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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/2502.07897">arXiv:2502.07897</a> <span> [<a href="https://arxiv.org/pdf/2502.07897">pdf</a>, <a href="https://arxiv.org/format/2502.07897">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Terahertz electroluminescence from Dirac-Landau polaritons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Benhamou-Bui%2C+B">B. Benhamou-Bui</a>, <a href="/search/physics?searchtype=author&query=Consejo%2C+C">C. Consejo</a>, <a href="/search/physics?searchtype=author&query=Krishtopenko%2C+S+S">S. S. Krishtopenko</a>, <a href="/search/physics?searchtype=author&query=Ruffenach%2C+S">S. Ruffenach</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C. Bray</a>, <a href="/search/physics?searchtype=author&query=Torres%2C+J">J. Torres</a>, <a href="/search/physics?searchtype=author&query=Dzian%2C+J">J. Dzian</a>, <a href="/search/physics?searchtype=author&query=Mardel%C3%A9%2C+F+L">F. Le Mardel茅</a>, <a href="/search/physics?searchtype=author&query=Pagot%2C+A">A. Pagot</a>, <a href="/search/physics?searchtype=author&query=Baudry%2C+X">X. Baudry</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+S+V">S. V. Morozov</a>, <a href="/search/physics?searchtype=author&query=Mikhailov%2C+N+N">N. N. Mikhailov</a>, <a href="/search/physics?searchtype=author&query=Dvoretskii%2C+S+A">S. A. Dvoretskii</a>, <a href="/search/physics?searchtype=author&query=Jouault%2C+B">B. Jouault</a>, <a href="/search/physics?searchtype=author&query=Ballet%2C+P">P. Ballet</a>, <a href="/search/physics?searchtype=author&query=Orlita%2C+M">M. Orlita</a>, <a href="/search/physics?searchtype=author&query=Ciuti%2C+C">C. Ciuti</a>, <a href="/search/physics?searchtype=author&query=Teppe%2C+F">F. Teppe</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="2502.07897v1-abstract-short" style="display: inline;"> We report intense terahertz electroluminescence from Dirac-Landau polaritons, representing a major step toward achieving stimulated cyclotron emission and polariton-based lasers. By strongly coupling the cyclotron transitions of two-dimensional Dirac fermions in HgTe quantum wells with optical cavity modes, we observe efficient emission near the lasing threshold. This work demonstrates that polari… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.07897v1-abstract-full').style.display = 'inline'; document.getElementById('2502.07897v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2502.07897v1-abstract-full" style="display: none;"> We report intense terahertz electroluminescence from Dirac-Landau polaritons, representing a major step toward achieving stimulated cyclotron emission and polariton-based lasers. By strongly coupling the cyclotron transitions of two-dimensional Dirac fermions in HgTe quantum wells with optical cavity modes, we observe efficient emission near the lasing threshold. This work demonstrates that polariton condensation, a process that bypasses the need for electronic population inversion, can significantly reduce the emission threshold compared to conventional mechanisms requiring high electric fields. Moreover, this concept unlocks the potential for stimulated emission in previously unsuitable narrow-gap semiconductors, as well as Dirac materials with non-equidistant Landau levels. These results open a new way for the development of compact, tunable terahertz lasers based on Landau polaritons, offering new opportunities for solid-state laser technology and applications in the terahertz gap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.07897v1-abstract-full').style.display = 'none'; document.getElementById('2502.07897v1-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 February, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2025. </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">Manuscript and Supplementary Materials</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.01309">arXiv:2412.01309</a> <span> [<a href="https://arxiv.org/pdf/2412.01309">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> </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/10.1039/C8AN01180J">10.1039/C8AN01180J <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Monitoring of food spoilage by high resolution THz analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hindle%2C+F">Francis Hindle</a>, <a href="/search/physics?searchtype=author&query=Kuuliala%2C+L">Lotta Kuuliala</a>, <a href="/search/physics?searchtype=author&query=Mouelhi%2C+M">Meriem Mouelhi</a>, <a href="/search/physics?searchtype=author&query=Cuisset%2C+A">Arnaud Cuisset</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C茅dric Bray</a>, <a href="/search/physics?searchtype=author&query=Vanwolleghem%2C+M">Mathias Vanwolleghem</a>, <a href="/search/physics?searchtype=author&query=Devlieghere%2C+F">Frank Devlieghere</a>, <a href="/search/physics?searchtype=author&query=Mouret%2C+G">Gael Mouret</a>, <a href="/search/physics?searchtype=author&query=Bocquet%2C+R">Robin Bocquet</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="2412.01309v1-abstract-short" style="display: inline;"> High resolution rotational Terahertz (THz) spectroscopy has been widely applied to the studies of numerous polar gas phase molecules, in particular volatile organic compounds (VOCs). During the storage of foodstuffs packed under a protective atmosphere, microbial activity will lead to the generation of a complex mixture of trace gases that could be used as food spoilage indicators. Here we have de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.01309v1-abstract-full').style.display = 'inline'; document.getElementById('2412.01309v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.01309v1-abstract-full" style="display: none;"> High resolution rotational Terahertz (THz) spectroscopy has been widely applied to the studies of numerous polar gas phase molecules, in particular volatile organic compounds (VOCs). During the storage of foodstuffs packed under a protective atmosphere, microbial activity will lead to the generation of a complex mixture of trace gases that could be used as food spoilage indicators. Here we have demonstrated that the THz instrumentation presently available provides sufficient sensitivity and selectivity to monitor the generation of hydrogen sulfide (H2S) in the headspace of packed Atlantic salmon (Salmo salar) fillet portions. A comprehensive comparison was made by selective-ion flow-tube mass spectrometry (SIFT-MS) in order to validate the THz measurements and protocol. The detectivity of a range of alternative compounds for this application is also provided, based on the experimental detection limit observed and molecular spectroscopic properties. Molecules like ethanol, methyl mercaptan and ammonia are suitable indicators with the presently available sensitivity levels, while dimethyl sulfide, acetone and butanone may be considered with a sensitivity improvement of 2 orders of magnitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.01309v1-abstract-full').style.display = 'none'; document.getElementById('2412.01309v1-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Analyst, 2018, 143 (22), pp.5536-5544 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.08076">arXiv:2411.08076</a> <span> [<a href="https://arxiv.org/pdf/2411.08076">pdf</a>, <a href="https://arxiv.org/format/2411.08076">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="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> High-Precision Excited-State Nuclear Recoil Spectroscopy with Superconducting Sensors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bray%2C+C">C. Bray</a>, <a href="/search/physics?searchtype=author&query=Fretwell%2C+S">S. Fretwell</a>, <a href="/search/physics?searchtype=author&query=Zepeda-Ruiz%2C+L+A">L. A. Zepeda-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+I">I. Kim</a>, <a href="/search/physics?searchtype=author&query=Samanta%2C+A">A. Samanta</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+K">K. Wang</a>, <a href="/search/physics?searchtype=author&query=Stone-Whitehead%2C+C">C. Stone-Whitehead</a>, <a href="/search/physics?searchtype=author&query=Warburton%2C+W+K">W. K. Warburton</a>, <a href="/search/physics?searchtype=author&query=Ponce%2C+F">F. Ponce</a>, <a href="/search/physics?searchtype=author&query=Leach%2C+K+G">K. G. Leach</a>, <a href="/search/physics?searchtype=author&query=Abells%2C+R">R. Abells</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+P">P. Amaro</a>, <a href="/search/physics?searchtype=author&query=Andoche%2C+A">A. Andoche</a>, <a href="/search/physics?searchtype=author&query=Cantor%2C+R">R. Cantor</a>, <a href="/search/physics?searchtype=author&query=Diercks%2C+D">D. Diercks</a>, <a href="/search/physics?searchtype=author&query=Guerra%2C+M">M. Guerra</a>, <a href="/search/physics?searchtype=author&query=Hall%2C+A">A. Hall</a>, <a href="/search/physics?searchtype=author&query=Harris%2C+C">C. Harris</a>, <a href="/search/physics?searchtype=author&query=Harris%2C+J">J. Harris</a>, <a href="/search/physics?searchtype=author&query=Hayen%2C+L">L. Hayen</a>, <a href="/search/physics?searchtype=author&query=Hervieux%2C+P+A">P. A. Hervieux</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+G+B">G. B. Kim</a>, <a href="/search/physics?searchtype=author&query=Lennarz%2C+A">A. Lennarz</a>, <a href="/search/physics?searchtype=author&query=Lordi%2C+V">V. Lordi</a>, <a href="/search/physics?searchtype=author&query=Machado%2C+J">J. Machado</a> , et al. (8 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="2411.08076v2-abstract-short" style="display: inline;"> Superconducting sensors doped with rare isotopes have recently demonstrated powerful sensing performance for sub-keV radiation from nuclear decay. Here, we report the first high-resolution recoil spectroscopy of a single, selected nuclear state using superconducting tunnel junction (STJ) sensors. The STJ sensors were used to measure the eV-scale nuclear recoils produced in $^7$Be electron capture… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.08076v2-abstract-full').style.display = 'inline'; document.getElementById('2411.08076v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.08076v2-abstract-full" style="display: none;"> Superconducting sensors doped with rare isotopes have recently demonstrated powerful sensing performance for sub-keV radiation from nuclear decay. Here, we report the first high-resolution recoil spectroscopy of a single, selected nuclear state using superconducting tunnel junction (STJ) sensors. The STJ sensors were used to measure the eV-scale nuclear recoils produced in $^7$Be electron capture decay in coincidence with a 478 keV $纬$-ray emitted in decays to the lowest-lying excited nuclear state in $^7$Li. Details of the Doppler broadened recoil spectrum depend on the slow-down dynamics of the recoil ion. The measured spectral broadening is compared to empirical stopping power models as well as modern molecular dynamics simulations at low energy. The results have implications in several areas from nuclear structure and stopping powers at eV-scale energies to direct searches for dark matter, neutrino mass measurements, and other physics beyond the standard model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.08076v2-abstract-full').style.display = 'none'; document.getElementById('2411.08076v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.19085">arXiv:2409.19085</a> <span> [<a href="https://arxiv.org/pdf/2409.19085">pdf</a>, <a href="https://arxiv.org/format/2409.19085">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> <p class="title is-5 mathjax"> Signal processing and spectral modeling for the BeEST experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kim%2C+I">Inwook Kim</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">Connor Bray</a>, <a href="/search/physics?searchtype=author&query=Marino%2C+A">Andrew Marino</a>, <a href="/search/physics?searchtype=author&query=Stone-Whitehead%2C+C">Caitlyn Stone-Whitehead</a>, <a href="/search/physics?searchtype=author&query=Lamm%2C+A">Amii Lamm</a>, <a href="/search/physics?searchtype=author&query=Abells%2C+R">Ryan Abells</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+P">Pedro Amaro</a>, <a href="/search/physics?searchtype=author&query=Andoche%2C+A">Adrien Andoche</a>, <a href="/search/physics?searchtype=author&query=Cantor%2C+R">Robin Cantor</a>, <a href="/search/physics?searchtype=author&query=Diercks%2C+D">David Diercks</a>, <a href="/search/physics?searchtype=author&query=Fretwell%2C+S">Spencer Fretwell</a>, <a href="/search/physics?searchtype=author&query=Gillespie%2C+A">Abigail Gillespie</a>, <a href="/search/physics?searchtype=author&query=Guerra%2C+M">Mauro Guerra</a>, <a href="/search/physics?searchtype=author&query=Hall%2C+A">Ad Hall</a>, <a href="/search/physics?searchtype=author&query=Harris%2C+C+N">Cameron N. Harris</a>, <a href="/search/physics?searchtype=author&query=Harris%2C+J+T">Jackson T. Harris</a>, <a href="/search/physics?searchtype=author&query=Hinkle%2C+C">Calvin Hinkle</a>, <a href="/search/physics?searchtype=author&query=Hayen%2C+L+M">Leendert M. Hayen</a>, <a href="/search/physics?searchtype=author&query=Hervieux%2C+P">Paul-Antoine Hervieux</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+G">Geon-Bo Kim</a>, <a href="/search/physics?searchtype=author&query=Leach%2C+K+G">Kyle G. Leach</a>, <a href="/search/physics?searchtype=author&query=Lennarz%2C+A">Annika Lennarz</a>, <a href="/search/physics?searchtype=author&query=Lordi%2C+V">Vincenzo Lordi</a>, <a href="/search/physics?searchtype=author&query=Machado%2C+J">Jorge Machado</a>, <a href="/search/physics?searchtype=author&query=McKeen%2C+D">David McKeen</a> , et al. (13 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="2409.19085v3-abstract-short" style="display: inline;"> The Beryllium Electron capture in Superconducting Tunnel junctions (BeEST) experiment searches for evidence of heavy neutrino mass eigenstates in the nuclear electron capture decay of $^7$Be by precisely measuring the recoil energy of the $^7$Li daughter. In Phase-III, the BeEST experiment has been scaled from a single superconducting tunnel junction (STJ) sensor to a 36-pixel array to increase se… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.19085v3-abstract-full').style.display = 'inline'; document.getElementById('2409.19085v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.19085v3-abstract-full" style="display: none;"> The Beryllium Electron capture in Superconducting Tunnel junctions (BeEST) experiment searches for evidence of heavy neutrino mass eigenstates in the nuclear electron capture decay of $^7$Be by precisely measuring the recoil energy of the $^7$Li daughter. In Phase-III, the BeEST experiment has been scaled from a single superconducting tunnel junction (STJ) sensor to a 36-pixel array to increase sensitivity and mitigate gamma-induced backgrounds. Phase-III also uses a new continuous data acquisition system that greatly increases the flexibility for signal processing and data cleaning. We have developed procedures for signal processing and spectral fitting that are sufficiently robust to be automated for large data sets. This article presents the optimized procedures before unblinding the majority of the Phase-III data set to search for physics beyond the standard model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.19085v3-abstract-full').style.display = 'none'; document.getElementById('2409.19085v3-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> 17 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.12278">arXiv:2311.12278</a> <span> [<a href="https://arxiv.org/pdf/2311.12278">pdf</a>, <a href="https://arxiv.org/format/2311.12278">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="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> The Data Acquisition System for Phase-III of the BeEST Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bray%2C+C">C. Bray</a>, <a href="/search/physics?searchtype=author&query=Fretwell%2C+S">S. Fretwell</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+I">I. Kim</a>, <a href="/search/physics?searchtype=author&query=Warburton%2C+W+K">W. K. Warburton</a>, <a href="/search/physics?searchtype=author&query=Ponce%2C+F">F. Ponce</a>, <a href="/search/physics?searchtype=author&query=Leach%2C+K+G">K. G. Leach</a>, <a href="/search/physics?searchtype=author&query=Friedrich%2C+S">S. Friedrich</a>, <a href="/search/physics?searchtype=author&query=Abells%2C+R">R. Abells</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+P">P. Amaro</a>, <a href="/search/physics?searchtype=author&query=Andoche%2C+A">A. Andoche</a>, <a href="/search/physics?searchtype=author&query=Cantor%2C+R">R. Cantor</a>, <a href="/search/physics?searchtype=author&query=Diercks%2C+D">D. Diercks</a>, <a href="/search/physics?searchtype=author&query=Guerra%2C+M">M. Guerra</a>, <a href="/search/physics?searchtype=author&query=Hall%2C+A">A. Hall</a>, <a href="/search/physics?searchtype=author&query=Harris%2C+C">C. Harris</a>, <a href="/search/physics?searchtype=author&query=Harris%2C+J">J. Harris</a>, <a href="/search/physics?searchtype=author&query=Hayen%2C+L">L. Hayen</a>, <a href="/search/physics?searchtype=author&query=Hervieux%2C+P+A">P. A. Hervieux</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+G+B">G. B. Kim</a>, <a href="/search/physics?searchtype=author&query=Lennarz%2C+A">A. Lennarz</a>, <a href="/search/physics?searchtype=author&query=Lordi%2C+V">V. Lordi</a>, <a href="/search/physics?searchtype=author&query=Machado%2C+J">J. Machado</a>, <a href="/search/physics?searchtype=author&query=Machule%2C+P">P. Machule</a>, <a href="/search/physics?searchtype=author&query=Marino%2C+A">A. Marino</a>, <a href="/search/physics?searchtype=author&query=McKeen%2C+D">D. McKeen</a> , et al. (5 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.12278v1-abstract-short" style="display: inline;"> The BeEST experiment is a precision laboratory search for physics beyond the standard model that measures the electron capture decay of $^7$Be implanted into superconducting tunnel junction (STJ) detectors. For Phase-III of the experiment, we constructed a continuously sampling data acquisition system to extract pulse shape and timing information from 16 STJ pixels offline. Four additional pixels… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.12278v1-abstract-full').style.display = 'inline'; document.getElementById('2311.12278v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.12278v1-abstract-full" style="display: none;"> The BeEST experiment is a precision laboratory search for physics beyond the standard model that measures the electron capture decay of $^7$Be implanted into superconducting tunnel junction (STJ) detectors. For Phase-III of the experiment, we constructed a continuously sampling data acquisition system to extract pulse shape and timing information from 16 STJ pixels offline. Four additional pixels are read out with a fast list-mode digitizer, and one with a nuclear MCA already used in the earlier limit-setting phases of the experiment. We present the performance of the data acquisition system and discuss the relative advantages of the different digitizers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.12278v1-abstract-full').style.display = 'none'; document.getElementById('2311.12278v1-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 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures, proceedings for The 20th International Conference on Low Temperature Detectors</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.14113">arXiv:2205.14113</a> <span> [<a href="https://arxiv.org/pdf/2205.14113">pdf</a>, <a href="https://arxiv.org/ps/2205.14113">ps</a>, <a href="https://arxiv.org/format/2205.14113">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10909-022-02770-4">10.1007/s10909-022-02770-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Monte-Carlo Simulations of Superconducting Tunnel Junction Quantum Sensors for the BeEST Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bray%2C+C+E">Connor E. Bray</a>, <a href="/search/physics?searchtype=author&query=Hiller%2C+L+J">Larry J. Hiller</a>, <a href="/search/physics?searchtype=author&query=Leach%2C+K+G">Kyle G. Leach</a>, <a href="/search/physics?searchtype=author&query=Friedrich%2C+S">Stephan Friedrich</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="2205.14113v1-abstract-short" style="display: inline;"> Superconducting Tunnel Junctions (STJs) are used as high-resolution quantum sensors to search for evidence of sterile neutrinos in the electron capture decay of $^7$Be. We are developing spatially-resolved Monte-Carlo simulations of the energy relaxation in superconductors to understand electron escape after the $^7$Be decay and distinguish details in the STJ response function from a possible ster… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.14113v1-abstract-full').style.display = 'inline'; document.getElementById('2205.14113v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.14113v1-abstract-full" style="display: none;"> Superconducting Tunnel Junctions (STJs) are used as high-resolution quantum sensors to search for evidence of sterile neutrinos in the electron capture decay of $^7$Be. We are developing spatially-resolved Monte-Carlo simulations of the energy relaxation in superconductors to understand electron escape after the $^7$Be decay and distinguish details in the STJ response function from a possible sterile neutrino signal. Simulations of the charge generation and the Fano factor for different materials agree with the literature values. Initial simulations of the escape tail are consistent with observations, and contain fine structure in the line shape. The line shape will be refined as better experimental data become available. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.14113v1-abstract-full').style.display = 'none'; document.getElementById('2205.14113v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </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">7 pages, 3 figures, LTD19 Conference Proceedings</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.01537">arXiv:2110.01537</a> <span> [<a href="https://arxiv.org/pdf/2110.01537">pdf</a>, <a href="https://arxiv.org/format/2110.01537">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="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.104.112007">10.1103/PhysRevD.104.112007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Kiloton-scale xenon detectors for neutrinoless double beta decay and other new physics searches </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Avasthi%2C+A">A. Avasthi</a>, <a href="/search/physics?searchtype=author&query=Bowyer%2C+T+W">T. W. Bowyer</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C. Bray</a>, <a href="/search/physics?searchtype=author&query=Brunner%2C+T">T. Brunner</a>, <a href="/search/physics?searchtype=author&query=Catarineu%2C+N">N. Catarineu</a>, <a href="/search/physics?searchtype=author&query=Church%2C+E">E. Church</a>, <a href="/search/physics?searchtype=author&query=Guenette%2C+R">R. Guenette</a>, <a href="/search/physics?searchtype=author&query=Haselschwardt%2C+S+J">S. J. Haselschwardt</a>, <a href="/search/physics?searchtype=author&query=Hayes%2C+J+C">J. C. Hayes</a>, <a href="/search/physics?searchtype=author&query=Heffner%2C+M">M. Heffner</a>, <a href="/search/physics?searchtype=author&query=Hertel%2C+S+A">S. A. Hertel</a>, <a href="/search/physics?searchtype=author&query=Humble%2C+P+H">P. H. Humble</a>, <a href="/search/physics?searchtype=author&query=Jamil%2C+A">A. Jamil</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S">S. Kim</a>, <a href="/search/physics?searchtype=author&query=Lang%2C+R+F">R. F. Lang</a>, <a href="/search/physics?searchtype=author&query=Leach%2C+K+G">K. G. Leach</a>, <a href="/search/physics?searchtype=author&query=Lenardo%2C+B+G">B. G. Lenardo</a>, <a href="/search/physics?searchtype=author&query=Lippincott%2C+W+H">W. H. Lippincott</a>, <a href="/search/physics?searchtype=author&query=Marino%2C+A">A. Marino</a>, <a href="/search/physics?searchtype=author&query=McKinsey%2C+D+N">D. N. McKinsey</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+E+H">E. H. Miller</a>, <a href="/search/physics?searchtype=author&query=Moore%2C+D+C">D. C. Moore</a>, <a href="/search/physics?searchtype=author&query=Mong%2C+B">B. Mong</a>, <a href="/search/physics?searchtype=author&query=Monreal%2C+B">B. Monreal</a>, <a href="/search/physics?searchtype=author&query=Monzani%2C+M+E">M. E. Monzani</a> , et al. (9 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="2110.01537v2-abstract-short" style="display: inline;"> Large detectors employing xenon are a leading technology in existing and planned searches for new physics, including searches for neutrinoless double beta decay ($0谓尾尾$) and dark matter. While upcoming detectors will employ target masses of a ton or more, further extending gas or liquid phase Xe detectors to the kton scale would enable extremely sensitive next-generation searches for rare phenomen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.01537v2-abstract-full').style.display = 'inline'; document.getElementById('2110.01537v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.01537v2-abstract-full" style="display: none;"> Large detectors employing xenon are a leading technology in existing and planned searches for new physics, including searches for neutrinoless double beta decay ($0谓尾尾$) and dark matter. While upcoming detectors will employ target masses of a ton or more, further extending gas or liquid phase Xe detectors to the kton scale would enable extremely sensitive next-generation searches for rare phenomena. The key challenge to extending this technology to detectors well beyond the ton scale is the acquisition of the Xe itself. We describe the motivation for extending Xe time projection chambers (TPCs) to the kton scale and possible avenues for Xe acquisition that avoid existing supply chains. If acquisition of Xe in the required quantities is successful, kton-scale detectors of this type could enable a new generation of experiments, including searches for $0谓尾尾$ at half-life sensitivities as long as $10^{30}$ yr. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.01537v2-abstract-full').style.display = 'none'; document.getElementById('2110.01537v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 10 figures; published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 104, 112007 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.05668">arXiv:2106.05668</a> <span> [<a href="https://arxiv.org/pdf/2106.05668">pdf</a>, <a href="https://arxiv.org/format/2106.05668">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/10.1088/1361-6455/ac2e4a">10.1088/1361-6455/ac2e4a <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarization in Strong-Field Ionization of Excited Helium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bray%2C+A+C">A. C. Bray</a>, <a href="/search/physics?searchtype=author&query=Maxwell%2C+A+S">A. S. Maxwell</a>, <a href="/search/physics?searchtype=author&query=Kissin%2C+Y">Y. Kissin</a>, <a href="/search/physics?searchtype=author&query=Ruberti%2C+M">M. Ruberti</a>, <a href="/search/physics?searchtype=author&query=Ciappina%2C+M+F">M. F. Ciappina</a>, <a href="/search/physics?searchtype=author&query=Averbukh%2C+V">V. Averbukh</a>, <a href="/search/physics?searchtype=author&query=Faria%2C+C+F+D+M">C. Figueira De Morisson Faria</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="2106.05668v2-abstract-short" style="display: inline;"> We analyze how bound-state excitation, electron exchange and the residual binding potential influence above-threshold ionization (ATI) in Helium prepared in an excited $p$ state, oriented parallel and perpendicular to a linearly polarized mid-IR field. Using ab initio B-spline Algebraic Diagrammatic Construction (ADC), and several one-electron methods with effective potentials, including the Schr枚… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.05668v2-abstract-full').style.display = 'inline'; document.getElementById('2106.05668v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.05668v2-abstract-full" style="display: none;"> We analyze how bound-state excitation, electron exchange and the residual binding potential influence above-threshold ionization (ATI) in Helium prepared in an excited $p$ state, oriented parallel and perpendicular to a linearly polarized mid-IR field. Using ab initio B-spline Algebraic Diagrammatic Construction (ADC), and several one-electron methods with effective potentials, including the Schr枚dinger solver Qprop, modified versions of the Strong-Field Approximation and the Coulomb-Quantum Orbit Strong-Field Approximation (CQSFA), we find that these specific physical mechanisms leave significant imprints in ATI spectra and photoelectron momentum distributions. Examples are changes of up to two orders of magnitude in the high-energy photoelectron region, and ramp-like structures that can be traced back to Coulomb-distorted trajectories. The present work also shows that electron exchange renders rescattering less effective, causing suppressions in the ATI plateau. Due to the long-range potential, the electron continuum dynamics are no longer confined to the polarization axis, in contrast to the predictions of traditional approaches. Thus, one may in principle probe excited-state configurations perpendicular to the driving-field polarization without the need for orthogonally polarized fields. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.05668v2-abstract-full').style.display = 'none'; document.getElementById('2106.05668v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 8 figures. Fig. 5 has been compressed in order to meet the arXiV requirements. In the revised version, we have streamlined parts of the theory, modified some discussions and the conclusions, and added references</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.00655">arXiv:2012.00655</a> <span> [<a href="https://arxiv.org/pdf/2012.00655">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="Earth and Planetary Astrophysics">astro-ph.EP</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/10.1039/D0CP02083D">10.1039/D0CP02083D <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Kinetic Study of the N(2D) + C2H4 Reaction at Low Temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hickson%2C+K+M">Kevin M. Hickson</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C茅dric Bray</a>, <a href="/search/physics?searchtype=author&query=Loison%2C+J">Jean-Christophe Loison</a>, <a href="/search/physics?searchtype=author&query=Dobrijevic%2C+M">Michel Dobrijevic</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="2012.00655v1-abstract-short" style="display: inline;"> Electronically excited nitrogen atoms N(2D) are important species in the photochemistry of N2 based planetary atmospheres such as Titan. Despite this, few N(2D) reactions have been studied over the appropriate low temperature range. During the present work, rate constants were measured for the N(2D) + ethene (C2H4) reaction using a supersonic flow reactor at temperatures between 50 K and 296 K. He… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.00655v1-abstract-full').style.display = 'inline'; document.getElementById('2012.00655v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.00655v1-abstract-full" style="display: none;"> Electronically excited nitrogen atoms N(2D) are important species in the photochemistry of N2 based planetary atmospheres such as Titan. Despite this, few N(2D) reactions have been studied over the appropriate low temperature range. During the present work, rate constants were measured for the N(2D) + ethene (C2H4) reaction using a supersonic flow reactor at temperatures between 50 K and 296 K. Here, a chemical reaction was used to generate N(2D) atoms, which were detected directly by laser induced fluorescence in the vacuum ultraviolet wavelength region. The measured rate constants displayed very little variation as a function of temperature, with substantially larger values than those obtained in previous work. Indeed, considering an average temperature of 170 K for the atmosphere of Titan leads to a rate constant that is almost seven times larger than the currently recommended value. In parallel, electronic structure calculations were performed to provide insight into the reactive process. While earlier theoretical work at a lower level predicted the presence of a barrier for the N(2D) + C2H4 reaction, the present calculations demonstrate that two of the five doublet potential energy surfaces correlating with reagents are likely to be attractive, presenting no barriers for the perpendicular approach of the N atom to the carbon double bond of ethene. The measured rate constants and new product channels taken from recent dynamical investigations of this process are included in a 1D coupled ion-neutral model of Titans atmosphere. These simulations indicate that the modeled abundances of numerous nitrogen bearing compounds are noticeably affected by these changes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.00655v1-abstract-full').style.display = 'none'; document.getElementById('2012.00655v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">21 pages, 5 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys Chem Chem Phys, 2020, 22, 14026-14035 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.05789">arXiv:2011.05789</a> <span> [<a href="https://arxiv.org/pdf/2011.05789">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="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/10.1039/D0CP03971C">10.1039/D0CP03971C <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental and Theoretical Studies of the N(2D) + H2 and D2 Reactions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nu%C3%B1ez-Reyes%2C+D">Dianailys Nu帽ez-Reyes</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C茅dric Bray</a>, <a href="/search/physics?searchtype=author&query=Hickson%2C+K+M">Kevin M. Hickson</a>, <a href="/search/physics?searchtype=author&query=Larr%C3%A9garay%2C+P">Pascal Larr茅garay</a>, <a href="/search/physics?searchtype=author&query=Bonnet%2C+L">Laurent Bonnet</a>, <a href="/search/physics?searchtype=author&query=Gonz%C3%A1lez-Lezana%2C+T">Tom谩s Gonz谩lez-Lezana</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="2011.05789v1-abstract-short" style="display: inline;"> This study reports the results of an experimental and theoretical investigation of the N(2D) + H2 and N(2D) + D2 reactions at room temperature and below. On the experimental side, a supersonic flow (Laval nozzle) reactor was employed to measure rate constants for these processes at temperatures as low as 127 K. N(2D) was produced indirectly by pulsed laser photolysis and these atoms were detected… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.05789v1-abstract-full').style.display = 'inline'; document.getElementById('2011.05789v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.05789v1-abstract-full" style="display: none;"> This study reports the results of an experimental and theoretical investigation of the N(2D) + H2 and N(2D) + D2 reactions at room temperature and below. On the experimental side, a supersonic flow (Laval nozzle) reactor was employed to measure rate constants for these processes at temperatures as low as 127 K. N(2D) was produced indirectly by pulsed laser photolysis and these atoms were detected directly by pulsed laser induced fluorescence in the vacuum ultraviolet wavelength region. On the theoretical side, two different approaches were used to calculate rate constants for these reactions; a statistical quantum mechanical (SQM) method and a quasi-classical trajectory capture model including a semi-classical correction for tunneling (SC-Capture). This work is described in the context of previous studies, while the discrepancies between both experiment and theory, as well as between the theoretical results themselves are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.05789v1-abstract-full').style.display = 'none'; document.getElementById('2011.05789v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">24 pages, 3 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys Chem Chem Phys., 2020, 22, 23609-23617 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.04895">arXiv:1810.04895</a> <span> [<a href="https://arxiv.org/pdf/1810.04895">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> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10762-017-0445-3">10.1007/s10762-017-0445-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Chirped Pulse Spectrometer Operating at 200 GHz </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hindle%2C+F">Francis Hindle</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C茅dric Bray</a>, <a href="/search/physics?searchtype=author&query=Fontanari%2C+D">Daniele Fontanari</a>, <a href="/search/physics?searchtype=author&query=Mouelhi%2C+M">Meriem Mouelhi</a>, <a href="/search/physics?searchtype=author&query=Cuisset%2C+A">Arnaud Cuisset</a>, <a href="/search/physics?searchtype=author&query=Mouret%2C+G">Gael Mouret</a>, <a href="/search/physics?searchtype=author&query=Bocquet%2C+R">Robin Bocquet</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="1810.04895v1-abstract-short" style="display: inline;"> The combination of electronic sources operating at high frequencies and modern microwave instrumentation has enabled the recent development of chirped-pulse spectrometers for the millimetre and THz bands. This type of instrument can operate at high resolution which is particularly suited to gas phase rotational spectroscopy. The construction of a chirped pulse spectrometer operating at 200 GHz is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.04895v1-abstract-full').style.display = 'inline'; document.getElementById('1810.04895v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.04895v1-abstract-full" style="display: none;"> The combination of electronic sources operating at high frequencies and modern microwave instrumentation has enabled the recent development of chirped-pulse spectrometers for the millimetre and THz bands. This type of instrument can operate at high resolution which is particularly suited to gas phase rotational spectroscopy. The construction of a chirped pulse spectrometer operating at 200 GHz is described in detail while attention is paid to the phase stability and the data accumulation over many cycles. Validation using carbonyl sulphide has allowed the detection limit of the instrument to be established as function of the accumulation. A large number of OCS transitions were identified using a 10 GHz chirped pulse and include the 6 most abundant isotopologues, the weakest line corresponding to the fundamental R(17) transition of 16 O 13 C 33 S with a line strength of 4.3 x 10-26 cm-1 /(molec.cm-2). The linearity of the system response for different degrees of data accumulation and transition line strength was confirmed over 4 orders of magnitudes. A simple analysis of the time domain data was demonstrated to provide the line broadening coefficient without the need for conversion by a Fourier transform. Finally, the pulse duration is discussed and optimal values are given for both Doppler limited and collisional regimes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.04895v1-abstract-full').style.display = 'none'; document.getElementById('1810.04895v1-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 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Infrared, Millimeter and Terahertz Waves, Springer Verlag, 2018, 39 (1), pp.105 - 119 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.00704">arXiv:1502.00704</a> <span> [<a href="https://arxiv.org/pdf/1502.00704">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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> <p class="title is-5 mathjax"> Nonlinear X-ray Compton Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fuchs%2C+M">Matthias Fuchs</a>, <a href="/search/physics?searchtype=author&query=Trigo%2C+M">Mariano Trigo</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J">Jian Chen</a>, <a href="/search/physics?searchtype=author&query=Ghimire%2C+S">Shambhu Ghimire</a>, <a href="/search/physics?searchtype=author&query=Shwartz%2C+S">Sharon Shwartz</a>, <a href="/search/physics?searchtype=author&query=Kozina%2C+M">Michael Kozina</a>, <a href="/search/physics?searchtype=author&query=Jiang%2C+M">Mason Jiang</a>, <a href="/search/physics?searchtype=author&query=Henighan%2C+T">Thomas Henighan</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">Crystal Bray</a>, <a href="/search/physics?searchtype=author&query=Ndabashimiye%2C+G">Georges Ndabashimiye</a>, <a href="/search/physics?searchtype=author&query=Bucksbaum%2C+P+H">P. H. Bucksbaum</a>, <a href="/search/physics?searchtype=author&query=Feng%2C+Y">Yiping Feng</a>, <a href="/search/physics?searchtype=author&query=Herrmann%2C+S">Sven Herrmann</a>, <a href="/search/physics?searchtype=author&query=Carini%2C+G">Gabriella Carini</a>, <a href="/search/physics?searchtype=author&query=Pines%2C+J">Jack Pines</a>, <a href="/search/physics?searchtype=author&query=Hart%2C+P">Philip Hart</a>, <a href="/search/physics?searchtype=author&query=Kenney%2C+C">Christopher Kenney</a>, <a href="/search/physics?searchtype=author&query=Guillet%2C+S">Serge Guillet</a>, <a href="/search/physics?searchtype=author&query=Boutet%2C+S">Sebastien Boutet</a>, <a href="/search/physics?searchtype=author&query=Williams%2C+G">Garth Williams</a>, <a href="/search/physics?searchtype=author&query=Messerschmidt%2C+M">Marc Messerschmidt</a>, <a href="/search/physics?searchtype=author&query=Seibert%2C+M">Marvin Seibert</a>, <a href="/search/physics?searchtype=author&query=Moeller%2C+S">Stefan Moeller</a>, <a href="/search/physics?searchtype=author&query=Hastings%2C+J+B">Jerome B. Hastings</a>, <a href="/search/physics?searchtype=author&query=Reis%2C+D+A">David A. Reis</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="1502.00704v2-abstract-short" style="display: inline;"> X-ray scattering is a weak linear probe of matter. It is primarily sensitive to the position of electrons and their momentum distribution. Elastic X-ray scattering forms the basis of atomic structural determination while inelastic Compton scattering is often used as a spectroscopic probe of both single-particle excitations and collective modes. X-ray free-electron lasers (XFELs) are unique tools f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.00704v2-abstract-full').style.display = 'inline'; document.getElementById('1502.00704v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.00704v2-abstract-full" style="display: none;"> X-ray scattering is a weak linear probe of matter. It is primarily sensitive to the position of electrons and their momentum distribution. Elastic X-ray scattering forms the basis of atomic structural determination while inelastic Compton scattering is often used as a spectroscopic probe of both single-particle excitations and collective modes. X-ray free-electron lasers (XFELs) are unique tools for studying matter on its natural time and length scales due to their bright and coherent ultrashort pulses. However, in the focus of an XFEL the assumption of a weak linear probe breaks down, and nonlinear light-matter interactions can become ubiquitous. The field can be sufficiently high that even non-resonant multiphoton interactions at hard X-rays wavelengths become relevant. Here we report the observation of one of the most fundamental nonlinear X-ray-matter interactions, the simultaneous Compton scattering of two identical photons producing a single photon at nearly twice the photon energy. We measure scattered photons with an energy near 18 keV generated from solid beryllium irradiated by 8.8-9.75 keV XFEL pulses. The intensity in the X-ray focus reaches up to 4x20 W/cm2, which corresponds to a peak electric field two orders of magnitude higher than the atomic unit of field-strength and within four orders of magnitude of the quantum electrodynamic critical field. The observed signal scales quadratically in intensity and is emitted into a non-dipolar pattern, consistent with the simultaneous two-photon scattering from free electrons. However, the energy of the generated photons shows an anomalously large redshift only present at high intensities. This indicates that the instantaneous high-intensity scattering effectively interacts with a different electron momentum distribution than linear Compton scattering, with implications for the study of atomic-scale structure and dynamics of matter <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.00704v2-abstract-full').style.display = 'none'; document.getElementById('1502.00704v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1105.0037">arXiv:1105.0037</a> <span> [<a href="https://arxiv.org/pdf/1105.0037">pdf</a>, <a href="https://arxiv.org/ps/1105.0037">ps</a>, <a href="https://arxiv.org/format/1105.0037">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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/10.1007/s10751-011-0299-3">10.1007/s10751-011-0299-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Towards Antihydrogen Trapping and Spectroscopy at ALPHA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Butler%2C+E">Eoin Butler</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">Gorm. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">Mohammad. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">Marcelo Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">William Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">Paul D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">Crystal C. Bray</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">Claudio L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">Steven Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">Michael Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">Joel Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">Tim Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">David R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">Jeffrey S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">Walter N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ruyugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">Michael E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">Andrew J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">Richard Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">Svante Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">Leonid Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">Ricardo Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">Niels Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">Scott Menary</a> , et al. (15 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="1105.0037v1-abstract-short" style="display: inline;"> Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. We describe our techniques t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.0037v1-abstract-full').style.display = 'inline'; document.getElementById('1105.0037v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1105.0037v1-abstract-full" style="display: none;"> Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. We describe our techniques to directly measure the antiproton temperature and a new technique to cool them to below 10 K. We also show how our unique position-sensitive annihilation detector provides us with a highly sensitive method of identifying antiproton annihilations and effectively rejecting the cosmic-ray background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.0037v1-abstract-full').style.display = 'none'; document.getElementById('1105.0037v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">10 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/1104.4661">arXiv:1104.4661</a> <span> [<a href="https://arxiv.org/pdf/1104.4661">pdf</a>, <a href="https://arxiv.org/ps/1104.4661">ps</a>, <a href="https://arxiv.org/format/1104.4661">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</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="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Alpha Antihydrogen Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ALPHA+Collaboration"> ALPHA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">M. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">M. Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">C. C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a> , et al. (16 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="1104.4661v1-abstract-short" style="display: inline;"> ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our recent progress toward the initial goal of stable trapping of antihydrogen, with some emphasis on particle detection techniques. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.4661v1-abstract-full" style="display: none;"> ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our recent progress toward the initial goal of stable trapping of antihydrogen, with some emphasis on particle detection techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4661v1-abstract-full').style.display = 'none'; document.getElementById('1104.4661v1-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 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">Invited talk presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 2010</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proceedings of the Fifth Meeting on CPT and Lorentz Symmetry, Ed. V.A. Kostelecky, pp. 50-54, World Scientific (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1012.4110">arXiv:1012.4110</a> <span> [<a href="https://arxiv.org/pdf/1012.4110">pdf</a>, <a href="https://arxiv.org/ps/1012.4110">ps</a>, <a href="https://arxiv.org/format/1012.4110">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/10.1016/j.physletb.2010.11.004">10.1016/j.physletb.2010.11.004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search For Trapped Antihydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">Gorm B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">Mohammad D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">Marcelo Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">William Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">Paul D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">Crystal C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">Eoin Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">Claudio L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">Steven Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">Michael Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">Joel Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">Tim Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">David R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">Jeffrey S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">Walter N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">Michael E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">Andrew J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">Richard Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">Svante Jonsell</a>, <a href="/search/physics?searchtype=author&query=J%C3%B8rgensen%2C+L+V">Lars V. J酶rgensen</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">Lenoid Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">Ricardo Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">Niels Madsen</a> , et al. (17 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="1012.4110v1-abstract-short" style="display: inline;"> We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and reproducibly control the initial experimental param… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.4110v1-abstract-full').style.display = 'inline'; document.getElementById('1012.4110v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1012.4110v1-abstract-full" style="display: none;"> We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and reproducibly control the initial experimental parameters. The use of a position-sensitive annihilation vertex detector, together with the capability of controllably quenching the superconducting magnetic minimum trap, enabled us to carry out a high-sensitivity and low-background search for trapped synthesised antihydrogen atoms. We aim to identify the annihilations of antihydrogen atoms held for at least 130 ms in the trap before being released over ~30 ms. After a three-week experimental run in 2009 involving mixing of 10^7 antiprotons with 1.3 10^9 positrons to produce 6 10^5 antihydrogen atoms, we have identified six antiproton annihilation events that are consistent with the release of trapped antihydrogen. The cosmic ray background, estimated to contribute 0.14 counts, is incompatible with this observation at a significance of 5.6 sigma. Extensive simulations predict that an alternative source of annihilations, the escape of mirror-trapped antiprotons, is highly unlikely, though this possibility has not yet been ruled out experimentally. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.4110v1-abstract-full').style.display = 'none'; document.getElementById('1012.4110v1-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, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2010. </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">12 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 695 (2011) 95-104 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1002.3036">arXiv:1002.3036</a> <span> [<a href="https://arxiv.org/pdf/1002.3036">pdf</a>, <a href="https://arxiv.org/ps/1002.3036">ps</a>, <a href="https://arxiv.org/format/1002.3036">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="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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.physletb.2010.01.066">10.1016/j.physletb.2010.01.066 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antihydrogen formation dynamics in a multipolar neutral anti-atom trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=J%C3%B8rgensen%2C+L+V">L. V. J酶rgensen</a>, <a href="/search/physics?searchtype=author&query=Kerrigan%2C+S+J">S. J. Kerrigan</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</a>, <a href="/search/physics?searchtype=author&query=Olchanski%2C+K">K. Olchanski</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a> , et al. (11 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="1002.3036v1-abstract-short" style="display: inline;"> Antihydrogen production in a neutral atom trap formed by an octupole-based magnetic field minimum is demonstrated using field-ionization of weakly bound anti-atoms. Using our unique annihilation imaging detector, we correlate antihydrogen detection by imaging and by field-ionization for the first time. We further establish how field-ionization causes radial redistribution of the antiprotons duri… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3036v1-abstract-full').style.display = 'inline'; document.getElementById('1002.3036v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.3036v1-abstract-full" style="display: none;"> Antihydrogen production in a neutral atom trap formed by an octupole-based magnetic field minimum is demonstrated using field-ionization of weakly bound anti-atoms. Using our unique annihilation imaging detector, we correlate antihydrogen detection by imaging and by field-ionization for the first time. We further establish how field-ionization causes radial redistribution of the antiprotons during antihydrogen formation and use this effect for the first simultaneous measurements of strongly and weakly bound antihydrogen atoms. Distinguishing between these provides critical information needed in the process of optimizing for trappable antihydrogen. These observations are of crucial importance to the ultimate goal of performing CPT tests involving antihydrogen, which likely depends upon trapping the anti-atom. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3036v1-abstract-full').style.display = 'none'; document.getElementById('1002.3036v1-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> 16 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 685 (2010) 141 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0807.0074">arXiv:0807.0074</a> <span> [<a href="https://arxiv.org/pdf/0807.0074">pdf</a>, <a href="https://arxiv.org/ps/0807.0074">ps</a>, <a href="https://arxiv.org/format/0807.0074">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="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.2899305">10.1063/1.2899305 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A novel antiproton radial diagnostic based on octupole induced ballistic loss </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">C. C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Funakoshi%2C+R">R. Funakoshi</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jenkins%2C+M+J">M. J. Jenkins</a>, <a href="/search/physics?searchtype=author&query=Jorgensen%2C+L+V">L. V. Jorgensen</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</a>, <a href="/search/physics?searchtype=author&query=Olchanski%2C+K">K. Olchanski</a> , et al. (13 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="0807.0074v1-abstract-short" style="display: inline;"> We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of antiproton losses that occur as an octupole field in the antiproton confinement region is increased. We show several examples of how this diagnostic helps us to understand the radial dynamics of antiproton… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0074v1-abstract-full').style.display = 'inline'; document.getElementById('0807.0074v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0807.0074v1-abstract-full" style="display: none;"> We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of antiproton losses that occur as an octupole field in the antiproton confinement region is increased. We show several examples of how this diagnostic helps us to understand the radial dynamics of antiprotons in normal and nested Penning-Malmberg traps. Better understanding of these dynamics may aid current attempts to trap antihydrogen atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0074v1-abstract-full').style.display = 'none'; document.getElementById('0807.0074v1-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> 1 July, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Plasmas 15:032107,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0805.4082">arXiv:0805.4082</a> <span> [<a href="https://arxiv.org/pdf/0805.4082">pdf</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="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="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/10.1063/1.2977840">10.1063/1.2977840 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ALPHA+Collaboration"> ALPHA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">C. C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Funakoshi%2C+R">R. Funakoshi</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jenkins%2C+M+J">M. J. Jenkins</a>, <a href="/search/physics?searchtype=author&query=Jorgensen%2C+L+V">L. V. Jorgensen</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lai%2C+W">W. Lai</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a> , et al. (15 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="0805.4082v1-abstract-short" style="display: inline;"> We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive te… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.4082v1-abstract-full').style.display = 'inline'; document.getElementById('0805.4082v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0805.4082v1-abstract-full" style="display: none;"> We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive tests of CPT, possibly probing physics at the Planck Scale. We discuss some of the particle detection techniques used in ALPHA. Preliminary results from commissioning studies of a partial system of the ALPHA Si vertex detector are presented, the results of which highlight the power of annihilation vertex detection capability in antihydrogen studies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.4082v1-abstract-full').style.display = 'none'; document.getElementById('0805.4082v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2008. </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">Invited talk at Pbar08 - Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 2008. 14 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRIUMF Preprint: TRI-PP-08-01 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIP Conf.Proc.1037:208-220,2008 </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 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