Abstract
The distribution of relative angles between the intermediate mass fragments has been measured and analyzed for thermal multifragmentation in p + Au collisions at 2.1, 3.6 and 8.1 GeV. The analysis has been done on an event by event basis. The multibody Coulomb trajectory calculations of all charged particles have been performed starting with the initial break-up conditions given by the combined model with the revised intranuclear cascade (INC) followed by the statistical multifragmentation model. The measured correlation function was compared with the calculated one to find the actual time scale of the intermediate mass fragment (IMF) emission. It found transition from sequential evaporation for p(2.1 GeV) + Au to simultaneous multibody decay of a hot and expanded nuclear system in case of p(8.1 GeV) + Au.
Highlights
The main decay mode of very excited nuclei (E* ≥ 4 MeV/nucleon) is copious emission of intermediate mass fragments (IMF), which are heavier than -particles but lighter than fission fragments
The first measurements of the time scale for the thermal multifragmentation were performed for 4He + Au collisions at 14.6 GeV by analyzing the IMF-IMF relative angle correlation [3,4]
We used a refined version of the intranuclear cascade model (INC) [9] to get the N, Z and the excitation energy distributions of the target spectators
Summary
The main decay mode of very excited nuclei (E* ≥ 4 MeV/nucleon) is copious emission of intermediate mass fragments (IMF), which are heavier than -particles but lighter than fission fragments. The time scale of fragment emission is a key parameter for understanding the decay mechanism of highly excited nuclei. According to [2], τc is estimated to be (400 - 500) fm·c−1 Fragments emitted within this time interval are considered being not independent as they interact via the Coulomb force while being accelerated in the electric field of the source. The yield of events with small relative velocities of the fragments (or small relative angles between them) is suppressed The magnitude of this effect drastically depends on the emission time since the longer the time separation of the. The first measurements of the time scale for the thermal multifragmentation were performed for 4He + Au collisions at 14.6 GeV by analyzing the IMF-IMF relative angle correlation [3,4]. The angle correlations of intermediate mass fragments have been studied for p + Au collisions at 2.1, 3.6 and 8.1 GeV
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