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</div> <div class="control"> <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/2211.09838">arXiv:2211.09838</a> <span> [<a href="https://arxiv.org/pdf/2211.09838">pdf</a>, <a href="https://arxiv.org/format/2211.09838">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevAccelBeams.26.040101">10.1103/PhysRevAccelBeams.26.040101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design and Performance of a Novel Low Energy Multi-Species Beamline for the ALPHA Antihydrogen Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baker%2C+C+J">C. J. Baker</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Capra%2C+A">A. Capra</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Christensen%2C+A+J">A. J. Christensen</a>, <a href="/search/physics?searchtype=author&query=Collister%2C+R">R. Collister</a>, <a href="/search/physics?searchtype=author&query=Mathad%2C+A+C">A. Cridland Mathad</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</a>, <a href="/search/physics?searchtype=author&query=Evans%2C+A">A. Evans</a>, <a href="/search/physics?searchtype=author&query=Evetts%2C+N">N. Evetts</a>, <a href="/search/physics?searchtype=author&query=Fabbri%2C+S">S. Fabbri</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=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=Grandemange%2C+P">P. Grandemange</a>, <a href="/search/physics?searchtype=author&query=Granum%2C+P">P. Granum</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Hodgkinson%2C+D">D. Hodgkinson</a>, <a href="/search/physics?searchtype=author&query=Isaac%2C+C+A">C. A. Isaac</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+M+A">M. A. Johnson</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+J+M">J. M. Jones</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+S+A">S. A. Jones</a> , et al. (25 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="2211.09838v1-abstract-short" style="display: inline;"> The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. Using… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09838v1-abstract-full').style.display = 'inline'; document.getElementById('2211.09838v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.09838v1-abstract-full" style="display: none;"> The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. Using experimental measurements taken during the initial commissioning of the instrument, we evaluate its performance and validate the models used for its development. By combining data from a range of sources, we show that the beamline has a high transfer efficiency, and estimate that the percentage of particles captured in the experiments from each bunch is (78 $\pm$ 3)% for up to $10^{5}$ antiprotons, and (71 $\pm$ 5)% for bunches of up to $10^{7}$ positrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09838v1-abstract-full').style.display = 'none'; document.getElementById('2211.09838v1-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 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">15 pages, 15 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/2107.08152">arXiv:2107.08152</a> <span> [<a href="https://arxiv.org/pdf/2107.08152">pdf</a>, <a href="https://arxiv.org/format/2107.08152">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/10.1007/s10751-016-1382-6">10.1007/s10751-016-1382-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limit on the Electric Charge of Antihydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Capra%2C+A">A. Capra</a>, <a href="/search/physics?searchtype=author&query=Amole%2C+C">C. Amole</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=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=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</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=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=Gutierrez%2C+A">A. Gutierrez</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=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Isaac%2C+C+A">C. A. Isaac</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=Little%2C+A">A. Little</a>, <a href="/search/physics?searchtype=author&query=McKenna%2C+J+T+K">J. T. K. McKenna</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</a>, <a href="/search/physics?searchtype=author&query=Napoli%2C+S+C">S. C. Napoli</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</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="2107.08152v1-abstract-short" style="display: inline;"> The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. Charge neutrality of matter is known to a very high precision, hence a neutrality limit of $\overline{\mathrm{H}}$ provides a test of CPT invarianc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.08152v1-abstract-full').style.display = 'inline'; document.getElementById('2107.08152v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.08152v1-abstract-full" style="display: none;"> The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. Charge neutrality of matter is known to a very high precision, hence a neutrality limit of $\overline{\mathrm{H}}$ provides a test of CPT invariance. The experimental technique is based on the measurement of the deflection of putatively charged $\overline{\mathrm{H}}$ in an electric field. The tendency for trapped $\overline{\mathrm{H}}$ atoms to be displaced by electrostatic fields is measured and compared to the results of a detailed simulation of $\overline{\mathrm{H}}$ dynamics in the trap. An extensive survey of the systematic errors is performed, with particular attention to those due to the silicon vertex detector, which is the device used to determine the $\overline{\mathrm{H}}$ annihilation position. The limit obtained on the charge of the $\overline{\mathrm{H}}$ atom is \mbox{$ Q = (-1.3\pm1.8\pm0.4)\times10^{-8}$}, representing the first precision measurement with $\overline{\mathrm{H}}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.08152v1-abstract-full').style.display = 'none'; document.getElementById('2107.08152v1-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, 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">5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Hyperfine Interact 238, 9 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.06656">arXiv:1609.06656</a> <span> [<a href="https://arxiv.org/pdf/1609.06656">pdf</a>, <a href="https://arxiv.org/format/1609.06656">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Design of a Radial TPC for Antihydrogen Gravity Measurement with ALPHA-g </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Capra%2C+A">Andrea Capra</a>, <a href="/search/physics?searchtype=author&query=Amaudruz%2C+P">Pierre-Andr茅 Amaudruz</a>, <a href="/search/physics?searchtype=author&query=Bishop%2C+D">Daryl Bishop</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Freeman%2C+S">Skyler Freeman</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D">David Gill</a>, <a href="/search/physics?searchtype=author&query=Grant%2C+M">Matthew Grant</a>, <a href="/search/physics?searchtype=author&query=Henderson%2C+R">Robert Henderson</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">Leonid Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+P">Philip Lu</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">Scott Menary</a>, <a href="/search/physics?searchtype=author&query=Olchanski%2C+K">Konstantin Olchanski</a>, <a href="/search/physics?searchtype=author&query=Retiere%2C+F">Fabrice Retiere</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="1609.06656v1-abstract-short" style="display: inline;"> The gravitational interaction of antimatter and matter has never been directly probed. ALPHA-g is a novel experiment that aims to perform the first measurement of the antihydrogen gravitational mass. A fundamental requirement for this new apparatus is a position sensitive particle detector around the antihydrogen trap which provides information about antihydrogen annihilation location. The propose… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06656v1-abstract-full').style.display = 'inline'; document.getElementById('1609.06656v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.06656v1-abstract-full" style="display: none;"> The gravitational interaction of antimatter and matter has never been directly probed. ALPHA-g is a novel experiment that aims to perform the first measurement of the antihydrogen gravitational mass. A fundamental requirement for this new apparatus is a position sensitive particle detector around the antihydrogen trap which provides information about antihydrogen annihilation location. The proposed detector is a radial Time Projection Chamber, or \textit{rTPC}, whose concept is being developed at TRIUMF. A simulation of the detector and the development of the reconstruction software, used to determine the antihydrogen annihilation point, is presented alongside with the expected performance of the rTPC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06656v1-abstract-full').style.display = 'none'; document.getElementById('1609.06656v1-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 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures, LEAP2016</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.0692">arXiv:1405.0692</a> <span> [<a href="https://arxiv.org/pdf/1405.0692">pdf</a>, <a href="https://arxiv.org/ps/1405.0692">ps</a>, <a href="https://arxiv.org/format/1405.0692">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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/10.1088/1367-2630/16/1/013037">10.1088/1367-2630/16/1/013037 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In situ electromagnetic field diagnostics with an electron plasma in a Penning-Malmberg trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amole%2C+C">C. Amole</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=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Capra%2C+A">A. Capra</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Deller%2C+A">A. Deller</a>, <a href="/search/physics?searchtype=author&query=Evetts%2C+N">N. Evetts</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</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=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=Gutierrez%2C+A">A. Gutierrez</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=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Isaac%2C+C+A">C. A. Isaac</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=Little%2C+A">A. Little</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=McKenna%2C+J+T+K">J. T. K. McKenna</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="1405.0692v1-abstract-short" style="display: inline;"> We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the electron plasma is used as an in situ diagnostic tool for measurement of the static magnetic field and the microwave electric field in the trap. The cyclotron motion of the electron plasma is excited by microwave radiation and the temperature chan… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.0692v1-abstract-full').style.display = 'inline'; document.getElementById('1405.0692v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.0692v1-abstract-full" style="display: none;"> We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the electron plasma is used as an in situ diagnostic tool for measurement of the static magnetic field and the microwave electric field in the trap. The cyclotron motion of the electron plasma is excited by microwave radiation and the temperature change of the plasma is measured non-destructively by monitoring the plasma's quadrupole mode frequency. The spatially-resolved microwave electric field strength can be inferred from the plasma temperature change and the magnetic field is found through the cyclotron resonance frequency. These measurements were used extensively in the recently reported demonstration of resonant quantum interactions with antihydrogen. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.0692v1-abstract-full').style.display = 'none'; document.getElementById('1405.0692v1-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> 4 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 16 013037 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1309.7468">arXiv:1309.7468</a> <span> [<a href="https://arxiv.org/pdf/1309.7468">pdf</a>, <a href="https://arxiv.org/ps/1309.7468">ps</a>, <a href="https://arxiv.org/format/1309.7468">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 - Phenomenology">hep-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="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/10.1142/9789814566438_0002">10.1142/9789814566438_0002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antihydrogen, CPT, and Naturalness </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</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="1309.7468v1-abstract-short" style="display: inline;"> Studying fundamental symmetries of Nature has proven fruitful in particle physics. I argue that recent results at the LHC, and the naturalness problem highlighted by them, provide a renewed motivation for tests of CPT symmetry as a probe for physics beyond quantum field theory. I also discuss prospects for antihydrogen CPT tests with sensitivities to Planck scale suppressed effects. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1309.7468v1-abstract-full" style="display: none;"> Studying fundamental symmetries of Nature has proven fruitful in particle physics. I argue that recent results at the LHC, and the naturalness problem highlighted by them, provide a renewed motivation for tests of CPT symmetry as a probe for physics beyond quantum field theory. I also discuss prospects for antihydrogen CPT tests with sensitivities to Planck scale suppressed effects. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.7468v1-abstract-full').style.display = 'none'; document.getElementById('1309.7468v1-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 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Based on an invited talk at CPT'13 -- the Sixth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 17-21, 2013</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1210.6103">arXiv:1210.6103</a> <span> [<a href="https://arxiv.org/pdf/1210.6103">pdf</a>, <a href="https://arxiv.org/ps/1210.6103">ps</a>, <a href="https://arxiv.org/format/1210.6103">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="Nuclear Experiment">nucl-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/10.1088/0953-4075/46/2/025302">10.1088/0953-4075/46/2/025302 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A proposal for laser cooling antihydrogen atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Donnan%2C+P+H">P. H. Donnan</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Robicheaux%2C+F">F. Robicheaux</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="1210.6103v1-abstract-short" style="display: inline;"> We present a scheme for laser cooling applicable for an extremely dilute sample of magnetically trapped antihydrogen atoms($\bar{H}$). Exploiting and controlling the dynamical coupling between the $\bar{H}$'s motional degrees of freedom in a magnetic trap, three-dimensional cooling can be achieved from Doppler cooling on one dimension using the $1s_{1/2}-2p_{3/2}$ transition. The lack of three-dim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.6103v1-abstract-full').style.display = 'inline'; document.getElementById('1210.6103v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1210.6103v1-abstract-full" style="display: none;"> We present a scheme for laser cooling applicable for an extremely dilute sample of magnetically trapped antihydrogen atoms($\bar{H}$). Exploiting and controlling the dynamical coupling between the $\bar{H}$'s motional degrees of freedom in a magnetic trap, three-dimensional cooling can be achieved from Doppler cooling on one dimension using the $1s_{1/2}-2p_{3/2}$ transition. The lack of three-dimensional access to the trapped $\bar{H}$ and the nearly separable nature of the trapping potential leads to difficulties in cooling. Using realistic models for the spatial variation of the magnetic fields, we find that it should be possible to cool the $\bar{H}$'s to $\sim 20$ mK even with these constraints. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.6103v1-abstract-full').style.display = 'none'; document.getElementById('1210.6103v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2012. </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">17 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Physics B 46, 025302 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.3944">arXiv:1201.3944</a> <span> [<a href="https://arxiv.org/pdf/1201.3944">pdf</a>, <a href="https://arxiv.org/format/1201.3944">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="Nuclear Experiment">nucl-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/10.1088/1367-2630/14/1/015010.">10.1088/1367-2630/14/1/015010. <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antihydrogen and mirror-trapped antiproton discrimination: Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amole%2C+C">C. Amole</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=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=Deller%2C+A">A. Deller</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</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=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=Gutierrez%2C+A">A. Gutierrez</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=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=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</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="1201.3944v1-abstract-short" style="display: inline;"> Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were detected by rapidly turning off these magnets, thereby eliminating the magnetic minimum and releasing any antiatoms contained in the trap. Once released, these antiatoms quickly hit the trap wall, whereupon the positrons and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.3944v1-abstract-full').style.display = 'inline'; document.getElementById('1201.3944v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.3944v1-abstract-full" style="display: none;"> Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were detected by rapidly turning off these magnets, thereby eliminating the magnetic minimum and releasing any antiatoms contained in the trap. Once released, these antiatoms quickly hit the trap wall, whereupon the positrons and antiprotons in the antiatoms annihilated. The antiproton annihilations produce easily detected signals; we used these signals to prove that we trapped antihydrogen. However, our technique could be confounded by mirror-trapped antiprotons, which would produce seemingly-identical annihilation signals upon hitting the trap wall. In this paper, we discuss possible sources of mirror-trapped antiprotons and show that antihydrogen and antiprotons can be readily distinguished, often with the aid of applied electric fields, by analyzing the annihilation locations and times. We further discuss the general properties of antiproton and antihydrogen trajectories in this magnetic geometry, and reconstruct the antihydrogen energy distribution from the measured annihilation time history. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.3944v1-abstract-full').style.display = 'none'; document.getElementById('1201.3944v1-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 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </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">17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys., 14 015010, 2012 </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/1104.4982">arXiv:1104.4982</a> <span> [<a href="https://arxiv.org/pdf/1104.4982">pdf</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="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="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/10.1038/nphys2025">10.1038/nphys2025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Confinement of antihydrogen for 1000 seconds </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=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=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=Deller%2C+A">A. Deller</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</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=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=Gutierrez%2C+A">A. Gutierrez</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=Kemp%2C+S">S. Kemp</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</a> , et al. (14 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="1104.4982v1-abstract-short" style="display: inline;"> Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is this longevity that holds the promise of precision studies of matter-antimatter symmetry. We have recently demonstrated trapping of antihydrogen atoms by releasing them after a confinement time of 172 ms. A critical… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4982v1-abstract-full').style.display = 'inline'; document.getElementById('1104.4982v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.4982v1-abstract-full" style="display: none;"> Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is this longevity that holds the promise of precision studies of matter-antimatter symmetry. We have recently demonstrated trapping of antihydrogen atoms by releasing them after a confinement time of 172 ms. A critical question for future studies is: how long can anti-atoms be trapped? Here we report the observation of anti-atom confinement for 1000 s, extending our earlier results by nearly four orders of magnitude. Our calculations indicate that most of the trapped anti-atoms reach the ground state. Further, we report the first measurement of the energy distribution of trapped antihydrogen which, coupled with detailed comparisons with simulations, provides a key tool for the systematic investigation of trapping dynamics. These advances open up a range of experimental possibilities, including precision studies of CPT symmetry and cooling to temperatures where gravitational effects could become apparent. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4982v1-abstract-full').style.display = 'none'; document.getElementById('1104.4982v1-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> 26 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">30 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-11-02 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Phys.7:558-564,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.4841">arXiv:1104.4841</a> <span> [<a href="https://arxiv.org/pdf/1104.4841">pdf</a>, <a href="https://arxiv.org/format/1104.4841">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.106.145001">10.1103/PhysRevLett.106.145001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Centrifugal separation and equilibration dynamics in an electron-antiproton plasma </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=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=Bowe%2C+P+D">P. D. Bowe</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=Deller%2C+A">A. Deller</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</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=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=Gutierrez%2C+A">A. Gutierrez</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=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=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</a> , et al. (12 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="1104.4841v1-abstract-short" style="display: inline;"> Charges in cold, multiple-species, non-neutral plasmas separate radially by mass, forming centrifugally-separated states. Here, we report the first detailed measurements of such states in an electron-antiproton plasma, and the first observations of the separation dynamics in any centrifugally-separated system. While the observed equilibrium states are expected and in agreement with theory, the equ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4841v1-abstract-full').style.display = 'inline'; document.getElementById('1104.4841v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.4841v1-abstract-full" style="display: none;"> Charges in cold, multiple-species, non-neutral plasmas separate radially by mass, forming centrifugally-separated states. Here, we report the first detailed measurements of such states in an electron-antiproton plasma, and the first observations of the separation dynamics in any centrifugally-separated system. While the observed equilibrium states are expected and in agreement with theory, the equilibration time is approximately constant over a wide range of parameters, a surprising and as yet unexplained result. Electron-antiproton plasmas play a crucial role in antihydrogen trapping experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4841v1-abstract-full').style.display = 'none'; document.getElementById('1104.4841v1-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> 26 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">Journal ref:</span> Phys. Rev. Lett., 106 145001, (2011) </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/1009.4687">arXiv:1009.4687</a> <span> [<a href="https://arxiv.org/pdf/1009.4687">pdf</a>, <a href="https://arxiv.org/format/1009.4687">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-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/10.1103/PhysRevLett.105.013003">10.1103/PhysRevLett.105.013003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evaporative Cooling of Antiprotons to Cryogenic Temperatures </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=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=Bowe%2C+P+D">P. D. Bowe</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=Friesen%2C+T">T. Friesen</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">A. 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>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. 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="1009.4687v1-abstract-short" style="display: inline;"> We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9~K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling efficiency in future experiments. The technique opens up new possibi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1009.4687v1-abstract-full').style.display = 'inline'; document.getElementById('1009.4687v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1009.4687v1-abstract-full" style="display: none;"> We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9~K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling efficiency in future experiments. The technique opens up new possibilities for cooling of trapped ions and is of particular interest in antiproton physics, where a precise \emph{CPT} test on trapped antihydrogen is a long-standing goal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1009.4687v1-abstract-full').style.display = 'none'; document.getElementById('1009.4687v1-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 September, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">5 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.105:013003,2010 </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> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0704.3320">arXiv:0704.3320</a> <span> [<a href="https://arxiv.org/pdf/0704.3320">pdf</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="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/10.1007/s10751-007-9527-2">10.1007/s10751-007-9527-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Towards Antihydrogen Confinement with the ALPHA Antihydrogen Trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <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">G. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Boston%2C+A">A. Boston</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</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=Chartier%2C+M">M. Chartier</a>, <a href="/search/physics?searchtype=author&query=Deutsch%2C+A">A. Deutsch</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=Gomberoff%2C+K">K. Gomberoff</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=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=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. (10 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="0704.3320v1-abstract-short" style="display: inline;"> ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with the ultimate goal of precise spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA project and the prospects for antihydrogen trapping. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0704.3320v1-abstract-full" style="display: none;"> ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with the ultimate goal of precise spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA project and the prospects for antihydrogen trapping. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0704.3320v1-abstract-full').style.display = 'none'; document.getElementById('0704.3320v1-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> 25 April, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2007. </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 International Conference on Trapped Charged Particles and Fundamental Physics: TCP06, Parksville, BC, Canada, September 2006. To be published in Hyperfine Interactions</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-07-03 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0507082">arXiv:hep-ex/0507082</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0507082">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="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/10.1063/1.2121974">10.1063/1.2121974 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Detecting Antihydrogen: The Challenges and the Applications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</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="hep-ex/0507082v1-abstract-short" style="display: inline;"> ATHENA's first detection of cold antihydrogen atoms relied on their annihilation signatures in a sophisticated particle detector. We will review the features of the ATHENA detector and its applications in trap physics. The detector for a new experiment ALPHA will have considerable challenges due to increased material thickness in the trap apparatus as well as field non-uniformity. Our studies in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0507082v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0507082v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0507082v1-abstract-full" style="display: none;"> ATHENA's first detection of cold antihydrogen atoms relied on their annihilation signatures in a sophisticated particle detector. We will review the features of the ATHENA detector and its applications in trap physics. The detector for a new experiment ALPHA will have considerable challenges due to increased material thickness in the trap apparatus as well as field non-uniformity. Our studies indicate that annihilation vertex imaging should be still possible despite these challenges. An alternative method for trapped antihydrogen, via electron impact ionization, will be also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0507082v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0507082v1-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 July, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2005. </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 paper at International Workshop on Physics with Ultra-Slow Antiprotons, RIKEN, Japan, March 2005. To be published in AIP Conference Proceedings</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-05-23 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0401162">arXiv:physics/0401162</a> <span> [<a href="https://arxiv.org/pdf/physics/0401162">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Physics">physics.gen-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/10.1063/1.1635168">10.1063/1.1635168 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Three Dimensional Annihilation Imaging of Antiprotons in a Penning Trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Amoretti%2C+M">M. Amoretti</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Bouchta%2C+A">A. Bouchta</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Carraro%2C+C">C. Carraro</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Filippini%2C+V">V. Filippini</a>, <a href="/search/physics?searchtype=author&query=Fontana%2C+A">A. Fontana</a>, <a href="/search/physics?searchtype=author&query=Funakoshi%2C+R">R. Funakoshi</a>, <a href="/search/physics?searchtype=author&query=Genova%2C+P">P. Genova</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Jorgensen%2C+L+V">L. V. Jorgensen</a>, <a href="/search/physics?searchtype=author&query=Lagomarsino%2C+V">V. Lagomarsino</a>, <a href="/search/physics?searchtype=author&query=Landuad%2C+R">R. Landuad</a>, <a href="/search/physics?searchtype=author&query=Lindelof%2C+D">D. Lindelof</a>, <a href="/search/physics?searchtype=author&query=Rizzini%2C+E+L">E. Lodi Rizzini</a>, <a href="/search/physics?searchtype=author&query=Macri%2C+M">M. Macri</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Marchesotti%2C+M">M. Marchesotti</a>, <a href="/search/physics?searchtype=author&query=Montagna%2C+P">P. Montagna</a>, <a href="/search/physics?searchtype=author&query=Pruys%2C+H">H. Pruys</a> , et al. (6 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="physics/0401162v1-abstract-short" style="display: inline;"> We demonstrate three-dimensional annihilation imaging of antiprotons trapped in a Penning trap. Exploiting unusual feature of antiparticles, we investigate a previously unexplored regime in particle transport; the proximity of the trap wall. Particle loss on the wall, the final step of radial transport, is observed to be highly non-uniform, both radially and azimuthally. These observations have… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401162v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0401162v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0401162v1-abstract-full" style="display: none;"> We demonstrate three-dimensional annihilation imaging of antiprotons trapped in a Penning trap. Exploiting unusual feature of antiparticles, we investigate a previously unexplored regime in particle transport; the proximity of the trap wall. Particle loss on the wall, the final step of radial transport, is observed to be highly non-uniform, both radially and azimuthally. These observations have considerable implications for the production and detection of antihydrogen atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401162v1-abstract-full').style.display = 'none'; document.getElementById('physics/0401162v1-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 January, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2004. </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 NNP03, Workshop on Non-Neutral Plasmas, 2003</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Non-Neutral Plasma Physics V, (AIP, New York, 2003) pp. 131-139 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0307151">arXiv:physics/0307151</a> <span> [<a href="https://arxiv.org/pdf/physics/0307151">pdf</a>, <a href="https://arxiv.org/ps/physics/0307151">ps</a>, <a href="https://arxiv.org/format/physics/0307151">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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="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/PhysRevLett.91.055001">10.1103/PhysRevLett.91.055001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Positron plasma diagnostics and temperature control for antihydrogen production </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ATHENA+Collaboration"> ATHENA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Amoretti%2C+M">M. Amoretti</a>, <a href="/search/physics?searchtype=author&query=Amsler%2C+C">C. Amsler</a>, <a href="/search/physics?searchtype=author&query=Bonomi%2C+G">G. Bonomi</a>, <a href="/search/physics?searchtype=author&query=Bouchta%2C+A">A. Bouchta</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Carraro%2C+C">C. Carraro</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Doser%2C+M">M. Doser</a>, <a href="/search/physics?searchtype=author&query=Filippini%2C+V">V. Filippini</a>, <a href="/search/physics?searchtype=author&query=Fontana%2C+A">A. Fontana</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=Genova%2C+P">P. Genova</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Jorgensen%2C+L+V">L. V. Jorgensen</a>, <a href="/search/physics?searchtype=author&query=Lagomarsino%2C+V">V. Lagomarsino</a>, <a href="/search/physics?searchtype=author&query=Landua%2C+R">R. Landua</a>, <a href="/search/physics?searchtype=author&query=Lindelof%2C+D">D. Lindelof</a>, <a href="/search/physics?searchtype=author&query=Rizzini%2C+E+L">E. Lodi Rizzini</a>, <a href="/search/physics?searchtype=author&query=Macri%27%2C+M">M. Macri'</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Manuzio%2C+G">G. Manuzio</a> , et al. (7 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="physics/0307151v1-abstract-short" style="display: inline;"> Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the plasma density and temperature. We discuss non-destructive measurements, based on a novel, real-time analysis of excited, low-order plasma modes, that provide comprehensive characterization of the positron plasma in the ATHENA antihydrogen apparatus. The plas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0307151v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0307151v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0307151v1-abstract-full" style="display: none;"> Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the plasma density and temperature. We discuss non-destructive measurements, based on a novel, real-time analysis of excited, low-order plasma modes, that provide comprehensive characterization of the positron plasma in the ATHENA antihydrogen apparatus. The plasma length, radius, density, and total particle number are obtained. Measurement and control of plasma temperature variations, and the application to antihydrogen production experiments are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0307151v1-abstract-full').style.display = 'none'; document.getElementById('physics/0307151v1-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> 30 July, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2003. </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">5 pages, 4 figures, to be published in Phys. Rev. Lett</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.91:055001,2003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0202020">arXiv:nucl-ex/0202020</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0202020">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0202020">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0202020">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="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Producing Slow Antihydrogen for a Test of CPT Symmetry with ATHENA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ATHENA+Collaboration"> ATHENA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</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="nucl-ex/0202020v1-abstract-short" style="display: inline;"> The ATHENA experiment at the Antiproton Decelerator facility at CERN aims at testing CPT symmetry with antihydrogen. An overview of the experiment, together with preliminary results of development towards the production of slow antihydrogen are reported. </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0202020v1-abstract-full" style="display: none;"> The ATHENA experiment at the Antiproton Decelerator facility at CERN aims at testing CPT symmetry with antihydrogen. An overview of the experiment, together with preliminary results of development towards the production of slow antihydrogen are reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0202020v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0202020v1-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 February, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2002. </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, contribution to RIKEN International Symposium on Muon Catalyzed Fusion and Related Exotic Atoms, to be published in Hyperfine Interactions</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP/2001-084 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0111019">arXiv:nucl-ex/0111019</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0111019">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0111019">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0111019">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="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Resonant Scattering of Muonic Hydrogen Atoms and Dynamics of Muonic Molecular Complex </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Munoic+Hydrogen+Collaboration"> TRIUMF Munoic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Maier%2C+M">M. Maier</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Martoff%2C+C+J">C. J. Martoff</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Wozniak%2C+J">J. Wozniak</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="nucl-ex/0111019v1-abstract-short" style="display: inline;"> Resonant scattering of muonic hydrogen atoms via back decay of molecular complex, a key process in the understanding of epithermal muonic molecular formation, is analyzed. The limitations of the effective rate approximation are discussed and the importance of the explicit treatment of the back decay is stressed. An expression of the energy distribution for the back-decayed atoms is given. </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0111019v1-abstract-full" style="display: none;"> Resonant scattering of muonic hydrogen atoms via back decay of molecular complex, a key process in the understanding of epithermal muonic molecular formation, is analyzed. The limitations of the effective rate approximation are discussed and the importance of the explicit treatment of the back decay is stressed. An expression of the energy distribution for the back-decayed atoms is given. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0111019v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0111019v1-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 November, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2001. </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">5pages, contribution to RIKEN International Symposium on Muon Catalyzed Fusion, to be published in Hyperfine Interactions</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-01-36 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0104010">arXiv:physics/0104010</a> <span> [<a href="https://arxiv.org/pdf/physics/0104010">pdf</a>, <a href="https://arxiv.org/ps/physics/0104010">ps</a>, <a href="https://arxiv.org/format/physics/0104010">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Physics">physics.gen-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.86.3763">10.1103/PhysRevLett.86.3763 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Resonant $d渭t$ Molecular Formation Rate in Solid HD </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Douglas%2C+J+L">J. L. Douglas</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Maier%2C+M">M. Maier</a>, <a href="/search/physics?searchtype=author&query=kushin%2C+V+E+M">V. E. Mar kushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="physics/0104010v1-abstract-short" style="display: inline;"> Measurements of muon-catalyzed dt fusion ($d渭t \to ^4He+n+渭^-$) in solid HD have been performed. The theory describing the energy dependent resonant molecular formation rate for the reaction $渭t$ + HD $\to [(d渭t)pee]^*$ is compared to experimental results in a pure solid HD target. Constraints on the rates are inferred through the use of a Monte Carlo model developed specifically for the experim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0104010v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0104010v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0104010v1-abstract-full" style="display: none;"> Measurements of muon-catalyzed dt fusion ($d渭t \to ^4He+n+渭^-$) in solid HD have been performed. The theory describing the energy dependent resonant molecular formation rate for the reaction $渭t$ + HD $\to [(d渭t)pee]^*$ is compared to experimental results in a pure solid HD target. Constraints on the rates are inferred through the use of a Monte Carlo model developed specifically for the experiment. From the time-of- flight analysis of fusion events in 16 and 37 $渭g\cdot cm^{-2}$ targets, an average formation rate consistent with 0.897$\pm$(0.046)$_{stat}\pm$ (0.166)$_{syst}$ times the theoretical prediction was obtained. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0104010v1-abstract-full').style.display = 'none'; document.getElementById('physics/0104010v1-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 April, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2001. </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">4 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-01-01 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.86:3763-3766,2001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0101007">arXiv:nucl-ex/0101007</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0101007">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0101007">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0101007">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="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Time-of-Flight Spectroscopy of Muonic Hydrogen Atoms and Molecules </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Muonic+Hydrogen+Collaboration"> TRIUMF Muonic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="nucl-ex/0101007v1-abstract-short" style="display: inline;"> Studies of muonic hydrogen atoms and molecules have been performed traditionally in bulk targets of gas, liquid or solid. At TRIUMF, Canada's meson facility, we have developed a new type of target system using multilayer thin films of solid hydrogen, which provides a beam of muonic hydrogen atoms in vacuum. Using the time-of-flight of the muonic atoms, the energy-dependent information of muonic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0101007v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0101007v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0101007v1-abstract-full" style="display: none;"> Studies of muonic hydrogen atoms and molecules have been performed traditionally in bulk targets of gas, liquid or solid. At TRIUMF, Canada's meson facility, we have developed a new type of target system using multilayer thin films of solid hydrogen, which provides a beam of muonic hydrogen atoms in vacuum. Using the time-of-flight of the muonic atoms, the energy-dependent information of muonic reactions are obtained in direct manner. We discuss some unique measurements enabled by the new technique, with emphasis on processes relevant to muon catalyzed fusion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0101007v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0101007v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 January, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2001. </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">Contribution to Hydrogen Atom II --- Precise Physics with Simple Atomic Systems (Springer, Berlin)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-00-60 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0009005">arXiv:hep-ex/0009005</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0009005">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0009005">ps</a>, <a href="https://arxiv.org/format/hep-ex/0009005">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="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> <p class="title is-5 mathjax"> Using Thin Film Targets for Muonic Atoms and Muon Catalyzed Fusion Studies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Munoic+Hydrogen+Collaboration"> TRIUMF Munoic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Martoff%2C+C+J">C. J. Martoff</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="hep-ex/0009005v1-abstract-short" style="display: inline;"> Studies of muonic atoms and muon catalyzed fusion have been conventionally done in a bulk target of gas, liquid or solid hydrogen isotopes. The use of thin film targets developed at TRIUMF have notable advantages in tackling some of the most important questions in the field, which could be further exploited at future high intensity muon sources. We review the technique of the thin film method wi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0009005v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0009005v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0009005v1-abstract-full" style="display: none;"> Studies of muonic atoms and muon catalyzed fusion have been conventionally done in a bulk target of gas, liquid or solid hydrogen isotopes. The use of thin film targets developed at TRIUMF have notable advantages in tackling some of the most important questions in the field, which could be further exploited at future high intensity muon sources. We review the technique of the thin film method with emphasis on recent results and a future proposal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0009005v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0009005v1-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> 3 September, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2000. </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">Talk given at KEK International Workshop on High Intensity Muon Sources, HIMUS-99</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-00-51 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/nucl-ex/0008002">arXiv:nucl-ex/0008002</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0008002">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0008002">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0008002">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="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.85.1642">10.1103/PhysRevLett.85.1642 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Resonant Formation of $d渭t$ Molecules in Deuterium: An Atomic Beam Measurement of Muon Catalyzed dt Fusion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=TRIUMF+Munoic+Hydrogen+Collaboration"> TRIUMF Munoic Hydrogen Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+M">J. M. Bailey</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G+A">G. A. Beer</a>, <a href="/search/physics?searchtype=author&query=Beveridge%2C+J+L">J. L. Beveridge</a>, <a href="/search/physics?searchtype=author&query=Faifman%2C+M+P">M. P. Faifman</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+T+M">T. M. Huber</a>, <a href="/search/physics?searchtype=author&query=Kammel%2C+P">P. Kammel</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+S+K">S. K. Kim</a>, <a href="/search/physics?searchtype=author&query=Knowles%2C+P+E">P. E. Knowles</a>, <a href="/search/physics?searchtype=author&query=Kunselman%2C+A+R">A. R. Kunselman</a>, <a href="/search/physics?searchtype=author&query=Maier%2C+M">M. Maier</a>, <a href="/search/physics?searchtype=author&query=Markushin%2C+V+E">V. E. Markushin</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Martoff%2C+C+J">C. J. Martoff</a>, <a href="/search/physics?searchtype=author&query=Mason%2C+G+R">G. R. Mason</a>, <a href="/search/physics?searchtype=author&query=Mulhauser%2C+F">F. Mulhauser</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a>, <a href="/search/physics?searchtype=author&query=Petitjean%2C+C">C. Petitjean</a>, <a href="/search/physics?searchtype=author&query=Porcelli%2C+T+A">T. A. Porcelli</a>, <a href="/search/physics?searchtype=author&query=Wozniak%2C+J">J. Wozniak</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</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="nucl-ex/0008002v1-abstract-short" style="display: inline;"> Resonant formation of $d渭t$ molecules in collisions of muonic tritium ($渭t$) on D$_2$ was investigated using a beam of $渭t$ atoms, demonstrating a new direct approach in muon catalyzed fusion studies. Strong epithermal resonances in $d渭t$ formation were directly revealed for the first time. From the time-of-flight analysis of $2036\pm 116$ $dt$ fusion events, a formation rate consistent with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0008002v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0008002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0008002v1-abstract-full" style="display: none;"> Resonant formation of $d渭t$ molecules in collisions of muonic tritium ($渭t$) on D$_2$ was investigated using a beam of $渭t$ atoms, demonstrating a new direct approach in muon catalyzed fusion studies. Strong epithermal resonances in $d渭t$ formation were directly revealed for the first time. From the time-of-flight analysis of $2036\pm 116$ $dt$ fusion events, a formation rate consistent with $0.73\pm (0.16)_{meas} \pm (0.09)_{model}$ times the theoretical prediction was obtained. For the largest peak at a resonance energy of $0.423 \pm 0.037$ eV, this corresponds to a rate of $(7.1 \pm 1.8) \times 10^9$ s$^{-1}$, more than an order of magnitude larger than those at low energies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0008002v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0008002v1-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 August, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2000. </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">To appear in Phys. Rev. Lett</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-00-24 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett. 85 (2000) 1642-1645 </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 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