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Tytuł:
FARCOS detector in the CHIFAR experiment
Autorzy:
Fichera, F.
Risitano, F.
Lanzalone, G.
Zagami, C.
Acosta, L.
Siwek-Wilczynska, K.
Guazzoni, C.
Płaneta, Roman
Papa, M.
Piscopo, M.
Maiolino, C.
Skwira-Chalot, I.
Trimarchi, M.
Cap, T.
Politi, G.
Cardella, G.
Pagano, E. V.
Filippo, E. de
Pagano, A.
Gnoffo, B.
Piasecki, K.
Matulewicz, T.
Martorana, N. S.
Pirrone, S.
Russotto, P.
Geraci, E.
Opis:
The CHIFAR experiment, carried out at Laboratori Nazionali del Sud-INFN (INFN-LNS), was proposed to investigate the emission probability of Intermediate Mass Fragments (IMFs) in non-central Heavy Ion (HI) collisions, focusing also on the role of the Isospin degree of freedom of the colliding nuclei. The results of the energy calibration, resolution and particle identification phase of FARCOS correlator used in the CHIFAR experiment are reported.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The pixelation technique applied to FARCOS correlator in the CHIFAR experiment
Autorzy:
Fichera, F.
Risitano, F.
Lanzalone, G.
Zagami, C.
Acosta, L.
Santagati, G.
Siwek-Wilczynska, K.
Guazzoni, C.
Płaneta, Roman
Papa, M.
Piscopo, M.
Maiolino, C.
Skwira-Chalot, I.
Trimarchi, M.
Cap, T.
Politi, G.
Cardella, G.
Pagano, E. V.
Saccà, G.
Pagano, A.
Gnoffo, B.
Piasecki, K.
Matulewicz, T.
Martorana, N. S.
De Filippo, E.
Pirrone, S.
Russotto, P.
Geraci, E.
Rizzo, F.
Opis:
The CHIFAR experiment, carried out at Laboratori Nazionali del Sud-INFN (INFN-LNS), was proposed to investigate the emission probability of Intermediate Mass Fragments (IMFs) in non-central Heavy Ion (HI) collisions. The aim was the study of the features of the Equation of State of the nuclear matter, focusing also on the role of the isospin degree of freedom of the colliding nuclei. The CHIMERA Collaboration has investigated at the incident beam energy of 20 AMeV some nuclear reactions including: $^{124}$Sn + $^{64}$Ni, $^{112}$Sn + $^{58}$Ni and $^{124}$Xe + $^{64}$Zn. The experimental setup was equipped with ten telescopes of the FARCOS (Femtoscope ARray for COrrelation and Spectroscopy) correlator in its final configuration, coupled with the 4$\pi$ CHIMERA multi-detector allowing the study of correlations among IMFs and light charged particles produced in a nuclear reaction. The results on the energy calibration, on the energy resolution and on the particle identification phase of the FARCOS correlator used in the CHIFAR experiment are reported. The so-called "pixelation technique" is the last step of the analysis explained here.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Latest results of data analysis related to FARCOS correlator in the CHIFAR experiment
Autorzy:
Santagati, G.
De Filippo, E.
Piasecki, K.
Lanzalone, G.
Martorana, N. S.
Piscopo, M.
Skwira-Chalot, I.
Trimarchi, M.
Siwek-Wilczynska, K.
Risitano, F.
Pagano, A.
Guazzoni, C.
Pirrone, S.
Rizzo, F.
Geraci, E.
Płaneta, Roman
Politi, G.
Acosta, L.
Cap, T.
Russotto, P.
Fichera, F.
Gnoffo, B.
Maiolino, C.
Pagano, E. V.
Cardella, G.
Papa, M.
Zagami, C.
Saccà, G.
Matulewicz, T.
Opis:
The CHIFAR experiment, carried out at Laboratori Nazionali del Sud-INFN, aims to study the reaction mechanisms and Intermediate Mass Fragments (IMFs) emission probability in non-central Heavy-Ion collisions. These phenomena are linked to the features of the Equation of State of the nuclear matter, and shine light also on the role of the isospin degree of freedom of the colliding nuclei. In the CHIFAR experiment, nuclear reactions at incident beam energy of 20 AMeV were investigated using different combinations of beams: $^{124}$Sn, $^{112}$Sn and $^{124}$Xe, and targets: $^{64}$Ni, $^{58}$Ni and $^{64}$Zn, in order to study combinations of neutron-rich and neutron-poor systems. The experimental setup was equipped with ten telescopes of the FARCOS correlator, coupled with the 4π CHIMERA multi-detector. This coupling allowed the study of the correlations between IMFs and light charged particles emitted in a nuclear reaction. The results on the energy calibration, on the energy resolution and on the identification of the detected particles by FARCOS correlator used in the CHIFAR experiment are explained. Some preliminary results regarding the physics cases studied in the experiment are also reported.
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
Tytuł:
Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in ^{124}Sn + ^{64}Ni and ^{112}Sn + ^{58}Ni collisions at 35A MeV
Autorzy:
Lanzanò, G.
Grzeszczuk, A.
Kowalski, S.
Berceanu, I.
Lanzalone, G.
Siwek-Wilczyńska, K.
Acosta, L.
Wieleczko, J. P.
Bruno, M.
Gawlikowicz, W.
Minniti, T.
Guazzoni, P.
Le Neindre, N.
Baran, V.
Piasecki, E.
Płaneta, Roman
D'Agostino, M.
Auditore, L.
Papa, M.
Maiolino, C.
Di Toro, M.
Cavallaro, S.
Borderie, B.
Rivet, M. F.
Schmidt, K.
Chatterjee, M. B.
Skwira-Chalot, I.
Trimarchi, M.
Cap, T.
Politi, G.
Rosato, E.
Verde, G.
Wilczyński, J.
Chbihi, A.
Zipper, W.
Cardella, G.
Pagano, E. V.
Rizzo, F.
Pagano, A.
Lombardo, I.
Colonna, M.
Gnoffo, B.
Porto, F.
De Filippo, E.
Pirrone, S.
Galichet, E.
Frankland, J.
Zetta, L.
Russotto, P.
Geraci, E.
Bougault, R.
Trifirò, A.
Vigilante, M.
Francalanza, L.
Quattrocchi, L.
Opis:
Background: In heavy-ion collisions at intermediate energies the production of light charged particles and intermediate mass fragments (IMFs) is due to different reaction mechanisms and different time scales, ranging from fast dynamical processes to statistical emission from the equilibrated system. Purpose: We compare the IMF statistical and dynamical emission probabilities in collisions of a neutron-rich ^{124}Sn + ^{64}Ni system and a neutron-poor ^{112}Sn + ^{58}Ni system at the laboratory energy of 35 A MeV. Method: The IMFs production mechanism in semiperipheral reactions has been investigated in our previous works. In this paper, the analysis is expanded for the same set of data and production cross sections have been evaluated for dynamical and statistical emission in a coherent way for light and heavy fragments. Results: The data analysis has evidenced a strong competition between dynamical and statistical emission mechanisms. Probability of the dynamical emission of IMFs is strongly influenced by the (N/Z) ratio of the colliding system. Conclusions: It is demonstrated that the statistical emission is equally probable for the two systems, while the dynamical emission is enhanced for the neutron-rich system, especially for heavy fragments (Z≥6). The observed effect points at a high sensitivity of the prompt-dynamical emission to the (N/Z) ratio of a given system.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 20

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