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Wyświetlanie 1-10 z 69
Tytuł:
Study of the in medium cross-section and of the clustering process by means of the Bayesian technique applied to a nuclear reaction at Fermi energy
Autorzy:
Piantelli, S.
Lombardo, I.
Lemarié, J.
Casini, G.
Dell'Aquila, D.
Fable, Q.
Cicerchia, M.
Barlini, S.
Génard, T.
Nam, S. H.
Poggi, G.
LeNeindre, N.
Upadhyaya, S.
Verde, G.
Henri, M.
Fabris, D.
Kweon, M. J.
Ottanelli, P.
Parlog, M.
Vigilante, M.
Duenñas, J. A.
Bougault, R.
Rebillard-Soulié, A.
Camaiani, A.
Frosin, C.
Mazurek, K.
Ciampi, C.
Lopez, O.
Marchi, T.
Park, J.
Stefanini, A. A.
Frankland, J. D.
Kordyasz, A.
Chbihi, A.
Sun, B. H.
Vient, E.
Hong, B.
Pasquali, G.
Terashima, S.
Ono, A.
Gruyer, D.
Kim, S.
Borderie, B.
Valdré, S.
Kozik, Tomasz
Baldesi, L.
Opis:
A Bayesian analysis aimed at tuning two parameters of the AMD model, one of them related to the in medium nucleon nucleon cross-section and the other to the clustering, has been performed. Experimental data collected with four blocks of the FAZIA setup have been compared with simulated data built with different values of the investigated parameters.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u
Autorzy:
Łukasik, J.
Lynch, W.G.
Sochocka, Anna
Isobe, T.
Brzychczyk, Janusz
Boretzky, K.
Baba, H.
Ikeno, N.
Chiga, N.
Simon, H.
Kim, Y.J.
Fukuda, N.
Atar, L.
Ieki, K.
Lasko, Paweł
Sumikama, T.
Suzuki, D.
Kurata-Nishimura, M.
Nakamura, T.
Nishimura, S.
Jhang, G.
Lee, J.W.
Törnqvist, H.
Kondo, Y.
Lee, H.S.
Otsu, H.
Santamaria, C.
Snoch, A.
Sakurai, H.
Shimizu, Y.
Cerizza, G.
Horvat, A.
Ahn, D.S.
Gasparic, I.
Nakatsuka, N.
Inabe, N.
Kobayashi, T.
Morfouace, P.
Pawłowski, P.
Pelczar, Krzysztof
Sato, H.
Rossi, D.
Togano, Y.
Tangwancharoen, S.
Aumann, T.
Leifels, Y.
Barney, J.
Takeda, H.
Murakami, T.
Yennello, S.J.
Estee, J.
Shane, R.
Kaneko, M.
Wang, R.
Hong, B.
Xiao, Z.G.
Scheit, H.
Tsang, C.Y.
Ono, A.
Manfredi, J.
Tsang, M.B.
McIntosh, A.B.
Zhang, Y.
Suzuki, H.
Opis:
Radioactive tin beams were used to explore the flow observables under varying isospin asymmetries while maintaining a constant total charge. The rapidity dependence of directed flow (v$_{1}$) and elliptic flow (v$_{2}$) was studied for protons, deuterons, tritons, $^{3}$He, and $^{4}$He, produced in neutron-rich $^{132}$Sn + $^{124}$Sn and neutron-deficient $^{108}$Sn + $^{112}$Sn collisions at 270 MeV / nucleon. In general, heavier particles exhibited larger v$_{1}$ and v$_{2}$ values. The experimental data was used to test transport models which simulate heavy ion collisions. Specifically, comparisons were made with Antisymmetrized Molecular Dynamics (AMD) model calculations, which explicitly account for cluster correlations. Two types of momentum-dependent mean field potentials were tested. The results reveal that both v$_{1}$ and v$_{2}$ values are enhanced when the mean field incorporates stronger momentum dependence. In addition, v$_{2}$ exhibits larger sensitivity to symmetry energy than v$_{1}$ but the overall sensitivity to symmetry energy is low. In an attempt to describe the data, different parameter sets have been tried. Most describe either the hydrogen flow or helium flow reasonably well but none describes the flow of all particles simultaneously.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Constraining nucleon effective masses with flow and stopping observables from the S$\pi$RIT experiment
Autorzy:
Inabe, N.
Leifels, Y.
Shimizu, Y.
Zhang, Y. X.
Chiga, N.
Törnqvist, H.
Lasko, P.
Horvat, A.
Kobayashi, T.
Suzuki, H.
Pawłowski, P.
Sakurai, H.
Sato, H.
Kurata-Nishimura, M.
Kaneko, M.
Santamaria, C.
Scheit, H.
Isobe, T.
Manfredi, J.
Estee, J.
Cerizza, G.
Barney, J.
Pelczar, Krzysztof
Lee, H. S.
Boretzky, K.
Ahn, D. S.
Morfouace, P.
Gasparic, I.
Kondo, Y.
Atar, L.
Lee, J. W.
Lynch, W. G.
Nishimura, S.
Tangwancharoen, S.
Simon, H.
Nakamura, T.
Snoch, A.
Suzuki, D.
Sumikama, T.
Togano, Y.
Wang, R.
Rossi, D.
Yennello, S. J.
Otsu, H.
Kim, Y. J.
Ieki, K.
Zhang, Y.
Takeda, H.
McIntosh, A. B.
Tsang, C. Y.
Aumann, T.
Baba, H.
Brzychczyk, Janusz
Hong, B.
Murakami, T.
Łukasik, J.
Sochocka, Anna
Shane, R.
Xiao, Z. G.
Tsang, M. B.
Nakatsuka, N.
Fukuda, N.
Jhang, G.
Opis:
Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow (v$_{1}$), elliptic flow (v$_{2}$) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at 270 AMeV with the S$\pi$RIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, S$_{0}$, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, m$^{*}_{s}$/m$_{N}$, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, m$^{*}_{v}$/m$_{N}$ and the in-medium cross-section enhancement factor η. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT data suggest a narrow range of preferred values for m$^{*}_{s}$/m$_{N}$, m$^{*}_{v}$/m$_{N}$ and η.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Rapidity distributions of Z = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon
Autorzy:
Inabe, N.
Leifels, Y.
Shimizu, Y.
Chiga, N.
Törnqvist, H.
Lasko, P.
Horvat, A.
Kobayashi, T.
Gašparić, I.
Suzuki, H.
Pawłowski, P.
Sakurai, H.
Sato, H.
Xiao, Z.
Kurata-Nishimura, M.
Kaneko, M.
Santamaria, C.
Ono, A.
Scheit, H.
Isobe, T.
Manfredi, J.
Cerizza, G.
Estee, J.
Barney, J.
Yurkon, J.
Ichihara, T.
Lee, H. S.
Boretzky, K.
Ahn, D. S.
Morfouace, P.
Olsen, R.
Kondo, Y.
Atar, L.
Lee, J. W.
Lynch, W. G.
Nishimura, S.
Tangwancharoen, S.
Simon, H.
Nakamura, T.
Suzuki, D.
Sumikama, T.
Togano, Y.
Wang, R.
Rossi, D.
Yennello, S. J.
Otsu, H.
Kim, Y. J.
Ieki, K.
Zhang, Y.
Ikeno, N.
Takeda, H.
Pelczar, K.
McIntosh, A. B.
Tsang, C. Y.
Aumann, T.
Baba, H.
Brzychczyk, Janusz
Hong, B.
Murakami, T.
Łukasik, J.
Shane, R.
Tsang, M. B.
Nakatsuka, N.
Fukuda, N.
Jhang, G.
Opis:
The rapidity distributions of hydrogen isotopes emitted from central collisions of neutron-rich 132Sn+124Sn and neutron-deficient 108Sn+112Sn systems at 270 MeV/nucleon were investigated at RIKEN-RIBF. The data are compared with antisymmetrized molecular dynamics (AMD) calculations and the rapidity distributions can be reproduced after adjusting the in-medium nucleon-nucleon cross sections. The double ratios between the two reaction systems taken for the relative yields of deuteron to proton (d/p) and triton to proton (t/p) are further examined in the midrapidity domain, where the adjustments in the AMD calculations do not affect much on them. The d/p and t/p double ratios at midrapidity agree well with the ratio of the system neutron numbers and its squared value, respectively, and the rapidity dependence of these double ratios is consistent with a picture of partial mixing of colliding nuclei. By comparing with the AMD model which shows a strong symmetry energy dependence of the t/p double ratio, the experimental result in the midrapidity domain favors the calculation with a symmetry-energy slope parameter around L=46 MeV rather than L=108 MeV.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 69

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