Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 73: Nuclear Astrophysics
HK 73.4: Vortrag
Donnerstag, 19. März 2009, 17:30–17:45, H-ZO 60
Nuclear pasta with a touch of quantum — •Klaas Vantournhout, Natalie Jachowicz, and Jan Ryckebusch — Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
At densities of about 1014g/cm3, neutronrich matter arranges itself in a variety of complex shapes. It is suggested that these slab and rod-like structures, dubbed nuclear pasta, appear in the crust of neutron stars as well as in the centre of core-collapse supernovae, thereby influencing the dynamics of the process. For the study of these low-energy excitations, classical molecular dynamic techniques (CMD) are used [1,2].
Fermionic molecular dynamics (FMD), a formalism used to model nuclei and heavy-ion collisions, rises the description of nuclear matter to a quantum mechanical level by adding antisymmetrisation, spin, isospin and probability distributions to a CMD-like formalism [3]. The technique presented here is an extension of FMD to model bulk fermionic matter. Through the use of block-Toeplitz matrices and Jacobi-Theta functions it becomes feasible to describe infinite dimensional fermion systems [4]. In practice this is achieved by importing periodic boundary conditions into FMD giving rise to a quantum dynamical description of nuclear matter. Results illustrating the behaviour of free Fermi gases and alpha clustering will be presented.
[1] G. Watanabe et al., Phys. Rev. C 69, 055805 (2004).
[2] C.J. Horowitz et al., Phys. Rev. C 72, 035801 (2005).
[3] H. Feldmeier and J. Schnack, Rev. Mod. Phys 72, 655-688 (2000).
[4] K. Vantournhout et al. (in preparation)