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Tytuł:
Isospin transport in $^{84}Kr+^{112,124}Sn$ collisions at Fermi energies
Autorzy:
Gruyer, D.
Barlini, S.
Morelli, L.
Frankland, J. D.
Bruno, M.
Vient, E.
Marchi, T.
Cinausero, M.
Le Neindre, N.
Twaróg, Tomasz
Bini, M.
Maurenzig, P. R.
Stefanini, A. A.
Maiolino, C.
Borderie, B.
Rivet, M. F.
Rosato, E.
Casini, G.
Chbihi, A.
Piantelli, S.
Carboni, S.
Bonnet, E.
Lopez, O.
Degerlier, M.
Pârlog, M.
Alba, R.
Pasquali, G.
Santonocito, D.
Spadaccini, G.
Poggi, G.
Vigilante, M.
Bougault, R.
Gramegna, F.
Olmi, A.
Kozik, Tomasz
Opis:
Isotopically resolved fragments with $Z_{\sim }^{< }20$ have been studied with a high-resolution telescope in a test run for the FAZIA Collaboration. The fragments were produced by the collision of a $^{84}Kr$ beam at 35 MeV/nucleon with a neutron-rich ($^{124}Sn$) and a neutron-poor ($ ^{112}Sn $ ) target. The fragments, detected close to the grazing angle, are mainly emitted from the phase-space region of the projectile. The fragment isotopic content clearly depends on the neutron richness of the target and this is direct evidence of isospin diffusion between projectile and target. The observed enhanced neutron richness of light fragments emitted from the phase-space region close to the center of mass of the system can be interpreted as an effect of isospin drift in the diluted neck region.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Isospin transport in ^{84}Kr + ^{112,124}Sn reactions at Fermi energies : first physics results from FAZIA
Autorzy:
Gruyer, D.
Morelli, L.
Frankland, J. D.
Bruno, M.
Vient, E.
Marchi, T.
Cinausero, M.
Le Neindre, N.
Twaróg, Tomasz
Bini, M.
Maurenzig, P. R.
Stefanini, A. A.
Maiolino, C.
Borderie, B.
Rivet, M. F.
Casini, G.
Chbihi, A.
Piantelli, S.
Carboni, S.
Bonnet, E.
Lopez, O.
Degerlier, M.
Pârlog, M.
Alba, R.
Pasquali, G.
Rosato, G.
Santonocito, D.
Spadaccini, G.
Poggi, G.
Vigilante, M.
Bougault, R.
Barlinig, S.
Gramegna, F.
Olmi, A.
Kozik, Tomasz
Opis:
The FAZIA Collaboration studied collisions of a ^{84}Kr beam at 35 AMeV with ^{112}Sn and ^{124}Sn targets by means of a three-layer telescope. A good isotopic resolution up to Z = 20 was reached. The isotopic content of the products was found to depend on the neutron richness of the target, which is an evidence of isospin diffusion. Neutron-rich light fragments emitted from the phase space close to the centre-of-mass were observed, which can be interpreted as an effect of isospin drift in the neck region of low density.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Isospin transport in $^{84}Kr+^{112,124}Sn$ reactions at Fermi energies
Autorzy:
Gruyer, D.
Barlini, S.
Morelli, L.
Frankland, J. D.
Bruno, M.
Vient, E.
Marchi, T.
Cinausero, M.
Le Neindre, N.
Twaróg, Tomasz
Bini, M.
Maurenzig, P. R.
Parlog, M.
Stefanini, A. A.
Maiolino, C.
Borderie, B.
Rivet, M. F.
Rosato, E.
Casini, G.
Chbihi, A.
Piantelli, S.
Carboni, S.
Bonnet, E.
Lopez, O.
Degerlier, M.
Alba, R.
Pasquali, G.
Santonocito, D.
Spadaccini, G.
Poggi, G.
Vigilante, M.
Bougault, R.
Gramegna, F.
Olmi, A.
Kozik, Tomasz
Opis:
Isospin transport phenomena in dissipative heavy ion collisions have been investigated at Fermi energies with a beam of $^{8}Kr$ at 35AMeV. A comparison of the $\left \langle N \right \rangle /Z$ of light and medium products forward-emitted in the centre of mass frame when the beam impinges on two different targets, the n-poor $^{112}Sn$ and the n-rich $^{124}Sn$, is presented. Data were collected by means of a three-layer telescope with very good performances in terms of mass identification (full isotopic resolution up to Z $\sim$ 20 for ions punching through the first detector layer) built by the FAZIA Collaboration and located just beyond the grazing angle for both reactions. The $\left \langle N \right \rangle /Z$ of the products detected when the n-rich target is used is always higher than that associated to the n-poor one; since the detector was able to measure only fragments coming from the QuasiProjectile decay and/or neck emission, the observed behaviour can be ascribed to the isospin diffusion process, driven by the isospin gradient between QuasiProjectile and QuasiTarget. Moreover, for light fragments the $\left \langle N \right \rangle /Z$ as a function of the lab velocity of the fragment is observed to increase when we move from the QuasiProjectile velocity to the centre of mass (neck zone). This effect can be interpreted as an evidence of isospin drift driven by the density gradient between the QuasiProjectile zone (at normal density) and the more diluted neck zone.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
N and Z odd-even staggering in Kr+Sn collisions at Fermi energies
Autorzy:
Gruyer, D.
Barlini, S.
Morelli, L.
Frankland, J. D.
Bruno, M.
Vient, E.
Marchi, T.
Cinausero, M.
Le Neindre, N.
Twaróg, Tomasz
Bini, M.
Maurenzig, P. R.
Stefanini, A. A.
Maiolino, C.
Borderie, B.
Rivet, M. F.
Rosato, E.
Casini, G.
Chbihi, A.
Piantelli, S.
Carboni, S.
Bonnet, E.
Lopez, O.
Valdrè, S.
Degerlier, M.
Pârlog, M.
Alba, R.
Pasquali, G.
Santonocito, D.
Spadaccini, G.
Poggi, G.
Vigilante, M.
Bougault, R.
Gramegna, F.
Olmi, A.
Kozik, Tomasz
Opis:
The odd-even staggering of the yield of final reaction products has been studied as a function of proton (Z) and neutron (N) numbers for the collisions $^{84}Kr+^{112}Sn$ and $^{84}Kr+^{124}Sn$ at 35 MeV/nucleon in a wide range of elements ( up to $Z\approx 20$ ). The experimental data show that staggering effects rapidly decrease with increasing size of the fragments. Moreover the staggering in N is definitely larger than the one in Z. Similar general features are qualitatively reproduced by the $_{GEMINI}$ code. Concerning the comparison of the two systems, the staggering in N is in general rather similar, being slightly larger only for the lightest fragments produced in the n-rich system. In contrast the staggering in Z, although smaller than that in N, is sizably larger for the n-poor system with respect to the n-rich one.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Isospin transport in $^{84}Kr+^{112,124}Sn$ collisions at fermi energies with the FAZIA detector
Autorzy:
Piantelli, S.
Gramegna, F.
Casini, G.
Twaróg, Tomasz
Santonocito, D.
Le Neindre, N.
Barlini, S.
Poggi, G.
Vigilante, M.
Parlog, M.
Bonnet, E.
Bougault, R.
Alba, R.
Carboni, S.
Olmi, A.
Bruno, M.
Maurenzig, P. R.
Bini, M.
Stefanini, A. A.
Lopez, O.
Marchi, T.
Morelli, L.
Frankland, J. D.
Spadaccini, G.
Cinausero, M.
Rosato, E.
Rivet, M. F.
Maiolino, C.
Chbihi, A.
Scarlini, E.
Vient, E.
Pasquali, G.
Degerlier, M.
Gruyer, D.
Borderie, B.
Kozik, Tomasz
Opis:
Isotopically resolved fragments up to $Z\approx 20$ have been studied in a test experiment by the FAZIA Collaboration with a three-stage telescope. The reactions $^{84}Kr+^{112}Sn$ (n-poor) and $^{84}Kr+^{124}Sn$ (n-rich) at 35 MeV/nucleon were measured. The telescope was located near the grazing angle, so the detected fragments are mainly emitted from the phase-space region of the projectile. In the following, evidences for isospin diffusion and drift will be discussed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Isotopic identification using Pulse Shape Analysis of current signals from silicon detectors : recent results from the FAZIA collaboration
Autorzy:
Kordyasz, A.
Gruyer, D.
Barlini, S.
Morelli, L.
Pastore, G.
Frankland, J. D.
Bruno, M.
Vient, E.
Le Neindre, N.
Bini, M.
Valdré, S.
Stefanini, A. A.
Borderie, B.
Henri, M.
Casini, G.
Verde, G.
Fabris, D.
Chbihi, A.
Piantelli, S.
Bonnet, E.
Lopez, O.
Lombardo, I.
Pârlog, M.
Alba, R.
Pasquali, G.
Ottanelli, P.
Santonocito, D.
Dueñas, J. A.
Poggi, G.
Vigilante, M.
Bougault, R.
Francalanza, L.
Gramegna, F.
Olmi, A.
Kozik, Tomasz
Dell'Aquila, D.
Opis:
The FAZIA apparatus exploits Pulse Shape Analysis (PSA) to identify nuclear fragments stopped in the first layer of a Silicon-Silicon-CsI(Tl) detector telescope. In this work, for the first time, we show that the isotopes of fragments having atomic number as high as Z∼20 can be identified. Such a remarkable result has been obtained thanks to a careful construction of the Si detectors and to the use of low noise and high performance digitizing electronics. Moreover, optimized PSA algorithms are needed. This work deals with the choice of the best algorithm for PSA of current signals. A smoothing spline algorithm is demonstrated to give optimal results without requiring too much computational resources.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The european FAZIA initiative : a high-performance digital telescope array for heavy-ion studies
Autorzy:
Spadaccini, G.
Cinausero, M.
Stefanini, A.
Vigilante, M.
Barlini, S.
Poggi, G.
Rivet, M. F.
Bougault, R.
Guerzoni, M.
Twaróg, Tomasz
Piantelli, S.
Ordine, A.
Pasquali, G.
Olmi, A.
Vient, E.
Gruyer, D.
Pârlog, M.
Rosato, E.
Borderie, B.
Lopez, O.
Le Neindre, N.
Carboni, S.
Valdré, S.
Chbihi, A.
Gramegna, F.
Kordjasz, A.
Bruno, M.
Degerlier, M.
Salomon, F.
Morelli, L.
Pastore, G.
Marini, P.
Bonnet, E.
Edelbruck, P.
Frankland, J. D.
Marchi, T.
Bini, M.
Casini, G.
Kozik, Tomasz
Opis:
The european Fazia collaboration aims at building a new modular array for charged product identification to be employed for heavy-ion studies. The elementary module of the array is a Silicon-Silicon-CsI telescope, optimized for ion identification including pulse shape analysis, too. The achievement of top performances imposes specific electronics which has been developed by the FAZIA collaboration and includes high quality charge and current preamplifiers, coupled to fully digital front-end. During the initial R&D phase, original and novel solutions have been tested in prototypes, obtaining unprecedented ion identification capabilities. FAZIA is now constructing a demonstrator array consisting of about two hundreds telescopes arranged in a compact and transportable configuration. In this contribution, we mainly summarize some aspects studied by FAZIA to improve the ion identification. Then we will briefly discuss the FAZIA program focused on experiments to be done with the demonstrator. First results on the isospin dynamics obtained with a reduced set-up demonstrate well the performance of the telescope and represent a good starting point towards future investigations with both stable and exotic beams.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Wyświetlanie 1-10 z 50

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