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1. A prototype HBD for PHENIX

Author

T. Vongpaseuth, S. C. Johnson, H. Chung, M. Akopyan, T. Piazza, T. K. Hemmick, and R.P. Pisani

Subjects
Physics, Nuclear and High Energy Physics, Wire chamber, Physics::Instrumentation and Detectors, Cherenkov detector, Detector, Photocathode, law.invention, Nuclear physics, Pion, law, Radiator (engine cooling), Electron efficiency, Instrumentation
Abstract

We constructed and tested a threshold Cherenkov detector (inspired by the conceptual design of Giomataris and Charpak (Nucl. Instr. and Meth. A 310 (1991) 589 ) consisting of a gas radiator followed by a photosensitive wire chamber using a solid CsI photocathode. The detector was operated with C2F6 radiator gas and a 95%He+5%CH4 mixture for the avalanche gas. At 95% electron efficiency, the pion efficiency was 1 333 , 1 150 , and 1 100 for each of the lengths listed above.

Published
1999
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2. Directed flow of light nuclei in Au+Au collisions at 10.8AGeV/c

Author

J. R. Hall, R. Lacasse, N. Herrmann, M. W. Drigert, M. Clemen, W. C. Chang, E. O'Brien, N. C. daSilva, T. Piazza, Y. Dai, G. David, S. Bennett, Y. Kwon, R. Bersch, M. Rosati, R. Matheus, Claude Andre Pruneau, N. Xu, Peter Braun-Munzinger, J. Barrette, C. L. Woody, Johannes Peter Wessels, W. E. Cleland, R. Bellwied, Upul Sonnadara, Q. Li, O. Dietzsch, Edward L. Reber, J. Dee, S. C. Johnson, S. Sedykh, G. Wang, T. K. Hemmick, J. D. Cole, E. M. Takagui, P. Paul, M. N. Rao, D. Miśkowiec, B. Hong, S. Panitkin, K. Filimonov, T. Vongpaseuth, Johanna Stachel, J. T. Murgatroyd, S. Voloshin, Thomas Michael Cormier, S. McCorkle, M. Pollack, S. K. Mark, C. Zou, T. W. Ludlam, and Y. Zhang

Subjects
Physics, Nuclear and High Energy Physics, Light nucleus, 010308 nuclear & particles physics, Nuclear Theory, Elliptic flow, 01 natural sciences, Nuclear physics, Momentum, Deuterium, Flow (mathematics), 0103 physical sciences, Rapidity, Atomic physics, Nuclear Experiment, 010306 general physics, Anisotropy, Beam (structure)
Abstract

Directed flow of deuterons, tritons, ${}^{3}\mathrm{He},$ and ${}^{4}\mathrm{He}$ is studied in Au+Au collisions at a beam momentum of $10.8A\mathrm{GeV}/c.$ Flow of all particles is analyzed as a function of transverse momentum for different centralities of the collision. The directed flow signal, ${v}_{1}{(p}_{t}),$ is found to increase with particle mass. This mass dependence is strongest in the projectile rapidity region.

Published
1999
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3. Particle production and hydrodynamic flow: Recent results from E877 for Au+Au colliaions at AGS energy

Author

K. Filimonov, N. Starinsky, R. Matheus, Peter Braun-Munzinger, S. Voloshin, J. R. Hall, N. Herrmann, Q. Li, R. Bellwied, S. Johnson, Y. Zhang, M. W. Drigert, S. K. Mark, M. Rosati, T.K. Hemmick, B. Hong, J. Dee, S. I. Esumi, E. M. Takagui, S. Panitkin, T. W. Ludlam, S. Sedykh, Johannes Peter Wessels, P. Paul, C. L. Woody, R. Lacasse, J. D. Cole, J. Sheen, T. Vongpaseuth, J.P. Wessels, A. French, Johanna Stachel, C. Zou, J. T. Murgatroyd, W. E. Cleland, M. Trzaska, M. Clemen, Upul Sonnadara, N. Xu, Claude Andre Pruneau, Thomas Michael Cormier, W.C. Chang, N. C. daSilva, S. McCorkle, Y. Dai, Edward L. Reber, V. Pantuev, E. O'Brien, D. Miśkowiec, S. Bennett, Yujin Qi, J. Barrette, R. Bersch, T. Piazza, G. Wang, G. David, Y. Kwon, M. Pollack, and O. Dietzsch

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Hadron, Particle, Particle flow, Rapidity, Nuclear Experiment, Hydrodynamic flow
Abstract

In this article recent results of the E877 collaboration are presented. They include double differential multiplicities and rapidity densities of hadrons produced in Au+Au collisions at 11 AgeV/c, two-particle correlations of like and unlike particles, as well as some recent results on particle flow.

Published
1998
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4. Successful test of a prototype hadron blind detector

Author

S. C. Johnson, M. Akopyan, T. Vongpaseuth, T. Piazza, R.P. Pisani, T. K. Hemmick, and H. Chung

Subjects
Physics, Nuclear and High Energy Physics, Wire chamber, Physics::Instrumentation and Detectors, Cherenkov detector, business.industry, Detector, Charged particle, Photocathode, law.invention, Optics, law, Carbon–fluorine bond, Radiator (engine cooling), business, Instrumentation, Sensitivity (electronics)
Abstract

We have constructed and tested a threshold Cherenkov detector inspired by the conceptual design of Giomataris and Charpak (Nucl. Instr. and Meth. A 310 (1991) 589). The basic design consists of a gas radiator followed by a photosensitive wire chamber using a solid Csl photocathode. The photon detector lies directly in the particle path and is required to have single photo-electron sensitivity and yet be insensitive to the passage of a charged particle. We have altered the design by adding a thin LiF window. This window allows one to separate the radiator and avalanche volumes, giving greater flexibility in the gas choices. Our detector was operated with C2F6 as the radiator gas at lengths of 120, 80, and 40 cm. The avalanche gas was 95%He + 5% CH4. At 95% electron efficiency, the pion efficiency was 1333, 1150, and 1100 for each of the lengths listed above.

Published
1997
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5. Proton and pion production relative to the reaction plane in Au + Au collisions at 11AGeV/c

Author

K. Filimonov, S. C. Johnson, M. Clemen, J. R. Hall, R. Bersch, M. Rosati, Claude Andre Pruneau, Thomas Michael Cormier, D. Miśkowiec, Edward L. Reber, S. McCorkle, W. C. Chang, Y. Dai, G. David, S. Panitkin, N. Herrmann, M. Drigert, Johannes Peter Wessels, J. Dee, S. Sedykh, W. E. Cleland, J. Barrette, Johanna Stachel, C. L. Woody, N. Xu, J. T. Murgatroyd, E. M. Takagui, G. Wang, T. K. Hemmick, Y. Kwon, S. K. Mark, O. Dietzsch, B. Hong, Upul Sonnadara, R. Matheus, Peter Braun-Munzinger, M. N. Rao, S. Voloshin, R. Bellwied, S. Bennett, J. D. Cole, T. Vongpaseuth, N. C. da Silva, E. O'Brien, T. W. Ludlam, Yi Zhang, C. Zou, Q. Li, T. Piazza, R. Lacasse, and M. Pollack

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, 01 natural sciences, Charged particle, Azimuth, Nuclear physics, Transverse plane, Pion, Energy flow, 0103 physical sciences, Rapidity, Atomic physics, Nuclear Experiment, 010306 general physics, Anisotropy
Abstract

Results are presented of an analysis of proton and charged pion azimuthal distributions measured with respect to the reaction plane in Au + Au collisions at a beam momentum of about 11A GeV/c. The azimuthal anisotropy is studied as a function of particle rapidity and transverse momentum for different centralities of the collisions. The triple differential (in rapidity, transverse momentum, and azimuthal angle) distributions are reconstructed. A comparison of the results with a previous analysis of charged-particle and transverse energy flow as well as with model predictions are presented. {copyright} {ital 1997} {ital The American Physical Society}

Published
1997
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6. Two-particle correlations in Au+Au collisions at AGS energy

Author

Q. Li, T. W. Ludlam, D. Gan, K. Filimonov, Yi Zhang, W. E. Cleland, D. Miśkowiec, O. Dietzsch, E. M. Takagui, Y. Kwon, T. Vongpaseuth, Z. Zhang, B. Hong, R. Matheus, E. O'Brien, Peter Braun-Munzinger, Upul Sonnadara, M. Clemen, M. Trzaska, S. C. Johnson, T. Piazza, N. Starinski, R. Bellwied, S. Bennett, S. Panitkin, C. Zou, Yujin Qi, W. C. Chang, A. Lukaszew, Thomas Michael Cormier, G. Wang, N. Xu, S. Voloshin, S. McCorkle, T. K. Hemmick, J. T. Murgatroyd, R. Lacasse, G. David, M. Pollack, Y. Dai, S. Gilbert, Claude Andre Pruneau, Johanna Stachel, P. Paul, J. Barrette, N. C. daSilva, C. L. Woody, C. L. Jiang, J. D. Cole, S. K. Mark, N. Herrmann, R. Bersch, M. Rosati, M. N. Rao, J. Dee, J. R. Hall, S. Sedykh, J. P. Wessels, and M. W. Drigert

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pion, High Energy Physics::Lattice, Phase space, Nuclear Theory, Particle, High Energy Physics::Experiment, Nuclear Experiment, Energy (signal processing)
Abstract

Two-particle correlation functions have been measured in Au+Au collisions at the AGS. The one-dimensional correlations are compared to the RQMD predictions. A multidimensional analysis of two-pion correlations allows to extract the average phase space density of pions at freeze-out and the pion source velocity.

Published
1996
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7. Directed flow and particle production in Au+Au collisions from experiment E877 at the AGS

Author

Johanna Stachel, Y. Kwon, S. Bennett, S. Panitkin, J. R. Hall, J. P. Wessels, M. Clemen, T. Vongpaseuth, J. T. Murgatroyd, C. L. Woody, N. C. da Silva, Thomas Michael Cormier, M. Pollack, W. C. Chang, T. Piazza, Claude Andre Pruneau, B. Hong, N. Starinsky, Yi Zhang, Y. Dai, R. Matheus, Peter Braun-Munzinger, D. Miśkowiec, O. Dietzsch, M. Drigert, R. Bersch, M. Rosati, J. Barrette, S. Sedykh, Q. Li, R. Bellwied, J. Dee, G. David, C. Zou, E. O'Brien, N. Xu, G. Wang, T. K. Hemmick, S. McCorkle, W. E. Cleland, R. Lacasse, E. M. Takagui, N. Herrmann, Upul Sonnadara, S. C. Johnson, A. Lukaszew, S. Voloshin, S. K. Mark, J. D. Cole, M. N. Rao, and T. W. Ludlam

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Flow (mathematics), Particle, Atomic physics
Published
1995
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8. Λproduction and flow in Au+Au collisions at11.5AGeV/c

Author

G. David, N. Xu, V. S. Pantuev, P. Paul, M. Pollack, J. R. Hall, R. Matheus, Peter Braun-Munzinger, O. Dietzsch, J. D. Cole, Y. Dai, M. W. Drigert, R. Bellwied, C. L. Woody, E. O'Brien, C. Zou, T. Vongpaseuth, J. Dee, Q. Li, M. Trzaska, S. Sedykh, D. Miśkowiec, Upul Sonnadara, S. C. Johnson, S. Bennett, V. Topor Pop, G. Wang, T. K. Hemmick, Claude Andre Pruneau, Thomas Michael Cormier, S. Panitkin, S. K. Mark, M. Clemen, Yujin Qi, S. McCorkle, W. E. Cleland, M. N. Rao, N. C. daSilva, Y. Kwon, Johanna Stachel, J. T. Murgatroyd, Y. Zhang, Edward L. Reber, B. Hong, J. Barrette, N. Herrmann, T. W. Ludlam, E. M. Takagui, K. Filimonov, W. C. Chang, R. Bersch, M. Rosati, Johannes Peter Wessels, T. Piazza, S. Voloshin, and R. Lacasse

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Angular distribution, Flow (mathematics), Particle flow
Published
2000
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9. Light fragment yields from central Au+Au collisions at11.5A GeV/c

Author

S. Bennett, O. Dietzsch, Yujin Qi, S. Panitkin, Claude Andre Pruneau, Johanna Stachel, J. Sheen, M. N. Rao, D. Miśkowiec, Z. Zhang, R. Matheus, Peter Braun-Munzinger, S. K. Mark, R. Bersch, M. Rosati, N. Herrmann, B. Hong, Helio Takai, C. Zou, T. Vongpaseuth, R. Bellwied, E. O'Brien, K. Filimonov, S. Voloshin, Thomas Michael Cormier, T. Piazza, C. L. Jiang, J. D. Cole, S. McCorkle, Johannes Peter Wessels, N. C. daSilva, Edward L. Reber, J. Dee, S. Sedykh, E. M. Takagui, M. Clemen, W. E. Cleland, Y. Kwon, Y. Dai, M. Pollack, W. C. Chang, T. W. Ludlam, Upul Sonnadara, C. L. Woody, R. Lacasse, S. C. Johnson, Y. Zhang, Q. Li, J. R. Hall, M. W. Drigert, T. K. Hemmick, G. David, N. Xu, and J. Barrette

Subjects
Coalescence (physics), Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Alternating Gradient Synchrotron, 7. Clean energy, 01 natural sciences, Nuclear physics, Helium-4, Deuterium, Helium-3, 0103 physical sciences, Rapidity, Atomic physics, Impact parameter, Nuclear Experiment, 010306 general physics
Abstract

Inclusive double differential multiplicities of deuterons, {sup 3}H, {sup 3}He, and {sup 4}He measured by E877 for 11.5A GeV/c Au+Au collisions at the Brookhaven's Alternating Gradient Synchrotron (AGS) are presented. Light fragments at beam rapidity are measured for the first time at AGS energies. Beam rapidity deuteron and {sup 4}He yields and transverse slope parameters are found to be strongly dependent on the impact parameter, and the shape of the deuteron spectra is not consistent with that expected for a simple thermal distribution. The deuteron yields relative to proton yields are analyzed in terms of a simple coalescence model. While results indicate an increase in source size compared to collisions of lighter systems at the same energy, they are inconsistent with a simple coalescence model reflected by a rapidity dependence of the coalescence parameter B{sub d}. A new approach utilizing an expanding thermalized source combined with a coalescence code is developed for studying deuteron formation in heavy-ion collisions. The strong dependence of deuteron yields on collective motion implies that deuteron yields relative to those of protons can be used for constraining source parameters. (c) 2000 The American Physical Society.

Published
2000
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10. Directed flow of antiprotons in Au+Au collisions at AGS

Author

R. Bersch, M. Rosati, E. O'Brien, S. I. Esumi, Y. Dai, Johanna Stachel, M. Pollack, R. Lacasse, N. Herrmann, Johannes Peter Wessels, J. Barrette, Nu Xu, S. Panitkin, G. Wang, S. Voloshin, M. Drigert, P. Paul, E. M. Takagui, P. Braun-Munzinger, A. French, Thomas Michael Cormier, J. D. Cole, M. Trzaska, M. Clemen, S. McCorkle, T.K. Hemmick, C. L. Woody, C. Zou, T. Vongpaseuth, Edward L. Reber, S. C. Johnson, V. S. Pantuev, K. Filimonov, W. C. Chang, Dariusz Czeslaw Miskowiec, Yujin Qi, T. Piazza, T. W. Ludlam, N. Starinski, O. Dietzsch, Claude Andre Pruneau, Q. Li, Yi Zhang, J. Dee, S. Sedykh, V. Topor Pop, Y. Kwon, R. Bellwied, J. Sheen, W. E. Cleland, B. Hong, Upul Sonnadara, G. David, S. J. Bennett, S. K. Mark, and J. R. Hall

Subjects
Physics, Nuclear and High Energy Physics, Proton, FOS: Physical sciences, 7. Clean energy, Momentum, Nuclear physics, Physics::Fluid Dynamics, Flow (mathematics), Antiproton, Transverse momentum, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure), Event generator
Abstract

Directed flow of antiprotons is studied in Au+Au collisions at a beam momentum of 11.5A GeV/c. It is shown that antiproton directed flow is anti-correlated to proton flow. The measured transverse momentum dependence of the antiproton flow is compared with predictions of the RQMD event generator., Comment: 16 pages, 6 figures

Published
2000
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11. Two-proton correlations from 14.6AGeV/cSi+Pb and 11.5AGeV/cAu+Au central collisions

Author

M. Clemen, R. Lacasse, S. Voloshin, R. Matheus, S. C. Johnson, Peter Braun-Munzinger, W. C. Chang, R. Bellwied, Y. Kwon, R. Bersch, M. Rosati, D. Miśkowiec, T. W. Ludlam, Claude Andre Pruneau, Z. Zhang, J. R. Hall, E. O'Brien, Johannes Peter Wessels, T. Piazza, C. Zou, G. David, N. Xu, M. W. Drigert, M. Pollack, C. L. Woody, S. Gilbert, S. K. Mark, S. Bennett, G. Wang, T. K. Hemmick, Q. Li, T. Vongpaseuth, Edward L. Reber, J. Sheen, S. Panitkin, Y. Zhang, J. Dee, C. L. Jiang, S. Sedykh, J. D. Cole, N. C. daSilva, Thomas Michael Cormier, S. McCorkle, W. E. Cleland, N. Herrmann, Johanna Stachel, J. T. Murgatroyd, O. Dietzsch, Y. Dai, Helio Takai, V. S. Pantuev, Upul Sonnadara, J. Barrette, K. Filimonov, M. N. Rao, B. Hong, and E. M. Takagui

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Projectile, Nuclear Theory, Transport theory, 01 natural sciences, Nuclear physics, Correlation function (statistical mechanics), 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

Two-proton correlation functions have been measured in Si+Pb collisions at 14.6A GeV/c and Au+Au collisions at 11.5A GeV/c by the E814/E877 collaboration. Data are compared with predictions of the transport model RQMD and the source size is inferred from this comparison. Our analysis shows that, for both reactions, the characteristic size of the system at freeze-out exceeds the size of the projectile, suggesting that the fireball created in the collision has expanded. For Au+Au reactions, the observed centrality dependence of the two-proton correlation function implies that more central collisions lead to a larger source sizes., Comment: RevTex, 12 pages, 5 figures

Published
1999
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12. Proton and Pion Production in Au+Au Collisions at 10.8A GeV/c

Author

R. Bersch, M. Rosati, S. K. Mark, S. Bennett, Johannes Peter Wessels, K. Filimonov, G. Wang, T. K. Hemmick, Yujin Qi, S. C. Johnson, W. E. Cleland, J. Barrette, S. Panitkin, G. David, Johanna Stachel, T. Vongpaseuth, D. Miśkowiec, J. T. Murgatroyd, N. Xu, E. O'Brien, N. Herrmann, J. R. Hall, E. M. Takagui, T. Piazza, M. N. Rao, Edward L. Reber, P. Paul, B. Hong, M. W. Drigert, R. Lacasse, Claude Andre Pruneau, M. Clemen, C. L. Woody, N. C. daSilva, O. Dietzsch, Upul Sonnadara, Q. Li, Y. Dai, J. Dee, S. Sedykh, T. W. Ludlam, V. Topor Pop, W. C. Chang, Thomas Michael Cormier, Y. Kwon, S. McCorkle, C. Zou, R. Matheus, Peter Braun-Munzinger, Y. Zhang, R. Bellwied, M. Pollack, S. Voloshin, and J. D. Cole

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, FOS: Physical sciences, Nuclear matter, 01 natural sciences, 7. Clean energy, Spectral line, Nuclear physics, Momentum, Pion, 0103 physical sciences, Coulomb, Rapidity, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Event generator
Abstract

We present proton and pion tranverse momentum spectra and rapidity distributions for Au+Au collisions at 10.8A GeV/c. The proton spectra exhibit collective transverse flow effects. Evidence of the influence of the Coulomb interaction from the fireball is found in the pion transverse momentum spectra. The data are compared with the predictions of the RQMD event generator., Comment: plain tex (revtex), 24 pages Submitted to Phys. Rev. C

Published
1999
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13. Polyurethane foams: effects of specimen size when determining cushioning stiffness

Author

B A, Todd, S L, Smith, and T, Vongpaseuth

Subjects
Orthotic Devices, Compressive Strength, Materials Testing, Polyurethanes, Humans, Prostheses and Implants, Elasticity
Abstract

Polyurethane (PU) foams are used as inexpensive materials for reducing interface pressure in a number of rehabilitative applications, particularly seating and prosthetic limb interfaces. Specimens of three different PU foams were cut to four different sizes and compressed according to ASTM protocols to determine their stiffness capabilities. It was found that the test results varied according to the relationship between the size of the test specimen and the test indenter. It is recommended that investigators create a testing situation that reflects their application when determining the cushioning capabilities of these materials.

Published
1998

14. Flow in Ultrarelativistic Heavy Ion Collisions at the AGS

Author

P. Paul, T. Piazza, M. Clemen, Edward L. Reber, S. K. Mark, W. C. Chang, N. Xu, R. Lacasse, T. Vongpaseuth, S. Panitkin, Z. Zhang, M. N. Rao, Helio Takai, S. C. Johnson, N. Starinski, E. O'Brien, R. Matheus, A. French, R. Bersch, M. Rosati, M. Pollack, J. T. Murgatroyd, Claude Andre Pruneau, Peter Braun-Munzinger, G. David, B. Hong, S. Gilbert, C. Zou, Thomas Michael Cormier, M. Trzaska, N. Herrmann, Johanna Stachel, D. Miśkowiec, O. Dietzsch, R. Bellwied, K. Filimonov, S. McCorkle, S. Bennett, Yujin Qi, A. Lukaszew, J. Dee, S. Sedykh, J. D. Cole, G. Wang, T. K. Hemmick, J. Sheen, Y. Zhang, K. Jayananda, E. M. Takagui, Y. Kwon, N. C. daSilva, T. W. Ludlam, C. L. Woody, Upul Sonnadara, Q. Li, J. R. Hall, J. P. Wessels, M. W. Drigert, W. E. Cleland, Y. Dai, S. Voloshin, and J. Barrette

Subjects
Physics, Spectrometer, Plane (geometry), Nuclear Theory, Spectral line, Nuclear physics, Transverse plane, symbols.namesake, Pion, Fourier analysis, Pseudorapidity, symbols, Nuclear Experiment, Nucleon
Abstract

The azimuthal distributions of produced transverse energy from the reaction Au + Au at 10.8 AGeV/c have been studied with the nearly 4π calorimetric coverage of the E877-setup at the AGS. A Fourier analysis of these distributions has been performed in different regions of pseudorapidity as a function of centrality. The extracted sideward flow is found to be maximal in semi-central collisions. This analysis has also been employed to extract the orientation of the reaction plane. Spectra of particles identified in the forward spectrometer are then analyzed with respect to the reaction plane and their triple differential cross sections are determined. The nucleons are found to be the carriers of the sideward flow identified in the calorimeters. While the pions are also preferentially emitted into the reaction plane they show a slight tendency for emission to the opposite side of where the nucleons are found.

Published
1996
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15. Hadron yields and spectra in Au+Au collisions at the AGS

Author

Roger Lacasse, J. Barrette, R. Bellwied, S. Bennett, R. Bersch, P. Braun-Munzinger, W.C. Chang, W.E. Cleland, M. Clemen, J.D. Cole, T.M. Cormier, Y. Dai, G. David, J. Dee, O. Dietzsch, M.W. Drigert, K. Filimonov, J.R. Hall, T.K. Hemmick, N. Herrmann, B. Hong, C.L. Jiang, S.C. Johnson, Y. Kwon, R. Lacasse, A. Lukaszew, Q. Li, T.W. Ludlam, S. McCorkle, S.K. Mark, R. Matheus, D. Miśkowiec, J. Murgatroyd, E. O'Brien, S. Panitkin, T. Paul, T. Piazza, M. Pollack, C. Pruneau, Y. Qi, M.N. Rao, M. Rosati, N.C. daSilva, S. Sedykh, U. Sonnadara, J. Stachel, N. Starinski, E.M. Takagui, M. Trzaska, S. Voloshin, T. Vongpaseuth, G. Wang, J.P. Wessels, C.L. Woody, N. Xu, Y. Zhang, Z. Zhang, and C. Zou

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, FOS: Physical sciences, 01 natural sciences, Spectral line, Nuclear physics, Transverse plane, Flow (mathematics), 0103 physical sciences, Rapidity, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Differential (mathematics)
Abstract

Inclusive double differential multiplicities and rapidity density distributions of hadrons are presented for 10.8 A GeV/c Au+Au collisions as measured at the AGS by the E877 collaboration. The results indicate that large amounts of stopping and collective transverse flow effects are present. The data are also compared to the results from the lighter Si+Al system., Comment: 12 pages, latex, 10 figures, submitted to Nuclear Physics A (Quark Matter 1996 Proceedings)

Published
1996
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16. Flow studies at 10.8 GeV/nucleon

Author

T.K. Hemmick, J. Barrette, R. Bellwied, S. Bennett, R. Bersch, P. Braun-Munzinger, W.C. Chang, W.E. Cleland, M. Clemen, J.D. Cole, T.M. Cormier, Y. Dai, G. David, J. Dee, O. Dietzsch, M.W. Drigert, K. Filimonov, J.R. Hall, N. Herrmann, B. Hong, C.L. Jiang, S.C. Johnson, Y. Kwon, R. Lacasse, A. Lukaszew, Q. Li, T.W. Ludlam, S.K. Mark, S. McCorkle, R. Matheus, D. Miśkowiec, J.T. Murgatroyd, E. O'Brien, S. Panitkin, T. Piazza, M. Pollack, C. Pruneau, Y. Qi, M.N. Rao, M. Rosati, N.C. daSilva, S. Sedykh, U. Sonnadara, J. Stachel, N. Starinsky, E.M. Takagui, M. Trzaska, S.A. Voloshin, T. Vongpaseuth, G. Wang, J.P. Wessels, C.L. Woody, N. Xu, Y. Zhang, Z. Zhang, and C. Zou

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Charged particle, Nuclear physics, symbols.namesake, Transverse plane, Pion, Fourier analysis, symbols, Rapidity, Multiplicity (chemistry), Nuclear Experiment, Nucleon, Anisotropy
Abstract

We present the present status of the E877 studies of anisotropic transverse flow at the AGS energy. Flow is quantified by Fourier analysis of the azimuthal distributions of transverse energy and charged particle multiplicity. Additionally, the mean transverse momentum of identified particle spectra with respect to the reaction plane are measured near the beam rapidity. Analysis shows the presence of nucleon flow at AGS energies and a small pion flow in the direction opposite to that of the nucleon.

17. Polyurethane foams: effects of specimen size when determining cushioning stiffness.

Author

Todd BA, Smith SL, and Vongpaseuth T

Subjects
Compressive Strength, Elasticity, Humans, Materials Testing, Orthotic Devices, Prostheses and Implants, Polyurethanes
Abstract

Polyurethane (PU) foams are used as inexpensive materials for reducing interface pressure in a number of rehabilitative applications, particularly seating and prosthetic limb interfaces. Specimens of three different PU foams were cut to four different sizes and compressed according to ASTM protocols to determine their stiffness capabilities. It was found that the test results varied according to the relationship between the size of the test specimen and the test indenter. It is recommended that investigators create a testing situation that reflects their application when determining the cushioning capabilities of these materials.

Published
1998

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