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Investigation of isotope composition of nuclear fragments with angular momentum and Coulomb effects in peripheral ^(84)Kr+ ^(112,124)sn collisons at 35 A MeV

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Nuclear science and Techniques 2015年第2期26卷 111-116页

作者： Nihal Buyukcizmeci Aysegul Ergun Hamide Imal Riza Ogul alexander s botvina Department of Physics University of Seluk Institute for Nuclear Research Russian Academy of Sciences Frankfurt Institute for Advanced studies J.W. Goethe University

New theoretical calculations are performed to investigate the Coulomb proximity and angular momentum effects on multifragmentation picture for84Kr+112,124 sn collisions at an incident beam energy of 35 Me V/*** and isotopic distributions and the mean neutron-to-proton ratios of the fragments are reproduced within the microcanonical Markov chain calculations on the basis of statistical Multifragmentation Model. It is shown that the Coulomb interactions and angular momentum effects are very important to reproduce isotopic composition of nuclear fragments in peripheral heavy-ion collisions at Fermi energies. Our results imply that it is possible to investigate in laboratories the modification of structure parameters of fragments, such as the symmetry energy coefficient, at subnuclear densities in dense environment of other species.

关键词：同位素组成库仑作用角动量核碎片 MeV 重离子碰撞库仑相互作用多重碎裂

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From sequential Processes to Multifragmentation in Proton Reactions with Gold

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Journal of Modern Physics 2013年第11期4卷 1504-1507页

作者： sergej P. Avdeyev Victor A. Karnaukhov Helmut Oeschler Waldemar Karcz Vahan V. Kirakosyan Pavel A. Rukoyatkin Edwin Norbeck alexander s. botvina H. Niewodniczanski Institute of Nuclear Physics Cracow Poland Institute for Nuclear Research Moscow Russia Institute für Kernphysik Darmstadt University of Technology Darmstadt Germany Joint Institute for Nuclear Research Dubna Russia University of Iowa Iowa City USA

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.

关键词： Multifragmentation Correlations Emission

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