The Experts below are selected from a list of 109785 Experts worldwide ranked by ideXlab platform
Kanetada Nagamine - One of the best experts on this subject based on the ideXlab platform.
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pulsed source of ultra low energy positive Muons for near surface μsr studies
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2008Co-Authors: Pavel Bakule, Yutaka Ikedo, P Strasser, Kanetada Nagamine, K. Shimomura, M Iwasaki, Yasuhiro Miyake, Y. Matsuda, Susumu MakimuraAbstract:Abstract We have produced a pulsed beam of low energy (ultra slow) polarized positive Muons (LE-μ+) and performed several demonstration muon spin rotation/relaxation (μSR) experiments at ISIS RIKEN-RAL muon facility in UK. The energy of the Muons implanted into a sample is tuneable between 0.1 keV and 18 keV. This allows us to use Muons as local magnetic microprobes on a nanometre scale. The control over the implantation depth is from several nanometres to hundreds of nanometres depending on the sample density and muon energy. The LE-μ+ are produced by two-photon resonant laser ionization of thermal muonium atoms. Currently ∼15 LE-μ+/s with 50% spin polarization are transported to the μSR sample position, where they are focused to a small spot with a diameter of only 4 mm. The overall LE-μ+ generation efficiency of 3 × 10−5 is comparable to that obtained when moderating the muon beam to epithermal energies in simple van der Waals bound solids. In contrast to other methods of LE-μ+ generation, the implantation of the Muons into the sample can be externally triggered with the duration of the LE-μ+ pulse being only 7.5 ns. This allows us to measure spin rotation frequencies of up to 40 MHz.
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Recent Development of a point positive muon source at the RIKEN‐RAL muon facility
AIP Conference Proceedings, 2004Co-Authors: Yasuyuki Matsuda, Pavel Bakule, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Patrick Strasser, Masahiko Iwasaki, Y. Miyake, Kanetada NagamineAbstract:We report recent progress of slow muon beam line constructed at the RIKEN‐RAL muon facility. The slow Muons are Muons which are re‐accelerated from the one at thermal velocity. This beam is expected to have very small emittance compared with conventional muon beam, where Muons are obtained from decays of pions at rest or on move. Especially, its smallness of energy spread will make it possible to apply μSR technique to the studies of thin films, multilayered systems, nanomaterials, and other objects of restricted dimensionality. Intense slow muon beams which can be realized at future neutrino factories will be a valuable tool for material science.
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Introductory Muon Science
2003Co-Authors: Kanetada NagamineAbstract:Muons are unstable elementary particles that are found in space, which can also be produced in particle accelerators to an intensity a billion times greater than that occurring naturally. This book describes the various applications of Muons across the spectrum of the sciences and engineering. Scientific research using Muons relies both on their basic properties as well as the microscopic interaction between them and surrounding particles such as nuclei, electrons, atoms and molecules. Examples of research that can be carried out using Muons include muon catalysis for nuclear fusion, the application of muon spin probes to study microscopic magnetic properties of advanced materials, electron labelling to help in the understanding of electron transfer in proteins, and non-destructive element analysis of the human body. Cosmic ray Muons can also be used to study the inner structure of volcanoes.
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The first observation of slow muon beam at the RIKEN-RAL muon facility
Physica B-condensed Matter, 2003Co-Authors: Yasuhiro H. Matsuda, Pavel Bakule, P Strasser, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Isao Watanabe, Yasuhiro Miyake, Kanetada NagamineAbstract:We report successful observation of the first slow muon beam at the RIKEN-RAL muon facility. We adopted the laser resonant ionization method which had been developed at KEK to generate slow Muons. The realization of the slow muon beam at the most powerful pulsed muon source in the world will open new possibilities for the studies of condensed matter with μSR techniques.
H Abramowicz - One of the best experts on this subject based on the ideXlab platform.
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Measurement of azimuthal anisotropy of Muons from charm and bottom hadrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Phys.Rev.Lett., 2020Co-Authors: G Aad, B Abbott, Deshan Kavishka Abhayasinghe, S H Abidi, Ossama Abouzeid, Nicola Abraham, Dale Charles Abbott, Adam Abed Abud, Kira Abeling, H AbramowiczAbstract:The elliptic flow of Muons from the decay of charm and bottom hadrons is measured in pp collisions at s=13 TeV using a data sample with an integrated luminosity of 150 pb-1 recorded by the ATLAS detector at the LHC. The Muons from heavy-flavor decay are separated from light-hadron decay Muons using momentum imbalance between the tracking and muon spectrometers. The heavy-flavor decay Muons are further separated into those from charm decay and those from bottom decay using the distance-of-closest-approach to the collision vertex. The measurement is performed for Muons in the transverse momentum range 4–7 GeV and pseudorapidity range |η|
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observation of centrality dependent acoplanarity for muon pairs produced via two photon scattering in pb pb collisions at snn 5 02 tev with the atlas detector
Physical Review Letters, 2018Co-Authors: M Aaboud, G Aad, B Abbott, O Abdinov, B Abeloos, Deshan Kavishka Abhayasinghe, S H Abidi, Ossama Abouzeid, N L Abraham, H AbramowiczAbstract:This Letter presents a measurement of γγ→μ^{+}μ^{-} production in Pb+Pb collisions recorded by the ATLAS detector at the Large Hadron Collider at sqrt[s_{NN}]=5.02 TeV with an integrated luminosity of 0.49 nb^{-1}. The azimuthal angle and transverse momentum correlations between the Muons are measured as a function of collision centrality. The muon pairs are produced from γγ through the interaction of the large electromagnetic fields of the nuclei. The contribution from background sources of muon pairs is removed using a template fit method. In peripheral collisions, the Muons exhibit a strong back-to-back correlation consistent with previous measurements of muon pair production in ultraperipheral collisions. The angular correlations are observed to broaden significantly in central collisions. The modifications are qualitatively consistent with rescattering of the Muons while passing through the hot matter produced in the collision.
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Observation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
Phys.Rev.Lett., 2018Co-Authors: M Aaboud, G Aad, B Abbott, O Abdinov, B Abeloos, Deshan Kavishka Abhayasinghe, S H Abidi, Ossama Abouzeid, Nicola Abraham, H AbramowiczAbstract:This Letter presents a measurement of γγ→μ+μ- production in Pb+Pb collisions recorded by the ATLAS detector at the Large Hadron Collider at sNN=5.02 TeV with an integrated luminosity of 0.49 nb-1. The azimuthal angle and transverse momentum correlations between the Muons are measured as a function of collision centrality. The muon pairs are produced from γγ through the interaction of the large electromagnetic fields of the nuclei. The contribution from background sources of muon pairs is removed using a template fit method. In peripheral collisions, the Muons exhibit a strong back-to-back correlation consistent with previous measurements of muon pair production in ultraperipheral collisions. The angular correlations are observed to broaden significantly in central collisions. The modifications are qualitatively consistent with rescattering of the Muons while passing through the hot matter produced in the collision.
Susumu Makimura - One of the best experts on this subject based on the ideXlab platform.
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New Muon Kicker System for the Decay Muon Beamline at J-PARC
Physics Procedia, 2012Co-Authors: P Strasser, Susumu Makimura, Hiroshi Fujimori, Kazuo Koseki, Akihiro Koda, Koichiro Shimomura, Y Hori, Hiroshi Matsumoto, Naritoshi Kawamura, M. KatoAbstract:Abstract At J-PARC Muon Science Facility a conventional superconducting decay muon beamline (D-Line) was constructed that can extract surface (positive) Muons and decay positive/negative Muons up to 120 MeV/c. This beamline will be used for various kinds of muon experiments like μSR, muon catalyzed fusion and nondestructive elements analysis. Similarly to the ISIS facility at RAL, the muon beam produced at J-PARC has a double-pulsed structure. To utilize the muon beam more efficiently, a muon kicker system will be installed to separate the double-pulsed beam and send the two pulses to two experimental areas simultaneously, allowing μSR experiments with single-pulsed Muons. A muon kicker system, comprising two magnetic kicker magnets, two switchyard magnets and a septum magnet, is now been constructed. Single-pulsed muon beam up to 60 MeV/c can be transported. New state-of-the-art power supplies are also been fabricated. The installation in the beamline is planned in summer 2011.
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pulsed source of ultra low energy positive Muons for near surface μsr studies
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2008Co-Authors: Pavel Bakule, Yutaka Ikedo, P Strasser, Kanetada Nagamine, K. Shimomura, M Iwasaki, Yasuhiro Miyake, Y. Matsuda, Susumu MakimuraAbstract:Abstract We have produced a pulsed beam of low energy (ultra slow) polarized positive Muons (LE-μ+) and performed several demonstration muon spin rotation/relaxation (μSR) experiments at ISIS RIKEN-RAL muon facility in UK. The energy of the Muons implanted into a sample is tuneable between 0.1 keV and 18 keV. This allows us to use Muons as local magnetic microprobes on a nanometre scale. The control over the implantation depth is from several nanometres to hundreds of nanometres depending on the sample density and muon energy. The LE-μ+ are produced by two-photon resonant laser ionization of thermal muonium atoms. Currently ∼15 LE-μ+/s with 50% spin polarization are transported to the μSR sample position, where they are focused to a small spot with a diameter of only 4 mm. The overall LE-μ+ generation efficiency of 3 × 10−5 is comparable to that obtained when moderating the muon beam to epithermal energies in simple van der Waals bound solids. In contrast to other methods of LE-μ+ generation, the implantation of the Muons into the sample can be externally triggered with the duration of the LE-μ+ pulse being only 7.5 ns. This allows us to measure spin rotation frequencies of up to 40 MHz.
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Recent Development of a point positive muon source at the RIKEN‐RAL muon facility
AIP Conference Proceedings, 2004Co-Authors: Yasuyuki Matsuda, Pavel Bakule, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Patrick Strasser, Masahiko Iwasaki, Y. Miyake, Kanetada NagamineAbstract:We report recent progress of slow muon beam line constructed at the RIKEN‐RAL muon facility. The slow Muons are Muons which are re‐accelerated from the one at thermal velocity. This beam is expected to have very small emittance compared with conventional muon beam, where Muons are obtained from decays of pions at rest or on move. Especially, its smallness of energy spread will make it possible to apply μSR technique to the studies of thin films, multilayered systems, nanomaterials, and other objects of restricted dimensionality. Intense slow muon beams which can be realized at future neutrino factories will be a valuable tool for material science.
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The first observation of slow muon beam at the RIKEN-RAL muon facility
Physica B-condensed Matter, 2003Co-Authors: Yasuhiro H. Matsuda, Pavel Bakule, P Strasser, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Isao Watanabe, Yasuhiro Miyake, Kanetada NagamineAbstract:We report successful observation of the first slow muon beam at the RIKEN-RAL muon facility. We adopted the laser resonant ionization method which had been developed at KEK to generate slow Muons. The realization of the slow muon beam at the most powerful pulsed muon source in the world will open new possibilities for the studies of condensed matter with μSR techniques.
Koichiro Shimomura - One of the best experts on this subject based on the ideXlab platform.
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Initial quantum levels of captured Muons in CO, CO_2, and COS
Journal of Radioanalytical and Nuclear Chemistry, 2019Co-Authors: Go Yoshida, Koichiro Shimomura, Naritoshi Kawamura, Yasuhiro Miyake, Patrick Strasser, Kazuhiko Ninomiya, Wataru Higemoto, Makoto Inagaki, Taichi Miura, Kenya M. KuboAbstract:The role of valence electrons for the muon capture process by molecules is experimentally investigated with the aid of cascade calculations. Low-momentum Muons are introduced to gas targets of CO, CO_2, and COS below atmospheric pressure. The initial states of captured Muons are determined from the measured muonic X-ray structure of the Lyman and Balmer series. We propose that the lone pair electrons in the carbon atom of CO significantly contribute to the capture of a muon with large angular momenta.
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New Muon Kicker System for the Decay Muon Beamline at J-PARC
Physics Procedia, 2012Co-Authors: P Strasser, Susumu Makimura, Hiroshi Fujimori, Kazuo Koseki, Akihiro Koda, Koichiro Shimomura, Y Hori, Hiroshi Matsumoto, Naritoshi Kawamura, M. KatoAbstract:Abstract At J-PARC Muon Science Facility a conventional superconducting decay muon beamline (D-Line) was constructed that can extract surface (positive) Muons and decay positive/negative Muons up to 120 MeV/c. This beamline will be used for various kinds of muon experiments like μSR, muon catalyzed fusion and nondestructive elements analysis. Similarly to the ISIS facility at RAL, the muon beam produced at J-PARC has a double-pulsed structure. To utilize the muon beam more efficiently, a muon kicker system will be installed to separate the double-pulsed beam and send the two pulses to two experimental areas simultaneously, allowing μSR experiments with single-pulsed Muons. A muon kicker system, comprising two magnetic kicker magnets, two switchyard magnets and a septum magnet, is now been constructed. Single-pulsed muon beam up to 60 MeV/c can be transported. New state-of-the-art power supplies are also been fabricated. The installation in the beamline is planned in summer 2011.
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Recent Development of a point positive muon source at the RIKEN‐RAL muon facility
AIP Conference Proceedings, 2004Co-Authors: Yasuyuki Matsuda, Pavel Bakule, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Patrick Strasser, Masahiko Iwasaki, Y. Miyake, Kanetada NagamineAbstract:We report recent progress of slow muon beam line constructed at the RIKEN‐RAL muon facility. The slow Muons are Muons which are re‐accelerated from the one at thermal velocity. This beam is expected to have very small emittance compared with conventional muon beam, where Muons are obtained from decays of pions at rest or on move. Especially, its smallness of energy spread will make it possible to apply μSR technique to the studies of thin films, multilayered systems, nanomaterials, and other objects of restricted dimensionality. Intense slow muon beams which can be realized at future neutrino factories will be a valuable tool for material science.
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The first observation of slow muon beam at the RIKEN-RAL muon facility
Physica B-condensed Matter, 2003Co-Authors: Yasuhiro H. Matsuda, Pavel Bakule, P Strasser, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Isao Watanabe, Yasuhiro Miyake, Kanetada NagamineAbstract:We report successful observation of the first slow muon beam at the RIKEN-RAL muon facility. We adopted the laser resonant ionization method which had been developed at KEK to generate slow Muons. The realization of the slow muon beam at the most powerful pulsed muon source in the world will open new possibilities for the studies of condensed matter with μSR techniques.
Pavel Bakule - One of the best experts on this subject based on the ideXlab platform.
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pulsed source of ultra low energy positive Muons for near surface μsr studies
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2008Co-Authors: Pavel Bakule, Yutaka Ikedo, P Strasser, Kanetada Nagamine, K. Shimomura, M Iwasaki, Yasuhiro Miyake, Y. Matsuda, Susumu MakimuraAbstract:Abstract We have produced a pulsed beam of low energy (ultra slow) polarized positive Muons (LE-μ+) and performed several demonstration muon spin rotation/relaxation (μSR) experiments at ISIS RIKEN-RAL muon facility in UK. The energy of the Muons implanted into a sample is tuneable between 0.1 keV and 18 keV. This allows us to use Muons as local magnetic microprobes on a nanometre scale. The control over the implantation depth is from several nanometres to hundreds of nanometres depending on the sample density and muon energy. The LE-μ+ are produced by two-photon resonant laser ionization of thermal muonium atoms. Currently ∼15 LE-μ+/s with 50% spin polarization are transported to the μSR sample position, where they are focused to a small spot with a diameter of only 4 mm. The overall LE-μ+ generation efficiency of 3 × 10−5 is comparable to that obtained when moderating the muon beam to epithermal energies in simple van der Waals bound solids. In contrast to other methods of LE-μ+ generation, the implantation of the Muons into the sample can be externally triggered with the duration of the LE-μ+ pulse being only 7.5 ns. This allows us to measure spin rotation frequencies of up to 40 MHz.
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Recent Development of a point positive muon source at the RIKEN‐RAL muon facility
AIP Conference Proceedings, 2004Co-Authors: Yasuyuki Matsuda, Pavel Bakule, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Patrick Strasser, Masahiko Iwasaki, Y. Miyake, Kanetada NagamineAbstract:We report recent progress of slow muon beam line constructed at the RIKEN‐RAL muon facility. The slow Muons are Muons which are re‐accelerated from the one at thermal velocity. This beam is expected to have very small emittance compared with conventional muon beam, where Muons are obtained from decays of pions at rest or on move. Especially, its smallness of energy spread will make it possible to apply μSR technique to the studies of thin films, multilayered systems, nanomaterials, and other objects of restricted dimensionality. Intense slow muon beams which can be realized at future neutrino factories will be a valuable tool for material science.
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The first observation of slow muon beam at the RIKEN-RAL muon facility
Physica B-condensed Matter, 2003Co-Authors: Yasuhiro H. Matsuda, Pavel Bakule, P Strasser, Susumu Makimura, Teiichiro Matsuzaki, Katsuhiko Ishida, Koichiro Shimomura, Isao Watanabe, Yasuhiro Miyake, Kanetada NagamineAbstract:We report successful observation of the first slow muon beam at the RIKEN-RAL muon facility. We adopted the laser resonant ionization method which had been developed at KEK to generate slow Muons. The realization of the slow muon beam at the most powerful pulsed muon source in the world will open new possibilities for the studies of condensed matter with μSR techniques.
