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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.17892">arXiv:2501.17892</a> <span> [<a href="https://arxiv.org/pdf/2501.17892">pdf</a>, <a href="https://arxiv.org/format/2501.17892">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="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> Object Detection with Deep Learning for Rare Event Search in the GADGET II TPC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wheeler%2C+T">Tyler Wheeler</a>, <a href="/search/physics?searchtype=author&query=Ravishankar%2C+S">S. Ravishankar</a>, <a href="/search/physics?searchtype=author&query=Wrede%2C+C">C. Wrede</a>, <a href="/search/physics?searchtype=author&query=Andalib%2C+A">A. Andalib</a>, <a href="/search/physics?searchtype=author&query=Anthony%2C+A">A. Anthony</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Jain%2C+B">B. Jain</a>, <a href="/search/physics?searchtype=author&query=Jaros%2C+A">A. Jaros</a>, <a href="/search/physics?searchtype=author&query=Mahajan%2C+R">R. Mahajan</a>, <a href="/search/physics?searchtype=author&query=Schaedig%2C+L">L. Schaedig</a>, <a href="/search/physics?searchtype=author&query=Adams%2C+A">A. Adams</a>, <a href="/search/physics?searchtype=author&query=Ahn%2C+S">S. Ahn</a>, <a href="/search/physics?searchtype=author&query=Allmond%2C+J+M">J. M. Allmond</a>, <a href="/search/physics?searchtype=author&query=Bardayan%2C+D">D. Bardayan</a>, <a href="/search/physics?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/physics?searchtype=author&query=Bosmpotinis%2C+K">K. Bosmpotinis</a>, <a href="/search/physics?searchtype=author&query=Budner%2C+T">T. Budner</a>, <a href="/search/physics?searchtype=author&query=Carmichael%2C+S+R">S. R. Carmichael</a>, <a href="/search/physics?searchtype=author&query=Cha%2C+S+M">S. M. Cha</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+A">A. Chen</a>, <a href="/search/physics?searchtype=author&query=Chipps%2C+K+A">K. A. Chipps</a>, <a href="/search/physics?searchtype=author&query=Christie%2C+J+M">J. M. Christie</a>, <a href="/search/physics?searchtype=author&query=Cox%2C+I">I. Cox</a>, <a href="/search/physics?searchtype=author&query=Dopfer%2C+J">J. Dopfer</a>, <a href="/search/physics?searchtype=author&query=Friedman%2C+M">M. Friedman</a> , et al. (28 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="2501.17892v1-abstract-short" style="display: inline;"> In the pursuit of identifying rare two-particle events within the GADGET II Time Projection Chamber (TPC), this paper presents a comprehensive approach for leveraging Convolutional Neural Networks (CNNs) and various data processing methods. To address the inherent complexities of 3D TPC track reconstructions, the data is expressed in 2D projections and 1D quantities. This approach capitalizes on t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.17892v1-abstract-full').style.display = 'inline'; document.getElementById('2501.17892v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.17892v1-abstract-full" style="display: none;"> In the pursuit of identifying rare two-particle events within the GADGET II Time Projection Chamber (TPC), this paper presents a comprehensive approach for leveraging Convolutional Neural Networks (CNNs) and various data processing methods. To address the inherent complexities of 3D TPC track reconstructions, the data is expressed in 2D projections and 1D quantities. This approach capitalizes on the diverse data modalities of the TPC, allowing for the efficient representation of the distinct features of the 3D events, with no loss in topology uniqueness. Additionally, it leverages the computational efficiency of 2D CNNs and benefits from the extensive availability of pre-trained models. Given the scarcity of real training data for the rare events of interest, simulated events are used to train the models to detect real events. To account for potential distribution shifts when predominantly depending on simulations, significant perturbations are embedded within the simulations. This produces a broad parameter space that works to account for potential physics parameter and detector response variations and uncertainties. These parameter-varied simulations are used to train sensitive 2D CNN object detectors. When combined with 1D histogram peak detection algorithms, this multi-modal detection framework is highly adept at identifying rare, two-particle events in data taken during experiment 21072 at the Facility for Rare Isotope Beams (FRIB), demonstrating a 100% recall for events of interest. We present the methods and outcomes of our investigation and discuss the potential future applications of these techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.17892v1-abstract-full').style.display = 'none'; document.getElementById('2501.17892v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.01904">arXiv:2401.01904</a> <span> [<a href="https://arxiv.org/pdf/2401.01904">pdf</a>, <a href="https://arxiv.org/format/2401.01904">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 class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.110.035807">10.1103/PhysRevC.110.035807 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time Projection Chamber for GADGET II </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mahajan%2C+R">Ruchi Mahajan</a>, <a href="/search/physics?searchtype=author&query=Wheeler%2C+T">T. Wheeler</a>, <a href="/search/physics?searchtype=author&query=Pollacco%2C+E">E. Pollacco</a>, <a href="/search/physics?searchtype=author&query=Wrede%2C+C">C. Wrede</a>, <a href="/search/physics?searchtype=author&query=Adams%2C+A">A. Adams</a>, <a href="/search/physics?searchtype=author&query=Alvarez-Pol%2C+H">H. Alvarez-Pol</a>, <a href="/search/physics?searchtype=author&query=Andalib%2C+A">A. Andalib</a>, <a href="/search/physics?searchtype=author&query=Anthony%2C+A">A. Anthony</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/physics?searchtype=author&query=Budner%2C+T">T. Budner</a>, <a href="/search/physics?searchtype=author&query=Cortesi%2C+M">M. Cortesi</a>, <a href="/search/physics?searchtype=author&query=Dopfer%2C+J">J. Dopfer</a>, <a href="/search/physics?searchtype=author&query=Friedman%2C+M">M. Friedman</a>, <a href="/search/physics?searchtype=author&query=Jaros%2C+A">A. Jaros</a>, <a href="/search/physics?searchtype=author&query=Perez-Loureiro%2C+D">D. Perez-Loureiro</a>, <a href="/search/physics?searchtype=author&query=Mehl%2C+B">B. Mehl</a>, <a href="/search/physics?searchtype=author&query=De+Oliveira%2C+R">R. De Oliveira</a>, <a href="/search/physics?searchtype=author&query=Sun%2C+L+J">L. J. Sun</a>, <a href="/search/physics?searchtype=author&query=Surbrook%2C+J">J. Surbrook</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="2401.01904v1-abstract-short" style="display: inline;"> Background: The established GADGET detection system, designed for measuring weak, low-energy $尾$-delayed proton decays, features a gaseous Proton Detector with MICROMEGAS readout for calorimetric particle detection, surrounded by a Segmented Germanium Array for high-resolution prompt $纬$-ray detection. Purpose: To upgrade GADGET's Proton Detector to operate as a compact Time Projection Chamber (TP… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.01904v1-abstract-full').style.display = 'inline'; document.getElementById('2401.01904v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.01904v1-abstract-full" style="display: none;"> Background: The established GADGET detection system, designed for measuring weak, low-energy $尾$-delayed proton decays, features a gaseous Proton Detector with MICROMEGAS readout for calorimetric particle detection, surrounded by a Segmented Germanium Array for high-resolution prompt $纬$-ray detection. Purpose: To upgrade GADGET's Proton Detector to operate as a compact Time Projection Chamber (TPC) for the detection, 3D imaging and identification of low-energy $尾$-delayed single- and multi-particle emissions mainly of interest to astrophysical studies. Method: A new high granularity MM board with 1024 pads has been designed, fabricated, installed and tested. A high-density data acquisition system based on Generic Electronics for TPCs has been installed and optimized to record and process the gas avalanche signals collected on the readout pads. The TPC's performance has been tested using a $^{220}$Rn $伪$-particle source and cosmic-ray muons. In addition, decay events in the TPC have been simulated by adapting the ATTPCROOT data analysis framework. Further, a novel application of 2D convolutional neural networks for GADGET II event classification is introduced. Results: The GADGET II TPC is capable of detecting and identifying $伪$-particles, as well as measuring their track direction, range, and energy. It has also been demonstrated that the GADGET II TPC is capable of tracking cosmic-ray muons. In addition to being one of the first generation of micro pattern gaseous detectors to utilize a resistive anode applied to low-energy nuclear physics, the GADGET II TPC will also be the first TPC surrounded by a high-efficiency array of high-purity germanium $纬$-ray detectors. \textbf{Conclusions:} The TPC of GADGET II has been designed, fabricated, tested, and is ready for operation at the FRIB for radioactive beam-line experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.01904v1-abstract-full').style.display = 'none'; document.getElementById('2401.01904v1-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> 19 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.07199">arXiv:2309.07199</a> <span> [<a href="https://arxiv.org/pdf/2309.07199">pdf</a>, <a href="https://arxiv.org/format/2309.07199">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"> Kinematics reconstruction in solenoidal spectrometers operated in active target mode </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Yassid Ayyad</a>, <a href="/search/physics?searchtype=author&query=Anthony%2C+A+K">Adam K. Anthony</a>, <a href="/search/physics?searchtype=author&query=Bazin%2C+D">Daniel Bazin</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J">Jie Chen</a>, <a href="/search/physics?searchtype=author&query=Mittig%2C+W">Wolfgang Mittig</a>, <a href="/search/physics?searchtype=author&query=Kay%2C+B+P">Ben P. Kay</a>, <a href="/search/physics?searchtype=author&query=Sharp%2C+D+K">David K. Sharp</a>, <a href="/search/physics?searchtype=author&query=Zamora%2C+J+C">Juan Carlos Zamora</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="2309.07199v1-abstract-short" style="display: inline;"> We discuss the reconstruction of low-energy nuclear reaction kinematics from charged-particle tracks in solenoidal spectrometers working in Active Target Time Projection Chamber mode. In this operation mode, reaction products are tracked within the active gas medium of the Active Target with a three dimensional space point cloud. We have inferred the reaction kinematics from the point cloud using… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07199v1-abstract-full').style.display = 'inline'; document.getElementById('2309.07199v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.07199v1-abstract-full" style="display: none;"> We discuss the reconstruction of low-energy nuclear reaction kinematics from charged-particle tracks in solenoidal spectrometers working in Active Target Time Projection Chamber mode. In this operation mode, reaction products are tracked within the active gas medium of the Active Target with a three dimensional space point cloud. We have inferred the reaction kinematics from the point cloud using an algorithm based on a linear quadratic estimator (Kalman filter). The performance of this algorithm has been evaluated using experimental data from nuclear reactions measured with the Active Target Time Projection Chamber (AT-TPC) detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07199v1-abstract-full').style.display = 'none'; document.getElementById('2309.07199v1-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> 13 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.05914">arXiv:2203.05914</a> <span> [<a href="https://arxiv.org/pdf/2203.05914">pdf</a>, <a href="https://arxiv.org/format/2203.05914">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="Cosmology and Nongalactic Astrophysics">astro-ph.CO</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> </div> </div> <p class="title is-5 mathjax"> Recoil imaging for directional detection of dark matter, neutrinos, and physics beyond the Standard Model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=O%27Hare%2C+C+A+J">C. A. J. O'Hare</a>, <a href="/search/physics?searchtype=author&query=Loomba%2C+D">D. Loomba</a>, <a href="/search/physics?searchtype=author&query=Altenm%C3%BCller%2C+K">K. Altenm眉ller</a>, <a href="/search/physics?searchtype=author&query=%C3%81lvarez-Pol%2C+H">H. 脕lvarez-Pol</a>, <a href="/search/physics?searchtype=author&query=Amaro%2C+F+D">F. D. Amaro</a>, <a href="/search/physics?searchtype=author&query=Ara%C3%BAjo%2C+H+M">H. M. Ara煤jo</a>, <a href="/search/physics?searchtype=author&query=Sierra%2C+D+A">D. Aristizabal Sierra</a>, <a href="/search/physics?searchtype=author&query=Asaadi%2C+J">J. Asaadi</a>, <a href="/search/physics?searchtype=author&query=Atti%C3%A9%2C+D">D. Atti茅</a>, <a href="/search/physics?searchtype=author&query=Aune%2C+S">S. Aune</a>, <a href="/search/physics?searchtype=author&query=Awe%2C+C">C. Awe</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Barbeau%2C+P">P. Barbeau</a>, <a href="/search/physics?searchtype=author&query=Battat%2C+J+B+R">J. B. R. Battat</a>, <a href="/search/physics?searchtype=author&query=Bell%2C+N+F">N. F. Bell</a>, <a href="/search/physics?searchtype=author&query=Biasuzzi%2C+B">B. Biasuzzi</a>, <a href="/search/physics?searchtype=author&query=Bignell%2C+L+J">L. J. Bignell</a>, <a href="/search/physics?searchtype=author&query=Boehm%2C+C">C. Boehm</a>, <a href="/search/physics?searchtype=author&query=Bolognino%2C+I">I. Bolognino</a>, <a href="/search/physics?searchtype=author&query=Brunbauer%2C+F+M">F. M. Brunbauer</a>, <a href="/search/physics?searchtype=author&query=Caama%C3%B1o%2C+M">M. Caama帽o</a>, <a href="/search/physics?searchtype=author&query=Cabo%2C+C">C. Cabo</a>, <a href="/search/physics?searchtype=author&query=Caratelli%2C+D">D. Caratelli</a>, <a href="/search/physics?searchtype=author&query=Carmona%2C+J+M">J. M. Carmona</a> , et al. (142 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.05914v3-abstract-short" style="display: inline;"> Recoil imaging entails the detection of spatially resolved ionization tracks generated by particle interactions. This is a highly sought-after capability in many classes of detector, with broad applications across particle and astroparticle physics. However, at low energies, where ionization signatures are small in size, recoil imaging only seems to be a practical goal for micro-pattern gas detect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05914v3-abstract-full').style.display = 'inline'; document.getElementById('2203.05914v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.05914v3-abstract-full" style="display: none;"> Recoil imaging entails the detection of spatially resolved ionization tracks generated by particle interactions. This is a highly sought-after capability in many classes of detector, with broad applications across particle and astroparticle physics. However, at low energies, where ionization signatures are small in size, recoil imaging only seems to be a practical goal for micro-pattern gas detectors. This white paper outlines the physics case for recoil imaging, and puts forward a decadal plan to advance towards the directional detection of low-energy recoils with sensitivity and resolution close to fundamental performance limits. The science case covered includes: the discovery of dark matter into the neutrino fog, directional detection of sub-MeV solar neutrinos, the precision study of coherent-elastic neutrino-nucleus scattering, the detection of solar axions, the measurement of the Migdal effect, X-ray polarimetry, and several other applied physics goals. We also outline the R&D programs necessary to test concepts that are crucial to advance detector performance towards their fundamental limit: single primary electron sensitivity with full 3D spatial resolution at the $\sim$100 micron-scale. These advancements include: the use of negative ion drift, electron counting with high-definition electronic readout, time projection chambers with optical readout, and the possibility for nuclear recoil tracking in high-density gases such as argon. We also discuss the readout and electronics systems needed to scale-up such detectors to the ton-scale and beyond. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05914v3-abstract-full').style.display = 'none'; document.getElementById('2203.05914v3-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">77 pages, 20 figures. Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.01981">arXiv:2202.01981</a> <span> [<a href="https://arxiv.org/pdf/2202.01981">pdf</a>, <a href="https://arxiv.org/format/2202.01981">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="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2022.166612">10.1016/j.nima.2022.166612 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-flight production of an isomeric beam of $^{16}$N </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hoffman%2C+C+R">C. R. Hoffman</a>, <a href="/search/physics?searchtype=author&query=Tang%2C+T+L">T. L. Tang</a>, <a href="/search/physics?searchtype=author&query=Avila%2C+M">M. Avila</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+W">K. W. Brown</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/physics?searchtype=author&query=Chipps%2C+K+A">K. A. Chipps</a>, <a href="/search/physics?searchtype=author&query=Jayatissa%2C+H">H. Jayatissa</a>, <a href="/search/physics?searchtype=author&query=Kay%2C+B+P">B. P. Kay</a>, <a href="/search/physics?searchtype=author&query=M%C3%BCller-Gatermann%2C+C">C. M眉ller-Gatermann</a>, <a href="/search/physics?searchtype=author&query=Ong%2C+H+J">H. J. Ong</a>, <a href="/search/physics?searchtype=author&query=Song%2C+J">J. Song</a>, <a href="/search/physics?searchtype=author&query=Wilson%2C+G+L">G. L. Wilson</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="2202.01981v2-abstract-short" style="display: inline;"> An in-flight beam of $^{16}$N was produced via the single-neutron adding ($d$,$p$) reaction in inverse kinematics at the recently upgraded Argonne Tandem Linear Accelerator System (ATLAS) in-flight system. The amount of the $^{16}$N beam which resided in its excited 0.120-MeV $J^蟺=0^-$ isomeric state (T$_{1/2}\approx5$ $渭$s) was determined to be 40(5)% at a reaction energy of 7.9(3) MeV/$u$, and 2… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.01981v2-abstract-full').style.display = 'inline'; document.getElementById('2202.01981v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.01981v2-abstract-full" style="display: none;"> An in-flight beam of $^{16}$N was produced via the single-neutron adding ($d$,$p$) reaction in inverse kinematics at the recently upgraded Argonne Tandem Linear Accelerator System (ATLAS) in-flight system. The amount of the $^{16}$N beam which resided in its excited 0.120-MeV $J^蟺=0^-$ isomeric state (T$_{1/2}\approx5$ $渭$s) was determined to be 40(5)% at a reaction energy of 7.9(3) MeV/$u$, and 24(2)% at a reaction energy of 13.2(2) MeV/$u$. The isomer measurements took place at an experimental station $\approx30$ m downstream of the production target and utilized an Al beam-stopping foil and a HPGe Clover detector. Composite $^{16}$N beam rate determinations were made at the experimental station and the focal plane of the Argonne in-flight radioactive ion-beam separator (RAISOR) with Si $螖$E-E telescopes. A Distorted Wave Born Approximation (DWBA) approach was coupled with the known spectroscopic information on $^{16}$N in order to estimate the relative $^{16}$N isomer yields and composite $^{16}$N beam rates. In addition to the observed reaction-energy dependence of the isomer fraction, a large sensitivity to angular acceptance of the recoils was also observed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.01981v2-abstract-full').style.display = 'none'; document.getElementById('2202.01981v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">21 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.13503">arXiv:2107.13503</a> <span> [<a href="https://arxiv.org/pdf/2107.13503">pdf</a>, <a href="https://arxiv.org/format/2107.13503">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 class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0068180">10.1063/5.0068180 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam Particle Identification and Tagging of Incompletely Stripped Heavy Beams with HEIST </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Anthony%2C+A+K">A. K. Anthony</a>, <a href="/search/physics?searchtype=author&query=Niu%2C+C+Y">C. Y. Niu</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+R+S">R. S. Wang</a>, <a href="/search/physics?searchtype=author&query=Wieske%2C+J">J. Wieske</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+W">K. W. Brown</a>, <a href="/search/physics?searchtype=author&query=Chajecki%2C+Z">Z. Chajecki</a>, <a href="/search/physics?searchtype=author&query=Lynch%2C+W+G">W. G. Lynch</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Barney%2C+J">J. Barney</a>, <a href="/search/physics?searchtype=author&query=Baumann%2C+T">T. Baumann</a>, <a href="/search/physics?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/physics?searchtype=author&query=Beceiro-Novo%2C+S">S. Beceiro-Novo</a>, <a href="/search/physics?searchtype=author&query=Boza%2C+J">J. Boza</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J">J. Chen</a>, <a href="/search/physics?searchtype=author&query=Cook%2C+K+J">K. J. Cook</a>, <a href="/search/physics?searchtype=author&query=Cortesi%2C+M">M. Cortesi</a>, <a href="/search/physics?searchtype=author&query=Ginter%2C+T">T. Ginter</a>, <a href="/search/physics?searchtype=author&query=Mittig%2C+W">W. Mittig</a>, <a href="/search/physics?searchtype=author&query=Pype%2C+A">A. Pype</a>, <a href="/search/physics?searchtype=author&query=Smith%2C+M+K">M. K. Smith</a>, <a href="/search/physics?searchtype=author&query=Soto%2C+C">C. Soto</a>, <a href="/search/physics?searchtype=author&query=Sumithrarachchi%2C+C">C. Sumithrarachchi</a>, <a href="/search/physics?searchtype=author&query=Swaim%2C+J">J. Swaim</a>, <a href="/search/physics?searchtype=author&query=Sweany%2C+S">S. Sweany</a>, <a href="/search/physics?searchtype=author&query=Teh%2C+F+C+E">F. C. E. Teh</a> , et al. (4 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="2107.13503v3-abstract-short" style="display: inline;"> A challenge preventing successful inverse kinematics measurements with heavy nuclei that are not fully stripped is identifying and tagging the beam particles. For this purpose, the HEavy ISotope Tagger (HEIST) has been developed. HEIST utilizes two micro-channel plate timing detectors to measure time of flight, a multi-sampling ion chamber to measure energy loss, and a high purity Ge detector to i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.13503v3-abstract-full').style.display = 'inline'; document.getElementById('2107.13503v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.13503v3-abstract-full" style="display: none;"> A challenge preventing successful inverse kinematics measurements with heavy nuclei that are not fully stripped is identifying and tagging the beam particles. For this purpose, the HEavy ISotope Tagger (HEIST) has been developed. HEIST utilizes two micro-channel plate timing detectors to measure time of flight, a multi-sampling ion chamber to measure energy loss, and a high purity Ge detector to identify isomer decays and calibrate the isotope identification system. HEIST has successfully identified $^{198}$Pb and other nearby nuclei at energies of about 75 MeV/A. In the experiment discussed, a typical cut containing 89\% of all $^{198}$Pb$^{+80}$ in the beam had a purity of 86\%. We examine the issues of charge state contamination. The observed charge state populations of these ions are presented and are moderately well described by the charge state model GLOBAL. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.13503v3-abstract-full').style.display = 'none'; document.getElementById('2107.13503v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">The following article has been submitted to Review of Scientific Instruments</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.04273">arXiv:1912.04273</a> <span> [<a href="https://arxiv.org/pdf/1912.04273">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/15/03/P03025">10.1088/1748-0221/15/03/P03025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of a novel MPGD-based drift chamber for the NSCL/FRIB S800 spectrometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cortesi%2C+M">M. Cortesi</a>, <a href="/search/physics?searchtype=author&query=Pereira%2C+J">J. Pereira</a>, <a href="/search/physics?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Cerizza%2C+G">G. Cerizza</a>, <a href="/search/physics?searchtype=author&query=Fox%2C+R">R. Fox</a>, <a href="/search/physics?searchtype=author&query=Zegers%2C+R+G+T">R. G. T. Zegers</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="1912.04273v1-abstract-short" style="display: inline;"> The performance of a novel tracking detector developed for the focal plane of the NSCL/FRIB S800 magnetic spectrometer is presented. The detector comprises a large-area drift chamber equipped with a hybrid Micro-Pattern Gaseous Detector (MPGD)-based readout. The latter consists of a position-sensitive Micromegas detector preceded by a two-layer M-THGEM multiplier as a pre-amplification stage. The… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.04273v1-abstract-full').style.display = 'inline'; document.getElementById('1912.04273v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.04273v1-abstract-full" style="display: none;"> The performance of a novel tracking detector developed for the focal plane of the NSCL/FRIB S800 magnetic spectrometer is presented. The detector comprises a large-area drift chamber equipped with a hybrid Micro-Pattern Gaseous Detector (MPGD)-based readout. The latter consists of a position-sensitive Micromegas detector preceded by a two-layer M-THGEM multiplier as a pre-amplification stage. The signals from the Micromegas readout are processed by a data acquisition system based on the General Electronics for TPC (GET). The drift chamber has an effective area of around 60x30 cm^2, which matches to the very large acceptance of the S800 spectrometer. This work discusses in detail the results of performance evaluation tests carried out with a low-energy alpha-particles source and with high-energy heavy-ion beams with the detector installed at the S800 focal plane. In this latter case, the detector was irradiated with a 150 MeV/u 78Kr36+ beam as well as a heavy-ion fragmentation cocktail beam produced by the 78Kr36+ beam impinging on a thin beryllium target. Sub-millimeter position resolution is obtained in both dispersive and non-dispersive directions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.04273v1-abstract-full').style.display = 'none'; document.getElementById('1912.04273v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 13 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/1907.06710">arXiv:1907.06710</a> <span> [<a href="https://arxiv.org/pdf/1907.06710">pdf</a>, <a href="https://arxiv.org/format/1907.06710">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 class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2019.162830">10.1016/j.nima.2019.162830 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beam induced space-charge effects in Time Projection Chambers in low-energy nuclear physics experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Randhawa%2C+J+S">J. S. Randhawa</a>, <a href="/search/physics?searchtype=author&query=Cortesi%2C+M">M. Cortesi</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Mittig%2C+W">W. Mittig</a>, <a href="/search/physics?searchtype=author&query=Ahn%2C+T">T. Ahn</a>, <a href="/search/physics?searchtype=author&query=Bazin%2C+D">D. Bazin</a>, <a href="/search/physics?searchtype=author&query=Beceiro-Novo%2C+S">S. Beceiro-Novo</a>, <a href="/search/physics?searchtype=author&query=Carpenter%2C+L">L. Carpenter</a>, <a href="/search/physics?searchtype=author&query=Cook%2C+K+J">K. J. Cook</a>, <a href="/search/physics?searchtype=author&query=Dasgupta%2C+M">M. Dasgupta</a>, <a href="/search/physics?searchtype=author&query=Henderson%2C+S">S. Henderson</a>, <a href="/search/physics?searchtype=author&query=Hinde%2C+D+J">D. J. Hinde</a>, <a href="/search/physics?searchtype=author&query=Kolata%2C+J+J">J. J. Kolata</a>, <a href="/search/physics?searchtype=author&query=Sammut%2C+J">J. Sammut</a>, <a href="/search/physics?searchtype=author&query=Santamaria%2C+C">C. Santamaria</a>, <a href="/search/physics?searchtype=author&query=Watwood%2C+N">N. Watwood</a>, <a href="/search/physics?searchtype=author&query=Yeck%2C+A">A. Yeck</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="1907.06710v2-abstract-short" style="display: inline;"> Tracking capabilities in Time Projection Chambers (TPCs) are strongly dictated by the homogeneity of the drift field. Ion back-flow in various gas detectors, mainly induced by the secondary ionization processes during amplification, has long been known as a source of drift field distortion. Here, we report on beam-induced space-charge effects from the primary ionization process in the drift region… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06710v2-abstract-full').style.display = 'inline'; document.getElementById('1907.06710v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.06710v2-abstract-full" style="display: none;"> Tracking capabilities in Time Projection Chambers (TPCs) are strongly dictated by the homogeneity of the drift field. Ion back-flow in various gas detectors, mainly induced by the secondary ionization processes during amplification, has long been known as a source of drift field distortion. Here, we report on beam-induced space-charge effects from the primary ionization process in the drift region in low-energy nuclear physics experiment with Active Target Time Projection Chamber (AT-TPC). A qualitative explanation of the observed effects is provided using detailed electron transport simulations. As ion mobility is a crucial factor in the space-charge effects, the need for a careful optimization of gas properties is highlighted. The impact of track distortion on tracking algorithm performance is also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.06710v2-abstract-full').style.display = 'none'; document.getElementById('1907.06710v2-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 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.02287">arXiv:1809.02287</a> <span> [<a href="https://arxiv.org/pdf/1809.02287">pdf</a>, <a href="https://arxiv.org/format/1809.02287">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2018.08.042">10.1016/j.nima.2018.08.042 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance test of the MAIKo active target </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Furuno%2C+T">T. Furuno</a>, <a href="/search/physics?searchtype=author&query=Kawabata%2C+T">T. Kawabata</a>, <a href="/search/physics?searchtype=author&query=Ong%2C+H+J">H. J. Ong</a>, <a href="/search/physics?searchtype=author&query=Adachi%2C+S">S. Adachi</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Baba%2C+T">T. Baba</a>, <a href="/search/physics?searchtype=author&query=Fujikawa%2C+Y">Y. Fujikawa</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a>, <a href="/search/physics?searchtype=author&query=Inaba%2C+K">K. Inaba</a>, <a href="/search/physics?searchtype=author&query=Ishii%2C+Y">Y. Ishii</a>, <a href="/search/physics?searchtype=author&query=Kabuki%2C+S">S. Kabuki</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">H. Kubo</a>, <a href="/search/physics?searchtype=author&query=Matsuda%2C+Y">Y. Matsuda</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Y. Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">T. Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Morimoto%2C+T">T. Morimoto</a>, <a href="/search/physics?searchtype=author&query=Murata%2C+M">M. Murata</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">T. Sawano</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+T">T. Suzuki</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">A. Takada</a>, <a href="/search/physics?searchtype=author&query=Tanaka%2C+J">J. Tanaka</a>, <a href="/search/physics?searchtype=author&query=Tanihata%2C+I">I. Tanihata</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">T. Tanimori</a>, <a href="/search/physics?searchtype=author&query=Tran%2C+D+T">D. T. Tran</a>, <a href="/search/physics?searchtype=author&query=Tsumura%2C+M">M. Tsumura</a> , et al. (1 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="1809.02287v1-abstract-short" style="display: inline;"> A new active target named MAIKo (Mu-PIC based Active target for Inverse Kinematics$_{\circ}$) has been developed at Kyoto University and Research Center for Nuclear Physics (RCNP), Osaka University. MAIKo is suited for missing-mass spectroscopy of unstable nuclei at forward scattering angles in inverse kinematics. MAIKo consists of a time projection chamber (TPC), which incorporates a micro-pixel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02287v1-abstract-full').style.display = 'inline'; document.getElementById('1809.02287v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.02287v1-abstract-full" style="display: none;"> A new active target named MAIKo (Mu-PIC based Active target for Inverse Kinematics$_{\circ}$) has been developed at Kyoto University and Research Center for Nuclear Physics (RCNP), Osaka University. MAIKo is suited for missing-mass spectroscopy of unstable nuclei at forward scattering angles in inverse kinematics. MAIKo consists of a time projection chamber (TPC), which incorporates a micro-pixel chamber ($渭$-PIC) as the electron multiplication and collection system. In MAIKo, the medium gas also plays the role of a reaction target, thus allowing detection of low-energy recoil particles with high position resolution. The MAIKo TPC was commissioned with He(93%)+iso-C$_{4}$H$_{10}$(7%) and He(93%)+CO$_{2}$(7%) mixture gasses at 430 hPa. The gas gain and the angular resolution of MAIKo were evaluated with an alpha source and a $^{4}$He beam at 56 MeV. The TPC was stably operated up to 1000-kcps beam intensity. A tracking algorithm using the Hough transform method has been developed to analyze scattering events. An angular resolution of 1.3$^{\circ}$ was achieved for scattered $^{4}$He particles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02287v1-abstract-full').style.display = 'none'; document.getElementById('1809.02287v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods in Physics Research Section A 908, 215-224 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.03513">arXiv:1807.03513</a> <span> [<a href="https://arxiv.org/pdf/1807.03513">pdf</a>, <a href="https://arxiv.org/format/1807.03513">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="Machine Learning">stat.ML</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.cpc.2018.09.010">10.1016/j.cpc.2018.09.010 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Automatic trajectory recognition in Active Target Time Projection Chambers data by means of hierarchical clustering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dalitz%2C+C">Christoph Dalitz</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Yassid Ayyad</a>, <a href="/search/physics?searchtype=author&query=Wilberg%2C+J">Jens Wilberg</a>, <a href="/search/physics?searchtype=author&query=Aymans%2C+L">Lukas Aymans</a>, <a href="/search/physics?searchtype=author&query=Bazin%2C+D">Daniel Bazin</a>, <a href="/search/physics?searchtype=author&query=Mittig%2C+W">Wolfgang Mittig</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="1807.03513v3-abstract-short" style="display: inline;"> The automatic reconstruction of three-dimensional particle tracks from Active Target Time Projection Chambers data can be a challenging task, especially in the presence of noise. In this article, we propose a non-parametric algorithm that is based on the idea of clustering point triplets instead of the original points. We define an appropriate distance measure on point triplets and then apply a si… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.03513v3-abstract-full').style.display = 'inline'; document.getElementById('1807.03513v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.03513v3-abstract-full" style="display: none;"> The automatic reconstruction of three-dimensional particle tracks from Active Target Time Projection Chambers data can be a challenging task, especially in the presence of noise. In this article, we propose a non-parametric algorithm that is based on the idea of clustering point triplets instead of the original points. We define an appropriate distance measure on point triplets and then apply a single-link hierarchical clustering on the triplets. Compared to parametric approaches like RANSAC or the Hough transform, the new algorithm has the advantage of potentially finding trajectories even of shapes that are not known beforehand. This feature is particularly important in low-energy nuclear physics experiments with Active Targets operating inside a magnetic field. The algorithm has been validated using data from experiments performed with the Active Target Time Projection Chamber developed at the National Superconducting Cyclotron Laboratory (NSCL).The results demonstrate the capability of the algorithm to identify and isolate particle tracks that describe non-analytical trajectories. For curved tracks, the vertex detection recall was 86\% and the precision 94\%. For straight tracks, the vertex detection recall was 96\% and the precision 98\%. In the case of a test set containing only straight linear tracks, the algorithm performed better than an iterative Hough transform. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.03513v3-abstract-full').style.display = 'none'; document.getElementById('1807.03513v3-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 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages; fixed up references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Computer Physics Communications 235 (2019) 159-168 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 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