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1. Comparison of Source Images for protons, $\pi^-$'s and $\Lambda$'s in 6 AGeV Au+Au collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A. C., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Srivastava, B., Stone, N. T. B, Symons, T. J. M., Whitfield, J., Witt, R., Wood, L., Zhang, W. N., Brown, D., Pratt, S., Wang, F., and Danielewicz, P.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Source images are extracted from two-particle correlations constructed from strange and non-strange hadrons produced in 6 AGeV Au + Au collisions. Very different source images result from pp vs p$\Lambda$ vs $\pi^-\pi^-$ correlations. These observations suggest important differences in the space-time emission histories for protons, pions and neutral strange baryons produced in the same events.

Published
2002

2. Multifragmentation and the Phase Transition: A Systematic Study of the MF of 1A GeV Au, La, and Kr

Author

Srivastava, B. K., Albergo, Sebastiano Francesco, Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, Salvatore, Elliott, J., Gilkes, M., Hauger, J. A., Hirsch, A., Hjort, E. L., Justice, M., Keane, D., Lindenstruth, V., Matis, H. S., Mcmahan, M., Mcparland, C., Mueller, W. F. J., Olson, D. L., Partlan, M., Porile, N., Potenza, R., Rai, G., Rasmussen, J., Romanski, J., Romero, J. L., Russo, G. V., Sann, H., Scharenberg, R., Scott, A., Shao, Y., Symons, T. J. M., Tincknell, M., Tuve', Cristina Natalina, Wang, S., Warren, P. G., Weerasundara, D, Wieman, H. H., Wolf, AND K. L., and Insolia, Antonio

Published
2002

3. Laying the groundwork at the AGS: Recent results from experiment E895

Author

E895 Collaboration, Lisa, M. A., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Chung, P., Cole, B., Crowe, K., Das, A. C., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Law, C., Lauret, J., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., Stone, N. T. B., Symons, T. J. M., Wang, S., Wells, R., Whitfield, J., Wienold, T., Witt, R., Wood, L., and Zhang, W. N.

Subjects
Physics, Nuclear and High Energy Physics, Time projection chamber, Nuclear Theory, FOS: Physical sciences, Strangeness production, Spectral line, Nuclear physics, Interferometry, Correlation function (statistical mechanics), Pion, Particle flow, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The E895 Collaboration at the Brookhaven AGS has performed a systematic investigation of Au+Au collisions at 2-8 AGeV, using a large-acceptance Time Projection Chamber. In addition to extensive measurements of particle flow, spectra, two-particle interferometry, and strangeness production, we have performed novel hybrid analyses, including azimuthally-sensitive pion HBT, extraction of the six-dimensional pion phasespace density, and a first measurement of the Lambda-proton correlation function., Presented at Quark Matter 2001, 8 pages, 5 figures

Published
2001

4. Anti-flow of K$^0_s$ Mesons in 6 AGeV Au + Au Collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., BStone, N. T., Symons, T. J. M., Wienold, T., Whitfield, R. Witt J., Wood, L., and Zhang, W. N.

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We have measured the sideward flow of neutral strange ($K^0_s$) mesons in 6 AGeV Au + Au collisions. A prominent anti-flow signal is observed for an impact parameter range (b $\lesssim 7$ fm) which spans central and mid-central events. Since the $K^0_s$ scattering cross section is relatively small in nuclear matter, this observation suggests that the in-medium kaon vector potential plays an important role in high density nuclear matter., 5 pages, including 3 figs

Published
2001

5. Directed Flow of $\Lambda$-Hyperons in 2-6 AGeV Au+Au Collisions

Author

Chung, P., Ajitanand, N. N., Alexander, J. M., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., Hjort, E. L., Huo, L., Justice, M., Kaplan, M., Keane, D., Kintner, J. C., Klay, J., Krofcheck, D., Lacey, R. A., Lauret, J., Lisa, M. A., Liu, H., Liu, Y. M., McGrath, R., Milosevich, Z., Odyniec, G., Olson, D. L., Panitkin, S. Y., Pinkenburg, C., Porile, N. T., Rai, G., Ritter, H. G., Romero, J. L., Scharenberg, R., Schroeder, L., Srivastava, B., BStone, N. T., Symons, T. J. M., Wienold, T., Whitfield, R. Witt J., Wood, L., and Zhang, W. N.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Directed flow measurements for $\Lambda$-hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2, 4, and 6 AGeV; $b < 5 - 6$ fm). The measurements indicate that $\Lambda$-hyperons flow consistently in the same direction and with smaller magnitudes than those of protons. Such a strong positive flow [for $\Lambda$s] has been predicted in calculations which include the influence of the $\Lambda$-nucleon potential. The experimental flow ratio $\Lambda$/p is in qualitative agreement with expectations ($\sim 2/3$) from the quark counting rule at 2 AGeV but is found to decrease with increasing beam energy., Comment: 5 pages including 4 Figs. Submitted to Phys. Rev. Lett

Published
2001

6. Comparison of 1 A GeV Au + C data with thermodynamics: The nature of phase transition in nuclear multifragmentation

Author

Scharenberg, R., Srivastava, B. K., Albergo, S., Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, S., Elliott, J., Gilkes, M., Hauger, J. A., Hirsch, A., Hjort, E. L., Justice, M., Keane, D., Insolia, A., Lindenstruth, V., Matis, H. S., Mcmahan, M., Mcparland, C., Mueller, W. F. J., Olson, D. L., Partlan, M., Porile, N., Potenza, R., Rai, G., Rasmussen, J., Romanski, J., Romero, J. L., Russo, G. V., Sann, H., Scott, A., Shao, Y., Symons, T. J. M., Tincknell, M., Tuve', Cristina Natalina, Wang, S., Warren, P. G., Weerasundara, D, Wieman, H. H., and Wolf, AND K. L.

Published
2001

7. Nuclear Multifragmentation, percolation and the Fisher Droplet Model: common features of reducibility and thermal scaling

Author

Elliott, J. B., Moretto, L. G., Phair, L., Wozniak, G. J., Albergo, Sebastiano Francesco, Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, Salvatore, Gilkes, M. L., Hauger, J. A., Hirsch, A. S., Hjort, E. L., Insolia, Antonio, Justice, M., Keane, D., Kintner, J. C., Lindenstruth, V., Lisa, M. A., Matis, H. S., Mcmahan, M., Mcparland, C., Mueller, W. F. J., Olson, D. L., Partlan, M. D., Porile, N. T., Potenza, R., Rai, G., Rasmussen, J., Ritter, H. G., Romanski, J., Romero, J. L., Russo, G. V., Sann, H., Scharenberg, R. P., Scott, A., Shao, Y., Srivastava, B. K., Symons, T. J. M., Tincknell, M., Tuve', Cristina Natalina, Wang, S., Warren, P. G., Wieman, H. H., Wienold, T., Wolf, AND K., and Eos, Collaboration

Subjects
Physics, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Nuclear system, Surface energy, symbols.namesake, Thermal, Boltzmann constant, Cluster size, Exponent, symbols, Statistical physics, Multiplicity (chemistry), Nuclear Experiment (nucl-ex), Nuclear Experiment, Scaling
Abstract

It is shown that the Fisher Droplet Model (FDM), percolation and nuclear multifragmentation share the common features of reducibility (stochasticity in multiplicity distributions) and thermal scaling (one-fragment production probabilities are Boltzmann factors). Barriers obtained, for cluster production on percolation lattices, from the Boltzmann factors show a power-law dependence on cluster size with an exponent of 0.42 +- 0.02. The EOS Au multifragmentation data yield barriers with a power-law exponent of 0.68 +- 0.03. Values of the surface energy coefficient of a low density nuclear system are also extracted., Comment: four pages and five figures

Published
2000

8. Comparison of the 1A GeV 197Au + C Interaction with First-Stage Transport Codes

Author

Srivastava, B. K., Albergo, S., Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, Salvatore, Elliott, J. B., Gilkes, M. L., Hauger, J. A., Hirsch, A. S., Hjort, E. L., Insolia, A., Justice, M., Keane, D., Kintner, J. C., Lindenstruth, V., Lisa, M. A., Matis, H. S., Mcmahan, M., Mcparland, C., Müller, W. F. J., Olson, D. L., Partlan, M. D., Porile, N. T., Potenza, R., Rai, G., Rasmussen, J., Ritter, H. G., Romanski, J., Romero, J. L., Russo, G. V., Sann, H., Scharenberg, R. P., Scott, A., Shao, Y., Symons, T. J. M., Tincknell, M., Tuve', Cristina Natalina, Wang, S., Warren, P., Wieman, H. H., Wienold, T., Wolf, K., and Eos, Collaboration

Published
1999

9. Lambda hyperons in 2A-GeV Ni + Cu collisions

Author

Justice, M., Albergo, Sebastiano Francesco, Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, Salvatore, Elliott, J. B., Gilkes, M. L., Hauger, J. A., Hirsch, A. S., Hjort, E. L., Insolia, Antonio, Keane, D., Kintner, J. C., Lisa, M. A., Liu, H., Matis, H. S., Mcgrath, R., Mcmahan, M., Mcparland, C., Olson, D. L., Partlan, M. D., Porile, N. T., Potenza, R., Rai, G., Rasmussen, J. O., Ritter, H. G., Romanski, J., Romero, J. L., Russo, G. V., Scharenberg, R. P., Scott, A., Shao, Y., Srivastava, B. K., Symons, T. J. M., Tincknell, M., Tuve', Cristina Natalina, Wang, S., Warren, P. G., Weerasundara, D., Wieman, H. H., Wienold, T., Wolf, K., and Eos, Collaboration

Published
1998

10. The Evolution of Nuclear Multifragmentation in the Temperature-Density Plane

Author

Warren, P. G., Albergo, S., Alexander, J. M., Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, S., Elliott, J. B., Gilkes, M. L., Hauger, J. A., Hirsch, A. S., Hjort, E. L., Insolia, A., Justice, M., Keane, D., Kitner, J. C., Lacey, R., Lauret, J., Lindenstruth, V., Lisa, M. A., Matis, H. S., McGrath, R. L., McMahan, M., McParlan, C., Mueller, W. F. J., Olson, D. L., Partlan, M. D., Porile, N. T., Potenza, R., Rai, G., Rasmussen, J., Ritter, H. G., Romanski, J., Romero, J. L., Russo, G. V., Sann, H., Scharenberg, R. P., Scott, A., Shao, Y., Srivastava, B. K., Symons, T. J. M., Tincknell, M. L., Tuve, C., Wang, S., Wieman, H. H., Wienold, T., and Wolf, K.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The mean transverse kinetic energies of the fragments formed in the interaction of 1 A GeV Au+C have been determined. An energy balance argument indicates the presence of a collective energy which increases in magnitude with increasing multiplicity and accounts for nearly half of the measured mean transverse kinetic energy. The radial flow velocity associated with the collective energy yields estimates for the time required to expand to the freeze-out volume. Isentropic trajectories in the temperature-density plane are shown for the expansion and indicate that the system goes through the critical region at the same multiplicities as deduced from a statistical analysis. Here, the expansion time is approximately 70 fm/c.

Published
1996

11. Dynamics of the multifragmentation of 1-A-GeV gold on carbon

Author

Hauger, J. A., Albergo, Sebastiano Francesco, Bieser, F., Brady, F. P., Caccia, Z., Cebra, D. A., Chacon, A. D., Chance, J. L., Choi, Y., Costa, Salvatore, Elliott, J. B., Gilkes, M. L., Hirsch, A. S., Hjort, E. L., Insolia, Antonio, Justice, M., Keane, D., Kintner, J. C., Lindenstruth, V., Lisa, M. A., Lynen, U., Matis, H. S., Mcmahan, M., Mcparland, C., Müller, W. F. J., Olson, D. L., Partlan, M. D., Porile, N. T., Potenza, R., Rai, G., Rasmussen, J., Ritter, H. G., Romanski, J., Romero, J. L., Russo, G. V., Sann, H., Scharenberg, R., Scott, A., Shao, Y., Srivastava, B. K., Symons, T. J. M., Tincknell, M., Tuve', Cristina Natalina, Wang, S., Warren, P., Wieman, H. H., Wienold, T., Wolf, K., and Eos, Collaboration

Subjects
Physics, Critical point (thermodynamics), General Physics and Astronomy, Continuous phase transition, Multiplicity (chemistry), Atomic physics, Two stages, Caloric curve, Excitation
Abstract

An exclusive study of the interaction of 1{ital A}GeV Au with C shows a separability into two stages: a prompt stage involving emission of most {ital Z}=1 and some {ital Z}=2 particles and a second stage involving the decay of an equilibrated remnant, which typically undergoes multifragmentation. The mean mass, charge, excitation energy, and the initial temperature {ital T}{sub {ital i}} of the remnant have been determined as a function of the total charge multiplicity, {ital m}, as has the freeze-out temperature {ital T}{sub {ital f}}. Both {ital T}{sub {ital i}} and {ital T}{sub {ital f}} increase linearly with {ital m} and their values at the critical point have been determined. {ital T}{sub {ital f}} rises monotonically with excitation energy as expected for a continuous phase transition. {copyright} {ital 1996 The American Physical Society.}

Published
1996

12. Is there evidence for a liquid-gas phase transition in nuclear matter?

Author

Hirsch, A S, Albergo, S, Bieser, F, Brady, F P, Caccia, Z, Cebra, D A, Chacon, A D, Chance, J L, Choi, Y, Costa, S, Elliott, J B, Gilkes, M L, Hauger, J A, Hjort, E L, Insolia, A, Justice, M, Keane, D, Kintner, J C, Lindenstruth, V, Lisa, M A, Lynen, U, Matis, H S, McMahan, M, McParland, C P, Müller, W F, Olson, D L, Porile, N T, Potenza, R, Rai, G, Rasmussen, J, Ritter, H G, Romanski, J, Romero, J L, Russo, G V, Sann, H, Scharenberg, R P, Scott, A, Shao, Y, Srivastava, B K, Symons, T J M, Tincknell, M L, Tuvé, C, Wang, S, Warren, P, Wieman, H H, and Wolf, K

Subjects
Nuclear Physics
Published
1994

13. Heavy ion reaction measurements with the EOS TPC (looking for central collisions with missing energy)

Author

Wieman, H H, Albergo, S, Bieser, F, Brady, F P, Caccia, Z, Cebra, D A, Chacon, A D, Chance, J L, Choi, Y, Costa, S, Elliott, J, Gilkes, M L, Hauger, J A, Hirsch, A, Hjort, E L, Insolia, A, Justice, M, Keane, D, Lindenstruth, V, Matis, H S, McMahan, M, McParland, C P, Müller, W F, Olson, D L, Partlan, M, Porile, N T, Potenza, R, Rai, G, Rasmussen, J, Ritter, H G, Romanski, J, Romero, J L, Russo, G V, Sann, H, Scharenberg, R P, Scott, A, Shao, Y, Srivastava, B K, Symons, T J M, Tincknell, M L, Tuvé, C, Wang, S, Warren, P, Weerasundara, D D, and Wolf, K L

Subjects
Nuclear Physics
Published
1994

14. The determination of critical exponents from the multifragmentation of gold nuclei

Author

Gilkes, M L, Albergo, S, Bieser, F, Brady, F P, Caccia, Z, Cebra, D A, Chacon, A D, Chance, J L, Choi, Y, Costa, S, Elliott, J B, Hauger, J A, Hirsch, A S, Hjort, E L, Insolia, A, Justice, M, Keane, D, Kintner, J C, Lindenstruth, V, Lisa, M A, Lynen, U, Matis, H S, McMahan, M, McParland, C P, Müller, W F, Olson, D L, Partlan, M D, Porile, N T, Potenza, R, Rai, G, Rasmussen, J, Ritter, H G, Romanski, J, Romero, J L, Russo, G V, Sann, H, Scharenberg, R P, Scott, A, Shao, Y, Srivastava, B K, Symons, T J M, Tincknell, M L, Tuvé, C, Wang, S, Warren, P, Wieman, H H, and Wolf, K

Subjects
Nuclear Physics
Published
1994

15. Radial flow in Au + Au collisions at E = 0.25 - 1.15 A GeV

Author

Lisa, M A, Albergo, S, Bieser, F, Brady, F P, Caccia, Z, Cebra, D A, Chacon, A D, Chance, J L, Choi, Y, Costa, S, Elliott, J B, Gilkes, M L, Hauger, J A, Hirsch, A S, Hjort, E L, Insolia, A, Justice, M, Keane, D, Kintner, J C, Matis, H S, McMahan, M, McParland, C P, Olson, D L, Partlan, M D, Porile, N T, Potenza, R, Rai, G, Rasmussen, J, Ritter, H G, Romanski, J, Romero, J L, Russo, G V, Scharenberg, R P, Scott, A, Shao, Y, Srivastava, B K, Symons, T J M, Tincknell, M L, Tuvé, C, Wang, S, Warren, P, Westfall, G D, Wieman, H H, and Wolf, K

Subjects
Nuclear Physics
Published
1994

16. Universality in fragment inclusive yields from Au+Au collisions.

Author

Insolia, A., Tuve`, C., Albergo, S., Bieser, F., Brady, F. P., Caccia, Z., Cebra, D., Chacon, A. D., Chance, J. L., Choi, Y., Costa, S., Elliott, J. B., Gilkes, M., Hauger, J. A., Hirsch, A. S., Hjort, E. L., Justice, M., Keane, D., Kintner, J., and Lisa, M.

Subjects
COLLISIONS (Nuclear physics), SILVER
Abstract

The inclusive light fragmem (Z ≤ 7) yield data in Au+Au reactions, measured by the EOS Collaboration at the LBNL Bevalac, are presented and discussed. For peripheral collisions the measured charge distributions develop progressively according to a power law which can be fitted by a single τ exponent independently of the bombarding energy in the range 250 - 1200 A MeV. In addition to this universal feature, we observe that the location of the maximum in the individual yields of different charged fragments shift towards lower multiplicity as the fragment charge increases from Z = 3 to Z = 7. This trend is common to all six measured beam energies. Moments of charge distributions and correlations among different monents are reported. Finally, the T[sub He,DT] thermometer has been constructed for central and peripheral collisions using the double yield ratios of He and D,T projectile fragments. The measured nuclear temperatures are in agreement with experimental findings in other fragmentation reactions. [ABSTRACT FROM AUTHOR]

Published
2001

19. Neutral strange particle production and flow at AGS energies.

Author

Chung, P., Collaboration, the E895, Alexander, J. M., Ajitanand, N. N., Anderson, M., Best, D., Brady, F. P., Case, T., Caskey, W., Cebra, D., Chance, J. L., Cole, B., Crowe, K., Das, A., Draper, J. E., Gilkes, M. L., Gushue, S., Heffner, M., Hirsch, A. S., and Hjort, E. L.

Published
1999
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20. Near-threshold production of the multistrange Xi- hyperon.

Author

Chung P, Ajitanand NN, Alexander JM, Anderson M, Best D, Brady FP, Case T, Caskey W, Cebra D, Chance JL, Cole B, Crowe K, Das AC, Draper JE, Gilkes ML, Gushue S, Heffner M, Hirsch AS, Hjort EL, Holzmann W, Huo L, Issah M, Justice M, Kaplan M, Keane D, Kintner JC, Klay J, Krofcheck D, Lacey RA, Lauret J, Lisa MA, Liu H, Liu YM, Milan J, McGrath R, Milosevich Z, Odyniec G, Olson DL, Panitkin S, Porile NT, Rai G, Ritter HG, Romero JL, Scharenberg R, Srivastava B, Stone NT, Symons TJ, Taranenko A, Whitfield J, Wienold T, Witt R, Wood L, Zhang WN, and Oeschler H

Abstract

The yield for the multistrange Xi(-) hyperon has been measured in 6A GeV Au+Au collisions via reconstruction of its decay products pi(-) and Lambda, the latter also being reconstructed from its daughter tracks of pi(-) and p. The measurement is rather close to the threshold for Xi(-) production and therefore provides an important test of model predictions. The measured yield for Xi(-) and Lambda are compared for several centralities. In central collisions the Xi(-) yield is found to be in excellent agreement with statistical and transport model predictions, suggesting that multistrange hadron production approaches chemical equilibrium in high baryon density nuclear matter.

Published
2003
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21. Comparison of source images for protons, pi-'s, and lambda's in 6A GeV Au+Au collisions.

Author

Chung P, Ajitanand NN, Alexander JM, Anderson M, Best D, Brady FP, Case T, Caskey W, Cebra D, Chance JL, Cole B, Crowe K, Das AC, Draper JE, Gilkes ML, Gushue S, Heffner M, Hirsch AS, Hjort EL, Holzmann W, Huo L, Issah M, Justice M, Kaplan M, Keane D, Kintner JC, Klay J, Krofcheck D, Lacey RA, Lauret J, Lisa MA, Liu H, Liu YM, McGrath R, Milosevich Z, Odyniec G, Olson DL, Panitkin S, Porile NT, Rai G, Ritter HG, Romero JL, Scharenberg R, Srivastava B, Stone NT, Symons TJ, Taranenko A, Whitfield J, Witt R, Wood L, Zhang WN, Brown D, Pratt S, Wang F, and Danielewicz P

Abstract

Source images are extracted from two-particle correlations constructed from strange and nonstrange hadrons produced in 6A GeV Au+Au collisions. Very different source images result from pp vs p Lambda vs pi(-)pi(-) correlations. Scaling by transverse mass can describe the apparent source size ratio for p/pi(-) but not for Lambda/pi(-) or Lambda/p. These observations suggest important differences in the space-time emission histories for protons, pions, and neutral strange baryons produced in the same events.

Published
2003
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22. Longitudinal flow of protons from (2-8)A GeV central Au+Au collisions.

Author

Klay JL, Ajitanand NN, Alexander JM, Anderson MG, Best D, Brady FP, Case T, Caskey W, Cebra D, Chance JL, Chung P, Cole B, Crowe K, Das AC, Draper JE, Gilkes ML, Gushue S, Heffner M, Hirsch AS, Hjort EL, Huo L, Justice M, Kaplan M, Keane D, Kintner JC, Krofcheck D, Lacey RA, Lauret J, Law C, Lisa MA, Liu H, Liu YM, McGrath R, Milosevich Z, Odyniec G, Olson DL, Panitkin SY, Pinkenburg C, Porile NT, Rai G, Ritter HG, Romero JL, Scharenberg R, Schroeder L, Srivastava B, Stone NT, Symons TJ, Wang S, Wells R, Whitfield J, Wienold T, Witt R, Wood L, and Zhang WN

Abstract

Rapidity distributions of protons from central 197Au+197Au collisions measured by the E895 Collaboration in the energy range from (2-8)A GeV at the Brookhaven AGS are presented. Longitudinal flow parameters derived using a thermal model including collective longitudinal expansion are extracted from these distributions. The results show an approximately linear increase in the longitudinal flow velocity, (L), as a function of the logarithm of beam energy.

Published
2002
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23. Directed flow of lambda hyperons in (2-6 )A GeV Au+Au collisions.

Author

Chung P, Ajitanand NN, Alexander JM, Anderson M, Best D, Brady FP, Case T, Caskey W, Cebra D, Chance JL, Cole B, Crowe K, Das A, Draper JE, Gilkes ML, Gushue S, Heffner M, Hirsch AS, Hjort EL, Huo L, Justice M, Kaplan M, Keane D, Kintner JC, Klay J, Krofcheck D, Lacey RA, Lauret J, Lisa MA, Liu H, Liu YM, McGrath R, Milosevich Z, Odyniec G, Olson DL, Panitkin SY, Pinkenburg C, Porile NT, Rai G, Ritter HG, Romero JL, Scharenberg R, Schroeder L, Srivastava B, Stone NT, Symons TJ, Wienold T, Witt R, Whitfield J, Wood L, and Zhang WN

Abstract

Directed flow measurements for Lambda hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2A, 4A, and 6A GeV; b<5-6 fm). The measurements indicate that Lambda hyperons flow consistently in the same direction but with smaller magnitudes. A strong positive flow [for Lambdas] has been predicted in calculations which include the influence of the Lambda-nucleon potential. The experimental flow ratio Lambda/p is in qualitative agreement with expectations (approximately 2/3) from the quark counting rule at 2A GeV but is found to decrease with increasing beam energy.

Published
2001
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