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Constraining the symmetry energy from experimental primary fragment distributions

Abstract : Heavy ion collisions are a versatile and powerful tool to investigate both dynamic and thermodynamic features of excited nuclei and nuclear matter and to have an insight into the structure of exotic nuclei. In this talk we will concentrate on the dynamical and thermodynamical properties of excited nuclei, which are strongly influenced by a fundamental property of nuclear matter: the nuclear equation of state (EOS). Despite its importance, strong uncertainties and a significant model-dependence still affect the available parametrizations of the EOS. In particular, experimental constraints are highly needed on the term of the EOS dependent of the difference between the number of neutrons and protons of the system. The determination of such term, commonly referred to as symmetry energy, is strongly affected by the secondary decay to which the fragments produced in the analysed reactions undergo before being detected. Attempts to correct for this effect rely on the use of statistical decay models. We will present the results on the 40,48Ca+40,48 Ca experiment performed at GANIL, coupling the VAMOS spectrometer to the 4pi charged particle array INDRA. The isotopic distributions of fragments before their decay are, for the first time, extracted experimentally, on an event-by-event basis, and compared to the statistical decay code GEMINI. Robust observables for the extraction of the symmetry energy are then identified.
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http://hal.in2p3.fr/in2p3-00840085
Contributor : Michel Lion <>
Submitted on : Monday, July 1, 2013 - 2:56:49 PM
Last modification on : Thursday, February 1, 2018 - 1:35:38 AM

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  • HAL Id : in2p3-00840085, version 1

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P. Marini. Constraining the symmetry energy from experimental primary fragment distributions. EURISOL Topical Meeting 2013 "Going to the limits of mass, spin, and isospin with heavy Radioactive Ion Beams", Jul 2013, Krakow, Poland. ⟨in2p3-00840085⟩

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