0000000000826033

AUTHOR

Stefano Fantoni

showing 2 related works from this author

STABILITY AND SPECTRA OF SMALL 3He-4He CLUSTERS

2005

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.

Physics[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]Excitation spectraMagnetic monopolechemistry.chemical_elementStatistical and Nonlinear PhysicsCondensed Matter Physics01 natural sciencesSpectral line010305 fluids & plasmassymbols.namesakechemistry0103 physical sciencessymbolsDiffusion Monte CarloAtomic physics010306 general physicsHamiltonian (quantum mechanics)Mixed Helium clustersExcitationHeliumRecent Progress in Many-Body Theories
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Excitation spectra of aHe3impurity onHe4clusters

2004

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 $N$.

PhysicsAngular momentumHelium-4AtomPhysics::Atomic and Molecular ClustersCluster (physics)Diffusion Monte CarloFermionAtomic physicsDiatomic moleculeAtomic and Molecular Physics and OpticsExcitationPhysical Review A
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