Publications (12)
Translationally invariant treatment of pair correlations in nuclei: I. Spin and isospin dependent correlations
R. Guardiola, P. I. Moliner, J. Navarro +3
We study the extension of our translationally invariant treatment of few-body nuclear systems to heavier nuclei. At the same time we also introduce state-dependent correlation oper…
Excitation levels and magic numbers of small para-Hydrogen clusters (N)
R. Guardiola, J. Navarro
The excitation energies of parahydrogen clusters have been systematically calculated by the diffusion Monte Carlo technique in steps of one molecule from 3 to 40 molecules. These c…
A diffusion Monte Carlo study of small para-Hydrogen clusters
R. Guardiola, J. Navarro
Ground state energies and chemical potentials of parahydrogen clusters are calculated from 3 to 40 molecules using the diffusion Monte Carlo technique with two different pH2-pH2 in…
Minimal mass-size of a stable 3He cluster
R. Guardiola, J. Navarro
The minimal number of 3He atoms required to form a bound cluster has been estimated by means of a Diffusion Monte Carlo procedure within the fixed-node approximation. Several impor…
High-quality variational wave functions for small 4He clusters
R. Guardiola, M. Portesi, J. Navarro
We report a variational calculation of ground state energies and radii for 4He_N droplets (3 \leq N \leq 40), using the atom-atom interaction HFD-B(HE). The trial wave function has…
Ca impurity in small mixed He-He clusters
R. Guardiola, J. Navarro, D. Mateo +1
The structure of small mixed helium clusters doped with one calcium atom has been determined within the diffusion Monte Carlo framework. The results show that the calcium atom sits…
Translationally-invariant coupled-cluster method for finite systems
R. Guardiola, I. Moliner, J. Navarro +1
The translational invariant formulation of the coupled-cluster method is presented here at the complete SUB(2) level for a system of nucleons treated as bosons. The correlation amp…
Translationally invariant treatment of pair correlations in nuclei: II. Tensor correlations
R. F. Bishop, R. Guardiola, I. Moliner +4
We study the extension of our translationally invariant treatment of few-body nuclear systems to include tensor forces and correlations. It is shown that a direct application of ou…
Excitation spectra of a 3He impurity on 4He clusters
S. Fantoni, R. Guardiola, J. Navarro
The diffusion Monte Carlo technique is used to calculate and analyze the excitation spectrum of a single 3He atom bound to a cluster with N 4He atoms, with the aim of establishing…
A family of complex potentials with real spectrum
F. M. Fernandez, R. Guardiola, J. Ros +1
We consider a two-parameter non hermitean quantum-mechanical hamiltonian that is invariant under the combined effects of parity and time reversal transformation. Numerical investig…
State-dependent Jastrow correlation functions for 4He nuclei
R. Guardiola, M. Portesi
We calculate the ground-state energy for the nucleus 4He with V4 nucleon interactions, making use of a Jastrow description of the corresponding wavefunction with state-dependent co…
The spectra of mixed He-He droplets
S. Fantoni, R. Guardiola, J. Navarro +1
The diffusion Monte Carlo technique is used to calculate and analyze the excitation spectrum of He atoms bound to a cluster of He atoms, by using a previously determined op…