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| 1 | Competition between fusion-evaporation and multifragmentation in central collisions in ^(58)Ni+^(48)Ca at 25A MeV显示文摘The experimental data concerning the58Ni+48Ca reaction at Elab(Ni)=25A MeV,collected by using the CHIMERA 4π device,have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions in the Fermi energy domain.As a main criterion for centrality selection we have chosen the flow angle(flow) method,making an event-by-event analysis that considers the shape of events,as it is determined by the eigenvectors of the experimental kinetic-energy tensor.For the selected central events(flow >60°) some global variables,good to characterize the pattern of central collisions have been constructed.The main features of the reaction products were explored by using different constraints on some of the relevant observables,like mass and velocity distributions and their correlations.Much emphasis was devoted,for central collisions,to the competition between fusion-evaporation processes with subsequent identification of a heavy residue and a possible multifragmentation mechanism of a well defined(if any) transient nuclear system.Dynamical evolution of the system and pre-equilibrium emission were taken into account by simulating the reactions in the framework of transport theories.Different approaches have been envisaged(dynamical stochastic BNV calculations + sequential SIMON code,QMD,CoMD,etc.).Preliminary comparison of the experimental data with BNV calculations shows reasonable agreement with the assumption of sequential multifragmentation emission in the mass region of IMFs close to the heavy residues.Possible deviations from sequential processes were found for those IMFs in the region of masses intermediate between the mass of heavy residues and the mass of light IMFs.Further simulations are in progress.The experimental analysis will be enriched also by information obtained inspecting the IMF-IMF correlation function,in order to elucidated the nature of space-time decay property of the emitting source associated with events having the largest IMF multiplicity. | FRANCALANZA L ABBONDANNO U AMORINI F BARLINI S BINI M BOUGAULT R BRUNO M CARDELLA G CASINI G AGOSTINO M D' De FILIPPO V De SANCTIS J GERACI E GIUSSANI A GRAMEGNA F GUIOT B KRAVCHUK V La GUIDARA E LANZALONE G Le NEINDRE N MAIOLINO C MARINI P MORELLI L OLMI A PAGANO A PAPA M PIANTELLI S PIRRONE S POLITI G POGGI G PORTO F RUSSOTTO P RIZZO F VANNINI G VANNUCCI L | 2013 | Nuclear Science and Techniques2013，24，5： | 2 |
| 2 | Animal transmissible spongiform encephalopathies and genetics 显示文摘 | AGRIMI U CONTE M MORELLI L | 2003 | Vet Res Commun2003，27，1： | 1 |
| 3 | Decomposition of M-ray CPM signals into PAM waveforms显示文摘 | Mengali U Morelli M | 1995 | IEEE Trans Information Theory1995，41，： | 1 |
| 4 | An Improved Frequency Offset Estimator for OFDM Applications 显示文摘 | Morelli M Mengali U | 1999 | IEEE Transactions on Communications1999，3，3： | 1 |
| 5 | Decomposition of M-ary CPM Signals into PAM Waveforms 显示文摘 | MENGALI U MORELLI M | 1995 | IEEE Transac- tions on Information Theory1995，41，05： | 1 |
| 6 | An improved frequency offset estimator for OFDM applications显示文摘 | Morelli M Mengali U | 1999 | Communications Letters IEEE1999，3，3： | 1 |
| 7 | Laparoscopic cholecystectomy for acute cholecystitis显示文摘 | Cirocchi R Del Sol A Morelli U | 2008 | G Chir2008，29，67： | 1 |
| 8 | An improved frequency offset esti- mator for OFDM applications显示文摘 | Morelli M Mengali U | 1999 | IEEE Communications Letters1999，3，3： | 1 |
| 9 | Joint Frequency and Timing Recovery for MSK- Type Modulation 显示文摘 | M Morelli U Mengali | 1998 | IEEE Communications Letters1998，47，6： | 1 |
| 10 | Data-aided frequency estimation for burst digital transmission显示文摘 | Mengaliv U Morelli M | 1997 | IEEE Trans Commun1997，45，1： | 1 |
| 11 | A comparison of pilotaided channel estimation methods for OFDM systems 显示文摘 | Morelli M Mengali U | 2001 | IEEE Transactions on Signal Process2001，49，12： | 1 |
| 12 | Channel estimation for adaptive frequency-domain equalization 显示文摘 | Morelli M Sanguinetti L and Mengali U | 2005 | IEEE Transactions on Wireless Communications2005，4，11： | 1 |
| 13 | An improved frequency offset estimator for OFDM显示文摘 | MORELLI M MENGALI U | 1999 | IEEE Commun Lett1999，3，3： | 1 |
| 14 | A Comparison of Pilct-aided Channel Estimation Methods for OFDM Systems 显示文摘 | MORELLI M MENGALI U | 2001 | IEEE Trans on Signal Processing2001，49，12： | 1 |
| 15 | An improved frequency offset estimation for OFDM applications显示文摘 | Morelli M Mengali U | 1999 | IEEE Commun Lett1999，3，3： | 1 |
| 16 | Data-aided frequency estimation for burst digital transmission显示文摘 | Mengali U Morelli M | 1997 | IEEE Trans on communications1997，45，1： | 1 |
| 17 | Data-aided frequency estimation for burst digital transmission 显示文摘 | MANGALI U MORELLI M | 1997 | IEEE Trans on Commun1997，45，1： | 1 |
| 18 | A comparison of pilot-aided channel estimation methods for OFDM systems 显示文摘 | Morelli M Mengali U | 2001 | IEEE Transactions on Signal Processing2001，49，12： | 1 |
| 19 | A Comparison of Pilot-aided Channel Estimation Methods for OFDM Systems 显示文摘 | Morelli M Eegali U | 2001 | IEEE Trans on Signal Processing2001，49，12： | 1 |
| 20 | Further resuits in carriefrequency estimation for transmissions over flat fading channels 显示文摘 | MORELLI M MENGALI U VITETTA G M | 1998 | IEEE Commun Lett1998，2，12： | 1 |
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