Competition between fusion-evaporation and multifragmentation in central collisions in 58Ni+48Ca at 25A MeV

doi:10.13538/j.1001-8042/nst.2013.05.016

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (5): 050516 doi: 10.13538/j.1001-8042/nst.2013.05.016

Special Issue: Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2012)

• Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2012) • Previous Articles Next Articles

Competition between fusion-evaporation and multifragmentation in central collisions in ⁵⁸Ni+⁴⁸Ca at 25A MeV

FRANCALANZA ^1,2,* ABBONDANNO U³ AMORINI F^1,2 BARLINI S⁴ BINI M⁴ BOUGAULT R⁵ BRUNO M⁶ CARDELLA G⁷ CASINI G⁸ AGOSTINO M D’⁶ De FILIPPO V⁷ De SANCTIS J⁶ GERACI E^2,7 GIUSSANI A⁹ GRAMEGNA F¹⁰ GUIOT B⁶ KRAVCHUK V¹⁰ La GUIDARA E¹¹ LANZALONE G^1,12Le NEINDRE N⁵ MAIOLINO C¹ MARINI P⁶ MORELLI L⁶ OLMI A⁸PAGANO A⁷ PAPA M⁷ PIANTELLI S⁸ PIRRONE S⁷ POLITI G^2,7 POGGI G⁴#br# PORTO F^1,2 RUSSOTTO P^1,2 RIZZO F^1,2 VANNINI G⁶ VANNUCCI L¹⁰

¹INFN Laboratori Nazionali del Sud-LNS, Catania 95123, Italy
²Dipartimento di Fisica, Università di Catania I-95129, Italy
³INFN Sezione di Trieste, Trieste I-34127, Italy
⁴Dipartimento di Fisica, Università di Firenze, INFN Sezione di Firenze 1-50139, Italy
⁵LPC Caen, IN2P3-CNRS/ENSICAEN and Université, F-14050 Caen cedex 5-14076, France
⁶Dipartimento di Fisica, Università di Bologna and INFN Sezione di Bologna4-50121, Italy
⁷INFN Sezione di Catania I-95129, Italy
⁸INFN Sezione di Firenze I-50139, Italy
⁹Dipartimento di Fisica, Università di Milano and INFN Sezione di Milano1-20126, Italy
¹⁰INFN Laboratori Nazionali di Legnaro 1-35020, Italy
¹¹Centro Siciliano di Fisica Nucleare e Struttura della Materia, Catania 1-95129, Italy
¹²Università Kore, Enna 1-94100, Italy

Received:2013-06-27
Contact: FRANCALANZA L E-mail: laura.francalanza@ct.infn.it

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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. Competition between fusion-evaporation and multifragmentation in central collisions in ⁵⁸Ni+⁴⁸Ca at 25A MeV.Nuclear Science and Techniques, 2013, 24(5): 050516 doi: 10.13538/j.1001-8042/nst.2013.05.016

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Abstract

Abstract:

The experimental data concerning the ⁵⁸Ni+⁴⁸Ca reaction at E_lab(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.

Key words: Heavy ion collisions, Intermediate energy, Flow angle, Fusion-evaporation, Multifragmentation

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Competition between fusion-evaporation and multifragmentation in central collisions in ⁵⁸Ni+⁴⁸Ca at 25A MeV

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