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9 results on '"Yennello, Sherry J."'

1. Mechanism of astatine and bismuth sorption on extraction chromatography resins from nitric acid media

Author

Tereshatov, Evgeny E., Burns, Jonathan D., Schultz, Steven J., Green, Brooklyn D., Picayo, Gabriela A., McCann, Laura A., McIntosh, Lauren A., Tabacaru, Gabriel C., Abbott, Austin, Berko, Matthew, Engelthaler, Emily, Hagel, Kris, Hankins, Travis, Harvey, Bryan, Hoekstra, Lauren, Lofton, Kylie, Regener, Sebastian, Rider, Robert, Sorensen, Maxwell, Tabacaru, Alexandra, Thomas, David, Tobar, Justin, Tobin, Zachary, and Yennello, Sherry J.

Published
2023
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3. Using Light Charged Particles to Probe the Asymmetry Dependence of the Nuclear Caloric Curve

Author

McIntosh, Alan B., Bonasera, Aldo, Kohley, Zachary, Cammarata, Paul J., Hagel, Kris, Heilborn, Lauren, Mabiala, Justin, May, Larry W., Marini, Paola, Raphelt, Andrew, Souliotis, George A., Wuenschel, Sara, Zarrella, Andrew, and Yennello, Sherry J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Recently, we observed a clear dependence of the nuclear caloric curve on neutron-proton asymmetry $\frac{N-Z}{A}$ through examination of fully reconstructed equilibrated quasi-projectile sources produced in heavy ion collisions at E/A = 35 MeV. In the present work, we extend our analysis using multiple light charged particle probes of the temperature. Temperatures are extracted with five distinct probes using a kinetic thermometer approach. Additionally, temperatures are extracted using two probes within a chemical thermometer approach (Albergo method). All seven measurements show a significant linear dependence of the source temperature on the source asymmetry. For the kinetic thermometer, the strength of the asymmetry dependence varies with the probe particle species in a way which is consistent with an average emission-time ordering., Comment: 7 pages, 4 figures

Published
2013
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4. Asymmetry Dependence of the Nuclear Caloric Curve

Author

McIntosh, Alan B., Bonasera, Aldo, Cammarata, Paul, Hagel, Kris, Heilborn, Lauren, Kohley, Zachary, Mabiala, Justin, May, Larry W., Marini, Paola, Raphelt, Andrew, Souliotis, George A., Wuenschel, Sara, Zarrella, Andrew, and Yennello, Sherry J.

Subjects
Nuclear Experiment
Abstract

A basic feature of the nuclear equation of state is not yet understood: the dependence of the nuclear caloric curve on the neutron-proton asymmetry. Predictions of theoretical models differ on the magnitude and even the sign of this dependence. In this work, the nuclear caloric curve is examined for fully reconstructed quasi-projectiles around mass A=50. The caloric curve extracted with the momentum quadrupole fluctuation thermometer shows that the temperature varies linearly with quasi-projectile asymmetry (N-Z)/A. An increase in asymmetry of 0.15 units corresponds to a decrease in temperature on the order of 1 MeV. These results also highlight the importance of a full quasi-projectile reconstruction in the study of thermodynamic properties of hot nuclei.

Published
2012
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5. Isospin non-equilibrium in heavy-ion collisions at intermediate energies

Author

Li, Bao-An and Yennello, Sherry J.

Subjects
Nuclear Theory
Abstract

We study the equilibration of isospin degree of freedom in intermediate energy heavy-ion collisions using an isospin-dependent BUU model. It is found that there exists a transition from the isospin equilibration at low energies to non-equilibration at high energies as the beam energy varies across the Fermi energy in central, asymmetric heavy-ion collisions. At beam energies around 55 MeV/nucleon, the composite system in thermal equilibrium but isospin non-equilibrium breaks up into two primary hot residues with N/Z ratios closely related to those of the target and projectile respectively. The decay of these forward-backward moving residues results in the strong isospin asymmetry in space and the dependence of the isotopic composition of fragments on the N/Z ratios of the target and projectile. These features are in good agreement with those found recently in experiments at NSCL/MSU and TAMU, implications of these findings are discussed., Comment: 9 pages, latex, + 3 figures available upon request

Published
1995
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6. Beam commissioning of the SπRIT time projection chamber

Author

Jhang, Genie, Barney, Jon, Estee, Justin, Isobe, Tadaaki, Kaneko, Masanori, Kurata-Nishimura, Mizuki, Cerizza, Giordano, Santamaria, Clementine, Lee, Jung Woo, Lasko, Paweł, Łukasik, Jerzy, Lynch, William G., McIntosh, Alan B., Murakami, Tetsuya, Pawłowski, Piotr, Shane, Rebecca, Tangwancharoen, Suwat, Tsang, Manyee Betty, Baba, Hidetada, Hong, Byungsik, Kim, Young Jin, Lee, Hyo Sang, Otsu, Hideaki, Pelczar, Krzysztof, Sakurai, Hiroyoshi, Suzuki, Daisuke, Xiao, Zhigang, Yennello, Sherry J., Zhang, Yan, and SπRIT Collaboration

Published
2016
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7. Progress in constraining the asymmetry dependence of the nuclear caloric curve

Author

McIntosh Alan B. and Yennello Sherry J.

Subjects
Physics, QC1-999
Abstract

The nuclear equation of state is a basic emergent property of nuclear material. Despite its importance in nuclear physics and astrophysics, aspects of it are still poorly constrained. Our research focuses on answering the question: How does the nuclear caloric curve depend on the neutron-proton asymmetry? We briefly describe our initial observation that increasing neutron-richness leads to lower temperatures. We then discuss the status of our recently executed experiment to independently measure the asymmetry dependence of the caloric curve.

Published
2016
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8. The ASY-EOS Experiment at GSI

Author

Russotto, Paolo, Chartier, Marielle, Cozma, Mircea Dan, De Filippo, Enrico, Le Fèvre, Arnaud, Gannon, S., Gašparić, Igor, Kis, M., Kupny, S., Leifels, Yvonne, Lemmon, Roy Crawford, Li, Q., Lukasik, J., Marini, P., Pawlowski, P., Trautmann, Wolfgang, Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, Francesca, Auditore, Lucrezia, Aumann, Thomas, Ayyad, Y., Baran, V., Basrak, Z., Bassini, R., Benlliure Anaya, Jose Fernando, Boiano, Ciro, Boisjoli, M., Boretzky, Konstanze, Brzychczyk, Janusz, Budzanowski, Andrzej, Cardella, Giuseppe, Chajecki, Zbigniew, Chbihi, A., Colonna, Maria, Czech, Bronislaw, Di Toro, Massimo, Famiano, Michael A., Greco, V., Grassi, L., Guazzoni, Chiara, Guazzoni, P., Heil, Michael, Heilborn, L., Introzzi, Riccardo, Isobe, Tadaaki, Kezzar, K., Krasznahorkay, Attila, Kurz, Nikolaus, La Guidara, E., Lanzalone, Gaetano, Lasko, P., Lombardo, Ivano, Lynch, William G., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pirrone, Sara, Pleskac, Radek, Politi, Giuseppe, Porto, Francesco, Reifarth, René, Reisdorf, Willibrord, Riccio, F., Rizzo, Francesca, Rosato, E., Rossi, Dominic M., Santoro, S., Simon, Haik, Skwirczynska, I., Sosin, Zbigniew, Stuhl, László, Trifirò, Antonio, Trimarchi, Marina, Tsang, M. Betty, Verde, Giuseppe, Veselsky, M., Vigilante, Mariano, Wieloch, A., Wigg, P., Wolter, Hermann, Wu, P., Yennello, Sherry J., Zambon, P., Zetta, L., Zoric, Maja, Russotto, Paolo, Chartier, Marielle, Cozma, Mircea Dan, De Filippo, Enrico, Le Fèvre, Arnaud, Gannon, S., Gašparić, Igor, Kis, M., Kupny, S., Leifels, Yvonne, Lemmon, Roy Crawford, Li, Q., Lukasik, J., Marini, P., Pawlowski, P., Trautmann, Wolfgang, Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, Francesca, Auditore, Lucrezia, Aumann, Thomas, Ayyad, Y., Baran, V., Basrak, Z., Bassini, R., Benlliure Anaya, Jose Fernando, Boiano, Ciro, Boisjoli, M., Boretzky, Konstanze, Brzychczyk, Janusz, Budzanowski, Andrzej, Cardella, Giuseppe, Chajecki, Zbigniew, Chbihi, A., Colonna, Maria, Czech, Bronislaw, Di Toro, Massimo, Famiano, Michael A., Greco, V., Grassi, L., Guazzoni, Chiara, Guazzoni, P., Heil, Michael, Heilborn, L., Introzzi, Riccardo, Isobe, Tadaaki, Kezzar, K., Krasznahorkay, Attila, Kurz, Nikolaus, La Guidara, E., Lanzalone, Gaetano, Lasko, P., Lombardo, Ivano, Lynch, William G., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pirrone, Sara, Pleskac, Radek, Politi, Giuseppe, Porto, Francesco, Reifarth, René, Reisdorf, Willibrord, Riccio, F., Rizzo, Francesca, Rosato, E., Rossi, Dominic M., Santoro, S., Simon, Haik, Skwirczynska, I., Sosin, Zbigniew, Stuhl, László, Trifirò, Antonio, Trimarchi, Marina, Tsang, M. Betty, Verde, Giuseppe, Veselsky, M., Vigilante, Mariano, Wieloch, A., Wigg, P., Wolter, Hermann, Wu, P., Yennello, Sherry J., Zambon, P., Zetta, L., and Zoric, Maja

Abstract

The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of heavy ions at pre-relativistic energies has been proposed as an observable sensitive to the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. In the ASY-EOS experiment at the GSI laboratory, flows of neutrons and light charged particles were measured for 197Au+197Au collisions at 400 MeV/nucleon. Flow results obtained for the Au+Au system, in comparison with predictions of the UrQMD transport model, confirm the moderately soft to linear density dependence of the symmetry energy deduced from the earlier FOPI-LAND data.

Published
2016

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