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Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at sNN=130GeV

Physical Review Letters 2001年第2期88卷 022301-022301页

作者： K. Adcox S. S. Adler N. N. Ajitanand Y. Akiba J. Alexander L. Aphecetche Y. Arai S. H. Aronson R. Averbeck T. C. Awes K. N. Barish P. D. Barnes J. Barrette B. Bassalleck S. Bathe V. Baublis A. Bazilevsky S. Belikov F. G. Bellaiche S. T. Belyaev M. J. Bennett Y. Berdnikov S. Botelho M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. Burward-Hoy S. Butsyk T. A. Carey P. Chand J. Chang W. C. Chang L. L. Chavez S. Chernichenko C. Y. Chi J. Chiba M. Chiu R. K. Choudhury T. Christ T. Chujo M. S. Chung P. Chung V. Cianciolo B. A. Cole D. G. D'Enterria G. David H. Delagrange A. Denisov A. Deshpande E. J. Desmond O. Dietzsch B. V. Dinesh A. Drees A. Durum D. Dutta K. Ebisu Y. V. Efremenko K. El Chenawi H. En'yo S. Esumi L. Ewell T. Ferdousi D. E. Fields S. L. Fokin Z. Fraenkel A. Franz A. D. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn A. L. Godoi Y. Goto S. V. Greene M. Grosse Perdekamp S. K. Gupta W. Guryn H.-Å. Gustafsson J. S. Haggerty H. Hamagaki A. G. Hansen H. Hara E. P. Hartouni R. Hayano N. Hayashi X. He T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill D. S. Ho K. Homma B. Hong A. Hoover T. Ichihara K. Imai M. S. Ippolitov M. Ishihara B. V. Jacak W. Y. Jang J. Jia B. M. Johnson S. C. Johnson K. S. Joo S. Kametani J. H. Kang M. Kann S. S. Kapoor S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. J. Kim H. J. Kim S. Y. Kim Y. G. Kim W. W. Kinnison E. Kistenev A. Kiyomichi C. Klein-Boesing S. Klinksiek L. Kochenda V. Kochetkov D. Koehler T. Kohama D. Kotchetkov A. Kozlov P. J. Kroon K. Kurita M. J. Kweon Y. Kwon G. S. Kyle R. Lacey J. G. Lajoie J. Lauret A. Lebedev D. M. Lee M. J. Leitch X. H. Li Z. Li D. J. Lim M. X. Liu X. Liu Z. Liu C. F. Maguire J. Mahon Y. I. Makdisi V. I. Manko Y. Mao S. K. Mark S. Markacs G. Martinez M. D. Marx A. Masaike F. Matathias T. Matsumoto P. L. McGaughey E. Melnikov M. Merschmeyer F. Messer M. Messer Y. Miake T. E. Miller A. Milov S. Mioduszewski R. E. Mischke G. C. Mishra J. T. Mitchell A. K. Mohanty D. P. Morrison J. M. Moss F. Mühlbacher M. Mu Vanderbilt University Nashville Tennessee 37235 Brookhaven National Laboratory Upton New York 11973-5000 Chemistry Department State University of New York–Stony Brook Stony Brook New York 11794 KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan SUBATECH (Ecole des Mines de Nantes IN2P3/CNRS Universite de Nantes) BP 20722-44307 Nantes-cedex 3 France Department of Physics and Astronomy State University of New York–Stony Brook Stony Brook New York 11794 Oak Ridge National Laboratory Oak Ridge Tennessee 37831 University of California–Riverside Riverside California 92521 Los Alamos National Laboratory Los Alamos New Mexico 87545 McGill University Montreal Quebec H3A 2T8 Canada University of New Mexico Albuquerque New Mexico 87131 Institut für Kernphysik University of Münster D-48149 Münster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Russia Institute for High Energy Physics (IHEP) Protvino Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 Iowa State University Ames Iowa 50011 Russian Research Center “Kurchatov Institute” Moscow Russia St. Petersburg State Technical University St. Petersburg Russia Universidade de São Paulo Instituto de Física Caixa Postal 66318 São Paulo CEP05315-970 Brazil New Mexico State University Las Cruces New Mexico 88003 Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 Institute of Physics University of Tsukuba Tsukuba Ibaraki 305 Japan Korea University Seoul 136-701 Korea Nagasaki Institute of Applied Science Nagasaki-shi Nagasaki 851-0193 Japan Kyoto University Kyoto 606 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Weizmann Institute Rehovot 76100 Israel Florida State University Tallahassee Florida 32306 Department of Physics L

Transverse momentum spectra for charged hadrons and for neutral pions in the range 1GeV/c<pT<5GeV/c have been measured by the PHENIX experiment at RHIC in Au+Au collisions at sNN=130GeV. At high pT the spectra f... 详细信息

Transverse momentum spectra for charged hadrons and for neutral pions in the range 1GeV/cnuclear collisions are consistent with scaling the spectra from p+p collisions by the average number of binary nucleon-nucleon collisions. The spectra from central collisions are significantly suppressed when compared to the binary-scaled p+p expectation, and also when compared to similarly binary-scaled peripheral collisions, indicating a novel nuclear-medium effect in central nuclear collisions at RHIC energies.

关键词： High energy physics

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A room temperature unipolar quantum dot intersubband long wavelength (13.3 /spl mu/m) laser

A room temperature unipolar quantum dot intersubband long wa...

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IEEE Photonics Conference (IPC)

作者： S. Krishna P. Bhattacharya J. Singh J. Urayama T.B. Norris P.J. McCann K. Namjou Applied Physics Program Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA School of Electrical and Computer Engineering University of Oklahama Norman OK USA

Summary form only given. We report the room temperature operation of a novel unipolar self-organized quantum dot FIR laser (13.3 /spl mu/m) based on transitions between discrete bound electron states in self-organized... 详细信息

关键词： Quantum dot lasers US Department of Transportation Electrons Infrared detectors Stationary state Finite impulse response filter Land surface temperature Infrared spectra Spectroscopy Laser radar

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Development of novel photodiodes as a photon counter

Development of novel photodiodes as a photon counter

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2000 IEEE nuclear science Symposium Conference Record

作者： Miyachi, T. Edamura, T. Furuta, S. Hasebe, N. Higuchi, M. Ishiwata, M. Kan, H. Kikuchi, R. Masumura, T. Matsuyama, T. Misaki, A. Nakamura, I. Sugawara, T. Tazawa, T. Tezuka, C. Center for Nuclear Study University of Tokyo Riken Campus Wako 351-0198 Japan Adv. Res. Inst. for Sci. and Eng. Waseda University Tokyo 169-8555 Japan Department of Applied Physics Faculty of Engineering Tohoku Gakuin University Tagajo 985-0873 Japan Laboratory of Nuclear Science Tohoku University Sendai 982-0826 Japan Department of Physics Faculty of Science Saitama University Urawa 338-8570 Japan Graduate School of Science Kyoto University Kyoto 606-8502 Japan Central Research Laboratory Hamamatsu Photonics K.K. Hamakita 434-0041 Japan

Superlattice type photodiodes of a GaAs-AlXGa1-XAs structure were studied at room temperature. A combination of potential-well width and barrier width was sensitive to the charge multiplication factor. Using a diode of 10nm well and 15nm barrier, the detector characteristics were investigated from a point of view of achieving a high gain. This type of photodiodes was confirmed to be sensitive to Cherenkov light generated in water. Effects of carrier doping up to 1018cm-3 at room temperature on the multiplication rate is discussed.

关键词： Photodiodes

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Development of hydrophones for detecting high-energy reactions in water

Development of hydrophones for detecting high-energy reactio...

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2000 IEEE nuclear science Symposium Conference Record

作者： Miyachi, T. Goto, S. Hasebe, N. Higuchi, M. Hinode, F. Ishiwata, M. Kikuchi, R. Konno, O. Masumura, T. Matsuyama, T. Misaki, A. Nakamura, I. Oyamada, M. Sato, M. Tazawa, Y. Tezuka, C. Center for Nuclear Study University of Tokyo Riken Wako 351-0198 Japan Adv. Inst. for Sci. and Eng. Waseda University Tokyo 169-8555 Japan Department of Applied Physics Faculty of Engineering Tohoku Gakuin University Tagajo 985-0873 Japan Laboratory of Nuclear Science Tohoku University Sendai 982-0826 Japan Department of Physics Faculty of Science Saitama University Urawa 338-8570 Japan Graduate School of Science Kyoto University Kyoto 606-8502 Japan Honda-Electronics Co. Ltd Toyohashi 441-3193 Japan Ichinoseki Natl. College of Technol. Ichinoseki 021-8511 Japan

Acoustic detectors were developed using a piezo ceramic compound PZT. A shape of the PZT detector was essential to obtain a high sensitivity. A detector of a spherically shaped shell structure, whose size was 50mm in diameter and 2mm thick, was fabricated. Its sensitivity was calibrated to be about 40mV/Pa at 54kHz. Using the hydrophone, acoustic signals generated by an electron-induced cascade shower in water were detected. Experimental results were compared with simulation data and confirmed a consistency in between.

关键词： Radiation detectors

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Development of hydrophones for detecting high-energy reactions in water

Development of hydrophones for detecting high-energy reactio...

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IEEE Symposium on nuclear science (NSS/MIC)

作者： T. Miyachi S. Goto N. Hasebe M. Higuchi F. Hinode M. Ishiwata R. Kikuchi O. Konno T. Masumura T. Matsuyama A. Misaki I. Nakamura M. Oyamada M. Sato Y. Tazawa C. Tezuka Center for Nuclear Study University of Tokyo Tokyo Japan Honda-Electronics Company Limited Toyohashi Japan Advanced Institute for Science and Engineering Waseda University Tokyo Japan Department of Applied Physics Faculty of Engineering Tohoku Gakuin University Tagajo Japan Laboratory of Nuclear Science University of Tohoku Sendai Japan Department of Physics Faculty of Science Saitama University Urawa Japan Graduate School of Science Kyoto University Kyoto Japan Ichinoseki National College of Technology Ichinoseki Japan

Acoustic detectors were developed using a piezo ceramic compound PZT. The shape of the PZT detector was essential to obtain a high sensitivity. A detector of a spherically shaped shell structure, whose size was 50 mm in diameter and 2 mm thick, was fabricated. Its sensitivity was calibrated to be about 40 mV/Pa at 54 kHz. Using the hydrophone, acoustic signals generated by an electron-induced cascade shower in water was detected. Experimental results were compared with simulation data and confirmed consistency.

关键词： Sonar equipment Acoustic signal detection Ceramics Shape Frequency response physics Radiation detectors Silver nuclear and plasma sciences Structural shells

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Development of novel photodiodes as a photon counter

Development of novel photodiodes as a photon counter

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IEEE Symposium on nuclear science (NSS/MIC)

作者： T. Miyachi T. Edamura S. Furuta N. Hasebe M. Higuchi M. Ishiwata H. Kan R. Kikuchi T. Masumura T. Matsuyama A. Misaki I. Nakamura T. Sugawara T. Tazawa C. Tezuka Center for Nuclear Study University of Tokyo Wako Japan Central Research Laboratory Hamamatsu Photonics K.K. Hamakita Japan Advanced Research Institute for Science and Engineering Waseda University Tokyo Japan Department of Applied Physics Faculty of Engineering Tohoku Gakuin University Tagajo Japan Department of Physics Faculty of Science Saitama University Urawa Japan Graduate School of Science Kyoto University Kyoto Japan Laboratory of Nuclear Science Tohoku University Sendai Japan

Superlattice type photodiodes of a GaAs-Al/sub x/Ga/sub 1-x/As structure were studied at room temperature. A combination of potential-well width and barrier width was sensitive to the charge multiplication factor. Using a diode with a 10 nm well and a 15 nm barrier, the detector characteristics were investigated from a point of view of achieving a high gain. This type of photodiode was confirmed to be sensitive to Cherenkov light generated in water. Effects of carrier doping up to 10/sup 18/ cm/sup -3/ at room temperature on the multiplication rate is discussed.

关键词： Photodiodes Counting circuits Semiconductor diodes Detectors Ocean temperature physics Gallium arsenide Photoconductivity Dark current Voltage

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Performance of the belle silicon vertex detector

Performance of the belle silicon vertex detector

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2000 IEEE nuclear science Symposium Conference Record

作者： Abe, R. Aihara, H. Alimonti, G. Asano, Y. Bakich, A. Banaś, E. Bozek, A. Browder, T. Dragic, J. Everton, C. Fukunaga, C. Gordon, A. Guler, H. Haba, J. Hara, K. Hara, T. Hastings, N. Hazumi, M. Heenan, E. Higuchi, T. Hojo, T. Ishino, H. Iwai, G. Jalocha, P. Kaneko, J. Kapusta, P. Kawasaki, T. Korotuschenko, K. Lange, J.S. Li, Y. Marlow, D. Matsubara, T. Miyake, H. Moffitt, L. Moloney, G. Mori, S. Nakadaira, T. Nakamura, T. Natkaniec, Z. Okuno, S. Olsen, S. Ostrowicz, W. Palka, H. Peak, L. Rózańska, M. Ryuko, J. Sevior, M. Shimada, K. Sumisawa, K. Stanic, S. Stock, R. Swain, S. Tagomori, H. Tajima, H. Takahashi, S. Takasaki, F. Tamura, N. Tanaka, J. Tanaka, M. Taylor, G. Tomura, T. Trabelsi, K. Tsuboyama, T. Tsujita, Y. Varner, G. Varvell, K. Yamamoto, H. Watanabe, Y. Yamada, Y. Yokoyama, M. Zhao, H. Žontar, D. University Frankfurt Institute for Nuclear Physics August-Euler-Strasse 6 60486 Frankfurt/Main Germany University of Hawaii 2505 Correa Road Honolulu HI 96822 United States Faculty of Engineering Kanagawa University 3-27-1 Rokkakubashi Kanagawa Yokohama 221-8686 Japan KEK High Energy Accelerator Res. Org Inst. of Particle and Nuclear Studs. 1-1 Oho Tsukuba-shi Ibaraki-ken 305-0801 Japan Institute of Nuclear Physics Krakow ul. Kawiory 26a PL-30-055 Krakow Poland School of Physics University of Melbourne Parkville Vic. 3079 Australia Graduate School of Sci. and Technol. Niigata University 8050 Nino-cho Ikarashi Niigata 950-2181 Japan Dept. of Physics Graduate School of Science Osaka University 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan Physics Dept. Princeton University PO Box 708 Princeton NJ 08544 United States School of Physics University of Sydney School of Physics Sydney NSW 2006 Australia Dept. of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Physics Dept. Tokyo Institute of Technology 2-12-1 Oh-okayama Megro-ku Tokyo 152 Japan Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji Tokyo 192-0397 Japan Institute of Applied Physics University of Tsukuba 1-1-1 Tenodai Tsukuba-shi Ibaraki-ken 305 Japan

The performance of the Silicon Vertex Detector (SVD) in the Belle experiment is reviewed based on 6.8 fb-1 of data taken between October 1999 and July 2000. The main purpose of the SVD is to make precise measurements of the B decay vertex position, which are essential for the observation of CP asymmetries. Excellent vertex resolution and a good detection efficiency are required for the SVD. Basic performance parameters such as signal pulse height, noise, strip yield and intrinsic resolution are reported. The SVD performance parameters which are directly related to physics analysis such as track matching efficiency, impact parameter resolution and vertex resolution are also shown.

关键词： Particle detectors

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keV-neutron capture cross sections of light nuclei and nucleosynthesis

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AIP Conference Proceedings 2000年第1期529卷 458-465页

作者： Toshiro Ohsaki Yasuki Nagai Masayuki Igashira Tatsushi Shima Hideo Kitazawa Kenji Takaoka Mitsutaka Kinoshita Yuriko Nobuhara Atsushi Tomyo Hiroyuki Makii Kenji Mishima 1Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo 152-8550 Japan 2Department of Applied Physics Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo 152-8551 Japan 3Department of Energy Sciences Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan

We measured the keV-neutron capture cross sections of 6Li, 16O, 20Ne, and 22Ne which are important parameters for studies on the primordial and/or stellar nucleosyntheses. The present measurement of the 6Li(n,γ)7Li reaction was the first one in the keV region. In the measurement of the 16O(n,γ)17O reaction, we succeeded in observing the interference between the 434-keV p-wave neutron resonance capture and the p-wave neutron potential capture. For the measurements of 20Ne and 22Ne, liquid samples were prepared and the p-wave neutron capture was observed.

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First measurement of neutron capture cross section of 6Li at stellar energy

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AIP Conference Proceedings 2000年第1期529卷 678-680页

作者： Toshiro Ohsaki Kenji Takaoka Yasuki Nagai Hideo Kitazawa Masayuki Igashira 1Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo 152-8550 Japan 2Department of Applied Physics Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo 152-8551 Japan 3Department of Energy Sciences Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama 226-8503 Japan

We measured the cross sections of the 6Li(n,γ)7Li reaction at the stellar energy for the first time. The measured cross sections were compared with potential model calculations with a folded potential, and good agreement was obtained. Moreover, the calculation with the same potential and a Coulomb potential also substantially reproduced the recently measured cross sections of the 6Li(p,γ)7Be reaction. It will support the charge symmetry of nuclear forces in A=7 systems.

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Performance of front-end readout system for PHENIX RICH 11

Performance of front-end readout system for PHENIX RICH

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11th IEEE NPSS Real Time Conference - Computer Applications in nuclear Particle and Plasma physics, RT 1999

作者： Oyama, K. Hamagaki, H. Nishimura, S. Shigaki, K. Hayano, R.S. Hibino, M. Kametani, S. Kikuchi, J. Matsumoto, T. Sakaguchi, T. Ebisu, K. Hara, H. Tanaka, Y. Ushiroda, T. Moscone, C.G. Wintenberg, A.L. Young, G.R. Center for Nuclear Study School of Science University of Tokyo 3-2-1 Midori-choy Tanashi Tokyo188-0002 Japan Physics Department School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-003 Japan Advanced Research Institute for Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Department of Electronics and Information Technology Graduate School of Engineering Nagasaki Institute of Applied Science Nagasaki851-0193 Japan Oak Ridge National Laboratory Oak RidgeTN37831-6006 United States

ISBN: (纸本)078035463X

A front-end electronics system have been developed for the ring imaging Cerenkov (RICH) detector of the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC), Brookhaven National Laboratory (BNL). A high speed custom back-plane with source synchronous bus architecture, a full custom analog ASIC, and board modules with FPGA's and CPLD's were developed for high performance real time data acquisition. The transfer rate of the back-plane has reached 640 MB/s with 128 bits data bus. Total transaction time is estimated to be less than 30 μs per event. The design specifications and test results of the system are presented in this paper. © 1999 IEEE.

关键词： Heavy ions

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