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Your search keyword '"Danielewicz, P."' showing total 31 results
Start Over Author "Danielewicz, P." Publication Type Electronic Resources
31 results on '"Danielewicz, P."'

1. Superradiance, disorder, and the non-Hermitian Hamiltonian in open quantum systems

Author

Danielewicz, P, Levchenko, A, Zelevinsky, V, Celardo, Giuseppe, Biella, A, Giusteri, Giulio Giuseppe, Mattiotti, F, Zhang, Y, Kaplan, L., Celardo, Giuseppe (ORCID:0000-0002-3679-1954), Giusteri, Giulio Giuseppe (ORCID:0000-0001-9001-9706), Danielewicz, P, Levchenko, A, Zelevinsky, V, Celardo, Giuseppe, Biella, A, Giusteri, Giulio Giuseppe, Mattiotti, F, Zhang, Y, Kaplan, L., Celardo, Giuseppe (ORCID:0000-0002-3679-1954), and Giusteri, Giulio Giuseppe (ORCID:0000-0001-9001-9706)

Abstract

We first briefly review the non-Hermitian effective Hamiltonian approach to open quantum systems and the associated phenomenon of superradiance. We next discuss the superradiance crossover in the presence of disorder and the relationship between superradiance and the localization transition. Finally, we investigate the regime of validity of the energy-independent effective Hamiltonian approximation and show that the results obtained by these methods are applicable to realistic physical systems.

Published
2014

2. Constraints on the symmetry energy and neutron skins from experiments and theory

Author

Tsang, M. B., Stone, J. R., Camera, F., Danielewicz, P., Gandolfi, S., Hebeler, K., Horowitz, C. J., Lee, Jenny, Lynch, W. G., Kohley, Z., Lemmon, R., Moller, P., Murakami, T., Riordan, S., Roca-Maza, X., Sammarruca, F., Steiner, A. W., Vidaña, I., Yennello, S. J., Tsang, M. B., Stone, J. R., Camera, F., Danielewicz, P., Gandolfi, S., Hebeler, K., Horowitz, C. J., Lee, Jenny, Lynch, W. G., Kohley, Z., Lemmon, R., Moller, P., Murakami, T., Riordan, S., Roca-Maza, X., Sammarruca, F., Steiner, A. W., Vidaña, I., and Yennello, S. J.

Abstract

The symmetry energy contribution to the nuclear Equation of State (EoS) impacts various phenomena in nuclear astrophysics, nuclear structure, and nuclear reactions. Its determination is a key objective of contemporary nuclear physics with consequences for the understanding of dense matter within neutron stars. We examine the results of laboratory experiments that have provided initial constraints on the nuclear symmetry energy and its density dependence at and somewhat below normal nuclear matter density. Some of these constraints have been derived from properties of nuclei. Others have been derived from the nuclear response to electroweak and hadronic probes. We also examine the most frequently used theoretical models that predict the symmetry energy and its slope. By comparing existing constraints on the symmetry pressure to theories, we demonstrate how the contribution of the three-body force, an essential ingredient in neutron matter models, can be determined., Comment: 28 pages, 4 figures

Published
2012
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3. Constraints on the symmetry energy and neutron skins from experiments and theory

Author

Tsang, M. B., Stone, J. R., Camera, F., Danielewicz, P., Gandolfi, S., Hebeler, K., Horowitz, C. J., Lee, Jenny, Lynch, W. G., Kohley, Z., Lemmon, R., Moller, P., Murakami, T., Riordan, S., Roca-Maza, X., Sammarruca, F., Steiner, A. W., Vidaña, I., Yennello, S. J., Tsang, M. B., Stone, J. R., Camera, F., Danielewicz, P., Gandolfi, S., Hebeler, K., Horowitz, C. J., Lee, Jenny, Lynch, W. G., Kohley, Z., Lemmon, R., Moller, P., Murakami, T., Riordan, S., Roca-Maza, X., Sammarruca, F., Steiner, A. W., Vidaña, I., and Yennello, S. J.

Abstract

The symmetry energy contribution to the nuclear Equation of State (EoS) impacts various phenomena in nuclear astrophysics, nuclear structure, and nuclear reactions. Its determination is a key objective of contemporary nuclear physics with consequences for the understanding of dense matter within neutron stars. We examine the results of laboratory experiments that have provided initial constraints on the nuclear symmetry energy and its density dependence at and somewhat below normal nuclear matter density. Some of these constraints have been derived from properties of nuclei. Others have been derived from the nuclear response to electroweak and hadronic probes. We also examine the most frequently used theoretical models that predict the symmetry energy and its slope. By comparing existing constraints on the symmetry pressure to theories, we demonstrate how the contribution of the three-body force, an essential ingredient in neutron matter models, can be determined., Comment: 28 pages, 4 figures

Published
2012
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5. Collision Dynamics

Author

Knoll, J., Randrup, J., Fuchs, C., Aichelin, J., Bleicher, M., Bratkovskaya, E., Cassing, W., Danielewicz, P., Ivanov, Y., Kämpfer, B., Larionov, A., Toneev, V., Knoll, J., Randrup, J., Fuchs, C., Aichelin, J., Bleicher, M., Bratkovskaya, E., Cassing, W., Danielewicz, P., Ivanov, Y., Kämpfer, B., Larionov, A., and Toneev, V.

Abstract

"Collision Dynamics" is part of the CBM Physics Book.

Published
2011

7. Deducing spectroscopic factors from wave-function asymptotics

Author

Capel, Pierre, Danielewicz, P., Nunes, F.C., Capel, Pierre, Danielewicz, P., and Nunes, F.C.

Abstract

In a coupled-channel model, we explore the effects of coupling between configurations on the radial behavior of the wave function and, in particular, on the spectroscopic factor (SF) and the asymptotic normalization coefficient (ANC). We evaluate the extraction of a SF from the ratio of the ANC of the coupled-channel model to that of a single-particle approximation of the wave function. We perform this study within a core+n collective model, which includes two states of the core that connect by a rotational coupling. To get additional insights, we also use a simplified model that takes a δ function for the coupling potential. Calculations are performed for Be11. Fair agreement is obtained between the SF inferred from the single-particle approximation and the one obtained within the coupled-channel models. Significant discrepancies are observed only for large coupling strength and/or large admixture, that is, a small SF. This suggests that reliable SFs can be deduced from the wave-function asymptotics when the structure is dominated by one configuration, that is, for a large SF. © 2010 The American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2010

8. Transport Theories for Heavy-Ion Collisions in the 1 AGeV Regime

Author

Kolomeitsev, E. E., Hartnack, C., Barz, H. W., Bleicher, M., Bratkovskaya, E., Cassing, W., Chen, L. W., Danielewicz, P., Fuchs, C., Gaitanos, T., Ko, C. M., Larionov, A., Reiter, M., Wolf, G., Aichelin, J., Kolomeitsev, E. E., Hartnack, C., Barz, H. W., Bleicher, M., Bratkovskaya, E., Cassing, W., Chen, L. W., Danielewicz, P., Fuchs, C., Gaitanos, T., Ko, C. M., Larionov, A., Reiter, M., Wolf, G., and Aichelin, J.

Abstract

We compare multiplicities as well as rapidity and transverse momentum distributions of protons, pions and kaons calculated within presently available transport approaches for heavy ion collisions around 1 AGeV. For this purpose, three reactions have been selected: Au+Au at 1 and 1.48 AGeV and Ni+Ni at 1.93 AGeV.

Published
2005

9. Azimuthal Dependence of Collective Expansion for Symmetric Heavy-Ion Collisions

Author

Stoicea, G., Petrovici, M., Andronic, A., Herrmann, N., Alard, J. P., Barret, V., Basrak, Z., Bastid, N., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Hildenbrand, K. D., Hong, B., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Merschmeyer, M., Neubert, W., Pelte, D., Rami, F., Reisdorf, W., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, S., Stockmeier, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., Danielewicz, P., Stoicea, G., Petrovici, M., Andronic, A., Herrmann, N., Alard, J. P., Barret, V., Basrak, Z., Bastid, N., Caplar, R., Crochet, P., Dupieux, P., Dzelalija, M., Fodor, Z., Hildenbrand, K. D., Hong, B., Kecskemeti, J., Kim, Y. J., Kirejczyk, M., Korolija, M., Kotte, R., Kress, T., Lebedev, A., Leifels, Y., Lopez, X., Merschmeyer, M., Neubert, W., Pelte, D., Rami, F., Reisdorf, W., Schüll, D., Seres, Z., Sikora, B., Sim, K. S., Simion, V., Siwek-Wilczynska, K., Smolyankin, S., Stockmeier, M., Wisniewski, K., Wohlfarth, D., Yushmanov, I., Zhilin, A., and Danielewicz, P.

Abstract

Detailed studies of the azimuthal dependence of the mean fragment and flow energies in the Au+Au and Xe+CsI systems are reported as a function of incident energy and centrality. Comparisons between data and model calculations show that the flow energy values along different azimuthal directions could be viewed as snapshots of the fireball expansion with different exposure times. For the same number of participating nucleons more transversally elongated participant shapes from the heavier system produce less collective transverse energy. Good agreement with Boltzmann-Uehling-Uhlenbeck calculations is obtained for a soft nuclear equation of state.

Published
2004

10. Comparison of source images for protons, pi(-)'s, and Lambda's in 6A GeV 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., Holzmann, W., Huo, L., Issah, M., 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., Taranenko, A., Whitfield, J., Witt, R., Wood, L., Zhang, W. N., Brown, D., Pratt, S., Wang, F., Danielewicz, P., 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., Holzmann, W., Huo, L., Issah, M., 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., Taranenko, A., Whitfield, J., Witt, R., Wood, L., Zhang, W. N., 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 pLambda 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

11. Isospin diffusion in heavy ion reactions

Author

Tsang, M., Liu, T. X., Shi, L., Danielewicz, P., Gelbke, C. K., Liu, X. D., Lynch, W. G., Tan, W. P., Verde, G., Wagner, A., Xu, H. S., Friedman, W. A., Beaulieu, L., Davin, B., Souza, R. T., Larochelle, Y., Lefort, T., Yanez, R., Viola Jr., V. E., Charity, R. J., Sobotka, L. G., Tsang, M., Liu, T. X., Shi, L., Danielewicz, P., Gelbke, C. K., Liu, X. D., Lynch, W. G., Tan, W. P., Verde, G., Wagner, A., Xu, H. S., Friedman, W. A., Beaulieu, L., Davin, B., Souza, R. T., Larochelle, Y., Lefort, T., Yanez, R., Viola Jr., V. E., Charity, R. J., and Sobotka, L. G.

Abstract

Using symmetric 112Sn + 112Sn, 124Sn + 124Sn collision as references, we probe isospin diffusion in peripheral asymmetric 112Sn + 124Sn, 124Sn + 112Sn systems at incident energy of E/A = 50 MeV. Isoscalic analyses imply that the quasi-projectile and quasi-target in these collisions do not achieve isospin equilibrum, permitting an assesment of the isospin transport rates. We find that comparisons between isospin sensitive experimental and theoretical obstacles, using suitably chosen scaled ratios, permit investigation of the density dependence of the asymmetry term of the nuclear equation of state.

Published
2003

12. Comparison of source images for protons, pi(-)'s, and Lambda's in 6A GeV 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., Holzmann, W., Huo, L., Issah, M., 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., Taranenko, A., Whitfield, J., Witt, R., Wood, L., Zhang, W. N., Brown, D., Pratt, S., Wang, F., Danielewicz, P., 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., Holzmann, W., Huo, L., Issah, M., 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., Taranenko, A., Whitfield, J., Witt, R., Wood, L., Zhang, W. N., 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 pLambda 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

13. Hadronic Transport Model with a Phase Transition

Author

Danielewicz, P., Gossiaux, P. -B., Lacey, R. A., Danielewicz, P., Gossiaux, P. -B., and Lacey, R. A.

Abstract

We specify a tractable transport model with thermodynamic properties close to those expected for the strongly interacting matter. In particular, at high temperatures, the matter undergoes a phase transition, such as to the quark-gluon plasma, with a drop in masses of elementary excitations and a rapid increase in the number of degrees of freedom. We show that a softening of the equation of state such as associated with the transition to quark-gluon plasma should be observable in the elliptic-flow excitation function from heavy-ion reactions., Comment: Talk given at the Workshop on Nuclear Matter in Different Phases and Transitions, Les Houches, March 31 - April 10, 1998; 16 pages, 10 Postscript figures, LateX requires crkpab.sty, graphicx.sty, and amssymb.sty

Published
1998

14. Squeeze-out of nuclear matter in Au+Au collisions

Author

Tsang, M. B., Danielewicz, P., Hsi, W. C., Huang, M., Lynch, W. G., Bowman, D. R., Gelbke, K. C., Lisa, M. A., Peaslee, G. F., Charity, R. J., Sobotka, L. G., Begemann-Blaich, M., Cosmo, F., Ferrero, A., Hubele, J., Imme, G., Iori, I., Kempter, J., Kreutz, P., Kunde, G. J., Kunze, W. D., Lindenstruth, V., Lynen, U., Mang, M., Morroni, A., Müller, W. F. J., Neumann, M., Ocker, B., Ogilvie, C. A., Pochodzalla, J., Raciti, G., Rosenberger, F., Rubehn, T., Saun, H., Scardavnic, R., Schüttauf, A., Schwarz, C., Seidel, W., Serfling, V., Trautmann, W., Tucholski, A., Wörner, A., Zwieglinski, B., Tsang, M. B., Danielewicz, P., Hsi, W. C., Huang, M., Lynch, W. G., Bowman, D. R., Gelbke, K. C., Lisa, M. A., Peaslee, G. F., Charity, R. J., Sobotka, L. G., Begemann-Blaich, M., Cosmo, F., Ferrero, A., Hubele, J., Imme, G., Iori, I., Kempter, J., Kreutz, P., Kunde, G. J., Kunze, W. D., Lindenstruth, V., Lynen, U., Mang, M., Morroni, A., Müller, W. F. J., Neumann, M., Ocker, B., Ogilvie, C. A., Pochodzalla, J., Raciti, G., Rosenberger, F., Rubehn, T., Saun, H., Scardavnic, R., Schüttauf, A., Schwarz, C., Seidel, W., Serfling, V., Trautmann, W., Tucholski, A., Wörner, A., and Zwieglinski, B.

Published
1996

16. Hanbury-Brown--Twiss Analysis in a Solvable Model

Author

Bertsch, G. F., Danielewicz, P., Herrmann, M., Bertsch, G. F., Danielewicz, P., and Herrmann, M.

Abstract

The analysis of meson correlations by Hanbury-Brown--Twiss interferometry is tested with a simple model of meson production by resonance decay. We derive conditions which should be satisfied in order to relate the measured momentum correlation to the classical source size. The Bose correlation effects are apparent in both the ratio of meson pairs to singles and in the ratio of like to unlike pairs. With our parameter values, we find that the single particle distribution is too distorted by the correlation to allow a straightforward analysis using pair correlation normalized by the singles rates. An analysis comparing symmetrized to unsymmetrized pairs is more robust, but nonclassical off-shell effects are important at realistic temperatures., Comment: 21 pages + 9 figures (tarred etc. using uufiles, submitted separately), REVTeX 3.0, preprint number: DOE/ER/40561-112/INT93-00-37

Published
1993
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17. Hanbury-Brown--Twiss Analysis in a Solvable Model

Author

Bertsch, G. F., Danielewicz, P., Herrmann, M., Bertsch, G. F., Danielewicz, P., and Herrmann, M.

Abstract

The analysis of meson correlations by Hanbury-Brown--Twiss interferometry is tested with a simple model of meson production by resonance decay. We derive conditions which should be satisfied in order to relate the measured momentum correlation to the classical source size. The Bose correlation effects are apparent in both the ratio of meson pairs to singles and in the ratio of like to unlike pairs. With our parameter values, we find that the single particle distribution is too distorted by the correlation to allow a straightforward analysis using pair correlation normalized by the singles rates. An analysis comparing symmetrized to unsymmetrized pairs is more robust, but nonclassical off-shell effects are important at realistic temperatures., Comment: 21 pages + 9 figures (tarred etc. using uufiles, submitted separately), REVTeX 3.0, preprint number: DOE/ER/40561-112/INT93-00-37

Published
1993
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