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3. Neutron lifetime experiment with pulsed cold neutrons at J-PARC

Author

Go Ichikawa, Yasuhiro Fuwa, Takuro Hasegawa, Masahiro Hino, Katsuya Hirota, Takashi Ino, Yoshihisa Iwashita, Masaaki Kitaguchi, Jun Koga, Shun Matsuzaki, Kenji Mishima, Takanori Mogi, Koki Morikawa, Hiroki Okabe, Hidetoshi Otono, Yoshichika Seki, Daiichiro Sekiba, Tatsushi Shima, Haruki Shimizu, Hirohiko M. Shimizu, Naoyuki Sumi, Hirochika Sumino, Satoru Yamashita, Kodai Yano, and Tamaki Yoshioka

Published
2022

4. Improvement of systematic uncertainties for the neutron lifetime experiment at J-PARC

Author

Takanori Mogi, Takuro Hasegawa, Katsuya Hirota, Go Ichikawa, Sei Ieki, Takashi Ino, Yoshihisa Iwashita, Shogo Kajiwara, Yu Kato, Masaaki Kitaguchi, Ryunosuke Kitahara, Jun Koga, So Makise, Shun Matsuzaki, Kenji Mishima, Koki Morikawa, Naoki NAGAKURA, Hiroki Okabe, Hidetoshi Otono, Yoshichika Seki, Daiichiro Sekiba, Tatsushi Shima, Haruki Shimizu, Hirohiko M. Shimizu, Yuki Sugisawa, Naoyuki Sumi, Hirochika Sumino, Tomohiko Tanabe, Tatsuhiko TOMITA, Hideaki Uehara, Takahito Yamada, Satoru Yamashita, Kodai Yano, and Tamaki Yoshioka

Published
2022

5. Study of the Unit-3 nuclear reactor of Fukushima Daiichi by cosmic muon radiography

Author

Hirofumi Fujii, Kazuhiko Hara, Kohei Hayashi, Hidekazu Kakuno, Hideyo Kodama, Kanetada Nagamine, Kotaro Sato, Shin-Hong Kim, Atsuto Suzuki, Takayuki Sumiyoshi, Fumihiko Takasaki, Shuji Tanaka, Satoru Yamashita, Shinya Mizokami, and Daichi Yamada

Subjects
General Physics and Astronomy
Abstract

We have investigated the status of the nuclear debris in the Unit-3 nuclear reactor of the Fukushima Daiichi nuclear power plant by the method called cosmic muon radiography. We used the same telescope system which was used to study the Unit-2 reactor. As in the previous studies, we succeeded in identifying the inner structure of the reactor, such as the containment vessel and other structures of the reactor complex, through the thick concrete wall of the reactor building. We evaluated the amount of material remaining in the fuel loading zone, and conclude that most of the original fuel materials have melted and dropped from the loading zone.

Published
2021

7. Precise Neutron Lifetime Measurement Using Pulsed Neutron Beams at J-PARC

Author

Hideyuki Oide, Tamaki Yoshioka, Hirohiko M. Shimizu, T. Shima, Takashi Ino, K. Yano, H. Okabe, K. Morikawa, Y. Kato, T. Tanabe, G. Ichikawa, Hidetoshi Otono, Satoru Yamashita, Y. Iwashita, S. Kajiwara, Katsuya Hirota, T. Mogi, Kenji Mishima, Y. Sugisawa, Masaaki Kitaguchi, and Naoyuki Sumi

Subjects
Physics, Time projection chamber, Proton, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Weak interaction, Neutron radiation, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Neutron flux, Nucleosynthesis, High Energy Physics::Experiment, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure)
Abstract

A neutron decays into a proton, an electron, and an anti-neutrino through the beta-decay process. The decay lifetime ($\sim$880 s) is an important parameter in the weak interaction. For example, the neutron lifetime is a parameter used to determine the |$V_{\rm ud}$| parameter of the CKM quark mixing matrix. The lifetime is also one of the input parameters for the Big Bang Nucleosynthesis, which predicts light element synthesis in the early universe. However, experimental measurements of the neutron lifetime today are significantly different (8.4 s or 4.0$\sigma$) depending on the methods. One is a bottle method measuring surviving neutron in the neutron storage bottle. The other is a beam method measuring neutron beam flux and neutron decay rate in the detector. There is a discussion that the discrepancy comes from unconsidered systematic error or undetectable decay mode, such as dark decay. A new type of beam experiment is performed at the BL05 MLF J-PARC. This experiment measured neutron flux and decay rate simultaneously with a time projection chamber using a pulsed neutron beam. We will present the world situation of neutron lifetime and the latest results at J-PARC., Comment: 8 pages, 6 figures, Proceedings of J-PARC Symposium 2019

Published
2021

8. Neutron lifetime measurement with pulsed cold neutrons

Author

Masaaki Kitaguchi, Y. Seki, Naoyuki Sumi, Tatsuhiro Yamada, K. Yano, H. Okabe, Yoshihisa Iwashita, T. Tomita, Ryunosuke Kitahara, Hideyuki Oide, A. Morishita, Hidetoshi Otono, Tamaki Yoshioka, Katsuya Hirota, T. Mogi, H. Uehara, Hirohiko M. Shimizu, T. Shima, S. Ieki, Kenji Mishima, M. Yokohashi, Hirochika Sumino, Go Ichikawa, Jun Koga, Daiichiro Sekiba, Takashi Ino, Satoru Yamashita, Naoki Nagakura, and K. Morikawa

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, Gas chamber, Electron, 01 natural sciences, law.invention, High Energy Physics - Experiment, Nuclear physics, Reaction rate, High Energy Physics - Experiment (hep-ex), law, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Particle accelerator, Neutron radiation, Physics::Accelerator Physics, High Energy Physics::Experiment, Spallation Neutron Source
Abstract

The neutron lifetime has been measured by comparing the decay rate with the reaction rate of $^3$He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator Research Complex (J-PARC). The decay rate and the reaction rate were determined by simultaneously detecting electrons from the neutron decay and protons from the $^3$He(n,p)$^3$H reaction using a gas chamber of which working gas contains diluted $^3$He. The measured neutron lifetime was $898\,\pm\,10\,_{\rm stat}\,^{+15}_{-18}\,_{\rm sys}\,$s., 28 pages, 20 figures, will be submitted to PTEP

Published
2020

9. Investigation of the status of Unit 2 nuclear reactor of the Fukushima Daiichi by Cosmic Muon Radiography

Author

Yoshihisa Takada, Kazuhiko Hara, Shinya Mizokami, Kazuki Takahashi, Hidekazu Kakuno, Shinhong Kim, Shunsuke Sekita, Masato Mizokami, Satoru Yamashita, Kanetada Nagamine, Kotaro Sato, H. Fujii, Yu Takahashi, Shugo Hashimoto, Hiroshi Shirai, A. Suzuki, Kohei Hayashi, Hideyo Kodama, Fumihiko Takasaki, T. Sumiyoshi, Meiki Gi, and Daichi Yamada

Subjects
Physics, Fukushima daiichi, COSMIC cancer database, law, Nuclear engineering, Muon radiography, General Physics and Astronomy, Nuclear reactor, law.invention
Abstract

We have investigated the status of the nuclear debris in the Unit-2 Nuclear Reactor of the Fukushima Daiichi Nuclear Power plant by the method called Cosmic Muon Radiography. In this measurement, the muon detector was placed outside of the reactor building, as was the case of the measurement for the Unit-1 Reactor. Compared to the previous measurements, the detector was down-sized, which made it possible for us to locate it closer to the reactor and to investigate the lower part of the fuel loading zone in particular. We identified the inner structures of the reactor such as the containment vessel, pressure vessel and other objects through the thick concrete wall of the reactor building. Furthermore, the observation showed existence of heavy material at the bottom of the pressure vessel, which can be interpreted as the debris of melted nuclear fuel dropped from the loading zone.

Published
2020

10. New project for precise neutron lifetime measurement at J-PARC

Author

Hideaki Uehara, Tamaki Yoshioka, Yoshihisa Iwashita, Takashi Ino, Hirochika Sumino, Daiichiro Sekiba, T. Tomita, Kaoru Taketani, Hideyuki Oide, Hirohiko M. Shimizu, Yusuke Nakano, Satoru Yamashita, Yoshichika Seki, Naoki Nagakura, Hidetoshi Otono, Jun Koga, Naoyuki Sumi, Takahito Yamada, Katsuya Hirota, Masaaki Kitaguchi, M. Yokohashi, Ryunosuke Kitahara, A. Morishita, S. Ieki, Hiroki Okabe, Tatsushi Shima, and Kenji Mishima

Subjects
Physics, Time projection chamber, 010308 nuclear & particles physics, QC1-999, Particle accelerator, Neutron radiation, 01 natural sciences, law.invention, Nuclear physics, Chopper, Big Bang nucleosynthesis, law, 0103 physical sciences, Physics::Accelerator Physics, Neutron, J-PARC, 010306 general physics, Beam (structure)
Abstract

The decay lifetime of free neutrons (∼880 s) is an important parameter of the weak interaction and for Big Bang Nucleosynthesis. However, results of measurements currently show discrepancies depending on the method used. As most experiments nowadays employ ultra cold neutrons, we have developed a new cold-beam experiment which we perform at the Japan Proton Accelerator Research Complex. As a special feature, a polarized neutron beam is bunched by a spin flip chopper. A time projection chamber operated with He and CO2gas, including a well-controlled amount of3He, is used for detection of the beta-decays and simultaneous determination of the beam intensity. Using the data between 2014 and 2016, we evaluated our first, preliminary result of the neutron lifetime as 896 ± 10(stat.)−10+14(sys.) s. We plan several upgrades to achieve our precision goal of 1 s.

Published
2019

11. Investigation of the Unit-1 nuclear reactor of Fukushima Daiichi by cosmic muon radiography

Author

Fumihiko Takasaki, T. Sumiyoshi, Kanetada Nagamine, Kazuki Takahashi, Hideyo Kodama, Hidekazu Kakuno, Kohei Hayashi, Satoshi Tanaka, Satoru Yamashita, A. Suzuki, H. Fujii, Kotaro Sato, Kazuhiko Hara, and Shinhong Kim

Subjects
Physics, COSMIC cancer database, Muon, Nuclear fuel, 010308 nuclear & particles physics, Nuclear engineering, General Physics and Astronomy, Nuclear reactor, Tracking (particle physics), 01 natural sciences, Pressure vessel, law.invention, Containment, law, 0103 physical sciences, Nuclear power plant, 010306 general physics
Abstract

We have investigated the status of the nuclear fuel assemblies in the Unit-1 reactor of the Fukushima Daiichi nuclear power plant by cosmic muon radiography. In this study, muon tracking detectors were placed outside the reactor building. We succeeded in identifying the inner structure of the reactor complex, such as the reactor containment vessel, pressure vessel, and other structures of the reactor building, through the concrete wall of the reactor building. We found that a large number of fuel assemblies were missing in the original fuel loading zone inside the pressure vessel. The natural interpretation is that most of the nuclear fuel was melted and dropped down to the bottom of the pressure vessel or even below.

Published
2020

12. Ultracold Neutron Time Focusing Experiment with an Improved UCN Rebuncher at J-PRAC/MLF

Author

Katsuya Hirota, Yoshihisa Iwashita, Masaaki Kitaguchi, Sohei Imajo, Ryo Katayama, Yasuhiro Fuwa, Hirohiko M. Shimizu, Takashi Ino, Fumiya Goto, Kenji Mishima, and Satoru Yamashita

Subjects
Nuclear physics, Physics, Physics::Instrumentation and Detectors, Physics::Accelerator Physics, Neutron, Nuclear Experiment
Abstract

We developed and improved an ultracold neutron (UCN) rebuncher, a UCN accelerator that can control the longitudinal velocity of UCNs by a combination of an adiabatic fast passage spin-flip and a gradient magnetic field and focus UCNs on a point. We have proposed the construction of a new spallation neutron source, production of highly dense and low repetition rate pulsed UCN beams, and neutron electric dipole moment (EDM) measurements with UCNs at the Japan Proton Accelerator Research Complex (J-PARC). The purpose of the rebuncher is to recover the spatial density of the pulsed UCNs, which diffuse during transport in the experiment, by focusing them at the storage bottle. Although the present rebuncher is still a prototype, it is one of the most important tools in our neutron EDM experiment. The UCN focusing experiment with the improved rebuncher was carried out at Beamline 5 of the Materials and Life Science Experiment Facility (MLF) at J-PARC. We succeeded in decelerating 5.5 m/s pulsed UCNs produced by our neutron Doppler shifter and focusing them to achieve synchronization with 4.7 m/s UCNs. As a result, the corresponding count rate in the time-of-flight spectrum was increased by 2 times.

Published
2018

13. Development of New Neutron Mirrors for Measuring the Neutron Electric Dipole Moment

Author

Mikiko Saito, Masahiko Mitsuhashi, Norifumi L. Yamada, Masahiko Sugihara, Masahiro Hino, Daiju Tsuya, Ryo Katayama, Masaaki Kitaguchi, Satoru Yamashita, Eiichiro Watanabe, Kenji Mishima, Tamaki Yoshioka, and Yoshichika Seki

Subjects
Nuclear physics, Physics, Neutron electric dipole moment, Neutron, Development (differential geometry)
Published
2018

15. Fundamental physics activities with pulsed neutron at J-PARC(BL05)

Author

Christopher C. Haddock, T. Tomita, Naotaka Naganawa, T. Shima, S. Imajo, Tamaki Yoshioka, Hirohiko M. Shimizu, Hidetoshi Otono, S. Awano, M. Yokohashi, M. Hirose, Naoyuki Sumi, Masahiro Hino, Takahito Yamada, Yasuhiro Fuwa, Jun Koga, Noriko Oi, Satoru Yamashita, S. Tasaki, Yoshichika Seki, Naoki Nagakura, A. Umemoto, S. Ieki, Kaoru Taketani, Hirochika Sumino, Katsuya Hirota, Kenji Mishima, Takashi Ino, S. Tada, Hiroaki Kawahara, Ryo Katayama, Daiichiro Sekiba, Fumiya Goto, Y. Iwashita, Masaaki Kitaguchi, Ryunosuke Kitahara, A. Morishita, W. M. Snow, Tomofumi Nagae, and Hideyuki Oide

Subjects
Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Detector, FOS: Physical sciences, Elementary particle, Instrumentation and Detectors (physics.ins-det), Neutron scattering, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Beamline, Neutron detection, Neutron, J-PARC, Nuclear Experiment, Beam (structure)
Abstract

"Neutron Optics and Physics (NOP/ BL05)" at MLF in J-PARC is a beamline for studies of fundamental physics. The beamline is divided into three branches so that different experiments can be performed in parallel. These beam branches are being used to develop a variety of new projects. We are developing an experimental project to measure the neutron lifetime with total uncertainty of 1 s (0.1%). The neutron lifetime is an important parameter in elementary particle and astrophysics. Thus far, the neutron lifetime has been measured by several groups; however, different values are obtained from different measurement methods. This experiment is using a method with different sources of systematic uncertainty than measurements conducted to date. We are also developing a source of pulsed ultra-cold neutrons (UCNs) produced from a Doppler shifter are available at the unpolarized beam branch. We are developing a time focusing device for UCNs, a so called "rebuncher", which can increase UCN density from a pulsed UCN source. At the low divergence beam branch, an experiment to search an unknown intermediate force with nanometer range is performed by measuring the angular dependence of neutron scattering by noble gases. Finally the beamline is also used for the research and development of optical elements and detectors. For example, a position sensitive neutron detector that uses emulsion to achieve sub-micrometer resolution is currently under development. We have succeeded in detecting cold and ultra-cold neutrons using the emulsion detector., 9 pages, 5 figures, Proceedings of International Conference on Neutron Optics (NOP2017)

Published
2017

16. A case of esophagus ESD with the permanent pacemaker

Author

Hisashi Hosaka and Satoru Yamashita

Subjects
medicine.medical_specialty, medicine.anatomical_structure, business.industry, Mechanical Engineering, medicine, Energy Engineering and Power Technology, Management Science and Operations Research, Esophagus, Permanent pacemaker, business, Surgery
Published
2018

17. Development of time projection chamber for precise neutron lifetime measurement using pulsed cold neutron beams

Author

Satoru Yamashita, Yasushi Arimoto, Tamaki Yoshioka, Naoyuki Sumi, Naoki Nagakura, Harumichi Yokoyama, Ryo Katayama, Genki Tanaka, Tomoaki Sugino, Hirohiko M. Shimizu, T. Tomita, Nao Higashi, Tatsuhiro Yamada, Hideyuki Oide, Momoko Tanaka, K. Tauchi, Yoshihisa Iwashita, Hirochika Sumino, Akihisa Toyoda, K. Taketani, Y. Igarashi, Kenji Mishima, Hiroshi Matsumura, Takashi Ino, Hidetoshi Otono, Tatsushi Shima, Ryunosuke Kitahara, Risa Sakakibara, and Masaaki Kitaguchi

Subjects
Physics, Nuclear and High Energy Physics, Time projection chamber, Physics - Instrumentation and Detectors, business.industry, FOS: Physical sciences, Particle accelerator, Instrumentation and Detectors (physics.ins-det), law.invention, Nuclear physics, Optics, law, Spallation, Neutron, Nuclear Experiment (nucl-ex), business, Instrumentation, Nuclear Experiment, Beam (structure)
Abstract

A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J-PARC). Managing considerable background events from natural sources and the beam radioactivity is a challenging aspect of this measurement. To overcome this problem, the developed TPC has unprecedented features such as the use of polyether-ether-ketone plates in the support structure and internal surfaces covered with $^6$Li-enriched tiles to absorb outlier neutrons. In this paper, the design and performance of the new TPC are reported in detail., 33 pages, 10 figures

Published
2015

18. Effect of Process Temperature of Al2O3 Atomic Layer Deposition Using Accurate Process Gasses Supply System

Author

Hisaya Sugita, Tetsuya Goto, Shigetoshi Sugawa, Tadahiro Ohmi, Satoru Yamashita, Tomoyuki Suwa, Hidekazu Ishii, Yasumasa Koda, Akinobu Teramoto, and Rihito Kuroda

Subjects
Imagination, Atomic layer deposition, Materials science, Chemical substance, business.industry, Scientific method, media_common.quotation_subject, Optoelectronics, Science, technology and society, business, Algorithm, media_common
Abstract

Introduction On-chip capacitors are used for various purposes in electronic devices, for example, AC coupling capacitors, bypass capacitors, sample and hold circuits for analog signals, and so on. For these purposes, a high capacitance density is required for on- chip capacitors in order to shrink the chip size or to reduce the thermal noise. However, it has been difficult to minimize the capacitor size with a same capacitance owing to stagnation of capacitance density improvement [1]. To maintain the capacitance with a small capacitor size and a same dielectric material used, the dielectric film thickness must be thinner. However, an excess shrinking of the thickness of dielectric film causes the large leakage current and degrades the reliability. Therefore, an introduction of high-k material is a very efficient way to increase the capacitance density. In particular, Al2O3, HfO2, and ZrO2have been extensively studied as candidates for dielectric materials of metal-insulator-metal capacitors [2-4]. Atomic layer deposition (ALD) is one of the most promising methods, because a good step coverage is obtained and the process temperature is relatively low. Most ALD is carried out at around 300 oC [4][5] , it is considered that the temperature of ALD is one of important parameter in relation to supply the metal organic (MO) gasses, such as Trimethylaluminum (TMA). In this paper, using the developed ALD process equipment with high accurate gas flow system adapted to high temperature usage, the impact of the process temperature on the electrical characteristics was investigated. Experiment Cz-n type 33mm Si wafers (8-12Wcm) were used. MOS capacitors were fabricated as follows. Si wafers were cleaned to remove native oxide film by diluted HF (DHF 5%), and after that Al2O3films were deposited on Si surface directly by ALD, followed by forming gate and bottom electrodes of Al by the evaporation, respectively. Electrical characteristics (I-V, C-V) were measured at five points on each wafer. Figure 1 shows the ALD sequence. At first H2O was injected 1sec to make Si surface OH-terminated, after that the following ALD cycle was started. TMA was injected 1 sec, and H2O was injected 1 sec for oxidation. This cycle was repeated until the Al2O3 film thickness is about 20 nm. The following gas purge was repeated 4 times every time before TMA or H2O was injected. Ar was purged, by changing pressure in the reactor chamber from 133 to 27 Pa, and getting back to 133 Pa. Here, TMA gas was accurately supplied as follows. TMA was supplied as vaporized gases, with heated to 60 oC (TMA vapor pressure: 9 kPa). In addition, the tube supplying the TMA gas was also heated to 60 oC to keep TMA gaseous. The TMA gas flow rate of 3 sccm was controlled by flow control system (FCS) adapted to high temperature usage [6]. We prepared three kind of Al2O3 films formed at (a)room temperature (RT), (b)150 oC, and (c)300 oC. Result and Discussion Figure 2 shows J-E characteristics of Al2O3 films formed at (a)RT, (b)150oC, and (c)300oC. The variation of J-E characteristic increases, with the temperature increasing. As the result, The RT sample has small variation and high breakdown field intensity. Figure 3 shows growth rate per cycle as a function of temperature. The average, maximum, and minimum values are also plotted on respectively. It is found that the growth rate and its variability increase, with the temperature increasing. Only RT case, the uniformity of the growth rate is good and the value is about 0.3 nm/cycle , which is almost as same as the monolayer Al2O3. However, the growth rates of the others are larger than the thickness of monolayer, and theirs variability is very large. These means that the complete ALD was performed at only RT, while the others’ deposition mechanisms were occurred at relatively high temperature. It is suggested that the decomposition of TMA occurred not only at over 300oC but also at 150oC. And almost no decomposition occurs at RT, so that the high quality Al2O3films are formed. These data indicated it is important that maintaining the process temperature in order to go on the ALD reaction on the surface, and not to decompose MO gasses. Reference [1]M. L. Green, et al., Microelectronic Eng., 48(1999) 25 [2]S. Becu, et al., Microelectronic Eng., 83(2006) 2422 [3]Xiongfei Yu, et al., IEEE electron device letters, 24(2003) 63 [4]Joo-Hyung Kim, et al., Thin Solid Films, 516(2008) 8333 [5]Min-Jung Choi, et al., Applied Surface Science, 301(2014) 451 [6]Michio Yamaji, et al., ECS Trans, 45 (2012) 429 Figure 1

Published
2015

20. Precise Neutron Lifetime Experiment Using Pulsed Neutron Beams At J-PARC

Author

A. Morishita, Risa Sakakibara, Masaaki Kitaguchi, T. Tomita, Hidetoshi Otono, Mami Yokohashi, Tatsushi Shima, Naoyuki Sumi, Hirohiko M. Shimizu, Tomoaki Sugino, S. Ieki, Yoshihisa Iwashita, Takashi Ino, Kaoru Taketani, Satoru Yamashita, Katsuya Hirota, Tamaki Yoshioka, Kenji Mishima, Naoki Nagakura, Hirochika Sumino, Hideyuki Oide, Yoshichika Seki, Takahito Yamada, Genki Tanaka, and Ryunosuke Kitahara

Subjects
Physics, Physics - Instrumentation and Detectors, media_common.quotation_subject, Radiochemistry, Measure (physics), FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Neutron scattering, Weak interaction, Universe, Nuclear physics, Neutron detection, Neutron, J-PARC, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure), media_common
Abstract

The neutron lifetime is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure the lifetime with the goal precision of 0.1% at the polarized beam branch BL05 of MLF, J-PARC. The commissioning data was acquired in 2014 and 2015, and the first set of data to evaluate the lifetime in 2016, which is expected to yield a statistical uncertainty of O(1)%. This paper presents the current analysis results and the future plans to achieve our goal precision., Comment: 8 pages, 7 figures, 2 tables, the 26th International Nuclear Physics Conference

Published
2017

21. Imaging the inner structure of a nuclear reactor by cosmic muon radiography

Author

T. Sumiyoshi, Kazuhiko Hara, Shinhong Kim, Hidekazu Kakuno, Shogo Hashimoto, Fumiaki Ito, Kazuki Takahashi, Fumihiko Takasaki, Kohei Hayashi, H. Fujii, Kazuyuki Sato, Kanetada Nagamine, Satoshi Tanaka, A. Suzuki, Kotaro Satoh, Hideyo Kodama, Yu Takahashi, and Satoru Yamashita

Subjects
Storage pool, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Nuclear engineering, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, complex mixtures, High Energy Physics - Experiment, law.invention, Physics::Geophysics, High Energy Physics - Experiment (hep-ex), law, 0103 physical sciences, Physics::Chemical Physics, 010306 general physics, Physics, COSMIC cancer database, Nuclear fuel, 010308 nuclear & particles physics, Muon radiography, technology, industry, and agriculture, Instrumentation and Detectors (physics.ins-det), Nuclear reactor, equipment and supplies, Pressure vessel, High Energy Physics::Experiment, Cosmic muons, Muon detector
Abstract

We studied the inner structure of the nuclear reactor of the Japan Atomic Power Company (JAPC) at Tokai, Japan, by the muon radiography. In this study, muon detectors were placed outside of the reactor building. By detecting cosmic muons penetrating through the wall of the reactor building, we could successfully identify the objects such as the containment vessel, pressure vessel, and other structures of the reactor. We also observed a concentration of heavy material which can be attributed to the nuclear fuel assemblies stored in the nuclear fuel storage pool., Comment: 15 pages, 22 figures, accepted for publication in PTEP

Published
2019

22. Numerical analysis and experiment to identify origin of buckling in rapid cycling synchrotron core

Author

Yoshiyuki Morita, Nobuhiro Yoshikawa, M. Tsukamoto, M. Akoshima, Satoru Yamashita, Tatsuya Kageyama, and S. Torizuka

Subjects
Physics, Nuclear and High Energy Physics, Particle accelerator, Epoxy, Synchrotron, Stiffening, law.invention, Core (optical fiber), Compressive strength, Buckling, law, visual_art, visual_art.visual_art_medium, Magnetic alloy, Composite material, Instrumentation
Abstract

The accelerating cavities used in the rapid cycling synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) are loaded with magnetic alloy (MA) cores. Over lengthly periods of RCS operation, significant reductions in the impedance of the cavities resulting from the buckling of the cores were observed. A series of thermal structural simulations and compressive strength tests showed that the buckling can be attributed to the low-viscosity epoxy resin impregnation of the MA core that causes the stiffening of the originally flexible MA–ribbon–wound core. Our results showed that thermal stress can be effectively reduced upon using a core that is not epoxy-impregnated.

Published
2013

23. A high S/N ratio spin flip chopper system for a pulsed neutron source

Author

Hideyuki Oide, Suguru Muto, Hidetoshi Otono, T. Ebisawa, Masahiro Hino, Kenji Mishima, Takayuki Oku, Tatsushi Shima, Takashi Ino, Tamaki Yoshioka, Katsuya Hirota, Kaoru Taketani, Masaaki Kitaguchi, Kenji Sakai, Hirohiko M. Shimizu, and Satoru Yamashita

Subjects
Physics, Nuclear and High Energy Physics, Aperture, Particle accelerator, law.invention, Chopper, Nuclear physics, Beamline, law, Physics::Accelerator Physics, Neutron source, Neutron, Spin-flip, Radio frequency, Instrumentation
Abstract

We report a successful demonstration of a high S/N ratio spin flip chopper (SFC) system for pulsed neutron sources. The system consists of two SFCs and each SFC consists of a radio frequency (RF) flipper and Soller magnetic supermirrors. The aperture of the Soller mirror was 18 mm in width and 20 mm in height. The S/N ratio of the system was 306:1. This system is going to be installed to measure neutron lifetime precisely using the cold-neutron beam line, BL05 polarized-beam branch, at the Materials and Life Science Experimental Facility (MLF) in Japan Proton Accelerator Research Complex (J-PARC).

Published
2011

24. Polarization of very cold neutron using a permanent magnet quadrupole

Author

Sachio Komamiya, Hirohiko M. Shimizu, S. Kawasaki, Kenji Mishima, Masaaki Kitaguchi, P. Geltenbort, Katsuya Hirota, Suguru Muto, Takahiro Morishima, Yoshihisa Iwashita, Masahiro Hino, Masahiro Ichikawa, Yoshie Otake, Takashi Ino, Hidetoshi Otono, Hiromi Sato, Takenao Shinohara, Masako Yamada, Yoshichika Seki, Yoshio Kamiya, Kaoru Taketani, Tamaki Yoshioka, Takayuki Oku, Jun-ichi Suzuki, Kenji Sakai, Satoru Yamashita, and Takanori Sugimoto

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Magnet, Nuclear Theory, Fundamental physics, Quadrupole, Neutron, Nuclear Experiment, Polarization (waves), Quadrupole magnet, Instrumentation
Abstract

For the future fundamental physics experiments by using cold neutrons, we are developing a device which can measure the neutron polarization degree by accuracy significantly below 10 −3 . A quadrupole magnet is one of the promising candidate to measure the neutron polarization degree by such extremely high precision. We have performed a polarization experiment by using the quadrupole magnets at the Very Cold Neutron (VCN) port of the PF-2 in the Institute Laue-Langevin (ILL). As a result, we obtained the polarization degree P with very high accuracy P =0.9994±0.0001( stat. )±0.0003( syst. ), which meet our requirement significantly.

Published
2011

25. Longitudinal-gradient magnet for time focusing of ultra-cold neutrons

Author

S. Imajo, Akihiro Yoshimi, Hirohiko M. Shimizu, Takashi Ino, Yoshihisa Iwashita, Satoru Yamashita, Kaoru Taketani, Koichiro Asahi, Tamaki Yoshioka, Kenji Sakai, Suguru Muto, Tatsushi Shima, Masaaki Kitaguchi, Yoshio Kamiya, Yasushi Arimoto, and Kenji Mishima

Subjects
Physics, Pole piece, anisotropic inter-pole, Field (physics), Electropermanent magnet, Magnetic moment, business.industry, General Medicine, Physics and Astronomy(all), Tracking (particle physics), magnet, Magnetic field, neutron EDM, Optics, Dipole magnet, Magnet, business, ultra-cold neutron
Abstract

A gradient DC magnet is designed using 3D magnetic field analysis code. This magnet, referred to as a B0 magnet, is one of the key elements of a time-focusing device for ultra-cold neutrons (UCNs) based on a radio frequency gradient flipper – a so-called rebuncher. The magnet generates a guide and a potential field that interacts with the magnetic moment of UCNs and its main body comprises a C-shaped yoke made from iron. A field gradient is generated by a pole arrangement that includes an anisotropic inter-pole, which causes the fringe field to be uniform in the longitudinal direction even when the pole gap distance changes. The designed magnet has the following properties: (1) a maximum B-field of 10 kGauss, decreasing to 2 kGauss at a longitudinal distance of 25 cm, with a gradient of less than 400 Gauss/cm, (2) variations in the fringe field along the y direction is less than 4% over a range of − 3 cm≤ y ≤ 3 cm at any z position in the spin-flipping region. Tracking simulations show that the B0 magnet is capable of accepting UCNs in the velocity range 2.3∼3.3 m/s.

Published
2011
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26. Search for invisibly decaying Higgs bosons in e+e−→Z0h0 production at s=183–209 GeV

Author

A. J. Martin, M. Ford, M. Boutemeur, F. S. Merritt, D. E. Plane, P. Scharff-Hansen, J. von Krogh, W. Mader, R. J. Hawkings, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, Ehud Duchovni, A. M. Smith, J. A. McKenna, Kiyotomo Kawagoe, Daniel Lellouch, Tara Shears, A. Michelini, J. Dubbert, Robert Vertesi, R. K. Carnegie, J. A. Wilson, Takehiko Mori, M. Schumacher, Gideon Bella, Andris Skuja, Robert McPherson, T. Kobayashi, M. Przybycień, A. Ludwig, A. D. Schaile, Gabriella Pasztor, D. Axen, A. A. Carter, Richard Teuscher, Oana Elena Vickey Boeriu, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, P. J. Bell, H. J. Burckhart, R. M. Brown, T. R. Junk, Tetsuro Mashimo, M. F. Turner-Watson, P. Vannerem, Fabrizio Fabbri, A. Frey, E. A. De Wolf, F. Spano, P. S. Wells, Lorne Levinson, Peter Sherwood, Terry Richard Wyatt, A. T. Watson, J. Lillich, Matthias Schröder, B. W. Kennedy, C. P. Ward, G. W. Wilson, I. R. Bailey, P. Jovanovic, Christoph Geich-Gimbel, J. Ludwig, M. Hauschild, M. Hamann, N. Meyer, Klaus Rabbertz, L. Zivkovic, K. Runge, P. Bock, Peter Krieger, J. M. Roney, S. Söldner-Rembold, S. W. O'Neale, W. Menges, Otmar Biebel, M. Kupper, H. Nanjo, R. J. Sobie, Stephen Lloyd, Joost Vossebeld, Oliver Pooth, Klaus Desch, T. Schörner-Sadenius, Koichi Nagai, C. F. Vollmer, Attila Krasznahorkay, E. Torrence, A. Gupta, Yoram Rozen, W. Mohr, H. Mes, I. P. Duerdoth, Shlomo Dado, Jochen Schieck, K. J. Anderson, Thorsten Wengler, T. Behnke, D. J. Miller, G. Mikenberg, Norbert Wermes, Junichi Kanzaki, James Pinfold, A. Quadt, R. Seuster, M. A. Thomson, Marco Cuffiani, Gideon Alexander, Paolo Capiluppi, T. Kawamoto, E. K. U. Gross, R. J. Batley, Dave Charlton, H. Voss, R. J. Barlow, S. Orito, H. Landsman, C. Y. Chang, Teresa Barillari, Satoru Yamashita, Gabriele Benelli, P. Gagnon, A. Csilling, R. D. Heuer, M. J. Oreglia, E. L. Barberio, S. Braibant, E. Tsur, C. M. Hawkes, Zoltan Laszlo Trocsanyi, Isabel Marian Trigger, K. W. Bell, P. Mättig, Shoji Asai, Gregor Herten, J. C. Hill, Balazs Ujvari, Tobias Kramer, J. E. Pilcher, B. C. Shen, Siegfried Bethke, I. Nakamura, J. W. Gary, Raimund Ströhmer, Marek Tasevsky, Dezso Horvath, R. G. Kellogg, Beatrix Dienes, Alexander Oh, D. Lanske, Csaba Hajdu, J. Goldberg, Stefano Marcellini, Christoph Rembser, Gunter Wolf, James Letts, D. Karlen, D. Zer-Zion, F. K. Loebinger, Erez Etzion, Ivor Fleck, Stefan Kluth, Shlomit Tarem, Joleen Pater, M. Giunta, Edward K. G. Sarkisyan, D. Toya, H. A. Neal, Sachio Komamiya, M. Gruwe, T. Saeki, A. Mutter, J. Grunhaus, Gordon H. Hanson, G. Giacomelli, A. De Roeck, M. Kobel, Frans Meijers, Alain Bellerive, P. Igo-Kemenes, K. Ishii, H. Jeremie, G. Anagnostou, O. Schaile, T. Kuhl, Pamela Ferrari, Paolo Giacomelli, Claudia Ciocca, K. Sachs, J. R. Carter, Philip Bechtle, N. K. Watson, Achim Stahl, C. Ainsley, C. Pahl, A. M. Rossi, G. D. Lafferty, R. K. Keeler, P. M. Watkins, P. Renkel, S. Campana, Guenter Duckeck, Satoshi Mihara, Frank Fiedler, and D. R. Ward

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Elementary particle, 01 natural sciences, Standard Model, Vector boson, Nuclear physics, 0103 physical sciences, Neutralino, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Minimal Supersymmetric Standard Model, Boson
Abstract

A search is performed for Higgs bosons decaying into invisible final states, produced in association with a Z(0) boson in e(+)e(-) collisions at energies between 183 and 209 GeV. The search is based on data samples collected by the OPAL detector at LEP corresponding to an integrated luminosity of about 660 pb(-1). The analysis aims to select events containing the hadronic decay products of the Z(0) boson and large missing momentum, as expected from Higgs boson decay into a pair of stable weakly interacting neutral particles, such as the lightest neutralino in the Minimal Supersymmetric Standard Model. The same analysis is applied to a search for nearly invisible Higgs boson cascade decays into stable weakly interacting neutral particles. No excess over the expected background from Standard Model processes is observed. Limits on the production of invisibly decaying Higgs bosons produced in association with a Z(0) boson are derived. Assuming a branching ratio BR(h(0) -> invisible) = 1, a lower limit of 108.2 GeV is placed on the Higgs boson mass at the 95% confidence level. Limits on the production of nearly invisibly decaying Higgs bosons are also obtained. (C) 2009 Elsevier B.V. All rights reserved.

Published
2010

27. Syntheses and Characterization of Novel trans ‐Bis(phosphoranido)platinum(II) Complexes: Reactions of Lithium Bis(naphth‐1,8‐diyl‐8‐oxy)phosphoranide with cis ‐PtCl 2 (PR 3 ) 2 (R = OPh, OMe, Me)

Author

Issei Sato, Takeshi K. Miyamoto, Satoru Yamashita, and Kazumasa Kajiyama

Subjects
Inorganic Chemistry, chemistry.chemical_compound, Stereospecificity, chemistry, Stereochemistry, chemistry.chemical_element, Lithium, Platinum, Medicinal chemistry, Phosphorane
Abstract

The reactions of cis-PtCl2(PR3)2 (R = OPh, OMe) with 1 equiv. of lithium phosphoranide generated from a bis(naphth-1,8-diyl-8-oxy)phosphorane lead to the formation of cis-monophosphoranido complexes with high stereospecificity. The reaction of cis-PtCl2(PMe3)2 with 1 equiv. of the lithium phosphoranide afforded a trans-monophosphoranido complex, exclusively. Hitherto unknown trans-bis(phosphoranido)platinum(II) complexes were obtained as major products in the reactions of cis-PtCl2(PR3)2 (R = OPh, OMe, Me) with an excess of the lithium phosphoranide. The stereochemistry was confirmed by X-ray structural analysis of the bis(phosphoranido) complex bearing triphenyl phosphites. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

Published
2009

28. Development of modulating permanent magnet sextupole lens for focusing of pulsed cold neutrons

Author

Sachio Komamiya, Yoshihisa Iwashita, Yoshichika Seki, Suguru Muto, Hiroshi Fujisawa, Yoshio Kamiya, Takanori Sugimoto, Peter Geltenbort, Takashi Ino, Hirohiko M. Shimizu, Katsuya Hirota, Hidetoshi Otono, Kenji Mishima, Hiromi Sato, Hiromu Tongu, Takahiro Morishima, M. Ichikawa, Takenao Shinohara, S. Kawasaki, Yoshie Otake, Masako Yamada, Takayuki Oku, Kaoru Taketani, Kenji Sakai, Tamaki Yoshioka, Jun-ichi Suzuki, and Satoru Yamashita

Subjects
Physics, business.industry, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, law.invention, Lens (optics), Time of flight, Optics, Modulation, law, Magnet, Chromatic aberration, Focal length, Neutron, Electrical and Electronic Engineering, business
Abstract

Modulating permanent magnet sextupole lens (PMSx) for focusing pulsed cold neutrons is under development. The synchronized modulation of its field gradient suppresses the chromatic aberration which arises from the Time Of Flight method. The strength of the magnetic field, the torque, and the rise of temperature during its operation are studied on a fabricated prototype. Experiments on focusing pulsed very cold neutrons (VCN) at ILL (Institute of Laue Langevin, France) were carried out and VCN with around λ =40 A were focused by the PMSx at a focal length of about 0.5 m. The experimental results are presented in conjunction with the principle of the neutron focusing and the modulating method of the focal strength of permanent magnet lens with the double ring structure.

Published
2009

29. Search for Dirac magnetic monopoles in e+e− collisions with the OPAL detector at LEP2

Author

M. Ford, P. Igo-Kemenes, W. Menges, Otmar Biebel, Achim Stahl, J. von Krogh, K. Ishii, H. Jeremie, Kiyotomo Kawagoe, Yoram Rozen, David J. Miller, M. Boutemeur, F. S. Merritt, S. Campana, Sachio Komamiya, R. J. Hawkings, B. C. Shen, H. Landsman, M. Gruwe, O. Schaile, Norbert Wermes, J. A. McKenna, T. Kawamoto, Oliver Pooth, D. Zer-Zion, F. K. Loebinger, Junichi Kanzaki, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, H. A. Neal, Andris Skuja, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, T. Kuhl, Siegfried Bethke, Alain Bellerive, S. W. O'Neale, Gordon H. Hanson, Gideon Bella, S. Orito, Daniel Lellouch, H. Mes, E. L. Barberio, Paolo Giacomelli, Takehiko Mori, T. Saeki, H. J. Burckhart, Christoph Geich-Gimbel, I. Nakamura, I. P. Duerdoth, Gideon Alexander, A. D. Schaile, D. Axen, J. Dubbert, Robert Vertesi, R. K. Carnegie, A. J. Martin, Paolo Capiluppi, Tetsuro Mashimo, M. F. Turner-Watson, J. W. Gary, Oana Elena Vickey Boeriu, Gabriella Pasztor, P. Vannerem, J. A. Wilson, A. Krasznahorkay, F. Spano, G. Mikenberg, Guenter Duckeck, K. J. Anderson, Peter Sherwood, Lorne Levinson, D. R. Ward, Thorsten Wengler, Raimund Ströhmer, J. Lillich, Richard Teuscher, N. Meyer, P. Mättig, Teresa Barillari, B. W. Kennedy, I. R. Bailey, Marek Tasevsky, A. Csilling, M. J. Oreglia, J. Letts, J. Ludwig, K. Runge, P. Jovanovic, R. J. Batley, M. Kupper, P. Bock, T. R. Wyatt, S. Braibant, C. P. Ward, N. K. Watson, C. Pahl, Dezso Horvath, J. Grunhaus, Gunter Wolf, Peter Krieger, D. E. Plane, Shoji Asai, W. Mader, M. Schumacher, S. Söldner-Rembold, M. Przybycień, Klaus Rabbertz, T. R. Junk, A. A. Carter, G. M. Dallavalle, D. Karlen, J. M. Roney, E. A. De Wolf, Stephen Lloyd, C. Ainsley, P. S. Wells, Tara Shears, M. Verzocchi, G. Giacomelli, A. M. Rossi, P. F. Åkesson, Giovanni Abbiendi, A. T. Watson, P. Scharff-Hansen, L. Zivkovic, Dave Charlton, P. Gagnon, A. De Roeck, M. Kobel, Gabriele Benelli, Koichi Nagai, Shlomo Dado, W. Mohr, A. Mutter, Ehud Duchovni, Robert McPherson, R. M. Brown, P. M. Watkins, Zoltan Laszlo Trocsanyi, Frans Meijers, A. Harel, Fabrizio Fabbri, A. Frey, George Lafferty, A. M. Smith, Satoshi Mihara, A. Michelini, Ikuo Ueda, D. M. Strom, E. Torrence, A. Gupta, P. Renkel, R. D. Heuer, T. Kobayashi, J. Lu, M. Cozzi, Gregor Herten, A. Ludwig, John Hill, James Pinfold, A. Quadt, R. Seuster, Claudia Ciocca, Beatrix Dienes, K. Sachs, J. R. Carter, J. Goldberg, Philip Bechtle, Frank Fiedler, M. Hamann, G. Anagnostou, Balazs Ujvari, J. E. Pilcher, Richard Keeler, Pamela Ferrari, G. W. Wilson, R. J. Sobie, M. Hauschild, C. Y. Chang, Joost Vossebeld, M. A. Thomson, E. K. U. Gross, H. Voss, Klaus Desch, Satoru Yamashita, Matthias Schröder, E. Tsur, C. M. Hawkes, Christoph Rembser, T. Behnke, Isabel Marian Trigger, K. W. Bell, Erez Etzion, T. Schörner-Sadenius, Stefan Kluth, Shlomit Tarem, Tobias Kramer, M. Giunta, P. J. Bell, M. Cuffiani, H. Nanjo, C. F. Vollmer, Jochen Schieck, R. J. Barlow, Alexander Oh, and D. Lanske

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Dirac (video compression format), Electron–positron annihilation, Magnetic monopole, Tracking (particle physics), 01 natural sciences, Charged particle, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Ionization energy, 010306 general physics, Event generator
Abstract

This Letter describes a direct search for pair produced magnetic monopoles in e(+)e(-) collisions. The analysis is based on 62.7 pb(-1) of data collected with the OPAL detector at an average centre-of-mass energy of root S = 206.3 GeV. The monopole signal was assumed to be characterized by two back-to-back particles with an anomalously high ionization energy loss dE/dx in the tracking chambers. No evidence for production of monopoles was observed. Upper limits were obtained on the magnetic monopole pair-production cross-section (sigma) in the mass range 45 GeV/c(2) < m(M) < 102 GeV/c(2). The average limit is sigma < 0.05 pb and is essentially independent of the magnetic monopole mass. The cross-section limit is derived at the 95% confidence level and is valid for spin-1/2 magnetic monopoles. (C) 2008 Published by Elsevier B.V.

Published
2008

30. Inclusive jet production in photon–photon collisions at see from 189 to 209 GeV

Author

George Lafferty, Erez Etzion, Satoshi Mihara, Thorsten Wengler, Stefan Kluth, Shlomit Tarem, Klaus Rabbertz, Frank Fiedler, Dave Charlton, M. Ford, Stephen Lloyd, A. Harel, J. Lillich, Kiyotomo Kawagoe, Ikuo Ueda, D. M. Strom, S. Campana, B. W. Kennedy, M. Giunta, P. Jovanovic, C. Y. Chang, J. Lu, Peter Krieger, D. R. Ward, J. von Krogh, M. Schumacher, P. J. Bell, Shlomo Dado, Ehud Duchovni, D. Zer-Zion, D. E. Plane, Christoph Geich-Gimbel, R. D. Heuer, Gabriele Benelli, F. K. Loebinger, A. Michelini, P. Scharff-Hansen, R. J. Hawkings, T. Schörner-Sadenius, E. A. De Wolf, Gideon Bella, Ivor Fleck, E. Tsur, Gunter Wolf, Joleen Pater, Sachio Komamiya, C. M. Hawkes, H. J. Burckhart, Edward K. G. Sarkisyan, D. Toya, T. Kobayashi, A. Ludwig, Isabel Marian Trigger, K. W. Bell, D. Karlen, H. A. Neal, L. Zivkovic, Pamela Ferrari, H. Nanjo, A. M. Smith, D. J. Miller, A. D. Schaile, Gabriella Pasztor, P. Igo-Kemenes, M. Przybycień, P. Vannerem, J. C. Hill, Tara Shears, Gregor Herten, Richard Teuscher, Tobias Kramer, B. C. Shen, T. R. Junk, A. A. Carter, K. Ishii, H. Jeremie, C. P. Ward, M. Gruwe, Andris Skuja, S. W. O'Neale, E. Torrence, A. Gupta, Siegfried Bethke, H. Mes, P. S. Wells, A. Csilling, S. Söldner-Rembold, Oliver Pooth, C. F. Vollmer, M. Boutemeur, F. S. Merritt, Jochen Schieck, J. M. Roney, Gideon Alexander, Tetsuro Mashimo, M. F. Turner-Watson, Balazs Ujvari, J. Goldberg, J. E. Pilcher, R. K. Keeler, N. K. Watson, Koichi Nagai, H. Landsman, T. R. Wyatt, I. P. Duerdoth, K. J. Anderson, A. T. Watson, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, I. Nakamura, J. W. Gary, W. Mohr, O. Schaile, N. Meyer, R. J. Barlow, Paolo Capiluppi, Paolo Giacomelli, M. Kupper, M. Hamann, Raimund Ströhmer, G. Mikenberg, G. W. Wilson, M. Hauschild, T. Behnke, P. Mättig, Marek Tasevsky, P. M. Watkins, T. Kuhl, E. L. Barberio, J. A. McKenna, Dezso Horvath, M. A. Thomson, J. Dubbert, Robert Vertesi, R. K. Carnegie, Robert McPherson, R. M. Brown, Lorne Levinson, Christoph Rembser, E. K. U. Gross, H. Voss, Daniel Lellouch, Marco Cuffiani, Takehiko Mori, P. Renkel, R. J. Batley, R. J. Sobie, J. A. Wilson, I. R. Bailey, R. G. Kellogg, Satoru Yamashita, James Pinfold, Joost Vossebeld, A. Quadt, R. Seuster, C. Ainsley, Fabrizio Fabbri, Klaus Desch, A. Frey, Guenter Duckeck, A. M. Rossi, A. J. Martin, Csaba Hajdu, Stefano Marcellini, Alain Bellerive, A. Krasznahorkay, W. Mader, J. Letts, C. Pahl, T. Saeki, Alexander Oh, G. Anagnostou, D. Lanske, Gordon H. Hanson, Claudia Ciocca, Achim Stahl, K. Sachs, J. R. Carter, Philip Bechtle, G. Giacomelli, A. Mutter, A. De Roeck, M. Kobel, Frans Meijers, Yoram Rozen, J. Grunhaus, Junichi Kanzaki, Teresa Barillari, B. Dienes, Shoji Asai, D. Axen, Oana Elena Vickey Boeriu, F. Spano, Peter Sherwood, J. Ludwig, K. Runge, P. Bock, P. Gagnon, Zoltan Laszlo Trocsanyi, W. Menges, Otmar Biebel, Norbert Wermes, T. Kawamoto, S. Orito, M. J. Oreglia, S. Braibant, and Matthias Schröder

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Jet (fluid), Photon, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Perturbative QCD, 01 natural sciences, Nuclear physics, Pair production, 0103 physical sciences, Strong coupling, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Event generator
Abstract

Inclusive jet production (e(+)e(-) -> e(+)e(-) + jet + X) is studied in collisions of quasi-real photons radiated by the LEP beams at e(+)e(-) centre-of-mass energies root s(ee) from 189 to 209 GeV. Jets are reconstructed using the k(perpendicular to) jet algorithm. The inclusive differential cross-section is measured as a function of the jet transverse momentum, p(T)(jet), in the range 5 < p(T)(jet) < 40 GeV for pseudo-rapidities, eta(jet), in the range - 1.5 < eta(jet) < 1.5. The results are compared to predictions of perturbative QCD in next-to-leading order in the strong coupling constant. (c) 2007 Elsevier B.V. All rights reserved.

Published
2008

31. Development of Microwave-Excited Plasma-Enhanced Metal–Organic Chemical Vapor Deposition System for Forming Ferroelectric Sr2(Ta1-x,Nbx)2O7Thin Film on Amorphous SiO2

Author

Tadahiro Ohmi, Satoru Yamashita, Ichirou Takahashi, Shigetoshi Sugawa, Akinobu Teramoto, Keita Azumi, Kiyoshi Funaiwa, Masaki Hirayama, and Yasuyuki Shirai

Subjects
Materials science, Physics and Astronomy (miscellaneous), business.industry, General Engineering, General Physics and Astronomy, Dielectric, Chemical vapor deposition, Sputter deposition, Ferroelectricity, law.invention, Amorphous solid, law, Optoelectronics, Metalorganic vapour phase epitaxy, Crystallization, Thin film, business
Abstract

Sr2(Ta1-x,Nbx)2O7 (STN; x = 0.3) is suitable for use as ferroelectric gate field-effect transistors (FETs) for one-transistor-type ferroelectric memory devices, because it has a low dielectric constant. For applications using metal–ferroelectric–insulator–semiconductor (MFIS) FETs, crystallization of ferroelectric film on insulator is necessary. Perovskite STN can be successfully obtained on amorphous SiO2 by ferroelectric-multilayer-stack (FMLS) deposition, which uses alternating steps of STN sputtering deposition and oxygen radical treatment. In this study, we report on a newly developed microwave-excited plasma-enhanced metal–organic chemical vapor deposition (MOCVD) system, in which STN can be deposited in radical oxygen atmosphere. We succeeded in the fabrication of STN on amorphous SiO2 in a single process. The IrO2/STN (200 nm)/SiO2 (10 nm)/p-type Si device shows capacitance–voltage (C–V) hysteresis curves and a memory window of 1.2 V with a 5 V writing operation.

Published
2007

32. Simulation Study for Systematic Uncertainty Suppression in nEDM Experiment Assuming Various Surfaces Roughness

Author

Kenji Mishima, Tamaki Yoshioka, Masaaki Kitaguchi, Satoru Yamashita, Masakazu Kurata, Dai Sakurai, Ryo Katayama, and Yoshichika Seki

Subjects
Systematic error, Meteorology, Econometrics
Abstract

Ryo Katayama1, Kenji Mishima2,3, Masaaki Kitaguchi4, Masakazu Kurata2, Dai Sakurai5, Yoshichika Seki6, Satoru Yamashita2, Tamaki Yoshioka7 1School of Science, The University of Tokyo, Tokyo, 113-0033, Japan 2ICEPP, The University of Tokyo, Tokyo, 113-0033, Japan 3KEK, Tokai, Ibaraki, 319-1118, Japan 4KMI, Nagoya University, Nagoya, 464-8602, Japan 5Department of Physics, Tokyo University of Science, Noda, Chiba, 278-8510, Japan 6RIKEN, Wako, Saitama, 351-0198, Japan 7RCAPP, Kyushu University, Fukuoka, 812-8581, Japan

Published
2015

33. The Degradation Prevention of Resin Materials for Semiconductor Manufacturing Equipment by Applying the Ultra-High Purity Gas Supply Technology

Author

Hidekazu Ishii, Satoru Yamashita, Masafumi Kitano, Naoki Tanahashi, Yasuyuki Shirai, Atsushi Hidaka, and Tadahiro Ohmi

Subjects
Materials science, Passivation, Semiconductor device fabrication, business.industry, Metallurgy, technology, industry, and agriculture, chemistry.chemical_element, Molding (process), Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Nickel, Semiconductor, stomatognathic system, chemistry, Degradation (geology), General Materials Science, Limiting oxygen concentration, Fluorocarbon, Composite material, business
Abstract

The production (molding) guideline to realize ultraclean resin components for semiconductor equipment has been established. In this paper, we focused on the degradation behavior of resin materials for the purpose of reducing low-molecular-weight volatile contaminants concentration in resin components because the molding is carried out at high temperature and low-molecular-weight volatile contaminants are produced by thermal degradation. It was clarified that the oxygen concentration in high temperature molding environment is required to be below 1 ppm. And as the contact surface of the thermal degradation prevention for the resin material, the following surface materials are effective. 1) Passivation surface for a hydrocarbon resin. 2) Ni (nickel) surface for a fluorocarbon resin. As a result, we found the degradation prevention of the resin material can be realized until around 400°C although the degradation was observed even under 200 °C if using current process condition. Therefore, low-molecular-weight volatile contaminants can be drastically reduced from resin components by using the guideline and ultraclean semiconductor equipment must be realized.

Published
2005

35. The Development of a Superconducting RF Electron Microscope

Author

Kenji Ueno, Shinichiro Michizono, Masahiro Yamamoto, Satoru Yamashita, Michiru Nishiwaki, Motoaki Sawabe, Yukihide Kamiya, Atsushi Enomoto, Y. Funahashi, Takaaki Furuya, Nao Higashi, Hiroshi Sakai, and Masao Kuriki

Subjects
Superconductivity, Materials science, law, business.industry, Optoelectronics, Electron microscope, business, law.invention
Published
2014

36. Study on Material Removal Process in Electrolytic Grinding

Author

Naoto Fujii, Toshikatsu Nakajima, Satoru Yamashita, Shinichi Ueda, and Kazuhito Ohashi

Subjects
Materials science, Mechanical Engineering, Scientific method, Metallurgy, Material removal, Electrolyte, Grinding
Published
2001

37. Determination of trace amounts of off-flavor compounds in drinking water by stir bar sorptive extraction and thermal desorption GC-MS

Author

Andreas Hoffman, Satoru Yamashita, Nobuo Ochiai, Masahiko Takino, Kikuo Sasamoto, Arnd C. Heiden, and Shigeki Daishima

Subjects
Detection limit, Chromatography, Trace Amounts, Chemistry, Extraction (chemistry), Analytical chemistry, Thermal desorption, Reproducibility of Results, Biochemistry, Gas Chromatography-Mass Spectrometry, Analytical Chemistry, Tap water, Water Supply, Taste, Electrochemistry, Humans, Environmental Chemistry, Selected ion monitoring, Gas chromatography, Gas chromatography–mass spectrometry, Water Pollutants, Chemical, Spectroscopy
Abstract

A method for the determination of trace amounts of off-flavor compounds including 2-methylisoborneol, geosmin and 2,4,6-trichloroanisole in drinking water was developed using the stir bar sorptive extraction technique followed by thermal desorption-GC-MS analysis. The extraction conditions such as extraction mode, salt addition, extraction temperature, sample volume and extraction time were examined. Water samples (20, 40 and 60 ml) were extracted for 60-240 min at room temperature (25 degrees C) using stir bars with a length of 10 mm and coated with a 500 microm layer of polydimethylsiloxane. The extract was analyzed by thermal desorption-GC-MS in the selected ion monitoring mode. The method showed good linearity over the concentration range from 0.1 or 0.2 or 0.5 to 100 ng l(-1) for all the target analytes, and the correlation coefficients were greater than 0.9987. The detection limits ranged from 0.022 to 0.16 ng l(-1). The recoveries (89-109%) and precision (RSD: 0.80-3.7%) of the method were examined by analyzing raw water and tap water samples fortified at the 1 ng l(-1) level. The method was successfully applied to low-level samples (raw water and tap water).

Published
2001

38. On the basic mechanism of Pixelized Photon Detectors

Author

Hideyuki Oide, Tamaki Yoshioka, Satoru Yamashita, and Hidetoshi Otono

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, business.industry, Process (computing), FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Semiconductor device, Dead time, Photon counting, Optics, Silicon photomultiplier, Waveform, Multiplication, Deconvolution, business, Instrumentation
Abstract

A Pixelized Photon Detector (PPD) is a generic name for the semiconductor devices operated in the Geiger-mode, such as Silicon PhotoMultiplier and Multi-Pixel Photon Counter, which has high photon counting capability. While the internal mechanisms of the PPD have been intensively studied in recent years, the existing models do not include the avalanche process. We have simulated the multiplication and quenching of the avalanche process and have succeeded in reproducing the output waveform of the PPD. Furthermore our model predicts the existence of dead-time in the PPD which has never been numerically predicted. For serching the dead-time, we also have developed waveform analysis method using deconvolution which has the potential to distinguish neibouring pulses precisely. In this paper, we discuss our improved model and waveform analysis method., Comment: 4pages, 5figures, To appear in the proceedings of 5th International Conference on New Developments in Photodetection (NDIP08), Aix-les-Bains, France, 15-20 Jun 2008

Published
2009

39. Highly polarized very cold neutrons through a permanent magnet quadrupole

Author

Tamaki Yoshioka, Masaaki Kitaguchi, Suguru Muto, Jun-ichi Suzuki, Takanori Sugimoto, Hidetoshi Otono, Hiromi Sato, Takayuki Oku, Hirohiko M. Shimizu, Satoru Yamashita, P. Geltenbort, Yoshihisa Iwashita, Kenji Sakai, Kenji Mishima, Sachio Komamiya, Masako Yamada, Takahiro Morishima, Yoshichika Seki, Yoshio Kamiya, S. Kawasaki, Masahiro Hino, Takashi Ino, Kaoru Taketani, Katsuya Hirota, Yoshie Otake, M. Ichikawa, and Takenao Shinohara

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Neutron polarizer, Polarizer, Condensed Matter Physics, Polarization (waves), Quadrupole magnet, Electronic, Optical and Magnetic Materials, law.invention, Nuclear physics, law, Dipole magnet, Magnet, Quadrupole, Ultracold neutrons, Physics::Accelerator Physics, Neutron, Polarized neutron, Physics::Atomic Physics, Electrical and Electronic Engineering, Nuclear Experiment
Abstract

We obtained highly polarized very cold neutrons through a quadrupole magnet with a large aperture. When neutrons go through a quadrupole magnet, parallel-spin neutrons are attracted to the magnet axis and anti-parallel-spin neutrons are repelled off the axis. Therefore, the neutrons through a sufficiently long quadrupole magnet have completely parallel-spin. At the downstream of the quadrupole magnet, we placed another quadrupole magnet to divide neutrons into two regions depending on their spin directions. We obtained the neutron polarization from the integrated count of the two regions and found it was 99.88±0.09 (stat.)±0.05 (syst.)%.

Published
2009

40. Distribution of trigeminal fibers in the primary facial gustatory center of channel catfish, Ictalurus punctatus

Author

Sadao Kiyohara, Charles F. Lamb, Satoru Yamashita, and Thomas E. Finger

Subjects
Nerve fiber, Sensory system, Biology, Trigeminal Nuclei, Nerve Fibers, medicine, Animals, Trigeminal Nerve, Molecular Biology, Medulla, Trigeminal nerve, Medulla Oblongata, General Neuroscience, Anatomy, Spinal cord, Facial nerve, Axons, Ictaluridae, Facial Nerve, Trigeminal motor nucleus, medicine.anatomical_structure, Spinal Cord, Taste, Neurology (clinical), Trigeminal Nucleus, Spinal, Developmental Biology, Catfish
Abstract

Previous studies in several fishes including catfish, have shown that primary trigeminal nerve (NV) axons terminate not only in the principal and spinal trigeminal nuclei, but in the facial (gustatory) lobes. The present study was undertaken to determine the extent and distribution of trigeminal terminations within the facial lobe (FL) and principal trigeminal nucleus (nVpr) in the channel catfish, Ictalurus punctatus. In order to reveal the distribution of trigeminal fibers, the carbocyanine dye, diI, was applied to the central cut stump of the trigeminal root in isolated, paraformaldehyde-fixed brains. After a diffusion period of 10-90 days, the brains were serially sectioned on a vibratome and examined with epifluorescence. The trigeminal motor nucleus (nVm) and principal sensory nucleus lie near the level of entrance of NV. The majority of primary trigeminal fibers, however, sweep caudally after entering into the brain to form the descending root. At the level of the caudal third of the FL, collaterals emitted by the descending root fibers turn medially and dorsally to terminate in the FL. The trigeminal fibers are coarser than the facial nerve (NVII) fibers which terminate within the same structure. The trigeminal fibers terminate throughout the FL except for the lateral-most lobule which contains the representation of taste buds innervated by the recurrent branch of NVII, i.e., those over the trunk and tail of the animal. These results show that in catfish, the trigeminal input to the primary gustatory complex is restricted to those portions of the nucleus receiving chemosensory inputs from the face and barbels, i.e., the trigeminally innervated sensory fields.

Published
1999

41. An upper limit for the $\tau$ –neutrino mass from $\tau\rightarrow 5\pi^{\pm}\nu_{\tau}$ decays

Author

R. Bartoldus, H. M. Fischer, H. O. Ogren, Christoph Geich-Gimbel, P. G. Bright-Thomas, N. Altekamp, H. Voss, Gideon Bella, M. Schumacher, E. Lefebvre, S. B. Anderson, D. J. Miller, Vakhtang Kartvelishvili, S. L. Lloyd, F. Odorici, Otmar Biebel, P. I. Kayal, A. J. Martin, Norbert Wermes, Sherry Towers, T. Kawamoto, J. E. Conboy, A. Fürtjes, S. Orito, H. A. Neal, B. C. Shen, S. W. O'Neale, H. J. Burckhart, Jacqueline Batley, Stan Bentvelsen, J. A. McKenna, Daniel Lellouch, Takehiko Mori, J. Grunhaus, P. Gagnon, J. Allison, Siegfried Bethke, A. K. Honma, W. G. Scott, I. Nakamura, Silvia Arcelli, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, P. Mättig, R. Kowalewski, Austin Ball, Peter Krieger, C. K. Hargrove, Claudia Ciocca, M. Boutemeur, F. S. Merritt, Alessandro Montanari, S. A. Robins, H. Mes, I. P. Duerdoth, A. Sittler, R. Mir, Zoltan Laszlo Trocsanyi, Matthias Schröder, J. W. Gary, K. J. Anderson, R. Hawkings, Raimund Ströhmer, J. R. Carter, P. Igo-Kemenes, T. Schorner, M. Thiergen, S. Braibant, Gideon Alexander, Paolo Capiluppi, S. Baumann, K. Ishii, H. Jeremie, S. Betts, M. Hapke, Stefan Schmitt, J. Bechtluft, R. Liebisch, K. Ackerstaff, E. A. Mckigney, James Pinfold, R. Perez-Ochoa, R. Seuster, M. J. Oreglia, G. Duckeck, C. R. Jones, F. G. Oakham, D. Glenzinski, B. Schmitt, E. L. Barberio, G. N. Patrick, G. Mikenberg, P. Hüntemeyer, J. Gascon, V. Gibson, O. Schaile, Dezso Horvath, M. J. Losty, Ehud Duchovni, R. J. Barlow, Jean-Arcady Meyer, A. D. Schaile, Gabriella Pasztor, V. Zacek, K. Roscoe, W.J. McDonald, J. Lauber, S. Robertson, M. F. Turner-Watson, F. Scharf, M. Fierro, M. Jimack, Ekg Sarkisyan, R. G. Kellogg, T. Kobayashi, P. Vannerem, German Martinez, N. K. Watson, Tara Shears, D. Lui, S. M. Gascon-Shotkin, Shoji Asai, A. Michelini, Beatrix Dienes, Peter R Hobson, D. S. Koetke, Reda Tafirout, Klaus Kurt Desch, G. D. Lafferty, D. I. Futyan, Sven Menke, Marcello Mannelli, I. J. Bloodworth, E. Torrence, Richard Teuscher, A. S. Turcot, Dave Charlton, D. Zer-Zion, K. Stoll, G. A. Snow, Andris Skuja, J. Goldberg, Claire Shepherd-Themistocleous, Stefano Marcellini, F. Fiedler, B. Nellen, C. P. Ward, S. D. Talbot, S. Petzold, C. Y. Chang, E. Clay, Sachio Komamiya, R. L. Coxe, M. Przybzien, M. A. Thomson, Theodoros Geralis, G. W. Wilson, P. G. Estabrooks, R. K. Keeler, W. M. Sang, S. Söldner-Rembold, Tetsuro Mashimo, Yoram Rozen, P. Taras, A. Hocker, R. Bürgin, P. Vikas, E. K. U. Gross, D. Eatough, D. Chrisman, G. D. Long, D. Lanske, J. Letts, A. A. Faust, W. R. Gibson, Volker Blobel, S. R. Lautenschlager, M. Sproston, T. P. Kokott, P. M. Watkins, H. G. Evans, M. Kolrep, W. Gorn, T. Saeki, S. D. Bird, I. Cohen, Georges Azuelos, T. Behnke, E. Tsur, J. Polok, A. Joly, D. Karlen, O. Runolfsson, Christoph Rembser, Alessandra Fanfani, D. Axen, R. Davis, Satoru Yamashita, M. Verzocchi, K. W. Bell, A. M. Rossi, K. Sachs, Shlomo Dado, A. Jawahery, A. Macchiolo, Claudio Grandi, P. Scharff-Hansen, J. Pálinkás, R. M. Brown, C. M. Hawkes, C. Sbarra, Lorne Levinson, Stefan Kluth, Peter Sherwood, Alexander Wagner, Shlomit Tarem, J. M. Roney, J. C. Hill, F. R. Jacob, J. Ludwig, K. Runge, Richard Nisius, A. M. Smith, P. Bock, B. List, Marco Cuffiani, S. F. Ashby, J. Schieck, W. Mohr, C. Hartmann, D. E. Plane, Stephen Hillier, Paul Kyberd, F. K. Loebinger, G. M. Dallavalle, Michael Hildreth, J. Steuerer, Ivor Fleck, N. L. Rodning, B. Poli, Joleen Pater, A. Klier, P. Poffenberger, Satoshi Mihara, K. Stephens, C. Littlewood, G. Yekutieli, T. R. Junk, I. Trigger, D. R. Ward, T. Kress, A. A. Carter, Ron Folman, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, J. Böhme, P. E.L. Clarke, J. P. Martin, D. Lazic, S. De Jong, H. Rick, J. von Krogh, M. Gruwé, L. A. del Pozo, G. G. Hanson, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, M. S. Dixit, Frans Meijers, O. C. Cooke, P. Pfeifenschneider, J. Patt, André Schöning, O. Sahr, A. Biguzzi, J. G. Layter, Paolo Giacomelli, M. Hansroul, C. Burgard, R. J. Homer, Achim Stahl, Kiyotomo Kawagoe, R. Van Kooten, K. R. Hossain, D. C. Imrie, G. P. Siroli, Christoph Schwick, F. Wäckerle, D. M. Gingrich, D. M. Strom, M. Fanti, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, K. Nagai, Shigenori Tanaka, D. R. Rust, A. M. Lee, E. von Törne, P. S. Wells, Terry Richard Wyatt, A. T. Watson, A. Macpherson, R. J. Sobie, R. Howard, J. S. White, Gregor Herten, J. E. Pilcher, A. W. Lloyd, M. Hauschild, and C. Markopoulos

Subjects
Physics, Particle physics, Energy distribution, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Particle identification, Nuclear physics, Tau neutrino, Pi, High Energy Physics::Experiment, Invariant mass, Limit (mathematics), Engineering (miscellaneous), ALEPH experiment
Abstract

An upper limit for the \(\tau\)–neutrino mass has been determined from the decay \(\tau\rightarrow 5\pi^{\pm}\nu_{\tau}\) using data collected with the OPAL detector from 1991 to 1995 in \(\rm e^{+}e^{-}\) collisions at \(\sqrt{s}\approx M_\mathrm{Z}\). A limit of 43.2 MeV at 95% CL is obtained using a two–dimensional method in the \(5\pi\) invariant mass and energy distribution from 22 selected events. Combining this result with OPAL's previously published measurement using \(\rm \tau^{+}\tau^{-}\rightarrow 3h^{\pm}\bar{\nu}_{\tau}+3h^{\mp}\nu_{\tau}\) decays, a new combined limit of \(m_{\nu_{\tau}}

Published
1998

42. Cascade hypernuclei in the(K−,K+)reaction on12C

Author

K. S. Chung, S. Weibe, Fujio Takeutchi, A. Higashi, Ryuichi Takashima, H. En'yo, Tomoko Yoshida, S. Makino, Tsuneo Fukuda, Y. Goto, H. Funahashi, Kenichi Yoshida, J. M. Lee, Y. Matsuyama, Toshio Motoba, S. Yokkaichi, R. Susukita, Masataka Iinuma, Satoshi Mihara, Toru Iijima, Satoru Yamashita, Yoshitaka Itow, Minoru Yoshida, J. Nakano, Y.M. Shin, Norio Saito, Yuji Matsuda, Akira Masaike, Chieko Nagoshi, M. S. Chung, I. Nomura, Masaharu Ieiri, P. Tlustý, J. K. Ahn, Shigeki Aoki, Michiko Sekimoto, K. S. Sim, K. Imai, and I. S. Park

Subjects
Physics, Nuclear and High Energy Physics, Scintillating fiber, Cascade, Order (ring theory), Atomic physics
Abstract

Cascade hypernuclei have been studied in the ${(K}^{\ensuremath{-}}{,K}^{+})$ reaction on a scintillating fiber target. The experimental result is compared with a theoretical calculation in order to extract information concerning the ${\ensuremath{\Xi}}^{\ensuremath{-}}$ nucleus potential.

Published
1998

43. Multi-photon final states in e+e− collisions at ∝s =130-172 GeV

Author

S. Petzold, G. D. Long, Tetsuro Mashimo, J. M. Roney, Anna Macchiolo, W. Gorn, Gabriella Pasztor, S. D. Bird, P. E. L. Clarke, W. Mohr, A. Posthaus, Matthias Schröder, G. A. Snow, S. R. Lautenschlager, H. A. Neal, M. Jimack, C. P. Ward, John Allison, B. Schmitt, K. Nagai, Eduardo Ros, N. K. Watson, S. M. Gascon-Shotkin, M. Thiergen, D. L. Rees, S. Söldner-Rembold, Kiyotomo Kawagoe, S. J. De Jong, Satoshi Mihara, Daniel Lellouch, Hildreth, P. Scharff-Hansen, C.J. Beeston, A. P. Wagner, Frank Fiedler, D. Axen, S. Komamiya, A. Jawahery, David G. Charlton, Gideon Bella, BT Bouwens, Rick J. Van Kooten, Eugene P. Gross, F. Wäckerle, Paolo Giacomelli, Takehiko Mori, H. J. Burckhart, Jacqueline Batley, M. Hansroul, Georges Azuelos, E. Tsur, C. M. Hawkes, S. H. Robertson, J. Goldberg, B. Nellen, N. J. Oldershaw, E. Lefebvre, J. Steuerer, A. M. Rossi, Isabel Marian Trigger, K. W. Bell, F. Scharf, German Martinez, Gideon Alexander, Otmar Biebel, Marco Verzocchi, R. Bartoldus, J. W. Gary, J. Palinkas, K. Sachs, F. Odorici, R. G. Kellogg, C. H. Shepherd-Themistocleous, R. J. Homer, D. S. Koetke, Csaba Hajdu, Stefano Marcellini, James Letts, A. D. Schaile, A. S. Turcot, P. Igo-Kemenes, Gy. Wolf, Shigenori Tanaka, Shlomo Dado, K. Ishii, K. R. Hossain, Paolo Capiluppi, P.A. Hart, H. Jeremie, H. O. Ogren, J. C. Hill, R. J. Teuscher, A. M. Smith, A. Michelini, V. Kartvelishvili, S. A. Robins, D. Rigby, R. J. Hemingway, Christoph Geich-Gimbel, D. R. Rust, J. Ludwig, B. C. Shen, K. Runge, P. Bock, J. R. Carter, P. I. Kayal, T. Behnke, Siegfried Bethke, G. Duckeck, W. G. Scott, P. G. Estabrooks, V. Gibson, H. G. Evans, P. Szymanski, M. J. Goodrick, Doug Gingrich, J. A. McKenna, I. Cohen, P. Jovanovic, I. J. Bloodworth, James Pinfold, I. Nakamura, R. Perez-Ochoa, E. do Couto e Silva, Ehud Duchovni, E. von Törne, C. R. Jones, Richard Nisius, U. Müller, T. Kress, Peter Krieger, D. G. Fong, Carla Sbarra, J. Gascon, P. Gagnon, Dezso Horvath, M. J. Losty, Sven Menke, Alessandro Montanari, A. J. Martin, K. Ackerstaff, P. M. Watkins, Takayuki Saeki, Jean-Arcady Meyer, Sherry Towers, T. Kawamoto, Marco Cuffiani, N. L. Rodning, A. Skillman, D. E. Hutchcroft, C. Dallapiccola, M. Kolrep, D. Karlen, Carsten Daniel Burgard, B. Poli, G. Mikenberg, O. Schaile, I. P. Duerdoth, Yoram Rozen, V. Zacek, A. Sittler, S. Orito, A. K. Honma, N. Altekamp, M. Foucher, Claudio Grandi, Peter Schleper, C. K. Hargrove, Zoltan Laszlo Trocsanyi, S. J. Hillier, Tara Shears, Robert McPherson, B. Stockhausen, P. Kyberd, P. Hüntemeyer, S. B. Anderson, F. K. Loebinger, D. J. Miller, A. H. Ball, Silvia Arcelli, M. F. Turner-Watson, Meirin Oan Evans, D. C. Imrie, Mathieu Doucet, M. Hapke, R. Bürgin, Marcello Mannelli, D. M. Strom, Matthew Herndon, Fabrizio Fabbri, M. Morii, Markus Schumacher, E.K.G. Sarkisian, H. Voss, G. W. Wilson, Peter R Hobson, Ivor Fleck, G. P. Siroli, S. Baumann, M. J. Pearce, U. Jost, R. Mir, Stan Bentvelsen, Christoph Schwick, J.A. Lauber, M. J. Oreglia, H. Mes, D Chrisman, E. A. Mckigney, S. Braibant, J. E. Conboy, S. D. Talbot, M. Sproston, Joleen Pater, Peter Sherwood, D. Zer-Zion, W. P. Lai, A. Fürtjes, Stefan Kluth, T. Geralis, R. D. Heuer, Shlomit Tarem, F. G. Oakham, Stefan Schmitt, Norbert Wermes, G. N. Patrick, E. L. Barberio, A. Klier, D. Eatough, R. Giacomelli, G. D. Lafferty, D. I. Futyan, Volker Blobel, P. Routenburg, T. R. Wyatt, Jochen Schieck, T. R. Junk, M. Gruwe, Hans-Christian Schultz-Coulon, Thomson, M. J. Kobel, P. Mättig, Shoji Asai, Stephen Lloyd, A. A. Faust, D. Glenzinski, Satoru Yamashita, Robert M Brown, Gregor Herten, R. Rylko, Robert Wayne Springer, M. Boutemeur, M. Fierro, J. E.G. Edwards, F. S. Merritt, T. P. Kokott, Dixit, P. W. Jeffreys, P. S. Wells, David E. Plane, B. Wilkens, J. E. Bloomer, T. Kobayashi, A. M. Lee, A. Macpherson, Richard Keeler, P. Vikas, R. J. Sobie, Robert Lahmann, R. Howard, J. S. White, Alexander Oh, J. E. Pilcher, D. Lanske, J. Bechtluft, M. Hauschild, C. Markus, G. T. Jones, E. H. Vokurka, P R Poffenberger, J. Grunhaus, C. Hartmann, H. Fischer, O. Runolfsson, Alan Watson, Matthew Jones, Reda Tafirout, Klaus Kurt Desch, W. R. Gibson, A. Joly, Lorne Levinson, B. W. Kennedy, N. I. Geddes, Roger Barlow, K. Stephens, W.John McDonald, D. Lazic, D. R. Ward, U. Ruppel, M. R. Ingram, C. Y. Chang, P. Taras, G. Yekutieli, Allen Mincer, Marcello Fanti, Julie Kirk, P. Pfeifenschneider, A. A. Carter, Ron Folman, J. Patt, André Schöning, G. G. Hanson, G.Marco Dallavalle, P. Utzat, Beatrix Dienes, L. Brigliadori, G. Giacomelli, Daniele Bonacorsi, O. C. Cooke, S. W. O'Neale, R. Davies, P. Schenk, K. J. Anderson, J. von Krogh, Frans Meijers, R. J. Hawkings, L. A. del Pozo, A. Biguzzi, A. Rooke, J. G. Layter, T. J. McMahon, R. K. Carnegie, M. Bobinski, J. A. Wilson, J.P. Martin, A. N. Bell, K. Stoll, and Andris Skuja

Subjects
Nuclear physics, Physics, Particle physics, Angular distribution, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Engineering (miscellaneous)
Published
1998

45. Measurement of the triple gauge boson coupling αW from W+W− production in e+e− collisions at =161GeV

Author

S. A. Robins, J. R. Carter, Michael Hildreth, R. Bartoldus, N. L. Rodning, B. Poli, K. Nagai, N. K. Watson, Otmar Biebel, Shigenori Tanaka, S. M. Gascon-Shotkin, U. Müller, P. Igo-Kemenes, S. R. Lautenschlager, H. A. Neal, D. R. Rust, Matthew Evans, A. M. Rossi, T. Tsukamoto, H. O. Ogren, Christoph Geich-Gimbel, A. J. Martin, K. Ishii, H. Jeremie, T. Hilse, R. E. Hughes-Jones, M. Schumacher, E. Lefebvre, T. Behnke, O. C. Cooke, V. Gibson, A. Biguzzi, O. Runolfsson, Gideon Bella, A. M. Lee, H. J. Burckhart, E. von Törne, Jacqueline Batley, J. Letts, James Pinfold, W. Matthews, U. Ruppel, M. R. Ingram, D. G. Fong, C. Lewis, O. Schaile, F. Odorici, E. do Couto e Silva, S. Robertson, S. L. Lloyd, P. Schütz, P. Gagnon, A. Rooke, J. G. Layter, J. E. Conboy, A. Fürtjes, Gregor Herten, J. Allison, C. K. Hargrove, C. Hartmann, K. Ametewee, J. Gascon, D. E. Plane, A. Macchiolo, Sven Menke, Matthias Schröder, A. Sittler, B. Wilkens, T. Omori, Gideon Alexander, M. Sasaki, J. Palinkas, Norbert Wermes, Sherry Towers, Paolo Capiluppi, M. A. Thomson, Claudio Grandi, M. Thiergen, K. Sachs, M. Boutemeur, F. S. Merritt, T. Kawamoto, V. Zacek, R. Van Kooten, J. A. McKenna, Stephen Hillier, J. E. Pilcher, Shlomo Dado, C. R. Jones, G. M. Dallavalle, Ekg Sarkisyan, Richard Nisius, P. W. Jeffreys, J. Bechtluft, S. Orito, H. M. Bosch, M. Rosvick, S. W. O'Neale, J. von Krogh, D. S. Koetke, G. W. Wilson, T. Kobayashi, Marcello Mannelli, G. G. Hanson, H. Mes, M. Hauschild, R. G. Kellogg, M. Steiert, I. P. Duerdoth, R. W.L. Jones, S. A. Wotton, Marco Cuffiani, P. Fath, D. Chrisman, G. D. Long, E. K. U. Gross, Kiyotomo Kawagoe, C. Markus, D. M. Strom, C.J. Beeston, Csaba Hajdu, G. Giacomelli, J. Lauber, Volker Blobel, M. Hapke, Dave Charlton, K. J. Anderson, T. G. Shears, Stefano Marcellini, P. Scharff-Hansen, G. T. Jones, E. H. Vokurka, P. A. Hart, G. Mikenberg, T. J. Smith, N. J. Oldershaw, B. Nijjhar, M. J. Pearce, F. Wäckerle, Joleen Pater, M. Sproston, Claire Shepherd-Themistocleous, K. Stephens, L. A. del Pozo, C. Y. Chang, D. M. Gingrich, B. Stockhausen, Paul Kyberd, F. K. Loebinger, A. M. Smith, M. S. Dixit, Frans Meijers, R. Bürgin, M. J. Oreglia, W. R. Gibson, P. Taras, Michael Kobel, J. Steuerer, J. J. Ward, S. D. Talbot, Ehud Duchovni, R. Rylko, P. E.L. Clarke, M. K. Jones, P. Vikas, S. Braibant, A. D. Schaile, A. A. Faust, B. T. Bouwens, M. Jimack, P. Berlich, P. Poffenberger, M. Fanti, Andris Skuja, J. P. Martin, Gabriella Pasztor, R. Giacomelli, R. Lahmann, Julie Kirk, D. Lanske, A. Michelini, Gunter Wolf, K. Ackerstaff, Satoru Yamashita, S. Petzold, D. Eatough, S. De Jong, G. Yekutieli, Tetsuro Mashimo, G. N. Patrick, D. C. Imrie, R. M. Brown, Lorne Levinson, T. R. Junk, H. Przysiezniak, G. A. Snow, C. P. Ward, A. A. Carter, Ron Folman, Robert McPherson, G. P. Siroli, A. N. Bell, I. Trigger, A. Skillman, A. Joly, Mathieu Doucet, S. Söldner-Rembold, W. Gorn, S. D. Bird, R. D. Heuer, N. I. Geddes, P. Schenk, C. Sbarra, P. S. Wells, Fabrizio Fabbri, D. R. Ward, T. Kress, D. L. Rees, P. Utzat, A. T. Watson, Reda Tafirout, Klaus Kurt Desch, J. E. Bloomer, F. Scharf, German Martinez, D. Axen, A. I. McNab, A. Macpherson, J. Goldberg, A. Jawahery, T. R. Wyatt, T. J. McMahon, J. M. Roney, R. J. Sobie, B. Nellen, R. K. Carnegie, M. Herndon, R. Howard, M. Bobinski, R. J. Barlow, J. A. Wilson, J. S. White, W. Mohr, Peter Sherwood, A. Posthaus, D. Lazic, Alexander Wagner, M. Fierro, J. E.G. Edwards, J. Ludwig, K. Runge, P. Bock, H. G. Evans, M. J. Goodrick, I. Cohen, Stefan Kluth, Shlomit Tarem, R. W. Springer, Achim Stahl, Daniel Lellouch, Paolo Giacomelli, M. Hansroul, C. Burgard, Takehiko Mori, R. J. Homer, Georges Azuelos, E. Tsur, C. M. Hawkes, P. Pfeifenschneider, J. Patt, M. Verzocchi, K. W. Bell, J. C. Hill, B. C. Shen, Siegfried Bethke, A. K. Honma, W. G. Scott, I. Nakamura, J. W. Gary, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Sachio Komamiya, Stefan Schmitt, Theodoros Geralis, M. Gruwe, E. Ros, U. Jost, R. Mir, T. P. Kokott, R. Hawkings, W.J. McDonald, P. Mättig, Shoji Asai, J. Grunhaus, I. J. Bloodworth, S. B. Anderson, P. Szymanski, Stan Bentvelsen, F. G. Oakham, Hans-Christian Schultz-Coulon, B. Schmitt, E. L. Barberio, Michael Schulz, Yoram Rozen, G. Duckeck, M. Foucher, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. Zer-Zion, P. Routenburg, D. Karlen, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, A. S. Turcot, F. Fiedler, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, M. Kolrep, D. E. Hutchcroft, C. Dallapiccola, N. Altekamp, D. J. Miller, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, Silvia Arcelli, E. A. Mckigney, W. P. Lai, G. D. Lafferty, and H. M. Fischer

Subjects
Semileptonic decay, Coupling, Physics, Nuclear and High Energy Physics, Particle physics, Gauge boson, Luminosity (scattering theory), Electron–positron annihilation, law.invention, Standard Model, Nuclear physics, Coupling parameter, law, High Energy Physics::Experiment, Collider
Abstract

This letter describes a measurement of one of the anomalous triple gauge boson couplings using the first data recorded by the OPAL detector at LEP2. A total of 28 W-pair candidates have been selected for an integrated luminosity of 9.89+/-0.06 pb(-1) recorded at a centre-of-mass energy of 161 GeV. We use these data to place constraints upon the coupling parameter alpha(W phi). We analyse the predicted variation of the total cross-section for all observed channels and the distribution of kinematic variables in the semileptonic decay channels. We measure alpha(W phi) to be -0.61(-0.61)(+0.73)+/-0.35, which is consistent with the Standard Model expectation of zero. (C) 1997 Published by Elsevier Science B.V.

Published
1997

46. Search for unstable neutral and charged heavy leptons in e+e− collisions at =164

Author

R. K. Carnegie, M. Bobinski, J. A. Wilson, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, Gideon Bella, H. J. Burckhart, G. Yekutieli, Jacqueline Batley, James Pinfold, Otmar Biebel, A. A. Carter, Ron Folman, B. J. King, P. Utzat, N. J. Oldershaw, D. G. Charlton, D. G. Fong, C. Lewis, Paolo Giacomelli, Marco Verzocchi, M. Hansroul, J. Grunhaus, J. Gascon, J.A. Lauber, P. Szymanski, C. H. Shepherd-Themistocleous, C. R. Jones, Michael Schulz, J. M. Roney, Tsunehiko Omori, R. J. Homer, H. Fischer, A. I. McNab, S. H. Robertson, J. Goldberg, Sherry Towers, V. Zacek, A. Rooke, J. G. Layter, J. Steuerer, T. Kawamoto, B. Nellen, Stefan Schmitt, P. Igo-Kemenes, K. Ishii, H. Jeremie, S. Orito, M. Rosvick, W.J. McDonald, T. Behnke, R. E. Hughes-Jones, H. G. Evans, Marcello Mannelli, Richard Nisius, M. J. Kobel, P. Mättig, Shoji Asai, M. J. Goodrick, I. Cohen, V. Gibson, S. Komamiya, I. J. Bloodworth, P. E. L. Clarke, W. Mohr, Marco Cuffiani, E. do Couto e Silva, Andris Skuja, G. Duckeck, R. W. L. Jones, Shigenori Tanaka, R. Bürgin, S. Petzold, Markus Schumacher, Sven Menke, R. Bartoldus, G. D. Long, Yoram Rozen, M. F. Turner-Watson, Meirin Oan Evans, D. R. Rust, M. Morii, K. Ametewee, Peter R Hobson, A. Posthaus, J. W. Gary, M. Foucher, H. O. Ogren, Christoph Geich-Gimbel, Tetsuro Mashimo, U. Jost, R. Mir, Carla Sbarra, J. E. Conboy, Gideon Alexander, Paolo Capiluppi, S. L. Lloyd, G. W. Wilson, A. Fürtjes, T. Geralis, R. D. Heuer, F. G. Oakham, E. L. Barberio, W. Matthews, H. Mes, Matthias Schröder, F. S. Merritt, A. Skillman, M. Hapke, D. Rigby, R. J. Hemingway, A. Stahl, P. Vikas, P. Pfeifenschneider, M. Thiergen, J. Bechtluft, W. Gorn, J. A. McKenna, F. Strumia, S. D. Talbot, P. Jovanovic, J. Patt, Peter Krieger, E. von Törne, M. J. Oreglia, P. Schütz, S. Braibant, K. Ackerstaff, Manuella Vincter, Daniel Lellouch, Alessandro Montanari, Takehiko Mori, D. E. Hutchcroft, C. Dallapiccola, M. Sproston, P. S. Wells, G. Mikenberg, G. N. Patrick, P.A. Hart, P. Routenburg, A. T. Watson, M. Gruwe, J. E. Bloomer, D. Glenzinski, Stan Bentvelsen, A. K. Honma, N. Altekamp, A. D. Schaile, A. S. Turcot, T. P. Kokott, Satoru Yamashita, B. Schmitt, H-C. Schultz-Coulon, Stefan Kluth, Shlomit Tarem, D. M. Strom, Matthew Herndon, R. Rylko, J.P. Martin, U. Müller, A. J. Martin, H. Przysiezniak, C. K. Hargrove, M. Kolrep, B. Nijjhar, M. J. Pearce, U. Ruppel, M. R. Ingram, R. J. Sobie, R. Howard, J. S. White, A. N. Bell, Eduardo Ros, D. Axen, A. Jawahery, BT Bouwens, N. K. Watson, R. Van Kooten, S. M. Gascon-Shotkin, R. W. Springer, J. Ludwig, K. Runge, P. Bock, S. B. Anderson, C.J. Beeston, T. G. Shears, A. M. Rossi, G. G. Hanson, T. Tsukamoto, F. Scharf, German Martinez, Eugene P. Gross, F. Wäckerle, Norbert Wermes, A. Michelini, Gy. Wolf, P. Berlich, G. Giacomelli, T. J. Smith, K. Stephens, D. Karlen, O. Schaile, P. Schenk, P. Gagnon, T. R. Junk, J. Allison, S. A. Robins, Robert McPherson, A. Sittler, Mathieu Doucet, Fabrizio Fabbri, Gregor Herten, P. Kyberd, H. M. Bosch, M. S. Dixit, Frans Meijers, B. Wilkens, J. R. Carter, P. Scharff-Hansen, D. Lazic, J. E. Pilcher, A. Joly, D. R. Ward, M. Hauschild, S. A. Wotton, C. Markus, G. T. Jones, N. I. Geddes, E. H. Vokurka, P R Poffenberger, S. J. De Jong, A. M. Smith, Frank Fiedler, B. Stockhausen, F. K. Loebinger, I. P. Duerdoth, B. C. Shen, Joleen Pater, P. Fath, Peter Sherwood, Siegfried Bethke, W. G. Scott, I. Nakamura, A. H. Ball, Silvia Arcelli, R. Giacomelli, Dezso Horvath, M. J. Losty, E. A. Mckigney, E. Lefebvre, W. P. Lai, F. Odorici, Jean-Arcady Meyer, G. D. Lafferty, Carsten Daniel Burgard, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, M. Jimack, D Chrisman, Kiyotomo Kawagoe, A. P. Wagner, Matthew Jones, D. C. Imrie, R. G. Kellogg, M. Steiert, D. J. Miller, Doug Gingrich, G. P. Siroli, Reda Tafirout, Klaus Kurt Desch, D. S. Koetke, Csaba Hajdu, T. Kress, Stefano Marcellini, T. R. Wyatt, K. Nagai, Michael Hildreth, James Letts, Georges Azuelos, N. L. Rodning, E. Tsur, C. M. Hawkes, R. J. Barlow, Isabel Marian Trigger, K. W. Bell, J. C. Hill, B. Poli, M. Boutemeur, M. Fierro, W. R. Gibson, Ehud Duchovni, J. E.G. Edwards, S. J. Hillier, Lorne Levinson, B. W. Kennedy, M. Sasaki, C. Y. Chang, Volker Blobel, P. Taras, Robert M Brown, J. Palinkas, K. Sachs, Shlomo Dado, Ekg Sarkisyan, P. W. Jeffreys, T. Kobayashi, C. Hartmann, D. E. Plane, Julie Kirk, G. M. Dallavalle, A. M. Lee, O. Runolfsson, Robert Lahmann, J. J. Ward, M. A. Thomson, D. Lanske, Gabriella Pasztor, G. A. Snow, S. R. Lautenschlager, H. A. Neal, C. P. Ward, D. L. Rees, S. Söldner-Rembold, S. W. O'Neale, K. J. Anderson, T. Hilse, Claudio Grandi, and T. J. McMahon

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Lepton
Published
1997

47. The development of time projection chamber front-end ASIC for the neutron lifetime measurement

Author

Manobu M. Tanaka, Harumichi Yokoyama, Satoru Yamashita, Takahito Yamada, and Kenji Mishima

Subjects
Physics, Front and back ends, Time projection chamber, Application-specific integrated circuit, business.industry, Dynamic range, Heat generation, Amplifier, Electrical engineering, Electronic engineering, Neutron, business, Noise (electronics)
Abstract

We developed a front-end ASIC amplifier of time projection chamber for an experiment to measure neutron lifetime. The precise determination of neutron lifetime is very important to understand the early universe in Big bang nucleosynthesis. The heat generation of frond-end amplifier may become the potential systematic uncertainty in determining the lifetime. In order to overcome this deficit, we have designed an ASIC with low power consumption. The ASIC integrates 8 identical channels, each consisting of pre-amplifier, followed by pole-zelo cancellation circuit, two-step shapers, and analog current buffer. In performances tests, this amplifier features a conversion gain of 1 V/pC, the dynamic range of +− 2 pC, an output width of 0.5 us and a power consumption of 9 mW/ch, which saftisfied the requirement of our experiment.

Published
2013

48. New Constraint on the Existence of theμ+→e+γDecay

Author

H. Natori, X. Bai, L. Galli, C. Cerri, Stefan Ritt, P. W. Cattaneo, Flavio Gatti, Giovanni Signorelli, Yasunori Fujii, M. Panareo, T. Iwamoto, Y. Hisamatsu, O. Kiselev, Y. Nishimura, Akira Yamamoto, A. Maki, A. M. Baldini, C. Voena, A. Graziosi, A. S. Korenchenko, P.R. Kettle, F. Sergiampietri, E. Baracchini, B. Golden, C. Bemporad, A.S. Popov, Roberto Di Nardo, F.V. Ignatov, Z. You, Wataru Ootani, B.I. Khazin, N. Kravchuk, G. Cavoto, F. Tenchini, J. Egger, A. de Bari, Satoru Yamashita, G. Piredda, Tomiyoshi Haruyama, S. Yamada, Ryu Sawada, D. Mzavia, D.N. Grigoriev, G. Boca, F. Xiao, Fabrizio Cei, N. Khomotov, G. M. A. Lim, M. De Gerone, Takehiko Mori, Yusuke Uchiyama, W. R. Molzon, Marco Grassi, M. Hildebrandt, Donato Nicolo, S. Suzuki, S. Dussoni, M. Rossella, D. Zanello, D. Kaneko, Yu.V. Yudin, Satoshi Mihara, Tadayoshi Doke, F. Renga, E. Ripiccini, J. Adam, Angela Papa, Hajime Nishiguchi, and C. Topchyan

Subjects
Physics, Particle physics, Muon, Branching fraction, General Physics and Astronomy, Supersymmetry, Lepton
Abstract

The analysis of a combined data set, totaling $3.6\ifmmode\times\else\texttimes\fi{}{10}^{14}$ stopped muons on target, in the search for the lepton flavor violating decay ${\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\gamma}$ is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of $5.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.

Published
2013

49. The MEG detector for μ +→e+ γ decay search

Author

F. Renga, C Topchyan, Angela Papa, A. Graziosi, Yasuhiro Nishimura, Donato Nicolo, Bi Khazin, Hajime Nishiguchi, Am Baldini, M. Rossella, N. P. Kravchuk, E. Ripiccini, G. M. A. Lim, Y. Hisamatsu, S. Galeotti, N. Curalli, Malte Hildebrandt, Luca Galli, A.S. Popov, D. Kaneko, K. Ozone, D. Mzavia, M. De Gerone, Roberto Di Nardo, C. Cerri, M. Corbo, F. Tenchini, G. Piredda, S. Yamada, Giovanni Signorelli, M. Schneebeli, H. Natori, C. Bemporad, S. Yamamoto, A. S. Korenchenko, Flavio Gatti, L. Del Frate, Ryu Sawada, Pw Cattaneo, D. Zanello, R. Valle, Satoshi Mihara, T. Iwamoto, W. R. Molzon, M. Panareo, K. Fratini, Pr Kettle, E Baracchini, Fabrizio Cei, F.V. Ignatov, X. Bai, Marco Grassi, S. Doke, C. Voena, F. Morsani, F. Raffaelli, Katsuyu Kasami, R. Pazzi, Wataru Ootani, Yuki Fujii, G. Gallucci, Satoru Yamashita, F Xiao, G. Cavoto, Gianluigi Boca, A. Maki, A. de Bari, Tomiyoshi Haruyama, Stefan Ritt, Yv Yudin, J. Adam, O. Kiselev, F. Sergiampietri, D.N. Grigoriev, S. Suzuki, Takehiko Mori, Yusuke Uchiyama, S. Dussoni, B Golden, J. Egger, J., Adam, X., Bai, A. M., Baldini, E., Baracchini, C., Bemporad, G., Boca, P. W., Cattaneo, G., Cavoto, F., Cei, C., Cerri, M., Corbo, N., Curalli, A., De Bari, M., De Gerone, L., Del Frate, S., Doke, S., Dussoni, J., Egger, K., Fratini, Y., Fujii, L., Galli, S., Galeotti, G., Gallucci, F., Gatti, B., Golden, M., Grassi, A., Graziosi, D. N., Grigoriev, T., Haruyama, M., Hildebrandt, Y., Hisamatsu, F., Ignatov, T., Iwamoto, D., Kaneko, K., Kasami, P. R., Kettle, B. I., Khazin, O., Kiselev, A., Korenchenko, N., Kravchuk, G., Lim, A., Maki, S., Mihara, W., Molzon, T., Mori, F., Morsani, D., Mzavia, R., Nardò, H., Natori, D., Nicolò, H., Nishiguchi, Y., Nishimura, W., Ootani, K., Ozone, Panareo, Marco, A., Papa, R., Pazzi, G., Piredda, A., Popov, F., Raffaelli, F., Renga, E., Ripiccini, S., Ritt, M., Rossella, R., Sawada, M., Schneebeli, F., Sergiampietri, G., Signorelli, S., Suzuki, F., Tenchini, C., Topchyan, Y., Uchiyama, R., Valle, C., Voena, F., Xiao, S., Yamada, S., Yamamoto, S., Yamashita, Yudin, Y. u. V., and D., Zanello

Subjects
Physics, Antiparticle, Muon, Spectrometer, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Photon energy, Charged Lepton Flavor Violation, Particle detector, Lepton, Nuclear physics, Particle decay, Positron, Physics::Accelerator Physics, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract

The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay μ +→e+ γ by using one of the most intense continuous μ + beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus., The European Physical Journal C, 73 (4), ISSN:1434-6044, ISSN:1434-6052

Published
2013

50. Strangelet search and light nucleus production in relativistic Si+Pt and Au+Pt collisions

Author

R. Sukaton, Koji Yamamoto, D. M. Wolfe, K. Okada, R. Magahiz, R. A. Schumacher, R. Stotzer, Frank E. Merrill, J. M. Nelson, R. J. Sutter, R. Zybert, Satoshi Mihara, Fujio Takeutchi, R. E. Chrien, J. Lowe, K. Imai, G. Diebold, H. Fischer, M. Burger, B. Bassalleck, S. Yokkaichi, Hans von der Schmitt, Satoru Yamashita, P. Pile, G. B. Franklin, R. Sawafta, H. En'yo, Norio Saito, J. Franz, R. L. Stearns, T. Bürger, B. P. Quinn, E. Rössle, R. McCrady, T. Iijima, V. Zeps, Akira Masaike, Adam Rusek, A. Berdoz, and C. A. Meyer

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Light nucleus, Strangelet, Null (mathematics), Quark–gluon plasma, Production (computer science), Charge (physics), Heavy ion, Sensitivity (control systems), Atomic physics
Abstract

A strangelet search in Si+Pt and Au+Pt collisions at alternating-gradient synchrotron (AGS) energies, using a focusing spectrometer, sensitive to mass per charge of 3-14 GeV/${\mathit{c}}^{2}$ was conducted during the 1992 and 1993 heavy ion runs at the AGS. The null results thereof are presented as upper limits on the invariant production cross section, in the range of ${10}^{\ensuremath{-}5}$-${10}^{\ensuremath{-}4}$ mb ${\mathit{c}}^{3}$/${\mathrm{GeV}}^{2}$, and model dependent sensitivity limits in the range of ${10}^{\ensuremath{-}7}$-${10}^{\ensuremath{-}5}$ per collision. Measurements of the production cross sections of several nonstrange nuclear systems, from $p$ to $^{7}\mathrm{Be}$ and $^{8}\mathrm{Li}$, the background of the strangelet search, are also presented.

Published
1996

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