phased radiofrequency (RF) carpet system for ion transport between 200-600 mbar, significantly higher than previously demonstrated RF carpet applications. The RF carpet, designed with a 160 mu\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\upmu $$\end{document}m pitch, is applied to the lateral collection of ions in xenon at pressures up to 600 mbar. We demonstrate transport efficiency of caesium ions across varying pressures, and compare with microscopic simulations made in the SIMION package. The novel use of an N-phased RF carpet can achieve ion levitation and controlled lateral motion in a denser environment than is typical for RF ion transport in gases. This feature makes such carpets strong candidates for ion transport to single ion sensors envisaged for future neutrinoless double-beta decay experiments in xenon gas.
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Roser, J., & Llosa, G. (2025). System modeling and image reconstruction algorithm optimization for a Compton camera for hadron therapy range verification. Eur. Phys. J. Plus, 140(6), 561–6pp.
Abstract: Compton cameras are electronically collimated devices which offer a compact solution for multi-energy gamma-ray imaging. For this reason, such devices are being investigated as potential tools to achieve online range verification in hadron therapy, through the so-called Prompt Gamma imaging technique. However, this application is notably challenging, entailing the need of complex image reconstruction procedures and requiring excellent detector performance in order to achieve sufficient image quality. In this work we recapitulate the steps made in the recent years in system modeling and adaptation of existing image reconstruction algorithms towards the full exploitation of MACACO, a multi-layer Compton telescope under development at the IRIS group of IFIC (Valencia).
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Almanza Soto, M. (2025). Design, prototyping, and test of a Highly Compact and Granular Electromagnetic Calorimeter for the LUXE experiment. Nucl. Instrum. Methods Phys. Res. A, 1080, 170679–6pp.
Abstract: The LUXE experiment will investigate the strong-field QED regime by using the interactions of high-energy electrons from the European XFEL in a powerful laser field. It will measure the production of electron-positron pairs as a function of the laser field strength, up to the non-perturbative non-linear regime. LUXE foresees a positron detection system consisting of a tracker and a granular and unprecedentedly compact silicon-tungsten electromagnetic sandwich calorimeter (ECAL-P). The ECAL-P has been designed to cope with the wide range of the expected number of positrons per bunch crossing. In addition, the energy distribution of the positrons has to be measured on top of a widely spread low-energy background. The ECAL-P is composed of tungsten absorber plates interspersed with thin sensor planes, consisting of silicon pad sensors, flexible Kapton printed circuit planes, and carbon fiber support. The sensor planes are less than 1 mm thick and will be read using dedicated front-end ASICs in 130 nm technology (FLAXE) and FPGAs for data pre-processing. GaAs sensor planes with integrated readout strips are also being considered as an alternative to silicon. Prototypes of individual sensor planes have been tested in a 5 GeV electron beam. A full compact calorimeter tower of up to 90 x 90 x 600 mm3 (15 X0) will be produced and tested in an electron beam. The design challenges, sensor characterization, prototyping, integration, commissioning, and the available results from a beam test in 2022 are discussed.
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Mandic, I. et aI., Soldevila, U., Lacasta, C., Solaz, C., & Bernabeu, J. (2025). Unusual annealing of charge collection efficiency of silicon strip detectors, ATLAS18, irradiated to high fluences with 23 GeV protons. Nucl. Instrum. Methods Phys. Res. A, 1080, 170682–4pp.
Abstract: Extensive studies were performed on highly irradiated ATLAS18 mini strip detectors to evaluate their annealing behaviour. Collected charge was measured after several steps of annealing at 60 degrees C. For detectors irradiated with neutrons or low energy protons the collected charge exhibited a beneficial effect of short-term annealing which was followed by a decrease in charge collection efficiency at longer annealing times. After irradiation with 23 GeV protons to fluences above Phi(eq) similar to 1.2 . 10(15) cm(-2), the collected charge remained unchanged or decreased after the first few tens of minutes of annealing. Edge-TCT measurements indicated that this unusual annealing behaviour is related to the double-peak electric field profile in the detector. Mixed irradiation with 23 GeV protons and neutrons to fluences matching the expected in the upgraded ATLAS experiment showed this unusual annealing effect will not impact the operation of the ITk strip detector.
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IDS collaboration(Llanos-Exposito, M. et al), Algora, A., & Nacher, E. (2025). Structure of 128Sn selectively populated in the β decay of the 128In ground state. Phys. Rev. C, 111(6), 064310–13pp.
Abstract: High-resolution gamma-ray spectroscopy and fast-timing methods were employed to study the excited structure of 128Sn, populated via the beta-decay chain of 128Cd -> 128In -> 128Sn. The experiment was performed by online mass separation at the ISOLDE facility at CERN, profiting from intense and pure Cd beams obtained by a temperature-controlled quartz transfer line combined with resonant laser ionization. An extended 128Sn level scheme populated in the beta – decay of the low-spin 128In isomer was constructed, adding a total of 81 new gamma-ray transitions and 30 new levels. Lifetimes of excited states were measured using time-delayed beta gamma (t) and gamma gamma (t) coincidences. The lifetime of the (4+) state was measured for the first time, making it possible to deduce the B(E 2; 4+ -> 2+) transition strength. The previously measured (5-) state was reassessed with improved statistics. Additionally, an upper limit for the lifetime of the state at 2378 keV was established. The derived reduced transition probabilities support a tentative spin-parity assignment of (4-) for this level. The experimental level scheme and transition probabilities are compared with available shell-model calculations.
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