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Wyświetlanie 1-10 z 15
Tytuł:
Freeze-out configuration properties in the ^{197}Au+^{197}Au reaction at 23A MeV
Autorzy:
Grzeszczuk, A.
Kowalski, S.
Lanzalone, G.
Siwek-Wilczyńska, K.
Majka, Zbigniew
Nicolis, N. G.
Piasecki, E.
Płaneta, Roman
Auditore, L.
Skwira-Chalot, I.
Trifiro, A.
Trimarchi, M.
Cap, T.
Politi, G.
Zipper, W.
Wilczyński, J.
Cardella, G.
Najman, Rafał
Lombardo, I.
Pagano, A.
De Filippo, E.
Pirrone, S.
Sochocka, Anna
Russotto, P.
Geraci, E.
Amorini, F.
Rizzo, F.
Kozik, Tomasz
Opis:
Data from an experiment on the ^{197}Au+^{197}Au reaction at 23AMeV are analyzed with an aim to find signatures of exotic nuclear configurations such as toroid-shaped objects. The experimental data are compared with predictions of the etna code, dedicated to look for such configurations, and with the quantum molecular dynamics (QMD) model. A novel criterion of selecting events possibly resulting from the formation of exotic freeze-out configurations, "the efficiency factor", is tested. Comparison between experimental data and model predictions may indicate the formation of flat and/or toroidal nuclear systems.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Investigation of the freeze-out configuration in the ^{197}Au + ^{197}Au reaction at 23 A MeV
Autorzy:
Pirrone, S.
Russotto, P.
Sochocka, Anna
Cardella, G.
Auditore, L.
Grzeszczuk, A.
Trifiro, A.
Piasecki, E.
Trimarchi, M.
Płaneta, Roman
Skwira-Chalot, I.
Zipper, W.
Siwek-Wilczyńska, K.
Wilczyński, J.
Lombardo, I.
Geraci, E.
De Filippo, E.
Majka, Zbigniew
Rizzo, F.
Amorini, F.
Cap, T.
Kowalski, S.
Nicolis, N. G.
Pagano, A.
Politi, G.
Najman, Rafał
Lanzalone, G.
Kozik, Tomasz
Opis:
According to the model predictions, observation of toroidal objects is expected in collisions of heavy ion at low incident energies. Comparison between experimental data and model predictions which may indicate the formation of flat/toroidal nuclear systems is shown.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Aligned ternary partitioning of the ^{197}Au+^{197}Au system at 23 A MeV beam energy
Autorzy:
Grzeszczuk, A.
Lanzalone, G.
Siwek-Wilczyńska, K.
Nicolis, N. G.
Piasecki, E.
Płaneta, Roman
Auditore, L.
Papa, M.
Skwira-Chalot, I.
Trimarchi, M.
Cap, T.
Politi, G.
Verde, G.
Wilczyński, J.
Zipper, W.
Cardella, G.
Najman, Rafał
Grassi, L.
Lombardo, I.
Pagano, A.
Han, J.
De Filippo, E.
Pirrone, S.
Russotto, P.
La Guidara, E.
Geraci, E.
Trifirò, A.
Amorini, F.
Rizzo, F.
Kozik, Tomasz
Opis:
Ternary partitions of the ^{197}Au+^{197}Au system in collisions at 23 A MeV beam energy have been studied. It is observed that the mass number distribution of the lightest fragments, called intermediate mass fragments (IMF), extends up to mass numbers corresponding to partitions into three comparable fragments. The lightest IMFs of A_{IFM} < 20 show well known features of prompt emission originating from the interaction zone (neck) during reseparation. Heavier IMFs (of A_{IFM} > 30) definitely originate from sequential (but not equilibrated) decay of the primary projectile-like fragments (PLF*) (or target-like fragments (TLF*)). The decaying system evidently keeps memory of the neck configuration and consequently the IMFs are emitted collinearly either from the neck side or from the opposite side along the separation axis (polar emission). The new intriguing process of the polar emission dominates for IMFs of A_{IMF} > 50.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Determination of impact parameters in aligned breakup of projectile-like fragments in ^{197}Au + ^{197}Au collisions at 23A MeV
Autorzy:
Płaneta, Roman
Wilczyński, J.
Lombardo, I.
Han, J.
Pirrone, S.
Papa, M.
Trimarchi, M.
Lanzalone, G.
Russotto, P.
Politi, G.
La Guidara, E.
Grassi, L.
De Filippo, E.
Geraci, E.
Najman, Rafał
Amorini, F.
Skwira-Chalot, I.
Grzeszczuk, A.
Nicolis, N. G.
Piasecki, E.
Pagano, A.
Auditore, L.
Trifirò, A.
Rizzo, F.
Zipper, W.
Cap, T.
Cardella, G.
Siwek-Wilczyńska, K.
Verde, G.
Kozik, Tomasz
Opis:
Symmetric and asymmetric aligned breakup of projectile-like fragments in ^{197}Au + ^{197}Au collisions at 23A MeV was studied. Independently of the asymmetry, the reaction yields have been found peaked at a common, very narrow range of impact parameters.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Probing the symmetry energy at low density using observable from neck fragmentation
Autorzy:
Pirrone, S.
Grassi, L.
Baran, V.
Russotto, P.
Cardella, G.
Papa, M.
Auditore, L.
Grzeszczuk, A.
Trifirò, A.
Porto, F.
Piasecki, E.
Vigilante, M.
Colonna, M.
Acosta, L.
Zetta, L.
Trimarchi, M.
Minniti, T.
Guazzoni, P.
Płaneta, Roman
Skwira-Chalot, I.
Maiolino, C.
Siwek-Wilczyńska, K.
Rosato, E.
Wilczyński, J.
Lombardo, I.
Pop, A.
Agodi, C.
Geraci, E.
De Filippo, E.
Berceanu, I.
Gianì, R.
Rizzo, F.
Amorini, F.
Pagano, E. V.
Cap, T.
Verde, G.
Pagano, A.
Francalanza, L.
Politi, G.
La Guidara, E.
Han, J.
Lanzalone, G.
Quattrocchi, L.
Opis:
Semi-peripheral collisions of ^{64}Ni + ^{124}Sn in direct and inverse kinematics, at 35 A MeV incident energy, are studied to characterize the dynamical origin and align-ments properties of fragments emission at midrapidity. This emission is partly due to the fragmentation of a transient neck joining the projectile and target in the early stages of the reaction. Recently we exploited observable from neck fragmentation to constraint the density dependence of the symmetry energy. In this contribution we focus on the density evolution of the mid-rapidity source. An experimental survey is suggested to check if data are consistent with the formation of neck fragments in a dilute density region in contact with the projectile-like and target-like spectators at normal saturation density.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Correlations between emission timescale of fragments and isospin dynamics in ^{124}Sn+^{64}Ni and ^{112}Sn+^{58}Ni reactions at 35A MeV
Autorzy:
Lombardo, I.
Le Neindre, N.
D'Agostino, M.
Anzalone, A.
Wieleczko, J. P.
De Filippo, E.
Verde, G.
Gawlikowicz, W.
Vigilante, M.
Pop, A.
Lanzalone, G.
Bougault, R.
Skwira-Chalot, I.
Trimarchi, M.
Lanzanò, G.
Cavallaro, S.
Amorini, F.
Bruno, M.
Pagano, A.
Chatterjee, M. B.
Di Toro, M.
Frankland, J.
Pirrone, S.
Rizzo, F.
Geraci, E.
Wilczyński, J.
Płaneta, Roman
Auditore, L.
Galichet, E.
Porto, F.
Zipper, W.
Politi, G.
Cap, T.
La Guidara, E.
Russotto, P.
Berceanu, I.
Rosato, E.
Maiolino, C.
Rivet, M. F.
Chbihi, A.
Cardella, G.
Papa, M.
Schmidt, K.
Kowalski, S.
Zetta, L.
Siwek-Wilczyńska, K.
Trifirò, A.
Dayras, R.
Colonna, M.
Piasecki, E.
Borderie, B.
Guazzoni, P.
Baran, V.
Grzeszczuk, A.
Opis:
We present a new experimental method to correlate the isotopic composition of intermediate mass fragments (IMF) emitted at midrapidity in semiperipheral collisions with the emission timescale: IMFs emitted in the early stage of the reaction show larger values of ⟨N/Z⟩ isospin asymmetry, stronger angular anisotropies, and reduced odd-even staggering effects in neutron to proton ratio ⟨N/Z⟩ distributions than those produced in sequential statistical emission. All these effects support the concept of isospin “migration”, that is sensitive to the density gradient between participant and quasispectator nuclear matter, in the so called neck fragmentation mechanism. By comparing the data to a stochastic mean field (SMF) simulation we show that this method gives valuable constraints on the symmetry energy term of nuclear equation of state at subsaturation densities. An indication emerges for a linear density dependence of the symmetry energy.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 15

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