@article {76, title = {Direct detection of antihydrogen atoms using a BGO crystal}, journal = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, volume = {840}, year = {2016}, pages = {153 - 159}, abstract = {

Abstract The \{ASACUSA\} collaboration has developed a detector consisting of a large size \{BGO\} crystal to detect an atomic antihydrogen beam, and performed the direct detection of antihydrogen atoms. Energy spectra from antihydrogen annihilation on the \{BGO\} crystal are discussed in comparison to simulation results from the \{GEANT4\} toolkit. Background mainly originating from cosmic rays were strongly suppressed by analyzing the energy deposited in the \{BGO\} and requiring a multiplicity of charged pions. Thus antihydrogen events were identified.

}, keywords = {Antihydrogen, antimatter, Cosmic ray background suppression, Detector, Inorganic scintillator}, issn = {0168-9002}, doi = {http://dx.doi.org/10.1016/j.nima.2016.10.019}, url = {http://www.sciencedirect.com/science/article/pii/S0168900216310440}, author = {Y. Nagata and N. Kuroda and M. Ohtsuka and M. Leali and E. Lodi-Rizzini and V. Mascagna and M. Tajima and H.A. Torii and N. Zurlo and Y. Matsuda and L. Venturelli and Y. Yamazaki} } @article {75, title = {The ASACUSA CUSP: an antihydrogen experiment}, journal = {Hyperfine Interactions}, volume = {235}, year = {2015}, pages = {13{\textendash}20}, abstract = {In order to test CPT symmetry between antihydrogen and its counterpart hydrogen, the ASACUSA collaboration plans to perform high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen atom in-flight. We have developed an apparatus ({\textquoteleft}{\textquoteleft}cusp trap{\textquoteright}{\textquoteright}) which consists of a superconducting anti-Helmholtz coil and multiple ring electrodes. For the preparation of slow antiprotons and positrons, Penning-Malmberg type traps were utilized. The spectrometer line was positioned downstream of the cusp trap. At the end of the beamline, an antihydrogen beam detector was located, which comprises an inorganic Bismuth Germanium Oxide (BGO) single-crystal scintillator housed in a vacuum duct and surrounding plastic scintillators. A significant fraction of antihydrogen atoms flowing out the cusp trap were detected.}, issn = {1572-9540}, doi = {10.1007/s10751-015-1205-1}, url = {http://dx.doi.org/10.1007/s10751-015-1205-1}, author = {Kuroda, N. and Ulmer, S. and Murtagh, D. J. and Gorp, S. and Nagata, Y. and Diermaier, M. and Federmann, S. and Leali, M. and Malbrunot, C. and Mascagna, V. and Massiczek, O. and Michishio, K. and Mizutani, T. and Mohri, A. and Nagahama, H. and Ohtsuka, M. and Radics, B. and Sakurai, S. and Sauerzopf, C. and Suzuki, K. and Tajima, M. and Torii, H. A. and Venturelli, L. and W{\"u}nschek, B. and Zmeskal, J. and Zurlo, N. and Higaki, H. and Kanai, Y. and Rizzini, E. Lodi and Nagashima, Y. and Matsuda, Y. and Widmann, E. and Yamazaki, Y.} } @article {56, title = {A source of antihydrogen for in-flight hyperfine spectroscopy}, journal = {Nat Commun}, volume = {5}, year = {2014}, month = {21/01/2014}, abstract = {

Antihydrogen, a positron bound to an antiproton, is the simplest antiatom. Its counterpart{\textemdash}hydrogen{\textemdash}is one of the most precisely investigated and best understood systems in physics research. High-resolution comparisons of both systems provide sensitive tests of CPT symmetry, which is the most fundamental symmetry in the Standard Model of elementary particle physics. Any measured difference would point to CPT violation and thus to new physics. Here we report the development of an antihydrogen source using a cusp trap for in-flight spectroscopy. A total of 80 antihydrogen atoms are unambiguously detected 2.7 m downstream of the production region, where perturbing residual magnetic fields are small. This is a major step towards precision spectroscopy of the ground-state hyperfine splitting of antihydrogen using Rabi-like beam spectroscopy.

}, url = {http://dx.doi.org/10.1038/ncomms4089}, author = {Kuroda, N. and Ulmer, S. and Murtagh, D. J. and Van Gorp, S. and Nagata, Y. and Diermaier, M. and Federmann, S. and Leali, M. and Malbrunot, C. and Mascagna, V. and Massiczek, O. and Michishio, K. and Mizutani, T. and Mohri, A. and Nagahama, H. and Ohtsuka, M. and Radics, B. and Sakurai, S. and Sauerzopf, C. and Suzuki, K. and Tajima, M. and Torii, H. A. and Venturelli, L. and Wu{\textasciidieresis}nschek, B. and Zmeskal, J. and Zurlo, N. and Higaki, H. and Kanai, Y. and Lodi Rizzini, E. and Nagashima, Y. and Matsuda, Y. and Widmann, E. and Yamazaki, Y.} } @article {66, title = {Towards a spin polarized antihydrogen beam}, journal = {Hyperfine Interactions}, year = {2014}, pages = {1-10}, keywords = {Antihydrogen, Atomic beam, CPT invariance, Rydberg atom}, issn = {0304-3843}, doi = {10.1007/s10751-014-1016-9}, url = {http://dx.doi.org/10.1007/s10751-014-1016-9}, author = {Kuroda, N. and Ulmer, S. and Murtagh, D.J. and Van Gorp, S. and Nagata, Y. and Diermaier, M. and Federmann, S. and Leali, M. and Malbrunot, C. and Mascagna, V. and Massiczek, O. and Michishio, K. and Mizutani, T. and Mohri, A. and Nagahama, H. and Ohtsuka, M. and Radics, B. and Sakurai, S. and Sauerzopf, C. and Suzuki, K. and Tajima, M. and Torii, H.A. and Venturelli, L. and W{\"u}nschek, B. and Zmeskal, J. and Zurlo, N. and Higaki, H. and Kanai, Y. and Lodi-Rizzini, E. and Nagashima, Y. and Matsuda, Y. and Widmann, E. and Yamazaki, Y.} } @article {35, title = {Towards the production of anti-hydrogen beams}, journal = {AIP Conference Proceedings}, volume = {1521}, year = {2013}, pages = {134-143}, keywords = {antimatter, atomic beams, hydrogen neutral atoms, hyperfine structure, particle beam diagnostics}, doi = {10.1063/1.4796069}, url = {http://link.aip.org/link/?APC/1521/134/1}, author = {H. Higaki and Y. Enomoto and N. Kuroda and K. Michishio and D. J. Murtagh and S. Ulmer and S. Van Gorp and C. H. Kim and Y. Nagata and Y. Kanai and Torii, H.A. and M. Corradini and M. Leali and E. Lodi-Rizzini and V. Mascagna and L. Venturelli and N. Zurlo and K. Fujii and M. Otsuka and K. Tanaka and H. Imao and Y. Nagashima and Y. Matsuda and B. Juh{\'a}sz and A. Mohri and Y. Yamazaki}, editor = {Xabier Sarasola and Lutz Schweikhard and Thomas Sunn Pedersen} } @article {50, title = {Antihydrogen atom formation in a CUSP trap towards spin polarized beams}, journal = {Hyperfine Interactions}, volume = {212}, year = {2012}, pages = {31-40}, keywords = {Antihydrogen, Atomic beam, CPT invariance, Rydberg atom}, issn = {0304-3843}, doi = {10.1007/s10751-012-0646-z}, url = {http://dx.doi.org/10.1007/s10751-012-0646-z}, author = {Kuroda, N. and Enomoto, Y. and Michishio, K. and Kim, C.H. and Higaki, H. and Nagata, Y. and Kanai, Y. and Torii, H.A. and Corradini, M. and Leali, M. and Lodi-Rizzini, E. and Venturelli, L. and Zurlo, N. and Fujii, K. and Ohtsuka, M. and Tanaka, K. and Imao, H. and Nagashima, Y. and Matsuda, Y. and Juhasz, B. and Widmann, E. and Mohri, A. and Yamazaki, Y.} } @article {23, title = {Development of a monoenergetic ultraslow antiproton beam source for high-precision investigation}, journal = {Physical Review Special Topics - Accelerators and BeamsPhys. Rev. ST Accel. Beams}, volume = {15}, year = {2012}, month = {2012/02/17/}, pages = {024702 -}, url = {http://link.aps.org/doi/10.1103/PhysRevSTAB.15.024702}, author = {Kuroda, N. and Torii, H. A. and Nagata, Y. and Shibata, M. and Enomoto, Y. and Imao, H. and Kanai, Y. and Hori, M. and Saitoh, H. and Higaki, H. and Mohri, A. and Fujii, K. and Kim, C. H. and Matsuda, Y. and Michishio, K. and Nagashima, Y. and Ohtsuka, M. and Tanaka, K. and Yamazaki, Y.} } @article {49, title = {Synthesis of antihydrogen atoms in a CUSP trap}, journal = {Hyperfine Interactions}, volume = {209}, year = {2012}, pages = {35-41}, abstract = {

ASACUSA collaboration has been making a path to realize high precision microwave spectroscopy of ground-state hyperfine transitions of antihydrogen atom in flight for stringent test of the CPT symmetry. Recently, we have succeeded in synthesizing our first cold antihydrogen atoms employing a CUSP trap. It is expected that synthesized antihydrogen atoms in the low-field-seeking states are preferentially focused along the cusp magnetic field axis whereas those in the high-field-seeking states are not focused, resulting in the formation of a spin-polarized antihydrogen beam. We report the recent results of antihydrogen atom synthesis and beam production developed with the CUSP trap.

}, issn = {0304-3843}, url = {http://dx.doi.org/10.1007/s10751-012-0560-4}, author = {Kuroda, Naofumi and Enomoto, Yoshinori and Michishio, Koji and Kim, Chanhyoun and Higaki, Hiroyuki and Nagata, Yugo and Kanai, Yasuyuki and Torii, Hiroyuki and Corradini, Maurizzio and Leali, Marco and Lodi-Rizzini, Evandro and Mascagna, Valerio and Venturelli, Luca and Zurlo, Nicola and Fujii, Koki and Ohtsuka, Miki and Tanaka, Kazuo and Imao, Hiroshi and Nagashima, Yasuyuki and Matsuda, Yasuyuki and Juh{\'a}sz, Bertalan and Widmann, Eberhard and Mohri, Akihiro and Yamazaki, Yasunori} } @article {22, title = {Synthesis of Cold Antihydrogen in a Cusp Trap}, journal = {Physical Review LettersPhys. Rev. Lett.}, volume = {105}, year = {2010}, month = {2010/12/07/}, pages = {243401 -}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.105.243401}, author = {Enomoto, Y. and Kuroda, N. and Michishio, K. and Kim, C. H. and Higaki, H. and Nagata, Y. and Kanai, Y. and Torii, H. A. and Corradini, M. and Leali, M. and Lodi-Rizzini, E. and Mascagna, V. and Venturelli, L. and Zurlo, N. and Fujii, K. and Ohtsuka, M. and Tanaka, K. and Imao, H. and Nagashima, Y. and Matsuda, Y. and Juhasz, B. and Mohri, A. and Yamazaki, Y.} } @article {27, title = {Antiproton and Electron Plasma Behavior and its Control for Production of Ultraslow Antiproton Beams}, journal = {AIP Conference Proceedings}, volume = {796}, year = {2005}, pages = {321-324}, keywords = {plasma electrostatic waves, proton beams}, doi = {10.1063/1.2130188}, url = {http://link.aip.org/link/?APC/796/321/1}, author = {N. Kuroda and H. A. Torii and M. Shibata and Y. Nagata and D. Barna and M. Hori and A. Mohri and K. Komaki and Y. Yamazaki}, editor = {Dieter Grzonka and Rafa{\l} Czy{\.z}ykiewicz and Walter Oelert and Tomasz Ro{\.z}ek and Peter Winter} } @article {11, title = {Electron cooling of high-energy protons in a multiring trap with a tank circuit monitoring the electron-plasma oscillations}, journal = {Physical Review EPhys. Rev. E}, volume = {65}, year = {2002}, month = {2002/04/02/}, pages = {046410 -}, url = {http://link.aps.org/doi/10.1103/PhysRevE.65.046410}, author = {Higaki, H. and Kuroda, N. and Ichioka, T. and Franzen, K. Yoshiki and Wang, Z. and Komaki, K. and Yamazaki, Y. and Hori, M. and Oshima, N. and Mohri, A.} } @article {33, title = {Multi-ring trap as a reservoir of cooled antiprotons}, journal = {AIP Conference Proceedings}, volume = {498}, year = {1999}, pages = {59-64}, keywords = {antimatter, cooling, electric fields, electrodes, magnetic fields, particle traps, storage rings}, doi = {10.1063/1.1302101}, url = {http://link.aip.org/link/?APC/498/59/1}, author = {T. Ichioka and H. Higaki and M. Hori and N. Oshima and K. Kuroki and A. Mohri and K. Komaki and Y. Yamazaki}, editor = {John J. Bollinger and Ronald C. Davidson and Ross L. Spencer} }