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9 results on '"A.G. Hansen"'

1. Deuteron and triton production with high energy sulphur and lead beams

Author

L. Conin, D. Ferenc, K. Kaimi, A. Ljubicic, Y. Sumi, M. Potekhin, J. Simon-Gillo, S. Esumi, T. Kohama, B. V. Jacak, P. Hummel, J. Dodd, J. Schmidt-Sørensen, M. Leltchouk, G. Paić, W. E. Sondheim, C.W. Fabjan, A.G. Hansen, L. Martin, Olfred Hansen, B. Lörstad, A. Medvedev, Gilbert Poulard, Toru Sugitate, B. Erazmus, W.J. Willis, H. Bøggild, F. Piuz, Ian Gardner Bearden, K.L. Wolf, J.J. Gaardhøje, A. Franz, Hiroaki Ohnishi, Daniel S. Zachary, S.U. Pandey, M. Kopytine, P.H.L. Christiansen, A. Sakaguchi, H. W. Van Hecke, Venetios Polychronakos, Michael D. Murray, J. P. Sullivan, J. Pluta, J. G. Boissevain, Masashi Kaneta, Nu Xu, E. B. Holzer, D. Hardtke, D. Reichhold, T. J. Humanic, Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics and Astronomy (miscellaneous), Nuclear Theory, Atomic, 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, Particle and Plasma Physics, 0103 physical sciences, Homogeneity (physics), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear, Rapidity, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Physics, Quantum Physics, Large Hadron Collider, 010308 nuclear & particles physics, Molecular, Nuclear & Particles Physics, Transverse plane, Deuterium, Transverse mass, Atomic physics, Nucleon
Abstract

Proton and deuteron production has been observed in S+S and S+Pb collisions at 200 A·GeV and in Pb+Pb reactions at 158 A·GeV at the CERN SPS accelerator. For Pb+Pb triton production was also measured. The p and d spectra as well as the p and t spectra were observed in similar rapidity ranges and over similar ranges of transverse momenta per nucleon, making it possible to interpret the cross sections of the composite particles in terms of coalescence mechanisms. Volumes of homogeneity were extracted and compared to pion-pair HBT interferometry results. Special attention is given to the dependence on transverse mass, centrality and rapidity.

Published
2002

2. One and two-dimensional analysis of 3π correlations measured in Pb+Pb interactions

Author

I.G. Bearden, H. Bøggild, J. Boissevain, P. Christiansen, L. Conin, J. Dodd, B. Erazmus, S. Esumi, C.W. Fabjan, D. Ferenc, D.E. Fields, A. Franz, J. Gaardhøje, A.G. Hansen, O. Hansen, D. Hardtke, H. van Hecke, E.B. Holzer, T.J. Humanic, P. Hummel, B.V. Jacak, R. Jayanti, K. Kaimi, M. Kaneta, T. Kohama, M. Kopytine, M. Leltchouk, A. Ljubičić, B. Lö, N. Maeda, L. Martin, A. Medvedev, M. Murray, H. Ohnishi, G. Paić, S.U. Pandey, F. Piuz, J. Pluta, V. Polychronakos, M. Potekhin, G. Poulard, D. Reichold, A. Sakaguchi, J. Schmidt-Sø, J. Simon-Gillo, W. Sondheim, T. Sugitate, J.P. Sullivan, Y. Sumi, W.J. Willis, K.L. Wolf, N. Xu, and D.S. Zachary

Subjects
Heavy-ion collisions, Physics, Nuclear and High Energy Physics, Three-particle correlations, Large Hadron Collider, 3-body, Spectrometer, Physics::Instrumentation and Detectors, FOS: Physical sciences, Extension (predicate logic), CERN SPS, Nuclear physics, Correlation function (statistical mechanics), Transverse plane, Interferometry, HBT, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract

$\pi^{-}\pi^{-}\pi^{-}$ correlations from Pb+Pb collisions at 158 GeV/c per nucleon are presented as measured by the focusing spectrometer of the NA44 experiment at CERN. The three-body effect is found to be stronger for PbPb than for SPb. The two-dimensional three-particle correlation function is also measured and the longitudinal extension of the source is larger than the transverse extension. 3pi- correlations from Pb+Pb collisions at 158 GeV/c per nucleon are presented as measured by the focusing spectrometer of the NA44 experiment at CERN. The three-body effect is found to be stronger for PbPb than for SPb. The two-dimensional three-particle correlation function is also measured and the longitudinal extension of the source is larger than the transverse extension.

Published
2001

3. Space-time evolution of the hadronic source in peripheral to central Pb+Pb collisions

Author

N. Maeda, A. Franz, Olfred Hansen, H. Bøggild, Daniel S. Zachary, Toru Sugitate, A. Medvedev, Y. Sumi, A.G. Hansen, J. Schmidt-Sørensen, J. P. Sullivan, P. Hummel, G. Paić, E. B. Holzer, D. Ferenc, J.J. Gaardhøje, B. Lörstad, T. J. Humanic, Hiroaki Ohnishi, Gilbert Poulard, J. Pluta, W.J. Willis, Ian Gardner Bearden, K. Kaimi, J. G. Boissevain, B. V. Jacak, Masashi Kaneta, S.U. Pandey, Nu Xu, M. Kopytine, D. Reichhold, K.L. Wolf, F. Piuz, A. Sakaguchi, M. Leltchouk, W. E. Sondheim, H. W. Van Hecke, J. Simon-Gillo, Venetios Polychronakos, L. Martin, A. Ljubicic, J. Dodd, B. Erazmus, M. Potekhin, T. Kohama, L. Conin, P.H.L. Christiansen, C.W. Fabjan, S. Esumi, M. Murray, and D. Hardtke

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Space time, Nuclear Theory, Hadron, Super Proton Synchrotron, Charged particle, Nuclear physics, Pion, Multiplicity (chemistry), Nuclear Experiment, Nucleon, Engineering (miscellaneous)
Abstract

Two-particle correlations of negative pions as a function of charged particle multiplicity are studied in Pb+Pb collisions at $\sqrt{s}=17.3$ GeV per nucleon using the NA44 experiment at the CERN Super Proton Synchrotron(SPS). We find that the source size parameters increase with the charged particle multiplicity. However the slope of the source size parameters plotted as a function of charged multiplicity is slightly larger at high multiplicity than at low multiplicity. The value of $\lambda$ is independent of charged multiplicity. For Pb+Pb collisions, $R_L$ is larger than $R_{TS}$ and $R_{TO}$ for all multiplicity intervals, whereas these three radius parameters were approximately equal in S+Nucleus collisions. The ratios ( $R_L/R_{TS}$ ) and ( $R_L/R_{TO}$ ) for Pb+Pb data show almost no dependence on charged multiplicity. The duration of pion emission $\Delta \tau$ is constant at 3.8 $\pm$ 1.1 fm/c as a function of the charged multiplicity in Pb+Pb collisions. Effective volume (V) is also calculated as V= $\pi\times R_{TS}^2\times R_L$ , assuming a cylindrically shaped source. We found, within the limited statistics, the effective volume rapidly increases at high multiplicity.

Published
2000

4. Deuteron and triton production in Pb+Pb collisions at 158 A·GeV

Author

J. Pluta, Allan G. Hansen, L. Martin, Y. Sumi, Ian Gardner Bearden, M. Kopytine, E. B. Holzer, J. P. Sullivan, M. Leltchouk, J. Schmidt-Sørensen, F. Piuz, W. E. Sondheim, Barbara Jacak, Gilbert Poulard, H. Van Hecke, J. Simon-Gillo, Hiroaki Ohnishi, Michael Murray, J. G. Boissevain, H. Bøggild, W.J. Willis, Masashi Kaneta, L. Conin, B. Lörstad, D. E. Fields, B. Erazmus, D. Reichhold, A. Ljubicic, Nu Xu, A. Medvedev, Toru Sugitate, S. Esumi, R. Malina, D. Ferenc, T. J. Humanic, A.G. Hansen, K. Kaimi, Guy Paic, C.W. Fabjan, D. Hardtke, J. Dodd, P. Hummel, M. Potekhin, T. Kohama, N. Maeda, A. Sakaguchi, S. U. Pandey, R. Jayanti, K.L. Wolf, A. Franz, Ole Hansen, Peter Christiansen, J. J. Gaardhøje, Venetios Polychronakos, and Daniel S. Zachary

Subjects
Physics, Coalescence (physics), Nuclear reaction, Nuclear and High Energy Physics, Nuclear Theory, Charged particle, Spectral line, Nuclear physics, Transverse plane, Deuterium, Mass spectrum, Transverse mass, Atomic physics, Nuclear Experiment
Abstract

NA44 has measured the invariant cross section of deuterons and tritons at non zero p t in 158 A·GeV lead on lead collisions at CERN SPS. Normalized transverse mass spectra and coalescence parameters versus p t have been calculated showing a significant transverse flow. Radius parameters have been extracted using a simple thermal coalescence model. Results from RQMD+coalescence calculations are compared to the data.

Published
1999

5. Kaon and proton ratios from central Pb+Pb collisions at the CERN SPS

Author

M. Kaneta, I.G. Bearden, H. Bøggild, J. Boissevain, J.R. Dodd, B. Erazmus, S. Esumi, C.W. Fabjan, D. Ferenc, D.E. Fields, A. Franz, J.J. Gaardhøje, M. Hamelin, A.G. Hansen, O. Hansen, D. Hardtke, H. van Hecke, E.B. Holzer, T. Humanic, P. Hummel, B.V. Jacak, R. Jayanti, K. Kaimi, M. Kopytine, M. Leltchouk, A. Ljubicic, B. Lørstad, N. Maeda, R. Malina, M. Murray, H. Ohnishi, G. Paic, S.U. Pandey, F. Piuz, J. Pluta, V. Polychronakos, M. Potekhin, G. Poulard, D. Reichhold, A. Sakaguchi, J. Schmidt-Sørensen, J. Simon-Gillo, W. Sondheim, M. Spegel, T. Sugitate, J.P. Sullivan, Y. Sumi, W.J. Willis, K.L. Wolf, N. Xu, and D.S. Zachary

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Strange quark, Large Hadron Collider, Proton, Transverse momentum, Hadron, Transverse mass, Central region
Abstract

K−/K+ and p ¯ / p ratios measured in 158 A·GeV Pb+Pb collisions are shown as a function of transverse momentum PT and centrality in top 8.5% central region. Little centrality dependence of the K−/K+ and p ¯ / p ratios is observed. The transverse mass mT distribution and dN/dy of K+, K−, p and p ¯ around mid-rapidity are obtained. The temperature Tch and the chemical potentials for both light and strange quarks (μq, μs) at chemical freeze-out are determined by applying simple thermodynamical model to the present data. The resultant μq, μs and Tch are compared with those obtained from similar analysis of SPS S+A and AGS Si+A data. The chemical freeze-out temperature Tch at CERN energies is higher than thermal freeze-out temperature Tfo which is extracted from mT distribution of charged hadrons. At AGS energies Tch is close to Tfo.

Published
1998

6. One-, two- and three-particle hadron spectra — Recent results from CERN/SPS experiment NA44

Author

W. Sondheim, V. Polychronakos, M. Leltchouk, J. Dodd, E.B. Holzer, B.V. Jacak, Y. Sumi, D. Reichhold, B. Lörstad, F. Pinz, C.W. Fabjan, J. Pluta, T. J. Humanic, J.J. Gaardhøje, J. Boissevain, A. Ljubicic, A. Sakaguchi, W.J. Willis, Daniel S. Zachary, T. Sugitate, S. Esumi, M. Murray, D. Hardtke, H. Ohnishi, M. Potekhin, G. Poulard, P. Hummel, I.G. Bearden, A.G. Hansen, T. Kohama, D.E. Fields, Masashi Kaneta, J.P. Sullivan, R. Malina, A. Medvedev, M. Spegel, N. Xu, R. Jayanti, N. Maeda, S.U. Pandey, J. Simon-Gillo, K. Kaimi, H. W. Van Hecke, O. Hansen, M. Kopytine, H. Bøggild, B. Erazmus, K.L. Wolf, A. Franz, D. Ferenc, J. Schmidt-Sørensen, Guy Paic, and S. Nishimura

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Interferometry, Large Hadron Collider, Deuterium, Spectrometer, Nuclear Theory, Hadron, Transverse mass, Multiplicity (chemistry), Nuclear Experiment, Spectral line
Abstract

Recent results of analyses on hadron spectra from the focusing spectrometer experiment NA44 are presented. One-, two- and three-particle hadron spectra in the mid-rapidity region at CERN/SPS energy have been measured. The mT inverse-slopes of proton and anti-proton in collision systems from p+A to Pb+Pb are discussed. Spectra of deuteron, triton and anti-deuteron are presented, and the flow effect on the composite particle spectra are discussed. The two-particle interferometry analysis is made for the π±π± and K+K+ correlations in the central Pb+Pb collisions, and the dependences of interferometric parameters on the transverse mass and the multiplicity are discussed.

Published
1998

7. Reliability and maintainability in computer-aided engineering

Author

A.G. Hansen

Subjects
Engineering, Concurrent engineering, business.industry, Maintainability, Systems engineering, Solid modelling, CAD, Computer-aided engineering, business, Reliability assurance, Maintenance engineering, Manufacturing engineering, Reliability (statistics)
Abstract

The author relates his experience of working as Deputy Commander Maintenance in Lockheed Aeronautical Systems Company, particularly with the Hercules C-130 airplane. He discusses the use of computer aids for maintenance and reliability assurance, including concurrent engineering, CAD/CAM and solid modelling. >

Published
2003

8. Centrality Dependence of the High p_T Charged Hadron Suppression in Au+Au collisions at sqrt(s_NN) = 130 GeV

Author

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. Kara, 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. Muniruzzaman, J. Murata, S. Nagamiya, Y. Nagasaka, J.L. Nagle, Y. Nakada, B.K. Nandi, J. Newby, L. Nikkinen, P. Nilsson, S. Nishimura, A.S. Nyanin, J. Nystrand, E. O'Brien, C.A. Ogilvie, H. Ohnishi, I.D. Ojha, M. Ono, V. Onuchin, A. Oskarsson, L. Österman, I. Otterlund, K. Oyama, L. Paffrath, A.P.T. Palounek, V.S. Pantuev, V. Papavassiliou, S.F. Pate, T. Peitzmann, A.N. Petridis, C. Pinkenburg, R.P. Pisani, P. Pitukhin, F. Plasil, M. Pollack, K. Pope, M.L. Purschke, I. Ravinovich, K.F. Read, K. Reygers, V. Riabov, Y. Riabov, M. Rosati, A.A. Rose, S.S. Ryu, N. Saito, A. Sakaguchi, T. Sakaguchi, H. Sako, T. Sakuma, V. Samsonov, T.C. Sangster, R. Santo, H.D. Sato, S. Sato, S. Sawada, B.R. Schlei, Y. Schutz, V. Semenov, R. Seto, T.K. Shea, I. Shein, T.-A. Shibata, K. Shigaki, T. Shiina, Y.H. Shin, I.G. Sibiriak, D. Silvermyr, K.S. Sim, J. Simon-Gillo, C.P. Singh, V. Singh, M. Sivertz, A. Soldatov, R.A. Soltz, S. Sorensen, P.W. Stankus, N. Starinsky, P. Steinberg, E. Stenlund, A. Ster, S.P. Stoll, M. Sugioka, T. Sugitate, J.P. Sullivan, Y. Sumi, Z. Sun, M. Suzuki, E.M. Takagui, A. Taketani, M. Tamai, K.H. Tanaka, Y. Tanaka, E. Taniguchi, M.J. Tannenbaum, J. Thomas, J.H. Thomas, T.L. Thomas, W. Tian, J. Tojo, H. Torii, R.S. Towell, I. Tserruya, H. Tsuruoka, A.A. Tsvetkov, S.K. Tuli, H. Tydesjö, N. Tyurin, T. Ushiroda, H.W. van Hecke, C. Velissaris, J. Velkovska, M. Velkovsky, A.A. Vinogradov, A.M. Volkov, A. Vorobyov, E. Vznuzdaev, H. Wang, Y. Watanabe, S.N. White, C. Witzig, F.K. Wohn, C.L. Woody, W. Xie, K. Yagi, S. Yokkaichi, G.R. Young, I.E. Yushmanov, W.A. Zajc, Z. Zhang, S. Zhou, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and PHENIX

Subjects
Physics, Nuclear and High Energy Physics, Energy loss, 010308 nuclear & particles physics, Scattering, Hadron, FOS: Physical sciences, Parton, 01 natural sciences, Spectral line, Nuclear physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Centrality, Nucleon, Nuclear Experiment, Scaling
Abstract

PHENIX has measured the centrality dependence of charged hadron p_T spectra from central Au+Au collisions at sqrt(s_NN)=130 GeV. The truncated mean p_T decreases with centrality for p_T > 2 GeV/c, indicating an apparent reduction of the contribution from hard scattering to high p_T hadron production. For central collisions the yield at high p_T is shown to be suppressed compared to binary nucleon-nucleon collision scaling of p+p data. This suppression is monotonically increasing with centrality, but most of the change occurs below 30% centrality, i.e. for collisions with less than about 140 participating nucleons. The observed p_T and centrality dependence is consistent with the particle production predicted by models including hard scattering and subsequent energy loss of the scattered partons in the dense matter created in the collisions., 7 pages text, LaTeX, 6 figures, 2 tables, 307 authors, resubmitted to Phys. Lett. B. Revised to address referee concerns. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are publicly available at http://www.phenix.bnl.gov/phenix/WWW/run/phenix/papers.html

Published
2002
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9. Strange Meson Enhancement in PbPb Collisions

Author

F. Piuz, A.G. Hansen, S. Esumi, Ian Gardner Bearden, D. Ferenc, J. Dodd, T. J. Humanic, Hiroaki Ohnishi, Y. Sumi, M. Kopytine, Venetios Polychronakos, K.L. Wolf, J. Schmidt-Sørensen, E. B. Holzer, P. Hummel, Olfred Hansen, R. Jayanti, B. Lörstad, Gilbert Poulard, A. Medvedev, A. Franz, J. Pluta, Aya Sakaguchi, D. E. Fields, N. Maeda, B. V. Jacak, G. Paić, W.J. Willis, D. Hardtke, S.U. Pandey, D. Reichhold, Daniel S. Zachary, H. W. Van Hecke, M. Potekhin, Toru Sugitate, T. Kohama, Michael D. Murray, B. Erazmus, L. Martin, A. Ljubicic, M. Leltchouk, W. E. Sondheim, J. Simon-Gillo, K. Kaimi, H. Bøggild, J.J. Gaardhøje, J. P. Sullivan, C.W. Fabjan, J. G. Boissevain, Masashi Kaneta, L. Conin, and Nu Xu

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, Hadron, Nuclear Theory, Strangeness production, FOS: Physical sciences, Kinetic energy, Nuclear physics, Pion, Quark–gluon plasma, Nuclear Physics - Experiment, Rapidity, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The NA44 Collaboration has measured yields and differential distributions of K+, K-, pi+, pi- in transverse kinetic energy and rapidity, around the center-of-mass rapidity in 158 A GeV/c Pb+Pb collisions at the CERN SPS. A considerable enhancement of K+ production per pi is observed, as compared to p+p collisions at this energy. To illustrate the importance of secondary hadron rescattering as an enhancement mechanism, we compare strangeness production at the SPS and AGS with predictions of the transport model RQMD., Comment: 11 pages, including 4 figures, LATEX

Published
1999
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