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<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/2409.01058">arXiv:2409.01058</a> <span> [<a href="https://arxiv.org/pdf/2409.01058">pdf</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="Atomic Physics">physics.atom-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/10.1063/5.0196806">10.1063/5.0196806 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> TALOS (Total Automation of LabVIEW Operations for Science): A framework for autonomous control systems for complex experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Volponi%2C+M">M. Volponi</a>, <a href="/search/physics?searchtype=author&query=Zieli%C5%84ski%2C+J">J. Zieli艅ski</a>, <a href="/search/physics?searchtype=author&query=Rauschendorfer%2C+T">T. Rauschendorfer</a>, <a href="/search/physics?searchtype=author&query=Huck%2C+S">S. Huck</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Auzins%2C+M">M. Auzins</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+B">B. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Burian%2C+P">P. Burian</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Ciury%C5%82o%2C+R">R. Ciury艂o</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Eliaszuk%2C+K">K. Eliaszuk</a>, <a href="/search/physics?searchtype=author&query=Giszczak%2C+A">A. Giszczak</a>, <a href="/search/physics?searchtype=author&query=Gl%C3%B6ggler%2C+L+T">L. T. Gl枚ggler</a>, <a href="/search/physics?searchtype=author&query=Graczykowski%2C+%C5%81">艁. Graczykowski</a>, <a href="/search/physics?searchtype=author&query=Grosbart%2C+M">M. Grosbart</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Gusakova%2C+N">N. Gusakova</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F">F. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">S. Haider</a>, <a href="/search/physics?searchtype=author&query=Janik%2C+M+A">M. A. Janik</a> , et al. (30 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="2409.01058v1-abstract-short" style="display: inline;"> Modern physics experiments are frequently very complex, relying on multiple simultaneous events to happen in order to obtain the desired result. The experiment control system plays a central role in orchestrating the measurement setup: However, its development is often treated as secondary with respect to the hardware, its importance becoming evident only during the operational phase. Therefore, t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.01058v1-abstract-full').style.display = 'inline'; document.getElementById('2409.01058v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.01058v1-abstract-full" style="display: none;"> Modern physics experiments are frequently very complex, relying on multiple simultaneous events to happen in order to obtain the desired result. The experiment control system plays a central role in orchestrating the measurement setup: However, its development is often treated as secondary with respect to the hardware, its importance becoming evident only during the operational phase. Therefore, the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) collaboration has created a framework for easily coding control systems, specifically targeting atomic, quantum, and antimatter experiments. This framework, called Total Automation of LabVIEW Operations for Science (TALOS), unifies all the machines of the experiment in a single entity, thus enabling complex high-level decisions to be taken, and it is constituted by separate modules, called MicroServices, that run concurrently and asynchronously. This enhances the stability and reproducibility of the system while allowing for continuous integration and testing while the control system is running. The system demonstrated high stability and reproducibility, running completely unsupervised during the night and weekends of the data-taking campaigns. The results demonstrate the suitability of TALOS to manage an entire physics experiment in full autonomy: being open-source, experiments other than the AEgIS experiment can benefit from it. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.01058v1-abstract-full').style.display = 'none'; document.getElementById('2409.01058v1-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Rev. Sci. Instrum. 95, 085116 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.16044">arXiv:2406.16044</a> <span> [<a href="https://arxiv.org/pdf/2406.16044">pdf</a>, <a href="https://arxiv.org/format/2406.16044">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> </div> </div> <p class="title is-5 mathjax"> Real-time antiproton annihilation vertexing with sub-micron resolution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Berghold%2C+M">M. Berghold</a>, <a href="/search/physics?searchtype=author&query=Orsucci%2C+D">D. Orsucci</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Alfaro%2C+S">S. Alfaro</a>, <a href="/search/physics?searchtype=author&query=Auzins%2C+M">M. Auzins</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+B">B. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Burian%2C+P">P. Burian</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Ciury%C5%82o%2C+R">R. Ciury艂o</a>, <a href="/search/physics?searchtype=author&query=Chehaimi%2C+A">A. Chehaimi</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Eliaszuk%2C+K">K. Eliaszuk</a>, <a href="/search/physics?searchtype=author&query=Ferguson%2C+R">R. Ferguson</a>, <a href="/search/physics?searchtype=author&query=Germann%2C+M">M. Germann</a>, <a href="/search/physics?searchtype=author&query=Giszczak%2C+A">A. Giszczak</a>, <a href="/search/physics?searchtype=author&query=Gl%C3%B6ggler%2C+L+T">L. T. Gl枚ggler</a>, <a href="/search/physics?searchtype=author&query=Graczykowski%2C+%C5%81">艁. Graczykowski</a>, <a href="/search/physics?searchtype=author&query=Grosbart%2C+M">M. Grosbart</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Gusakova%2C+N">N. Gusakova</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="2406.16044v1-abstract-short" style="display: inline;"> The primary goal of the AEgIS experiment is to precisely measure the free fall of antihydrogen within Earth's gravitational field. To this end, a cold ~50K antihydrogen beam has to pass through two grids forming a moir茅 deflectometer before annihilating onto a position-sensitive detector, which shall determine the vertical position of the annihilation vertex relative to the grids with micrometric… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.16044v1-abstract-full').style.display = 'inline'; document.getElementById('2406.16044v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.16044v1-abstract-full" style="display: none;"> The primary goal of the AEgIS experiment is to precisely measure the free fall of antihydrogen within Earth's gravitational field. To this end, a cold ~50K antihydrogen beam has to pass through two grids forming a moir茅 deflectometer before annihilating onto a position-sensitive detector, which shall determine the vertical position of the annihilation vertex relative to the grids with micrometric accuracy. Here we introduce a vertexing detector based on a modified mobile camera sensor and experimentally demonstrate that it can measure the position of antiproton annihilations with an accuracy of $0.62^{+0.40}_{-0.22}渭m$, which represents a 35-fold improvement over the previous state-of-the-art for real-time antiproton vertexing. Importantly, these antiproton detection methods are directly applicable to antihydrogen. Moreover, the sensitivity to light of the sensor enables the in-situ calibration of the moir茅 deflectometer, significantly reducing systematic errors. This sensor emerges as a breakthrough technology for achieving the \aegis scientific goals and has been selected as the basis for the development of a large-area detector for conducting antihydrogen gravity measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.16044v1-abstract-full').style.display = 'none'; document.getElementById('2406.16044v1-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> 23 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </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, 4 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.04637">arXiv:2402.04637</a> <span> [<a href="https://arxiv.org/pdf/2402.04637">pdf</a>, <a href="https://arxiv.org/format/2402.04637">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</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/10.1140/epjqt/s40507-024-00220-6">10.1140/epjqt/s40507-024-00220-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> CIRCUS: an autonomous control system for antimatter, atomic and quantum physics experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Volponi%2C+M">Marco Volponi</a>, <a href="/search/physics?searchtype=author&query=Huck%2C+S">Saiva Huck</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">Ruggero Caravita</a>, <a href="/search/physics?searchtype=author&query=Zielinski%2C+J">Jakub Zielinski</a>, <a href="/search/physics?searchtype=author&query=Kornakov%2C+G">Georgy Kornakov</a>, <a href="/search/physics?searchtype=author&query=Kasprowicz%2C+G">Grzegorz Kasprowicz</a>, <a href="/search/physics?searchtype=author&query=Nowicka%2C+D">Dorota Nowicka</a>, <a href="/search/physics?searchtype=author&query=Rauschendorfer%2C+T">Tassilo Rauschendorfer</a>, <a href="/search/physics?searchtype=author&query=Rien%C3%A4cker%2C+B">Benjamin Rien盲cker</a>, <a href="/search/physics?searchtype=author&query=Prelz%2C+F">Francesco Prelz</a>, <a href="/search/physics?searchtype=author&query=Auzins%2C+M">Marcis Auzins</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+B">Benedikt Bergmann</a>, <a href="/search/physics?searchtype=author&query=Burian%2C+P">Petr Burian</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">Roberto Sennen Brusa</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">Antoine Camper</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">Fabrizio Castelli</a>, <a href="/search/physics?searchtype=author&query=Ciury%C5%82o%2C+R">Roman Ciury艂o</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">Giovanni Consolati</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">Michael Doser</a>, <a href="/search/physics?searchtype=author&query=Gl%C3%B6ggler%2C+L">Lisa Gl枚ggler</a>, <a href="/search/physics?searchtype=author&query=Graczykowski%2C+%C5%81">艁ukasz Graczykowski</a>, <a href="/search/physics?searchtype=author&query=Grosbart%2C+M">Malgorzata Grosbart</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">Francesco Guatieri</a>, <a href="/search/physics?searchtype=author&query=Gusakova%2C+N">Nataly Gusakova</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F">Fredrik Gustafsson</a> , et al. (27 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="2402.04637v1-abstract-short" style="display: inline;"> A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management of a multitude of different devices and their precise time synchronisation. The AEgIS collaboration presents CIRCUS, a novel, autonomous control system optimised for time-critical experiments such as those at CERN's Antiproton Decelerator and, more broad… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.04637v1-abstract-full').style.display = 'inline'; document.getElementById('2402.04637v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.04637v1-abstract-full" style="display: none;"> A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management of a multitude of different devices and their precise time synchronisation. The AEgIS collaboration presents CIRCUS, a novel, autonomous control system optimised for time-critical experiments such as those at CERN's Antiproton Decelerator and, more broadly, in atomic and quantum physics research. Its setup is based on Sinara/ARTIQ and TALOS, integrating the ALPACA analysis pipeline, the last two developed entirely in AEgIS. It is suitable for strict synchronicity requirements and repeatable, automated operation of experiments, culminating in autonomous parameter optimisation via feedback from real-time data analysis. CIRCUS has been successfully deployed and tested in AEgIS; being experiment-agnostic and released open-source, other experiments can leverage its capabilities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.04637v1-abstract-full').style.display = 'none'; document.getElementById('2402.04637v1-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> 7 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.08760">arXiv:2310.08760</a> <span> [<a href="https://arxiv.org/pdf/2310.08760">pdf</a>, <a href="https://arxiv.org/format/2310.08760">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gl%C3%B6ggler%2C+L+T">L. T. Gl枚ggler</a>, <a href="/search/physics?searchtype=author&query=Gusakova%2C+N">N. Gusakova</a>, <a href="/search/physics?searchtype=author&query=Rien%C3%A4cker%2C+B">B. Rien盲cker</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Huck%2C+S">S. Huck</a>, <a href="/search/physics?searchtype=author&query=Volponi%2C+M">M. Volponi</a>, <a href="/search/physics?searchtype=author&query=Wolz%2C+T">T. Wolz</a>, <a href="/search/physics?searchtype=author&query=Penasa%2C+L">L. Penasa</a>, <a href="/search/physics?searchtype=author&query=Krumins%2C+V">V. Krumins</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F">F. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Auzins%2C+M">M. Auzins</a>, <a href="/search/physics?searchtype=author&query=Bergmann%2C+B">B. Bergmann</a>, <a href="/search/physics?searchtype=author&query=Burian%2C+P">P. Burian</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Ciury%C5%82o%2C+R">R. Ciury艂o</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Graczykowski%2C+%C5%81">艁. Graczykowski</a>, <a href="/search/physics?searchtype=author&query=Grosbart%2C+M">M. Grosbart</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">S. Haider</a>, <a href="/search/physics?searchtype=author&query=Janik%2C+M+A">M. A. Janik</a> , et al. (27 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="2310.08760v1-abstract-short" style="display: inline;"> We report on laser cooling of a large fraction of positronium (Ps) in free-flight by strongly saturating the $1^3S$-$2^3P$ transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground stat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.08760v1-abstract-full').style.display = 'inline'; document.getElementById('2310.08760v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.08760v1-abstract-full" style="display: none;"> We report on laser cooling of a large fraction of positronium (Ps) in free-flight by strongly saturating the $1^3S$-$2^3P$ transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-lived $3^3P$ states. The second effect is the one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) K to 170(20) K. We demonstrate a 58(9) % increase in the coldest fraction of the Ps ensemble. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.08760v1-abstract-full').style.display = 'none'; document.getElementById('2310.08760v1-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> 12 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">6 pages, 5 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/2306.14733">arXiv:2306.14733</a> <span> [<a href="https://arxiv.org/pdf/2306.14733">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Classical Physics">physics.class-ph</span> </div> </div> <p class="title is-5 mathjax"> Temperature Dependent Failure of Atomically Thin MoTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Haider%2C+A+S+M+R">A S M Redwan Haider</a>, <a href="/search/physics?searchtype=author&query=Hezam%2C+A+F+A+M">Ahmad Fatehi Ali Mohammed Hezam</a>, <a href="/search/physics?searchtype=author&query=Islam%2C+M+A">Md Akibul Islam</a>, <a href="/search/physics?searchtype=author&query=Arafat%2C+Y">Yeasir Arafat</a>, <a href="/search/physics?searchtype=author&query=Ferdaous%2C+M+T">Mohammad Tanvirul Ferdaous</a>, <a href="/search/physics?searchtype=author&query=Salehin%2C+S">Sayedus Salehin</a>, <a href="/search/physics?searchtype=author&query=Karim%2C+M+R">Md. Rezwanul Karim</a> </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="2306.14733v3-abstract-short" style="display: inline;"> In this study, we systematically investigated the mechanical responses of monolayer molybdenum ditelluride (MoTe2) using molecular dynamics (MD) simulations. The tensile behavior of trigonal prismatic phase (2H phase) MoTe2 under uniaxial strain was simulated in the armchair and zigzag directions. We also investigated the crack formation and propagation in both armchair and zigzag directions at 10… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.14733v3-abstract-full').style.display = 'inline'; document.getElementById('2306.14733v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.14733v3-abstract-full" style="display: none;"> In this study, we systematically investigated the mechanical responses of monolayer molybdenum ditelluride (MoTe2) using molecular dynamics (MD) simulations. The tensile behavior of trigonal prismatic phase (2H phase) MoTe2 under uniaxial strain was simulated in the armchair and zigzag directions. We also investigated the crack formation and propagation in both armchair and zigzag directions at 10K and 300K to understand the fracture behavior of monolayer MoTe2 at different temperatures. The MD simulations show clean cleavage for the armchair direction, and the cracks were numerous and scattered in the case of the zigzag direction. Finally, we investigated the effect of temperature on Young's modulus and fracture stress of monolayer MoTe2. The results show that at a strain rate of 10^-4 ps^-1, the fracture strength of monolayer MoTe2 in the armchair and zigzag directions at 10K is 16.33 GPa (11.43 N/m) and 13.71 GPa (9.46 N/m) under a 24% and 18% fracture strain, respectively. The fracture strength of monolayer MoTe2 in the armchair and zigzag direction at 600K is 10.81 GPa (7.56 N/m) and 10.13 GPa (7.09 N/m) under a 12.5% and 12.47% fracture strain, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.14733v3-abstract-full').style.display = 'none'; document.getElementById('2306.14733v3-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">22 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/2203.03055">arXiv:2203.03055</a> <span> [<a href="https://arxiv.org/pdf/2203.03055">pdf</a>, <a href="https://arxiv.org/format/2203.03055">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="Atomic Physics">physics.atom-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/10.1016/j.nima.2020.163637">10.1016/j.nima.2020.163637 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A cryogenic tracking detector for antihydrogen detection in the AEgIS experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amsler%2C+C">C. Amsler</a>, <a href="/search/physics?searchtype=author&query=Antonello%2C+M">M. Antonello</a>, <a href="/search/physics?searchtype=author&query=Belov%2C+A">A. Belov</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Caccia%2C+M">M. Caccia</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Demetrio%2C+A">A. Demetrio</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Ekman%2C+P+A">P. A. Ekman</a>, <a href="/search/physics?searchtype=author&query=Fani%2C+M">M. Fani</a>, <a href="/search/physics?searchtype=author&query=Ferragut%2C+R">R. Ferragut</a>, <a href="/search/physics?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/physics?searchtype=author&query=Giammarchi%2C+M">M. Giammarchi</a>, <a href="/search/physics?searchtype=author&query=Gligorova%2C+A">A. Gligorova</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Hackstock%2C+P">P. Hackstock</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+D">D. Haider</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">S. Haider</a>, <a href="/search/physics?searchtype=author&query=Hinterberger%2C+A">A. Hinterberger</a> , et al. (33 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="2203.03055v1-abstract-short" style="display: inline;"> We present the commissioning of the Fast Annihilation Cryogenic Tracker detector (FACT), installed around the antihydrogen production trap inside the 1 T superconducting magnet of the AEgIS experiment. FACT is designed to detect pions originating from the annihilation of antiprotons. Its 794 scintillating fibers operate at 4 K and are read out by silicon photomultipliers (MPPCs) at near room tempe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.03055v1-abstract-full').style.display = 'inline'; document.getElementById('2203.03055v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.03055v1-abstract-full" style="display: none;"> We present the commissioning of the Fast Annihilation Cryogenic Tracker detector (FACT), installed around the antihydrogen production trap inside the 1 T superconducting magnet of the AEgIS experiment. FACT is designed to detect pions originating from the annihilation of antiprotons. Its 794 scintillating fibers operate at 4 K and are read out by silicon photomultipliers (MPPCs) at near room temperature. FACT provides the antiproton/antihydrogen annihilation position information with a few ns timing resolution. We present the hardware and software developments which led to the successful operation of the detector for antihydrogen detection and the results of an antiproton-loss based efficiency assessment. The main background to the antihydrogen signal is that of the positrons impinging onto the positronium conversion target and creating a large amount of gamma rays which produce a sizeable signal in the MPPCs shortly before the antihydrogen signal is expected. We detail the characterization of this background signal and its impact on the antihydrogen detection efficiency. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.03055v1-abstract-full').style.display = 'none'; document.getElementById('2203.03055v1-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 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> NIM A, Volume 960, 21 April 2020, 163637 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.09957">arXiv:2006.09957</a> <span> [<a href="https://arxiv.org/pdf/2006.09957">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-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/10.1016/j.biombioe.2020.105658">10.1016/j.biombioe.2020.105658 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Two-stage catalytic hydrotreatment of highly nitrogenous biocrude from continuous hydrothermal liquefaction: A rational design of the stabilization stage </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Haider%2C+M+S">Muhammad Salman Haider</a>, <a href="/search/physics?searchtype=author&query=Castello%2C+D">Daniele Castello</a>, <a href="/search/physics?searchtype=author&query=Rosendahl%2C+L+A">Lasse Aistrup Rosendahl</a> </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="2006.09957v2-abstract-short" style="display: inline;"> Effective catalytic hydrotreatment of highly nitrogenous biocrudes derived from the hydrothermal liquefaction (HTL) of primary sewage sludge and microalga Spirulina biomass was explored. A critical issue is the lack of thermal stability of raw HTL biocrudes at the severe conditions (~400 掳C) required for hydrodenitrogenation. This fact suggests the need for a two-stage approach, involving a first… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.09957v2-abstract-full').style.display = 'inline'; document.getElementById('2006.09957v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.09957v2-abstract-full" style="display: none;"> Effective catalytic hydrotreatment of highly nitrogenous biocrudes derived from the hydrothermal liquefaction (HTL) of primary sewage sludge and microalga Spirulina biomass was explored. A critical issue is the lack of thermal stability of raw HTL biocrudes at the severe conditions (~400 掳C) required for hydrodenitrogenation. This fact suggests the need for a two-stage approach, involving a first low-temperature stabilization stage followed by another one operated at higher temperature. In this study, DSC was successfully used to indicate the thermal stability of both biocrudes. During hydrotreating, it was observed that complete deoxygenation was already achieved in the first stage at 350 掳C, with limited coke formation. Moreover, after second stage up to 92% denitrogenation associated with the higher hydrogen consumption (39.9 g kg -1 for Spirulina and 36.9 g kg -1 for sewage sludge) was obtained for both biocrudes. Consequently, comparable oil yields but significantly less coke yields were recorded during two stage upgrading (1.0% for Spirulina and 0.7% for sewage sludge), compared to direct processing at 400 掳C (9.1% for Spirulina and 3.4% for sewage sludge). In addition, the properties of the upgraded oils were enhanced by increasing the temperature in the first stage (310 掳C, 330 掳C and 350 掳C respectively). Finally, the results indicated that remarkable drop in fuel properties were obtained, with respect to heteroatom (O and N) removal, HHV, and H/C ratio during the two stage hydrotreatment. Two-stage hydrotreating is therefore proposed as a successful approach for the upgrading of HTL biocrudes with high nitrogen content. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.09957v2-abstract-full').style.display = 'none'; document.getElementById('2006.09957v2-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> 24 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 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">Accepted manuscript. Published in Biomass & Bioenergy (Elsevier)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Biomass and Bioenergy 139 (2020), 105658 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.04342">arXiv:1911.04342</a> <span> [<a href="https://arxiv.org/pdf/1911.04342">pdf</a>, <a href="https://arxiv.org/format/1911.04342">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-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/10.1103/PhysRevA.102.013101">10.1103/PhysRevA.102.013101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Rydberg-positronium velocity and self-ionization studies in 1T magnetic field and cryogenic environment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Antonello%2C+M">M. Antonello</a>, <a href="/search/physics?searchtype=author&query=Belov%2C+A">A. Belov</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+G+B+R+S">G. Bonomi R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Caccia%2C+M">M. Caccia</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Fani%2C+M">M. Fani</a>, <a href="/search/physics?searchtype=author&query=Ferragut%2C+R">R. Ferragut</a>, <a href="/search/physics?searchtype=author&query=Fesel%2C+J">J. Fesel</a>, <a href="/search/physics?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/physics?searchtype=author&query=Gligorova%2C+A">A. Gligorova</a>, <a href="/search/physics?searchtype=author&query=Gl%C3%B6ggler%2C+L+T">L. T. Gl枚ggler</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">S. Haider</a>, <a href="/search/physics?searchtype=author&query=Hinterberger%2C+A">A. Hinterberger</a>, <a href="/search/physics?searchtype=author&query=Khalidova%2C+O">O. Khalidova</a>, <a href="/search/physics?searchtype=author&query=Krasnicky%2C+D">D. Krasnicky</a>, <a href="/search/physics?searchtype=author&query=Lagomarsino%2C+V">V. Lagomarsino</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Mariazzi%2C+S">S. Mariazzi</a> , et al. (21 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="1911.04342v5-abstract-short" style="display: inline;"> We characterized the pulsed Rydberg-positronium production inside the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on positronium along two axes in a cryogenic environment (10K) and in 1T magnetic field were pe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.04342v5-abstract-full').style.display = 'inline'; document.getElementById('1911.04342v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.04342v5-abstract-full" style="display: none;"> We characterized the pulsed Rydberg-positronium production inside the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on positronium along two axes in a cryogenic environment (10K) and in 1T magnetic field were performed. The velocimetry was done by MCP-imaging of photoionized positronium previously excited to the $n=3$ state. One direction of velocity was measured via Doppler-scan of this $n=3$-line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number $n_{eff}$ ranging between 14 and 22. We conclude with a discussion about the optimization of our experimental parameters for creating Rydberg-positronium in preparation for an efficient pulsed production of antihydrogen. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.04342v5-abstract-full').style.display = 'none'; document.getElementById('1911.04342v5-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 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 102, 013101 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.09004">arXiv:1904.09004</a> <span> [<a href="https://arxiv.org/pdf/1904.09004">pdf</a>, <a href="https://arxiv.org/format/1904.09004">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</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/10.1103/PhysRevA.100.063414">10.1103/PhysRevA.100.063414 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Efficient $2^3S$ positronium production by stimulated decay from the $3^3P$ level </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Antonello%2C+M">M. Antonello</a>, <a href="/search/physics?searchtype=author&query=Belov%2C+A">A. Belov</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Caccia%2C+M">M. Caccia</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Demetrio%2C+A">A. Demetrio</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Fan%C3%AC%2C+M">M. Fan矛</a>, <a href="/search/physics?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/physics?searchtype=author&query=Gligorova%2C+A">A. Gligorova</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Hackstock%2C+P">P. Hackstock</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">S. Haider</a>, <a href="/search/physics?searchtype=author&query=Hinterberger%2C+A">A. Hinterberger</a>, <a href="/search/physics?searchtype=author&query=Kellerbauer%2C+A">A. Kellerbauer</a>, <a href="/search/physics?searchtype=author&query=Khalidova%2C+O">O. Khalidova</a>, <a href="/search/physics?searchtype=author&query=Krasnicky%2C+D">D. Krasnicky</a>, <a href="/search/physics?searchtype=author&query=Lagomarsino%2C+V">V. Lagomarsino</a> , et al. (26 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="1904.09004v1-abstract-short" style="display: inline;"> We investigate experimentally the possibility of enhancing the production of $2^3S$ positronium atoms by driving the $1^3S$-$3^3P$ and $3^3P$-$2^3S$ transitions, overcoming the natural branching ratio limitation of spontaneous decay from $3^3P$ to $2^3S$. The decay of $3^3P$ positronium atoms towards the $2^3S$ level has been effciently stimulated by a 1312.2nm broadband IR laser pulse. The depend… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.09004v1-abstract-full').style.display = 'inline'; document.getElementById('1904.09004v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.09004v1-abstract-full" style="display: none;"> We investigate experimentally the possibility of enhancing the production of $2^3S$ positronium atoms by driving the $1^3S$-$3^3P$ and $3^3P$-$2^3S$ transitions, overcoming the natural branching ratio limitation of spontaneous decay from $3^3P$ to $2^3S$. The decay of $3^3P$ positronium atoms towards the $2^3S$ level has been effciently stimulated by a 1312.2nm broadband IR laser pulse. The dependence of the stimulating transition efficiency on the intensity of the IR pulse has been measured to find the optimal enhancement conditions. A maximum relative increase of $ \times (3.1 \pm 1.0) $ in the $2^3S$ production efficiency, with respect to the case where only spontaneous decay is present, was obtained. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.09004v1-abstract-full').style.display = 'none'; document.getElementById('1904.09004v1-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 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">6 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 100, 063414 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.04629">arXiv:1904.04629</a> <span> [<a href="https://arxiv.org/pdf/1904.04629">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1016/j.renene.2019.04.003">10.1016/j.renene.2019.04.003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Catalytic upgrading of hydrothermal liquefaction biocrudes: Different challenges for different feedstocks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Castello%2C+D">Daniele Castello</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+M+S">Muhammad Salman Haider</a>, <a href="/search/physics?searchtype=author&query=Rosendahl%2C+L+A">Lasse Aistrup Rosendahl</a> </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="1904.04629v2-abstract-short" style="display: inline;"> Hydrothermal liquefaction (HTL) followed by catalytic hydrotreating of the produced biocrude is increasingly gaining ground as an effective technology for the conversion of biomass into liquid biofuels. A strong advantage of HTL resides in its great flexibility towards the feedstock, since it is able to treat a large number of different organic substrates, ranging from dry to wet residual biomass.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.04629v2-abstract-full').style.display = 'inline'; document.getElementById('1904.04629v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.04629v2-abstract-full" style="display: none;"> Hydrothermal liquefaction (HTL) followed by catalytic hydrotreating of the produced biocrude is increasingly gaining ground as an effective technology for the conversion of biomass into liquid biofuels. A strong advantage of HTL resides in its great flexibility towards the feedstock, since it is able to treat a large number of different organic substrates, ranging from dry to wet residual biomass. Nevertheless, the characteristics of biocrudes from different typologies of organic materials result in different challenges to be met during the hydrotreating step, leading to differences in heteroatoms removal and in the typology and composition of the targeted products. In this work, biocrudes were catalytically hydrotreated with a commercial NiMo/Al2O3 catalyst at different temperatures and pressures. Sewage sludge biocrude was found to be very promising for the production of straight-chain hydrocarbons in the diesel range, with considerable heteroatoms removal even at mild hydrotreating conditions. Similar results were shown by algal biocrude, although complete denitrogenation is challenging. Upgraded biocrudes from lignocellulosic feedstock (miscanthus) showed high yields in the gasoline range, with a remarkable content of aromatics. Operating at a higher H2 pressure was found to be crucial to prevent coking and decarboxylation reactions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.04629v2-abstract-full').style.display = 'none'; document.getElementById('1904.04629v2-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 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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 manuscript for publication in Renewable Energy</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Renewable Energy (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.01808">arXiv:1808.01808</a> <span> [<a href="https://arxiv.org/pdf/1808.01808">pdf</a>, <a href="https://arxiv.org/format/1808.01808">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-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/10.1103/PhysRevA.99.033405">10.1103/PhysRevA.99.033405 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Velocity selected production of $2^3S$ metastable positronium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amsler%2C+C">C. Amsler</a>, <a href="/search/physics?searchtype=author&query=Antonello%2C+M">M. Antonello</a>, <a href="/search/physics?searchtype=author&query=Belov%2C+A">A. Belov</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Caccia%2C+M">M. Caccia</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Demetrio%2C+A">A. Demetrio</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Fan%C3%AC%2C+M">M. Fan矛</a>, <a href="/search/physics?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/physics?searchtype=author&query=Gligorova%2C+A">A. Gligorova</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a>, <a href="/search/physics?searchtype=author&query=Hackstock%2C+P">P. Hackstock</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">S. Haider</a>, <a href="/search/physics?searchtype=author&query=Hinterberger%2C+A">A. Hinterberger</a>, <a href="/search/physics?searchtype=author&query=Holmestad%2C+H">H. Holmestad</a>, <a href="/search/physics?searchtype=author&query=Kellerbauer%2C+A">A. Kellerbauer</a>, <a href="/search/physics?searchtype=author&query=Khalidova%2C+O">O. Khalidova</a> , et al. (30 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="1808.01808v2-abstract-short" style="display: inline;"> Positronium in the $2^3S$ metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns) making it a promising candidate for interferometry experiments with a neutral matter-antimatter system. In the present work, $2^3S$ positronium is produced - in absence of electric field - via spontaneous radiative decay from the $3^3P$ level populated with a 205nm UV laser pulse. Than… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.01808v2-abstract-full').style.display = 'inline'; document.getElementById('1808.01808v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.01808v2-abstract-full" style="display: none;"> Positronium in the $2^3S$ metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns) making it a promising candidate for interferometry experiments with a neutral matter-antimatter system. In the present work, $2^3S$ positronium is produced - in absence of electric field - via spontaneous radiative decay from the $3^3P$ level populated with a 205nm UV laser pulse. Thanks to the short temporal length of the pulse, 1.5 ns full-width at half maximum, different velocity populations of a positronium cloud emitted from a nanochannelled positron/positronium converter were selected by delaying the excitation pulse with respect to the production instant. $ 2^3S $ positronium atoms with velocity tuned between $ 7 \cdot 10^4 $ m/s and $ 10 \cdot 10^4 $ m/s were thus produced. Depending on the selected velocity, a $2^3S$ production effciency ranging from $\sim 0.8 \%$ to $\sim 1.7%$, with respect to the total amount of emitted positronium, was obtained. The observed results give a branching ratio for the $3^3P$-$2^3S$ spontaneous decay of $(9.7 \pm 2.7) \% $. The present velocity selection technique could allow to produce an almost monochromatic beam of $\sim 1 \cdot 10^3 $ $2^3S$ atoms with a velocity spread $ < 10^4 $ m/s and an angular divergence of $\sim$ 50 mrad. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.01808v2-abstract-full').style.display = 'none'; document.getElementById('1808.01808v2-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 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">6 pages, 3 figures, 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 99, 033405 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.07012">arXiv:1802.07012</a> <span> [<a href="https://arxiv.org/pdf/1802.07012">pdf</a>, <a href="https://arxiv.org/format/1802.07012">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-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/10.1103/PhysRevA.98.013402">10.1103/PhysRevA.98.013402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Producing long-lived $2^3\text{S}$ Ps via $3^3\text{P}$ laser excitation in magnetic and electric fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aghion%2C+S">S. Aghion</a>, <a href="/search/physics?searchtype=author&query=Amsler%2C+C">C. Amsler</a>, <a href="/search/physics?searchtype=author&query=Antonello%2C+M">M. Antonello</a>, <a href="/search/physics?searchtype=author&query=Belov%2C+A">A. Belov</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Caccia%2C+M">M. Caccia</a>, <a href="/search/physics?searchtype=author&query=Camper%2C+A">A. Camper</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Demetrio%2C+A">A. Demetrio</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Evans%2C+C">C. Evans</a>, <a href="/search/physics?searchtype=author&query=Fani%2C+M">M. Fani</a>, <a href="/search/physics?searchtype=author&query=Ferragut%2C+R">R. Ferragut</a>, <a href="/search/physics?searchtype=author&query=Fesel%2C+J">J. Fesel</a>, <a href="/search/physics?searchtype=author&query=Fontana%2C+A">A. Fontana</a>, <a href="/search/physics?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/physics?searchtype=author&query=Giammarchi%2C+M">M. Giammarchi</a>, <a href="/search/physics?searchtype=author&query=Gligorova%2C+A">A. Gligorova</a>, <a href="/search/physics?searchtype=author&query=Guatieri%2C+F">F. Guatieri</a> , et al. (40 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="1802.07012v1-abstract-short" style="display: inline;"> Producing positronium (Ps) in the metastable $2^3\text{S}$ state is of interest for various applications in fundamental physics. We report here about an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the $3^3\text{P}$ level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in pre… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.07012v1-abstract-full').style.display = 'inline'; document.getElementById('1802.07012v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.07012v1-abstract-full" style="display: none;"> Producing positronium (Ps) in the metastable $2^3\text{S}$ state is of interest for various applications in fundamental physics. We report here about an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the $3^3\text{P}$ level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25 mT and an average electric field of 300 V/cm. The indication of the $2^3\text{S}$ state production is obtained from a novel analysis technique of single-shot positronium annihilation lifetime spectra. Its production efficiency relative to the total amount of formed Ps is evaluated by fitting a simple rate equations model to the experimental data and found to be $ (2.1 \pm 1.3) \, \% $. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.07012v1-abstract-full').style.display = 'none'; document.getElementById('1802.07012v1-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 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 98, 013402 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1701.06306">arXiv:1701.06306</a> <span> [<a href="https://arxiv.org/pdf/1701.06306">pdf</a>, <a href="https://arxiv.org/format/1701.06306">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 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/10.1088/1748-0221/12/04/P04021">10.1088/1748-0221/12/04/P04021 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aghion%2C+S">S. Aghion</a>, <a href="/search/physics?searchtype=author&query=Amsler%2C+C">C. Amsler</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+A">A. Ariga</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+T">T. Ariga</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Braunig%2C+P">P. Braunig</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Cabaret%2C+L">L. Cabaret</a>, <a href="/search/physics?searchtype=author&query=Caccia%2C+M">M. Caccia</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Demetrio%2C+A">A. Demetrio</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Ereditato%2C+A">A. Ereditato</a>, <a href="/search/physics?searchtype=author&query=Evans%2C+C">C. Evans</a>, <a href="/search/physics?searchtype=author&query=Ferragut%2C+R">R. Ferragut</a>, <a href="/search/physics?searchtype=author&query=Fesel%2C+J">J. Fesel</a>, <a href="/search/physics?searchtype=author&query=Fontana%2C+A">A. Fontana</a>, <a href="/search/physics?searchtype=author&query=Gerber%2C+S">S. Gerber</a>, <a href="/search/physics?searchtype=author&query=Giammarchi%2C+M">M. Giammarchi</a>, <a href="/search/physics?searchtype=author&query=Gligorova%2C+A">A. Gligorova</a> , et al. (47 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="1701.06306v2-abstract-short" style="display: inline;"> The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, and Monte Carlo simulation packages that use different models provide different descriptions of the annihilation events. In this study, we measured the particle multiplicities resulting from antiproton annihilations on nuclei. The results were compared with predi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.06306v2-abstract-full').style.display = 'inline'; document.getElementById('1701.06306v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1701.06306v2-abstract-full" style="display: none;"> The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, and Monte Carlo simulation packages that use different models provide different descriptions of the annihilation events. In this study, we measured the particle multiplicities resulting from antiproton annihilations on nuclei. The results were compared with predictions obtained using different models in the simulation tools GEANT4 and FLUKA. For this study, we exposed thin targets (Cu, Ag and Au) to a very low energy antiproton beam from CERN's Antiproton Decelerator, exploiting the secondary beamline available in the AEgIS experimental zone. The antiproton annihilation products were detected using emulsion films developed at the Laboratory of High Energy Physics in Bern, where they were analysed at the automatic microscope facility. The fragment multiplicity measured in this study is in good agreement with results obtained with FLUKA simulations for both minimally and heavily ionizing particles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.06306v2-abstract-full').style.display = 'none'; document.getElementById('1701.06306v2-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> 23 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> 2017 JINST 12 P04021 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.05882">arXiv:1612.05882</a> <span> [<a href="https://arxiv.org/pdf/1612.05882">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Biomolecules">q-bio.BM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</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/10.1016/j.bbagen.2016.12.008">10.1016/j.bbagen.2016.12.008 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Folding of guanine quadruplex molecules -- funnel-like mechanism or kinetic partitioning? An overview from MD simulation studies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=%C5%A0poner%2C+J">Ji艡铆艩poner</a>, <a href="/search/physics?searchtype=author&query=Bussi%2C+G">Giovanni Bussi</a>, <a href="/search/physics?searchtype=author&query=Stadlbauer%2C+P">Petr Stadlbauer</a>, <a href="/search/physics?searchtype=author&query=K%C3%BChrov%C3%A1%2C+P">Petra K眉hrov谩</a>, <a href="/search/physics?searchtype=author&query=Ban%C3%A1%C5%A1%2C+P">Pavel Ban谩拧</a>, <a href="/search/physics?searchtype=author&query=Islam%2C+B">Barira Islam</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">Shozeb Haider</a>, <a href="/search/physics?searchtype=author&query=Neidle%2C+S">Stephen Neidle</a>, <a href="/search/physics?searchtype=author&query=Otyepka%2C+M">Michal Otyepka</a> </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="1612.05882v1-abstract-short" style="display: inline;"> Background: Guanine quadruplexes (GQs) play vital roles in many cellular processes and are of much interest as drug targets. In contrast to the availability of many structural studies, there is still limited knowledge on GQ folding. Scope of review: We review recent molecular dynamics (MD) simulation studies of the folding of GQs, with an emphasis paid to the human telomeric DNA GQ. We explain t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.05882v1-abstract-full').style.display = 'inline'; document.getElementById('1612.05882v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.05882v1-abstract-full" style="display: none;"> Background: Guanine quadruplexes (GQs) play vital roles in many cellular processes and are of much interest as drug targets. In contrast to the availability of many structural studies, there is still limited knowledge on GQ folding. Scope of review: We review recent molecular dynamics (MD) simulation studies of the folding of GQs, with an emphasis paid to the human telomeric DNA GQ. We explain the basic principles and limitations of all types of MD methods used to study unfolding and folding in a way accessible to non-specialists. We discuss the potential role of G-hairpin, G-triplex and alternative GQ intermediates in the folding process. We argue that, in general, folding of GQs is fundamentally different from funneled folding of small fast-folding proteins, and can be best described by a kinetic partitioning (KP) mechanism. KP is a competition between at least two (but often many) well-separated and structurally different conformational ensembles. Major conclusions: The KP mechanism is the only plausible way to explain experiments reporting long time-scales of GQ folding and the existence of long-lived sub-states. A significant part of the natural partitioning of the free energy landscape of GQs comes from the ability of the GQ-forming sequences to populate a large number of syn-anti patterns in their G-tracts. The extreme complexity of the KP of GQs typically prevents an appropriate description of the folding landscape using just a few order parameters or collective variables. General significance: We reconcile available computational and experimental studies of GQ folding and formulate basic principles characterizing GQ folding landscapes <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.05882v1-abstract-full').style.display = 'none'; document.getElementById('1612.05882v1-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 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">\c{opyright} 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> BBA-Gen. Subjects 1861, 1246 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1311.4982">arXiv:1311.4982</a> <span> [<a href="https://arxiv.org/pdf/1311.4982">pdf</a>, <a href="https://arxiv.org/format/1311.4982">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> </div> </div> <p class="title is-5 mathjax"> Annihilation of low energy antiprotons in silicon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aghion%2C+S">S. Aghion</a>, <a href="/search/physics?searchtype=author&query=Ahl%C3%A9n%2C+O">O. Ahl茅n</a>, <a href="/search/physics?searchtype=author&query=Belov%2C+A+S">A. S. Belov</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Br%C3%A4unig%2C+P">P. Br盲unig</a>, <a href="/search/physics?searchtype=author&query=Bremer%2C+J">J. Bremer</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Burghart%2C+G">G. Burghart</a>, <a href="/search/physics?searchtype=author&query=Cabaret%2C+L">L. Cabaret</a>, <a href="/search/physics?searchtype=author&query=Caccia%2C+M">M. Caccia</a>, <a href="/search/physics?searchtype=author&query=Canali%2C+C">C. Canali</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Cialdi%2C+S">S. Cialdi</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Derking%2C+J+H">J. H. Derking</a>, <a href="/search/physics?searchtype=author&query=Di+Domizio%2C+S">S. Di Domizio</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Dudarev%2C+A">A. Dudarev</a>, <a href="/search/physics?searchtype=author&query=Ferragut%2C+R">R. Ferragut</a>, <a href="/search/physics?searchtype=author&query=Fontana%2C+A">A. Fontana</a>, <a href="/search/physics?searchtype=author&query=Genova%2C+P">P. Genova</a> , et al. (34 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="1311.4982v2-abstract-short" style="display: inline;"> The goal of the AE$\mathrm{\bar{g}}$IS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth's gravitational acceleration on antimatter. To achieve this goal, the AE$\mathrm{\bar{g}}$IS collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with a velocity of a few 100 m/s and measure the magnitude of the vertical deflection of the beam from a straig… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.4982v2-abstract-full').style.display = 'inline'; document.getElementById('1311.4982v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1311.4982v2-abstract-full" style="display: none;"> The goal of the AE$\mathrm{\bar{g}}$IS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth's gravitational acceleration on antimatter. To achieve this goal, the AE$\mathrm{\bar{g}}$IS collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with a velocity of a few 100 m/s and measure the magnitude of the vertical deflection of the beam from a straight path. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1$%$ precision on the measurement of $\bar{g}$ with about 600 reconstructed and time tagged annihilations. We present here, to the best of our knowledge, the first direct measurement of antiproton annihilation in a segmented silicon sensor, the first step towards designing a position sensitive silicon detector for the AE$\mathrm{\bar{g}}$IS experiment. We also present a first comparison with Monte Carlo simulations (GEANT4) for antiproton energies below 5 MeV <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.4982v2-abstract-full').style.display = 'none'; document.getElementById('1311.4982v2-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 March, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 November, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2013. </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 in total, 29 figures, 3 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.5602">arXiv:1306.5602</a> <span> [<a href="https://arxiv.org/pdf/1306.5602">pdf</a>, <a href="https://arxiv.org/format/1306.5602">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/10.1088/1748-0221/8/08/P08013">10.1088/1748-0221/8/08/P08013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Prospects for measuring the gravitational free-fall of antihydrogen with emulsion detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=AEgIS+Collaboration"> AEgIS Collaboration</a>, <a href="/search/physics?searchtype=author&query=Aghion%2C+S">S. Aghion</a>, <a href="/search/physics?searchtype=author&query=Ahl%C3%A9n%2C+O">O. Ahl茅n</a>, <a href="/search/physics?searchtype=author&query=Amsler%2C+C">C. Amsler</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+A">A. Ariga</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+T">T. Ariga</a>, <a href="/search/physics?searchtype=author&query=Belov%2C+A+S">A. S. Belov</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Br%C3%A4unig%2C+P">P. Br盲unig</a>, <a href="/search/physics?searchtype=author&query=Bremer%2C+J">J. Bremer</a>, <a href="/search/physics?searchtype=author&query=Brusa%2C+R+S">R. S. Brusa</a>, <a href="/search/physics?searchtype=author&query=Cabaret%2C+L">L. Cabaret</a>, <a href="/search/physics?searchtype=author&query=Canali%2C+C">C. Canali</a>, <a href="/search/physics?searchtype=author&query=Caravita%2C+R">R. Caravita</a>, <a href="/search/physics?searchtype=author&query=Castelli%2C+F">F. Castelli</a>, <a href="/search/physics?searchtype=author&query=Cerchiari%2C+G">G. Cerchiari</a>, <a href="/search/physics?searchtype=author&query=Cialdi%2C+S">S. Cialdi</a>, <a href="/search/physics?searchtype=author&query=Comparat%2C+D">D. Comparat</a>, <a href="/search/physics?searchtype=author&query=Consolati%2C+G">G. Consolati</a>, <a href="/search/physics?searchtype=author&query=Derking%2C+J+H">J. H. Derking</a>, <a href="/search/physics?searchtype=author&query=Di+Domizio%2C+S">S. Di Domizio</a>, <a href="/search/physics?searchtype=author&query=Di+Noto%2C+L">L. Di Noto</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Dudarev%2C+A">A. Dudarev</a>, <a href="/search/physics?searchtype=author&query=Ereditato%2C+A">A. Ereditato</a> , et al. (46 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="1306.5602v1-abstract-short" style="display: inline;"> The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moir茅 deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5602v1-abstract-full').style.display = 'inline'; document.getElementById('1306.5602v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.5602v1-abstract-full" style="display: none;"> The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moir茅 deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the time of flight. Nuclear emulsions can measure the annihilation vertex of antihydrogen atoms with a precision of about 1 - 2 microns r.m.s. We present here results for emulsion detectors operated in vacuum using low energy antiprotons from the CERN antiproton decelerator. We compare with Monte Carlo simulations, and discuss the impact on the AEgIS project. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.5602v1-abstract-full').style.display = 'none'; document.getElementById('1306.5602v1-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> 24 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </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, 16 figures, 3 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1103.0797">arXiv:1103.0797</a> <span> [<a href="https://arxiv.org/pdf/1103.0797">pdf</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/10.1016/j.nima.2011.12.086">10.1016/j.nima.2011.12.086 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Streamlined Calibrations of the ATLAS Precision Muon Chambers for Initial LHC Running </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amram%2C+N">N. Amram</a>, <a href="/search/physics?searchtype=author&query=Ball%2C+R">R. Ball</a>, <a href="/search/physics?searchtype=author&query=Benhammou%2C+Y">Y. Benhammou</a>, <a href="/search/physics?searchtype=author&query=Moshe%2C+M+B">M. Ben Moshe</a>, <a href="/search/physics?searchtype=author&query=Dai%2C+T">T. Dai</a>, <a href="/search/physics?searchtype=author&query=Diehl%2C+E+B">E. B. Diehl</a>, <a href="/search/physics?searchtype=author&query=Dubbert%2C+J">J. Dubbert</a>, <a href="/search/physics?searchtype=author&query=Etzion%2C+E">E. Etzion</a>, <a href="/search/physics?searchtype=author&query=Ferretti%2C+C">C. Ferretti</a>, <a href="/search/physics?searchtype=author&query=Gregory%2C+J">J. Gregory</a>, <a href="/search/physics?searchtype=author&query=Haider%2C+S">S. Haider</a>, <a href="/search/physics?searchtype=author&query=Hindes%2C+J">J. Hindes</a>, <a href="/search/physics?searchtype=author&query=Levin%2C+D+S">D. S. Levin</a>, <a href="/search/physics?searchtype=author&query=Thun%2C+R">R. Thun</a>, <a href="/search/physics?searchtype=author&query=Wilson%2C+A">A. Wilson</a>, <a href="/search/physics?searchtype=author&query=Weaverdyck%2C+C">C. Weaverdyck</a>, <a href="/search/physics?searchtype=author&query=Wu%2C+Y">Y. Wu</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+H">H. Yang</a>, <a href="/search/physics?searchtype=author&query=Zhou%2C+B">B. Zhou</a>, <a href="/search/physics?searchtype=author&query=Zimmermann%2C+S">S. Zimmermann</a> </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="1103.0797v2-abstract-short" style="display: inline;"> The ATLAS Muon Spectrometer is designed to measure the momentum of muons with a resolution of dp/p = 3% and 10% at 100 GeV and 1 TeV momentum respectively. For this task, the spectrometer employs 355,000 Monitored Drift Tubes (MDTs) arrayed in 1200 Chambers. Calibration (RT) functions convert drift time measurements into tube-centered impact parameters for track segment reconstruction. RT function… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.0797v2-abstract-full').style.display = 'inline'; document.getElementById('1103.0797v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1103.0797v2-abstract-full" style="display: none;"> The ATLAS Muon Spectrometer is designed to measure the momentum of muons with a resolution of dp/p = 3% and 10% at 100 GeV and 1 TeV momentum respectively. For this task, the spectrometer employs 355,000 Monitored Drift Tubes (MDTs) arrayed in 1200 Chambers. Calibration (RT) functions convert drift time measurements into tube-centered impact parameters for track segment reconstruction. RT functions depend on MDT environmental parameters and so must be appropriately calibrated for local chamber conditions. We report on the creation and application of a gas monitor system based calibration program for muon track reconstruction in the LHC startup phase. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.0797v2-abstract-full').style.display = 'none'; document.getElementById('1103.0797v2-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> 7 March, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 March, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2011. </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">25 pages, 21 figures</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 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