0000000000826033
AUTHOR
Stefano Fantoni
STABILITY AND SPECTRA OF SMALL 3He-4He CLUSTERS
Diffusion Monte Carlo calculations have been systematically performed to analyze the stability of small mixed 3 He -4 He clusters, as well as their excitation spectra. The picture that emerges is that of systems with strong shell effects whose binding and excitation energies are essentially determined by the monopole properties of an effective Hamiltonian.
Excitation spectra of aHe3impurity onHe4clusters
The diffusion Monte Carlo technique is used to calculate and analyze the excitation spectrum of a single $^{3}\mathrm{He}$ atom bound to a cluster with $N$ $^{4}\mathrm{He}$ atoms, with the aim of establishing the most adequate filling ordering of single-fermion orbits to the mixed clusters with a large number of $^{3}\mathrm{He}$ atoms. The resulting ordering looks like the rotational spectrum of a diatomic molecule, being classified only by the angular momentum of the level, although vibrational-like excitations appear at higher energies for sufficiently large $N$.