Time sequence and time scale of intermediate mass fragment emission

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.044602· OSTI ID:20696074

De Filippo, E; Pagano, A; Cardella, G; Lanzano, G; Papa, M; Pirrone, S; Politi, G ^[1]; Wilczynski, J ^[2]; Amorini, F; Anzalone, A; Baran, V; Bonasera, A; Cavallaro, S; Colonna, M; Di Toro, M; Giustolisi, F; Iacono-Manno, M; La Guidara, E; Lanzalone, G; Maiolino, C ^[3]

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1. INFN, Sezione di Catania and Dipartimento di Fisica e Astronomia, Universita di Catania (Italy)
2. A. Soltan Institute for Nuclear Studies, Swierk/Warsaw (Poland)
3. INFN, Laboratori Nazionali del Sud and Dipartimento di Fisica e Astronomia, Universita di Catania (Italy); and others

Semiperipheral collisions in the {sup 124}Sn+{sup 64}Ni reaction at 35 MeV/nucleon were studied using the forward part of the Charged Heavy Ion Mass and Energy Resolving Array. Nearly completely determined ternary events involving projectilelike fragments (PLF), targetlike fragments (TLF), and intermediate mass fragments (IMF) were selected. A new method of studying the reaction mechanism, focusing on the analysis of the correlations between relative velocities in the IMF+PLF and IMF+TLF subsystems, is proposed. The relative velocity correlations provide information on the time sequence and time scale of the neck fragmentation processes leading to production of IMFs. It is shown that the majority of light IMFs are produced within 40-80 fm/c after the system starts to reseparate. Heavy IMFs are formed at times of about 120 fm/c or later and can be viewed as resulting from two-step (sequential) neck rupture processes.

• OSTI ID: 20696074
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CORRELATIONS
ION EMISSION
MEV RANGE
NICKEL 64 TARGET
NUCLEAR FRAGMENTATION
NUCLEAR FRAGMENTS
NUCLEAR REACTION KINETICS
TIN 124 REACTIONS