J. Navarro

Monte Carlo calculations for liquid 4He at negative pressure.

A quadratic diffusion Monte Carlo method has been used to obtain the equation of state of liquid

Nucleation in dilute 3He-4He liquid mixtures at low temperatures

^{4}mathrm{He}

Las independencias iberoamericanas en su laberinto. Controversias, cuestiones, interpretaciones.

including the negative pressure region down to the spinodal point. The atomic interaction used is a revised version of the Aziz potential, which reproduces quite accurately the features of the experimental equation of state. The spinodal pressure has been calculated and the behavior of the sound velocity around the spinodal density has been analyzed.

Spectrum of a 3He atom in a Ca@4He50 droplet

We present a study of phase separation from supersaturated3He-4He liquid mixtures at low temperatures addressing both the degree of critical supersaturation Δxcrand the thermal-to-quantum crossover temperature T* for the nucleation process. Two different nucleation seeds are investigated, namely3He droplets and4He vortex lines with cores filled with3He. We have found that the experimental T* is reproduced when we consider that nucleation proceeds from3He droplets, whereas Δxcris reproduced when we consider4He vortex lines filled with3He. However, neither nucleation configuration is able to simultaneously reproduce the current experimental information on Δxcrand T*.

A Density Functional for Liquid 3He Based on the Aziz Potential

Esta obra debemos enmarcarla en la ya dilatada trayectoria del Dr. Manuel Chust, profesor de la Universitat Jaume I, que ha venido alentando los estudios comparativos entre la realidad peninsular e iberoamericana en el periodo de las independencias de las republicas americanas. Un proceso que venia requiriendo desde hace tiempoxa0de los encuentros que ha potenciado junto a otros colegas como Ivana Frasquet y Victor Minguez desde la pequena pero dinamica universidad ubicada en Castellon, ya fuera desde la vertiente historica o desde la iconografica, las que confluyen en no pocas ocasiones en torno al proceso que aborda este libro colectivo.

Structure of small clusters of parahydrogen molecules

Within density functional theory, we have studied the solvation onset of Ca in a 4He droplet to which a small number of 3He atoms is being added. In a first step, we have considered the case study of Ca@4He50 to which we have added one single 3He atom. We have obtained the 3He spectrum and probability density distributions. These results are used to infer how many 3He atoms are needed to start coating the Ca impurity in that drop.

Thermal nucleation and cavitation in 3He and 4He.

We propose a new class of density functionals for liquid 3He based on the Aziz helium‐helium interaction screened at short distances by the microscopically calculated two‐body distribution function g(r). Our aim is to reduce to a minumum the unavoidable phenomenological ingredients inherent to any density functional approach. Results for the homogeneous liquid and droplets are presented and discussed.