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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/1608.05436">arXiv:1608.05436</a> <span> [<a href="https://arxiv.org/pdf/1608.05436">pdf</a>, <a href="https://arxiv.org/ps/1608.05436">ps</a>, <a href="https://arxiv.org/format/1608.05436">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <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"> First application of superconducting transition-edge-sensor microcalorimeters to hadronic-atom x-ray spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Okada%2C+S">S. Okada</a>, <a href="/search/physics?searchtype=author&query=Bennett%2C+D+A">D. A. Bennett</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Doriese%2C+W+B">W. B. Doriese</a>, <a href="/search/physics?searchtype=author&query=Fowler%2C+J+W">J. W. Fowler</a>, <a href="/search/physics?searchtype=author&query=Gard%2C+J">J. Gard</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F+P">F. P. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hirenzaki%2C+S">S. Hirenzaki</a>, <a href="/search/physics?searchtype=author&query=Hays-Wehle%2C+J+P">J. P. Hays-Wehle</a>, <a href="/search/physics?searchtype=author&query=Hilton%2C+G+C">G. C. Hilton</a>, <a href="/search/physics?searchtype=author&query=Ikeno%2C+N">N. Ikeno</a>, <a href="/search/physics?searchtype=author&query=Iliescu%2C+M">M. Iliescu</a>, <a href="/search/physics?searchtype=author&query=Ishimoto%2C+S">S. Ishimoto</a>, <a href="/search/physics?searchtype=author&query=Itahashi%2C+K">K. Itahashi</a>, <a href="/search/physics?searchtype=author&query=Iwasaki%2C+M">M. Iwasaki</a>, <a href="/search/physics?searchtype=author&query=Koike%2C+T">T. Koike</a>, <a href="/search/physics?searchtype=author&query=Kuwabara%2C+K">K. Kuwabara</a>, <a href="/search/physics?searchtype=author&query=Ma%2C+Y">Y. Ma</a>, <a href="/search/physics?searchtype=author&query=Marton%2C+J">J. Marton</a>, <a href="/search/physics?searchtype=author&query=Noda%2C+H">H. Noda</a>, <a href="/search/physics?searchtype=author&query=O%27Neil%2C+G+C">G. C. O'Neil</a>, <a href="/search/physics?searchtype=author&query=Outa%2C+H">H. Outa</a>, <a href="/search/physics?searchtype=author&query=Reintsema%2C+C+D">C. D. Reintsema</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="1608.05436v1-abstract-short" style="display: inline;"> High-resolution pionic-atom x-ray spectroscopy was performed with an x-ray spectrometer based on a 240-pixel array of superconducting transition-edge-sensor (TES) microcalorimeters at the piM1 beam line of the Paul Scherrer Institute. X-rays emitted by pionic carbon via the 4f->3d transition and the parallel 4d->3p transition were observed with a full-width-at-half-maximum energy resolution of 6.8… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.05436v1-abstract-full').style.display = 'inline'; document.getElementById('1608.05436v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.05436v1-abstract-full" style="display: none;"> High-resolution pionic-atom x-ray spectroscopy was performed with an x-ray spectrometer based on a 240-pixel array of superconducting transition-edge-sensor (TES) microcalorimeters at the piM1 beam line of the Paul Scherrer Institute. X-rays emitted by pionic carbon via the 4f->3d transition and the parallel 4d->3p transition were observed with a full-width-at-half-maximum energy resolution of 6.8 eV at 6.4 keV. Measured x-ray energies are consistent with calculated electromagnetic values which considered the strong-interaction effect assessed via the Seki-Masutani potential for the 3p energy level, and favor the electronic population of two filled 1s electrons in the K-shell. Absolute energy calibration with an uncertainty of 0.1 eV was demonstrated under a high-rate hadron beam condition of 1.45 MHz. This is the first application of a TES spectrometer to hadronic-atom x-ray spectroscopy and is an important milestone towards next-generation high-resolution kaonic-atom x-ray spectroscopy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.05436v1-abstract-full').style.display = 'none'; document.getElementById('1608.05436v1-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 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">11 pages, 3 figures, submitted to PTEP</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.03293">arXiv:1601.03293</a> <span> [<a href="https://arxiv.org/pdf/1601.03293">pdf</a>, <a href="https://arxiv.org/ps/1601.03293">ps</a>, <a href="https://arxiv.org/format/1601.03293">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10909-016-1491-2">10.1007/s10909-016-1491-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Absolute Energy Calibration of X-ray TESs with 0.04 eV Uncertainty at 6.4 keV in a Hadron-Beam Environment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tatsuno%2C+H">H. Tatsuno</a>, <a href="/search/physics?searchtype=author&query=Doriese%2C+W+B">W. B. Doriese</a>, <a href="/search/physics?searchtype=author&query=Bennett%2C+D+A">D. A. Bennett</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=Fowler%2C+J+W">J. W. Fowler</a>, <a href="/search/physics?searchtype=author&query=Gard%2C+J">J. Gard</a>, <a href="/search/physics?searchtype=author&query=Gustafsson%2C+F+P">F. P. Gustafsson</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hays-Wehle%2C+J+P">J. P. Hays-Wehle</a>, <a href="/search/physics?searchtype=author&query=Hilton%2C+G+C">G. C. Hilton</a>, <a href="/search/physics?searchtype=author&query=Iliescu%2C+M">M. Iliescu</a>, <a href="/search/physics?searchtype=author&query=Ishimoto%2C+S">S. Ishimoto</a>, <a href="/search/physics?searchtype=author&query=Itahashi%2C+K">K. Itahashi</a>, <a href="/search/physics?searchtype=author&query=Iwasaki%2C+M">M. Iwasaki</a>, <a href="/search/physics?searchtype=author&query=Kuwabara%2C+K">K. Kuwabara</a>, <a href="/search/physics?searchtype=author&query=Ma%2C+Y">Y. Ma</a>, <a href="/search/physics?searchtype=author&query=Marton%2C+J">J. Marton</a>, <a href="/search/physics?searchtype=author&query=Noda%2C+H">H. Noda</a>, <a href="/search/physics?searchtype=author&query=O%27Neil%2C+G+C">G. C. O'Neil</a>, <a href="/search/physics?searchtype=author&query=Okada%2C+S">S. Okada</a>, <a href="/search/physics?searchtype=author&query=Outa%2C+H">H. Outa</a>, <a href="/search/physics?searchtype=author&query=Reintsema%2C+C+D">C. D. Reintsema</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+M">M. Sato</a>, <a href="/search/physics?searchtype=author&query=Schmidt%2C+D+R">D. R. Schmidt</a> , et al. (9 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.03293v1-abstract-short" style="display: inline;"> A performance evaluation of superconducting transition-edge sensors (TESs) in the environment of a pion beam line at a particle accelerator is presented. Averaged across the 209 functioning sensors in the array, the achieved energy resolution is 5.2 eV FWHM at Co $K_伪$ (6.9 keV) when the pion beam is off and 7.3 eV at a beam rate of 1.45 MHz. Absolute energy uncertainty of $\pm$0.04 eV is demonstr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.03293v1-abstract-full').style.display = 'inline'; document.getElementById('1601.03293v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.03293v1-abstract-full" style="display: none;"> A performance evaluation of superconducting transition-edge sensors (TESs) in the environment of a pion beam line at a particle accelerator is presented. Averaged across the 209 functioning sensors in the array, the achieved energy resolution is 5.2 eV FWHM at Co $K_伪$ (6.9 keV) when the pion beam is off and 7.3 eV at a beam rate of 1.45 MHz. Absolute energy uncertainty of $\pm$0.04 eV is demonstrated for Fe $K_伪$ (6.4 keV) with in-situ energy calibration obtained from other nearby known x-ray lines. To achieve this small uncertainty, it is essential to consider the non-Gaussian energy response of the TESs and thermal cross-talk pile-up effects due to charged-particle hits in the silicon substrate of the TES array. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.03293v1-abstract-full').style.display = 'none'; document.getElementById('1601.03293v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">Accepted for publication in J. Low Temperature Physics, special issue for the proceedings of the Low Temperature Detectors 16 conference</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1507.08422">arXiv:1507.08422</a> <span> [<a href="https://arxiv.org/pdf/1507.08422">pdf</a>, <a href="https://arxiv.org/format/1507.08422">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Whole-body counter surveys of over 2700 babies and small children in and around Fukushima Prefecture 33 to 49 months after the Fukushima Daiichi NPP accident </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Tsubokura%2C+M">Masaharu Tsubokura</a>, <a href="/search/physics?searchtype=author&query=Miyazaki%2C+M">Makoto Miyazaki</a>, <a href="/search/physics?searchtype=author&query=Ozaki%2C+A">Akihiko Ozaki</a>, <a href="/search/physics?searchtype=author&query=Shimada%2C+Y">Yuki Shimada</a>, <a href="/search/physics?searchtype=author&query=Kambe%2C+T">Toshiyuki Kambe</a>, <a href="/search/physics?searchtype=author&query=Nemoto%2C+T">Tsuyoshi Nemoto</a>, <a href="/search/physics?searchtype=author&query=Oikawa%2C+T">Tomoyoshi Oikawa</a>, <a href="/search/physics?searchtype=author&query=Kanazawa%2C+Y">Yukio Kanazawa</a>, <a href="/search/physics?searchtype=author&query=Nihei%2C+M">Masahiko Nihei</a>, <a href="/search/physics?searchtype=author&query=Sakura%2C+Y">Yu Sakura</a>, <a href="/search/physics?searchtype=author&query=Shimmura%2C+H">Hiroaki Shimmura</a>, <a href="/search/physics?searchtype=author&query=Akiyama%2C+J">Junichi Akiyama</a>, <a href="/search/physics?searchtype=author&query=Tokiwa%2C+M">Michio Tokiwa</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="1507.08422v3-abstract-short" style="display: inline;"> BABYSCAN, a whole body counter (WBC) for small children was developed in 2013, and units have been installed at three hospitals in Fukushima Prefecture. Between December, 2013 and March, 2015, 2707 children between the ages of 0 and 11 have been scanned, and none had detectable levels of radioactive cesium. The minimum detectable activities (MDAs) for $^{137}$Cs were $\leq 3.5$ Bq kg$^{-1}$ for ag… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.08422v3-abstract-full').style.display = 'inline'; document.getElementById('1507.08422v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.08422v3-abstract-full" style="display: none;"> BABYSCAN, a whole body counter (WBC) for small children was developed in 2013, and units have been installed at three hospitals in Fukushima Prefecture. Between December, 2013 and March, 2015, 2707 children between the ages of 0 and 11 have been scanned, and none had detectable levels of radioactive cesium. The minimum detectable activities (MDAs) for $^{137}$Cs were $\leq 3.5$ Bq kg$^{-1}$ for ages 0-1, decreasing to $\leq 2$ Bq kg$^{-1}$ for ages 10-11. Including the $^{134}$Cs contribution, these translate to a maximum committed effective dose of $\sim 16 渭$Sv y$^{-1}$ even for newborn babies, and therefore the internal exposure risks can be considered negligibly small. Analysis of the questionnaire filled out by the parents of the scanned children regarding their families' food and water consumption revealed that the majority of children residing in the town of Miharu regularly consume local or home-grown rice and vegetables, while in Minamisoma, a majority avoid tap water and produce from Fukushima. The data show, however, no correlation between consumption of locally produced food and water and the children's body burdens. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.08422v3-abstract-full').style.display = 'none'; document.getElementById('1507.08422v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 7 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.05548">arXiv:1501.05548</a> <span> [<a href="https://arxiv.org/pdf/1501.05548">pdf</a>, <a href="https://arxiv.org/format/1501.05548">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="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.5506/APhysPolB.46.101">10.5506/APhysPolB.46.101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+M">M. Sato</a>, <a href="/search/physics?searchtype=author&query=Ajimura%2C+S">S. Ajimura</a>, <a href="/search/physics?searchtype=author&query=Bazzi%2C+M">M. Bazzi</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G">G. Beer</a>, <a href="/search/physics?searchtype=author&query=Berucci%2C+C">C. Berucci</a>, <a href="/search/physics?searchtype=author&query=Bhang%2C+H">H. Bhang</a>, <a href="/search/physics?searchtype=author&query=Bosnar%2C+D">D. Bosnar</a>, <a href="/search/physics?searchtype=author&query=Bragadireanu%2C+M">M. Bragadireanu</a>, <a href="/search/physics?searchtype=author&query=Buehler%2C+P">P. Buehler</a>, <a href="/search/physics?searchtype=author&query=Busso%2C+L">L. Busso</a>, <a href="/search/physics?searchtype=author&query=Cargnelli%2C+M">M. Cargnelli</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+S">S. Choi</a>, <a href="/search/physics?searchtype=author&query=Clozza%2C+A">A. Clozza</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">C. Curceanu</a>, <a href="/search/physics?searchtype=author&query=D%27uffizi%2C+A">A. D'uffizi</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+S">S. Enomoto</a>, <a href="/search/physics?searchtype=author&query=Fabbietti%2C+L">L. Fabbietti</a>, <a href="/search/physics?searchtype=author&query=Faso%2C+D">D. Faso</a>, <a href="/search/physics?searchtype=author&query=Fiorini%2C+C">C. Fiorini</a>, <a href="/search/physics?searchtype=author&query=Fujioka%2C+H">H. Fujioka</a>, <a href="/search/physics?searchtype=author&query=Ghio%2C+F">F. Ghio</a>, <a href="/search/physics?searchtype=author&query=Golser%2C+R">R. Golser</a>, <a href="/search/physics?searchtype=author&query=Guaraldo%2C+C">C. Guaraldo</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a> , et al. (52 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="1501.05548v1-abstract-short" style="display: inline;"> The antikaon-nucleon interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. In this context the importance of kaonic deuterium X-ray spectroscopy has been well recognized, but no experimental results have yet been obtained due to the difficulty of the measurement. We propose to measure the shift and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05548v1-abstract-full').style.display = 'inline'; document.getElementById('1501.05548v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.05548v1-abstract-full" style="display: none;"> The antikaon-nucleon interaction close to threshold provides crucial information on the interplay between spontaneous and explicit chiral symmetry breaking in low-energy QCD. In this context the importance of kaonic deuterium X-ray spectroscopy has been well recognized, but no experimental results have yet been obtained due to the difficulty of the measurement. We propose to measure the shift and width of the kaonic deuterium 1s state with an accuracy of 60 eV and 140 eV respectively at J-PARC. These results together with the kaonic hydrogen data (KpX at KEK, DEAR and SIDDHARTA at DAFNE) will then permit the determination of values of both the isospin I=0 and I=1 antikaon-nucleon scattering lengths and will provide the most stringent constraints on the antikaon-nucleon interaction, promising a breakthrough. Refined Monte Carlo studies were performed, including the investigation of background suppression factors for the described setup. These studies have demonstrated the feasibility of determining the shift and width of the kaonic deuterium atom 1s state with the desired accuracy of 60 eV and 140 eV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05548v1-abstract-full').style.display = 'none'; document.getElementById('1501.05548v1-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, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </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, 9 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/1501.02637">arXiv:1501.02637</a> <span> [<a href="https://arxiv.org/pdf/1501.02637">pdf</a>, <a href="https://arxiv.org/format/1501.02637">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-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/10.2183/pjab.91.92">10.2183/pjab.91.92 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Whole body counter surveys of Miharu-town school children for four consecutive years after the Fukushima NPP accident </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Tsubokura%2C+M">Masaharu Tsubokura</a>, <a href="/search/physics?searchtype=author&query=Miyazaki%2C+M">Makoto Miyazaki</a>, <a href="/search/physics?searchtype=author&query=Satou%2C+H">Hideo Satou</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+K">Katsumi Sato</a>, <a href="/search/physics?searchtype=author&query=Masaki%2C+S">Shin Masaki</a>, <a href="/search/physics?searchtype=author&query=Sakuma%2C+Y">Yu Sakuma</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="1501.02637v2-abstract-short" style="display: inline;"> Comprehensive whole-body counter surveys of Miharu town school children have been conducted for four consecutive years, in 2011-2014. This represents the only long-term sampling-bias-free study of its type conducted after the Fukushima Dai-ichi accident. For the first time in 2014, a new device called the Babyscan, which has a low $^{134/137}$Cs MDA of $< 50$ Bq/body, was used to screen the childr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.02637v2-abstract-full').style.display = 'inline'; document.getElementById('1501.02637v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.02637v2-abstract-full" style="display: none;"> Comprehensive whole-body counter surveys of Miharu town school children have been conducted for four consecutive years, in 2011-2014. This represents the only long-term sampling-bias-free study of its type conducted after the Fukushima Dai-ichi accident. For the first time in 2014, a new device called the Babyscan, which has a low $^{134/137}$Cs MDA of $< 50$ Bq/body, was used to screen the children shorter than 130 cm. No child in this group was found to have detectable level of radiocesium. Using the MDAs, upper limits of daily intake of radiocesium were estimated for each child. For those screened with the Babyscan, the upper intake limits were found to be <1 Bq/day for $^{137}$Cs. Analysis of a questionnaire filled out by the children's parents regarding their food and water consumption shows that the majority of Miharu children regularly consume local and/or home-grown rice and vegetables. This however does not increase the body burden. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.02637v2-abstract-full').style.display = 'none'; document.getElementById('1501.02637v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </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">11 pages, 10 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/1408.4311">arXiv:1408.4311</a> <span> [<a href="https://arxiv.org/pdf/1408.4311">pdf</a>, <a href="https://arxiv.org/format/1408.4311">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-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/10.1088/0952-4746/34/4/787">10.1088/0952-4746/34/4/787 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Whole-body counter survey results 4 months after the Fukushima Daiichi NPP accident in Minamisoma City, Fukushima </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Watanabe%2C+Y">Yuni Watanabe</a>, <a href="/search/physics?searchtype=author&query=Nomura%2C+S">Shuhei Nomura</a>, <a href="/search/physics?searchtype=author&query=Nemoto%2C+T">Tsuyoshi Nemoto</a>, <a href="/search/physics?searchtype=author&query=Tsubokura%2C+M">Masaharu Tsubokura</a>, <a href="/search/physics?searchtype=author&query=Hanai%2C+T">Tatsuo Hanai</a>, <a href="/search/physics?searchtype=author&query=Kumemoto%2C+Y">Yuki Kumemoto</a>, <a href="/search/physics?searchtype=author&query=Kowata%2C+S">Satoshi Kowata</a>, <a href="/search/physics?searchtype=author&query=Oikawa%2C+T">Tomoyoshi Oikawa</a>, <a href="/search/physics?searchtype=author&query=Kanazawa%2C+Y">Yukio Kanazawa</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="1408.4311v1-abstract-short" style="display: inline;"> Using the first WBC unit installed in Fukushima Prefecture after the accident, the radiocesium body burdens of 566 high-risk residents of Minamisoma city were measured in July 2011 at the Minamisoma Municipal General Hospital. The analysis of the data was challenging because this chair-type WBC unit did not have sufficient shielding against background gamma rays, and methods had to be developed to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1408.4311v1-abstract-full').style.display = 'inline'; document.getElementById('1408.4311v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1408.4311v1-abstract-full" style="display: none;"> Using the first WBC unit installed in Fukushima Prefecture after the accident, the radiocesium body burdens of 566 high-risk residents of Minamisoma city were measured in July 2011 at the Minamisoma Municipal General Hospital. The analysis of the data was challenging because this chair-type WBC unit did not have sufficient shielding against background gamma rays, and methods had to be developed to reliably compensate for the body-attenuated background radiation. Fortunately, data for repeated tests of hospital staff members using both the chair-type and well-shielded FASTSCAN WBC units, installed in September 2011, were available, and could be used to check the validity of the analysis. The CEDs of all subjects, estimated under the assumption of acute inhalation in March 2011, were found to be less than 1 mSv. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1408.4311v1-abstract-full').style.display = 'none'; document.getElementById('1408.4311v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 August, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2014. </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">16 pages, 11 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/1402.5508">arXiv:1402.5508</a> <span> [<a href="https://arxiv.org/pdf/1402.5508">pdf</a>, <a href="https://arxiv.org/format/1402.5508">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-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/10.1088/0952-4746/34/3/645">10.1088/0952-4746/34/3/645 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> BABYSCAN - a whole body counter for small children in Fukushima </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Yamanaka%2C+S">Shunji Yamanaka</a>, <a href="/search/physics?searchtype=author&query=Bronson%2C+F+L">Frazier L. Bronson</a>, <a href="/search/physics?searchtype=author&query=Oginni%2C+B">Babatunde Oginni</a>, <a href="/search/physics?searchtype=author&query=Muramatsu%2C+I">Isamu Muramatsu</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="1402.5508v2-abstract-short" style="display: inline;"> BABYSCAN, a whole body counter for small children with a detection limit for $^{137}$Cs of better than 50 Bq/body, was developed, and the first unit has been installed at a hospital in Fukushima, to help families with small children who are very much concerned about internal exposures. The design principles, implementation details and the initial operating experience are described. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1402.5508v2-abstract-full" style="display: none;"> BABYSCAN, a whole body counter for small children with a detection limit for $^{137}$Cs of better than 50 Bq/body, was developed, and the first unit has been installed at a hospital in Fukushima, to help families with small children who are very much concerned about internal exposures. The design principles, implementation details and the initial operating experience are described. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1402.5508v2-abstract-full').style.display = 'none'; document.getElementById('1402.5508v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 February, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2014. </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 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1303.2831">arXiv:1303.2831</a> <span> [<a href="https://arxiv.org/pdf/1303.2831">pdf</a>, <a href="https://arxiv.org/format/1303.2831">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-4075/46/12/125003">10.1088/0953-4075/46/12/125003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Friedreich%2C+S">Susanne Friedreich</a>, <a href="/search/physics?searchtype=author&query=Barna%2C+D">Daniel Barna</a>, <a href="/search/physics?searchtype=author&query=Caspers%2C+F">Fritz Caspers</a>, <a href="/search/physics?searchtype=author&query=Dax%2C+A">Andreas Dax</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">Masaki Hori</a>, <a href="/search/physics?searchtype=author&query=Horv%C3%A1th%2C+D">Dezs艖 Horv谩th</a>, <a href="/search/physics?searchtype=author&query=Juh%C3%A1sz%2C+B">Bertalan Juh谩sz</a>, <a href="/search/physics?searchtype=author&query=Kobayashi%2C+T">Takumi Kobayashi</a>, <a href="/search/physics?searchtype=author&query=Massiczek%2C+O">Oswald Massiczek</a>, <a href="/search/physics?searchtype=author&query=S%C3%B3t%C3%A9r%2C+A">Anna S贸t茅r</a>, <a href="/search/physics?searchtype=author&query=Todoroki%2C+K">Koichi Todoroki</a>, <a href="/search/physics?searchtype=author&query=Widmann%2C+E">Eberhard Widmann</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">Johann 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="1303.2831v2-abstract-short" style="display: inline;"> In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic helium-3. Two out of four measurable super-super-hyperfine SSHF transition lines of the (n,L)=(36,34) state of antiprotonic helium-3 were observed. The measured frequencies of the individual transitions are 11.12548(08) GHz and 11.15793(13) GHz, with an increased precision of about 43% and 2… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2831v2-abstract-full').style.display = 'inline'; document.getElementById('1303.2831v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1303.2831v2-abstract-full" style="display: none;"> In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic helium-3. Two out of four measurable super-super-hyperfine SSHF transition lines of the (n,L)=(36,34) state of antiprotonic helium-3 were observed. The measured frequencies of the individual transitions are 11.12548(08) GHz and 11.15793(13) GHz, with an increased precision of about 43% and 25% respectively compared to our first measurements with antiprotonic helium-3 [S. Friedreich et al., Phys. Lett. B 700 (2011) 1--6]. They are less than 0.5 MHz higher with respect to the most recent theoretical values, still within their estimated errors. Although the experimental uncertainty for the difference of 0.03245(15) GHz between these frequencies is large as compared to that of theory, its measured value also agrees with theoretical calculations. The rates for collisions between antiprotonic helium and helium atoms have been assessed through comparison with simulations, resulting in an elastic collision rate of gamma_e = 3.41 +- 0.62 MHz and an inelastic collision rate of gamma_i = 0.51 +- 0.07 MHz. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2831v2-abstract-full').style.display = 'none'; document.getElementById('1303.2831v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 March, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">15 pages, 9 figures. arXiv admin note: substantial text overlap with arXiv:1102.5286</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1206.0077">arXiv:1206.0077</a> <span> [<a href="https://arxiv.org/pdf/1206.0077">pdf</a>, <a href="https://arxiv.org/ps/1206.0077">ps</a>, <a href="https://arxiv.org/format/1206.0077">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/ptep/pts039">10.1093/ptep/pts039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The K1.8BR spectrometer system at J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Agari%2C+K">Keizo Agari</a>, <a href="/search/physics?searchtype=author&query=Ajimura%2C+S">Shuhei Ajimura</a>, <a href="/search/physics?searchtype=author&query=Beer%2C+G">George Beer</a>, <a href="/search/physics?searchtype=author&query=Bhang%2C+H">Hyoungchan Bhang</a>, <a href="/search/physics?searchtype=author&query=Bragadireanu%2C+M">Mario Bragadireanu</a>, <a href="/search/physics?searchtype=author&query=Buehler%2C+P">Paul Buehler</a>, <a href="/search/physics?searchtype=author&query=Busso%2C+L">Luigi Busso</a>, <a href="/search/physics?searchtype=author&query=Cargnelli%2C+M">Michael Cargnelli</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+S">Seonho Choi</a>, <a href="/search/physics?searchtype=author&query=Curceanu%2C+C">Catalina Curceanu</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+S">Shun Enomoto</a>, <a href="/search/physics?searchtype=author&query=Faso%2C+D">Diego Faso</a>, <a href="/search/physics?searchtype=author&query=Fujioka%2C+H">Hiroyuki Fujioka</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+Y">Yuya Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Fukuda%2C+T">Tomokazu Fukuda</a>, <a href="/search/physics?searchtype=author&query=Guaraldo%2C+C">Carlo Guaraldo</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">Tadashi Hashimoto</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hiraiwa%2C+T">Toshihiko Hiraiwa</a>, <a href="/search/physics?searchtype=author&query=Hirose%2C+E">Erina Hirose</a>, <a href="/search/physics?searchtype=author&query=Ieiri%2C+M">Masaharu Ieiri</a>, <a href="/search/physics?searchtype=author&query=Iio%2C+M">Masami Iio</a>, <a href="/search/physics?searchtype=author&query=Iliescu%2C+M">Mihai Iliescu</a>, <a href="/search/physics?searchtype=author&query=Inoue%2C+K">Kentaro Inoue</a>, <a href="/search/physics?searchtype=author&query=Ishiguro%2C+Y">Yosuke Ishiguro</a> , et al. (60 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="1206.0077v2-abstract-short" style="display: inline;"> A new spectrometer system was designed and constructed at the secondary beam line K1.8BR in the hadron hall of J-PARC to investigate $\bar K N$ interactions and $\bar K$-nuclear bound systems. The spectrometer consists of a high precision beam line spectrometer, a liquid $^3$He/$^4$He/D$_2$ target system, a Cylindrical Detector System that surrounds the target to detect the decay particles from th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.0077v2-abstract-full').style.display = 'inline'; document.getElementById('1206.0077v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1206.0077v2-abstract-full" style="display: none;"> A new spectrometer system was designed and constructed at the secondary beam line K1.8BR in the hadron hall of J-PARC to investigate $\bar K N$ interactions and $\bar K$-nuclear bound systems. The spectrometer consists of a high precision beam line spectrometer, a liquid $^3$He/$^4$He/D$_2$ target system, a Cylindrical Detector System that surrounds the target to detect the decay particles from the target region, and a neutron time-of-flight counter array located $\sim$15 m downstream from the target position. Details of the design, construction, and performance of the detector components are described. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.0077v2-abstract-full').style.display = 'none'; document.getElementById('1206.0077v2-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 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 June, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">33 pages, 25 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Prog. Theor. Exp. Phys. (2012) 02B011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.2183">arXiv:1205.2183</a> <span> [<a href="https://arxiv.org/pdf/1205.2183">pdf</a>, <a href="https://arxiv.org/ps/1205.2183">ps</a>, <a href="https://arxiv.org/format/1205.2183">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2012.05.080">10.1016/j.nima.2012.05.080 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of liquid helium-3 target for experimental studies of antikaon-nucleon interaction at J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Iio%2C+M">M. Iio</a>, <a href="/search/physics?searchtype=author&query=Ishimoto%2C+S">S. Ishimoto</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+M">M. Sato</a>, <a href="/search/physics?searchtype=author&query=Enomoto%2C+S">S. Enomoto</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+S">S. Suzuki</a>, <a href="/search/physics?searchtype=author&query=Iwasaki%2C+M">M. Iwasaki</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</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="1205.2183v1-abstract-short" style="display: inline;"> A liquid helium-3 target system was developed for experimental studies of kaonic atoms and kaonic nuclei at J-PARC. helium-3 gas is liquefied in a heat exchanger cooled below 3.2 K by decompression of liquid helium-4. To maintain a large acceptance of the cylindrical detector system for decay particles of kaonic nuclei, efficient heat transport between the separate target cell and the main unit is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.2183v1-abstract-full').style.display = 'inline'; document.getElementById('1205.2183v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.2183v1-abstract-full" style="display: none;"> A liquid helium-3 target system was developed for experimental studies of kaonic atoms and kaonic nuclei at J-PARC. helium-3 gas is liquefied in a heat exchanger cooled below 3.2 K by decompression of liquid helium-4. To maintain a large acceptance of the cylindrical detector system for decay particles of kaonic nuclei, efficient heat transport between the separate target cell and the main unit is realized using circulation of liquid helium-3. To minimize the amount of material, a vacuum vessel containing a carbon fiber reinforced plastic cylinder having an inside diameter of 150 mm and a thickness of 1 mm was produced. A target cell made of pure beryllium and beryllium-aluminum alloy was developed not only to minimize the amount of material but to obtain also high x-ray transmission. During a cooling test, the target cell was kept at 1.3 K at a pressure of 33 mbar. The total estimated heat load to the components including the target cell and heat exchanger cooled by liquid helium-4 decompression, was 0.21 W, and the liquid helium-4 consumption rate was 50 L/day. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.2183v1-abstract-full').style.display = 'none'; document.getElementById('1205.2183v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">14 pages, 9 figures, submitted to Nuclear Instruments and Methods in Physics Research Section A</span> </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/1104.4661">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/1103.2254">arXiv:1103.2254</a> <span> [<a href="https://arxiv.org/pdf/1103.2254">pdf</a>, <a href="https://arxiv.org/ps/1103.2254">ps</a>, <a href="https://arxiv.org/format/1103.2254">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"> Temperature dependencies of the energy and time resolution of silicon drift detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wuenschek%2C+B+K">B. K. Wuenschek</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+Y">Y. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Iio%2C+M">M. Iio</a>, <a href="/search/physics?searchtype=author&query=Ishimoto%2C+S">S. Ishimoto</a>, <a href="/search/physics?searchtype=author&query=Ishiwatari%2C+T">T. Ishiwatari</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+M">M. Sato</a>, <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</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="1103.2254v1-abstract-short" style="display: inline;"> The response of silicon drift detectors (SDDs), which were mounted together with their preamplifiers inside a vacuum chamber, was studied in a temperature range from 100 K to 200 K. In particular, the energy resolution could be stabilized to about 150 eV at 6 keV between 130 K and 200 K, while the time resolution shows a temperature dependence of T^3 in this temperature range. To keep a variation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.2254v1-abstract-full').style.display = 'inline'; document.getElementById('1103.2254v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1103.2254v1-abstract-full" style="display: none;"> The response of silicon drift detectors (SDDs), which were mounted together with their preamplifiers inside a vacuum chamber, was studied in a temperature range from 100 K to 200 K. In particular, the energy resolution could be stabilized to about 150 eV at 6 keV between 130 K and 200 K, while the time resolution shows a temperature dependence of T^3 in this temperature range. To keep a variation of the X-ray peak positions within 1 eV, it is necessary to operate the preamplifier within a stability of 1 K around 280 K. A detailed investigation of this temperature influences on SDDs and preamplifiers is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.2254v1-abstract-full').style.display = 'none'; document.getElementById('1103.2254v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 March, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2011. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1102.5286">arXiv:1102.5286</a> <span> [<a href="https://arxiv.org/pdf/1102.5286">pdf</a>, <a href="https://arxiv.org/format/1102.5286">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/10.1016/j.physletb.2011.04.029">10.1016/j.physletb.2011.04.029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First observation of two hyperfine transitions in antiprotonic He-3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Friedreich%2C+S">S. Friedreich</a>, <a href="/search/physics?searchtype=author&query=Barna%2C+D">D. Barna</a>, <a href="/search/physics?searchtype=author&query=Caspers%2C+F">F. Caspers</a>, <a href="/search/physics?searchtype=author&query=Dax%2C+A">A. Dax</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">M. Hori</a>, <a href="/search/physics?searchtype=author&query=Horv%C3%A1th%2C+D">D. Horv谩th</a>, <a href="/search/physics?searchtype=author&query=Juh%C3%A1sz%2C+B">B. Juh谩sz</a>, <a href="/search/physics?searchtype=author&query=Kobayashi%2C+T">T. Kobayashi</a>, <a href="/search/physics?searchtype=author&query=Massiczek%2C+O">O. Massiczek</a>, <a href="/search/physics?searchtype=author&query=S%C3%B3t%C3%A9r%2C+A">A. S贸t茅r</a>, <a href="/search/physics?searchtype=author&query=Todoroki%2C+K">K. Todoroki</a>, <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</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="1102.5286v2-abstract-short" style="display: inline;"> We report on the first experimental results for microwave spectroscopy of the hyperfine structure of antiprotonic He-3. Due to the helium nuclear spin, antiprotonic He-3 has a more complex hyperfine structure than antiprotonic He-4 which has already been studied before. Thus a comparison between theoretical calculations and the experimental results will provide a more stringent test of the three-b… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.5286v2-abstract-full').style.display = 'inline'; document.getElementById('1102.5286v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1102.5286v2-abstract-full" style="display: none;"> We report on the first experimental results for microwave spectroscopy of the hyperfine structure of antiprotonic He-3. Due to the helium nuclear spin, antiprotonic He-3 has a more complex hyperfine structure than antiprotonic He-4 which has already been studied before. Thus a comparison between theoretical calculations and the experimental results will provide a more stringent test of the three-body quantum electrodynamics (QED) theory. Two out of four super-super-hyperfine (SSHF) transition lines of the (n,L)=(36,34) state were observed. The measured frequencies of the individual transitions are 11.12559(14) GHz and 11.15839(18) GHz, less than 1 MHz higher than the current theoretical values, but still within their estimated errors. Although the experimental uncertainty for the difference of these frequencies is still very large as compared to that of theory, its measured value agrees with theoretical calculations. This difference is crucial to be determined because it is proportional to the magnetic moment of the antiproton. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.5286v2-abstract-full').style.display = 'none'; document.getElementById('1102.5286v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 February, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">8 pages, 6 figures, just published (online so far) in Physics Letters B</span> </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/0907.1184">arXiv:0907.1184</a> <span> [<a href="https://arxiv.org/pdf/0907.1184">pdf</a>, <a href="https://arxiv.org/ps/0907.1184">ps</a>, <a href="https://arxiv.org/format/0907.1184">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> <p class="title is-5 mathjax"> Collision Induced Relaxations within the Antiprotonic Helium Hyperfine Structure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pask%2C+T">T. Pask</a>, <a href="/search/physics?searchtype=author&query=Barna%2C+D">D. Barna</a>, <a href="/search/physics?searchtype=author&query=Dax%2C+A">A. Dax</a>, <a href="/search/physics?searchtype=author&query=Friedreich%2C+S">S. Friedreich</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">M. Hori</a>, <a href="/search/physics?searchtype=author&query=Horvath%2C+D">D. Horvath</a>, <a href="/search/physics?searchtype=author&query=Juhasz%2C+B">B. Juhasz</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Massiczek%2C+O">O. Massiczek</a>, <a href="/search/physics?searchtype=author&query=Ono%2C+N">N. Ono</a>, <a href="/search/physics?searchtype=author&query=Soter%2C+A">A. Soter</a>, <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</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="0907.1184v1-abstract-short" style="display: inline;"> We report the first measurements of the inelastic spin exchange collision rate between the Hyperfine (HF) levels of antiprotonic helium. We measure the time dependent evolution of the (37, 35) substates to obtain an inelastic collision rate which qualitatively agrees with recent theoretical calculations. We evaluate these results by using the obtained rate as a parameter in a rigorous simulation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.1184v1-abstract-full').style.display = 'inline'; document.getElementById('0907.1184v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0907.1184v1-abstract-full" style="display: none;"> We report the first measurements of the inelastic spin exchange collision rate between the Hyperfine (HF) levels of antiprotonic helium. We measure the time dependent evolution of the (37, 35) substates to obtain an inelastic collision rate which qualitatively agrees with recent theoretical calculations. We evaluate these results by using the obtained rate as a parameter in a rigorous simulation which we then compare to to previously measured data. We find that our measurement slightly underestimates the collision rate and therefore conclude that the actual value most probably falls within the upper, rather than lower, limit of the error. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0907.1184v1-abstract-full').style.display = 'none'; document.getElementById('0907.1184v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 July, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2009. </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, 10 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/0905.0545">arXiv:0905.0545</a> <span> [<a href="https://arxiv.org/pdf/0905.0545">pdf</a>, <a href="https://arxiv.org/ps/0905.0545">ps</a>, <a href="https://arxiv.org/format/0905.0545">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/10.1016/j.physletb.2009.05.038">10.1016/j.physletb.2009.05.038 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antiproton magnetic moment determined from the HFS of antiprotonic helium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pask%2C+T">T. Pask</a>, <a href="/search/physics?searchtype=author&query=Barna%2C+D">D. Barna</a>, <a href="/search/physics?searchtype=author&query=Dax%2C+A">A. Dax</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">M. Hori</a>, <a href="/search/physics?searchtype=author&query=Horv%C3%A1th%2C+D">D. Horv谩th</a>, <a href="/search/physics?searchtype=author&query=Friedreich%2C+S">S. Friedreich</a>, <a href="/search/physics?searchtype=author&query=Juh%C3%A1sz%2C+B">B. Juh谩sz</a>, <a href="/search/physics?searchtype=author&query=Massiczek%2C+O">O. Massiczek</a>, <a href="/search/physics?searchtype=author&query=Ono%2C+N">N. Ono</a>, <a href="/search/physics?searchtype=author&query=S%C3%B3t%C3%A9r%2C+A">A. S贸t茅r</a>, <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</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="0905.0545v1-abstract-short" style="display: inline;"> We report a determination of the antiproton magnetic moment, measured in a three-body system, independent of previous experiments. We present results from a systematic study of the hyperfine (HF) structure of antiprotonic helium where we have achieved a precision more than a factor of 10 better than our first measurement. A comparison between the experimental results and three-body quantum elect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0905.0545v1-abstract-full').style.display = 'inline'; document.getElementById('0905.0545v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0905.0545v1-abstract-full" style="display: none;"> We report a determination of the antiproton magnetic moment, measured in a three-body system, independent of previous experiments. We present results from a systematic study of the hyperfine (HF) structure of antiprotonic helium where we have achieved a precision more than a factor of 10 better than our first measurement. A comparison between the experimental results and three-body quantum electrodynamic (QED) calculations leads to a new value for the antiproton magnetic moment is -2.7862 (83) nuclear magnetons, which agrees with the magnetic moment of the proton within 2.9 x 10e-3. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0905.0545v1-abstract-full').style.display = 'none'; document.getElementById('0905.0545v1-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> 5 May, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2009. </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/0803.0876">arXiv:0803.0876</a> <span> [<a href="https://arxiv.org/pdf/0803.0876">pdf</a>, <a href="https://arxiv.org/ps/0803.0876">ps</a>, <a href="https://arxiv.org/format/0803.0876">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="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/10.1088/0953-4075/41/8/081008">10.1088/0953-4075/41/8/081008 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Improved Study of the Antiprotonic Helium Hyperfine Structure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pask%2C+T">T. Pask</a>, <a href="/search/physics?searchtype=author&query=Barna%2C+D">D. Barna</a>, <a href="/search/physics?searchtype=author&query=Dax%2C+A">A. Dax</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">M. Hori</a>, <a href="/search/physics?searchtype=author&query=Horv%C3%A1th%2C+D">D. Horv谩th</a>, <a href="/search/physics?searchtype=author&query=Juh%C3%A1sz%2C+B">B. Juh谩sz</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Marton%2C+J">J. Marton</a>, <a href="/search/physics?searchtype=author&query=Ono%2C+N">N. Ono</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+K">K. Suzuki</a>, <a href="/search/physics?searchtype=author&query=Zmeskal%2C+J">J. Zmeskal</a>, <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</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="0803.0876v2-abstract-short" style="display: inline;"> We report the initial results from a systematic study of the hyperfine (HF) structure of antiprotonic helium (n,l) = (37,~35) carried out at the Antiproton Decelerator (AD) at CERN. We performed a laser-microwave-laser resonance spectroscopy using a continuous wave (cw) pulse-amplified laser system and microwave cavity to measure the HF transition frequencies. Improvements in the spectral linewi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0803.0876v2-abstract-full').style.display = 'inline'; document.getElementById('0803.0876v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0803.0876v2-abstract-full" style="display: none;"> We report the initial results from a systematic study of the hyperfine (HF) structure of antiprotonic helium (n,l) = (37,~35) carried out at the Antiproton Decelerator (AD) at CERN. We performed a laser-microwave-laser resonance spectroscopy using a continuous wave (cw) pulse-amplified laser system and microwave cavity to measure the HF transition frequencies. Improvements in the spectral linewidth and stability of our laser system have increased the precision of these measurements by a factor of five and reduced the line width by a factor of three compared to our previous results. A comparison of the experimentally measured transition frequencies with three body QED calculations can be used to determine the antiproton spin magnetic moment, leading towards a test of CPT invariance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0803.0876v2-abstract-full').style.display = 'none'; document.getElementById('0803.0876v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 March, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 March, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">14 pages 9 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/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/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/0401095">arXiv:physics/0401095</a> <span> [<a href="https://arxiv.org/pdf/physics/0401095">pdf</a>, <a href="https://arxiv.org/ps/physics/0401095">ps</a>, <a href="https://arxiv.org/format/physics/0401095">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.70.012501">10.1103/PhysRevA.70.012501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Systematic study of the decay rates of antiprotonic helium states </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yamaguchi%2C+H">H. Yamaguchi</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/physics?searchtype=author&query=Sakaguchi%2C+J">J. Sakaguchi</a>, <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</a>, <a href="/search/physics?searchtype=author&query=Eades%2C+J">J. Eades</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">M. Hori</a>, <a href="/search/physics?searchtype=author&query=Torii%2C+H+A">H. A. Torii</a>, <a href="/search/physics?searchtype=author&query=Juhasz%2C+B">B. Juhasz</a>, <a href="/search/physics?searchtype=author&query=Horvath%2C+D">D. Horvath</a>, <a href="/search/physics?searchtype=author&query=Yamazaki%2C+T">T. Yamazaki</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/0401095v1-abstract-short" style="display: inline;"> A systematic study of the decay rates of antiprotonic helium (\pbhef and \pbhet) at CERN AD (Antiproton Decelerator) has been made by a laser spectroscopic method. The decay rates of some of its short-lived states, namely those for which the Auger rates $纬_{\mathrm{A}}$ are much larger than their radiative decay rates ($纬_{\mathrm{rad}} \sim 1$ $渭$s$^{-1}$), were determined from the time distrib… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401095v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0401095v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0401095v1-abstract-full" style="display: none;"> A systematic study of the decay rates of antiprotonic helium (\pbhef and \pbhet) at CERN AD (Antiproton Decelerator) has been made by a laser spectroscopic method. The decay rates of some of its short-lived states, namely those for which the Auger rates $纬_{\mathrm{A}}$ are much larger than their radiative decay rates ($纬_{\mathrm{rad}} \sim 1$ $渭$s$^{-1}$), were determined from the time distributions of the antiproton annihilation signals induced by laser beams, and the widths of the atomic resonance lines. The magnitude of the decay rates, especially their relation with the transition multipolarity, is discussed and compared with theoretical calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401095v1-abstract-full').style.display = 'none'; document.getElementById('physics/0401095v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 January, 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">6 pages, 5 figures, and 1 table</span> </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/physics/0207059">arXiv:physics/0207059</a> <span> [<a href="https://arxiv.org/pdf/physics/0207059">pdf</a>, <a href="https://arxiv.org/ps/physics/0207059">ps</a>, <a href="https://arxiv.org/format/physics/0207059">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.89.243402">10.1103/PhysRevLett.89.243402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hyperfine structure of antiprotonic helium revealed by a laser-microwave-laser resonance method </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/physics?searchtype=author&query=Sakaguchi%2C+J">J. Sakaguchi</a>, <a href="/search/physics?searchtype=author&query=Tasaki%2C+T">T. Tasaki</a>, <a href="/search/physics?searchtype=author&query=Yamaguchi%2C+H">H. Yamaguchi</a>, <a href="/search/physics?searchtype=author&query=Eades%2C+J">J. Eades</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">M. Hori</a>, <a href="/search/physics?searchtype=author&query=Torii%2C+H+A">H. A. Torii</a>, <a href="/search/physics?searchtype=author&query=Juh%C3%A1sz%2C+B">B. Juh谩sz</a>, <a href="/search/physics?searchtype=author&query=Horv%C3%A1th%2C+D">D. Horv谩th</a>, <a href="/search/physics?searchtype=author&query=Yamazaki%2C+T">T. Yamazaki</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/0207059v1-abstract-short" style="display: inline;"> Using a newly developed laser-microwave-laser resonance method, we observed a pair of microwave transitions between hyperfine levels of the $(n,L)=(37,35)$ state of antiprotonic helium. This experiment confirms the quadruplet hyperfine structure due to the interaction of the antiproton orbital angular momentum, the electron spin and the antiproton spin as predicted by Bakalov and Korobov. The me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0207059v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0207059v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0207059v1-abstract-full" style="display: none;"> Using a newly developed laser-microwave-laser resonance method, we observed a pair of microwave transitions between hyperfine levels of the $(n,L)=(37,35)$ state of antiprotonic helium. This experiment confirms the quadruplet hyperfine structure due to the interaction of the antiproton orbital angular momentum, the electron spin and the antiproton spin as predicted by Bakalov and Korobov. The measured frequencies of $谓_{\text HF}^+ =12.89596 \pm 0.00034$ GHz and $谓_{\text HF}^- =12.92467 \pm 0.00029$ GHz agree with recent theoretical calculations on a level of $ 6 \times10^{-5}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0207059v1-abstract-full').style.display = 'none'; document.getElementById('physics/0207059v1-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> 14 July, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">4 pages, 4 figures, 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 89 (2002) 243402 </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/0102002">arXiv:nucl-ex/0102002</a> <span> [<a href="https://arxiv.org/pdf/nucl-ex/0102002">pdf</a>, <a href="https://arxiv.org/ps/nucl-ex/0102002">ps</a>, <a href="https://arxiv.org/format/nucl-ex/0102002">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"> Hyperfine Structure Measurements of Antiprotonic Helium and Antihydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Widmann%2C+E">E. Widmann</a>, <a href="/search/physics?searchtype=author&query=Eades%2C+J">J. Eades</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hori%2C+M">M. Hori</a>, <a href="/search/physics?searchtype=author&query=Horvath%2C+D">D. Horvath</a>, <a href="/search/physics?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/physics?searchtype=author&query=Juhasz%2C+B">B. Juhasz</a>, <a href="/search/physics?searchtype=author&query=Sakaguchi%2C+J">J. Sakaguchi</a>, <a href="/search/physics?searchtype=author&query=Torii%2C+H+A">H. A. Torii</a>, <a href="/search/physics?searchtype=author&query=Yamaguchi%2C+H">H. Yamaguchi</a>, <a href="/search/physics?searchtype=author&query=Yamazaki%2C+T">T. Yamazaki</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/0102002v1-abstract-short" style="display: inline;"> This paper describes measurements of the hyperfine structure of two antiprotonic atoms that are planned at the Antiproton Decelerator (AD) at CERN. The first part deals with antiprotonic helium, a three-body system of alpha-particle, antiproton and electron that was previously studied at LEAR. A measurement will test existing three-body calculations and may - through comparison with these theori… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0102002v1-abstract-full').style.display = 'inline'; document.getElementById('nucl-ex/0102002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="nucl-ex/0102002v1-abstract-full" style="display: none;"> This paper describes measurements of the hyperfine structure of two antiprotonic atoms that are planned at the Antiproton Decelerator (AD) at CERN. The first part deals with antiprotonic helium, a three-body system of alpha-particle, antiproton and electron that was previously studied at LEAR. A measurement will test existing three-body calculations and may - through comparison with these theories - determine the magnetic moment of the antiproton more precisely than currently available, thus providing a test of CPT invariance. The second system, antihydrogen, consisting of an antiproton and a positron, is planned to be produced at thermal energies at the AD. A measurement of the ground-state hyperfine splitting, which for hydrogen is one of the most accurately measured physical quantities, will directly yield a precise value for the magnetic moment of the antiproton, and also compare the internal structure of proton and antiproton through the contribution of the magnetic size of the antiproton to the ground state hyperfine splitting. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('nucl-ex/0102002v1-abstract-full').style.display = 'none'; document.getElementById('nucl-ex/0102002v1-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 February, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">Proceedings of the Hydrogen II workshop, Castiglione della Pescaia, June 1 --3, 2000, 15 pages, 8 figures</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 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