Engineering topics

Ono, A

Publications and source records attributed to Ono, A.

3 records

DOE OSTI2014

A way forward in the study of the symmetry energy: experiment, theory, and observation

The symmetry energy describes how the energy of nuclear matter rises as one goes away from equal numbers of neutrons and protons. This is very important to describe neutron rich matter in astrophysics. This article reviews our knowledge of the symmetry energy from theoretical calculations, nuclear structure measurements, heavy ion collisions, and astronomical observations. We then present a roadmap to make progress in areas of relevance to the symmetry energy that promotes collaboration between astrophysics and the nuclear physics communities.

Horowitz, Charles↗

DOE OSTI2010

Fragmentation paths in dynamical models

We undertake a quantitative comparison of multifragmentation reactions, as modeled by two different approaches: the antisymmetrized molecular dynamics (AMD) and the momentum-dependent stochastic mean-field (SMF) model. Fragment observables and pre-equilibrium (nucleon and light cluster) emission are analyzed, in connection with the underlying compression-expansion dynamics in each model. Considering reactions between neutron-rich systems, observables related to the isotopic properties of emitted particles and fragments are also discussed, as a function of the parametrization employed for the isovector part of the nuclear interaction. We find that the reaction path, particularly the mechanism of fragmentation, is different in the two models and reflects on some properties of the reaction products, including their isospin content. This should be taken into account in the study of the density dependence of the symmetry energy from such collisions.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗

DOE OSTI2010

Monopole oscillations in light nuclei with a molecular dynamics approach

Collective monopole vibrations are studied in the framework of an antisymmetrized version of molecular dynamics as a function of the vibration amplitude. The giant monopole resonance energy in {sup 40}Ca is sensitive to the incompressibility of the effective interaction, in good agreement with complete time-dependent Hartree-Fock calculations. The collective response of {sup 12}C, {sup 16}O, and {sup 24}Mg is also studied. For these lighter nuclei that have an important contribution of an {alpha}-clustered component, different frequencies are observed, corresponding to two different types of vibrations associated with breathing and moving of the underlying clusters. Possible connections with direct breakup into {alpha} clusters at high excitation energy are discussed.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗