We reanalyse an experimental work, including some unpublished results, on the adsorption of 4He atoms on a substrate in a 4He-3He mixture. We verify with remarkable accuracy the powerlaw dependence of the 4He adsorption thickness as a function of the distance AT to coexistence : e = C1/ (0394T) 1/3, for thicknesses e ranging from 20 to 80 Å (5 to 20 atomic layers). The analysis is made possible...

We treat in detail positron production from the decay of radioactive nuclei produced in nuclear reactions of accelerated 3He. Because of their large cross sections and low threshold energies, these reactions can significantly contribute to positron production in solar flares with accelerated-particle compositions enriched in 3He. The addition of these 3He reactions extends earlier calculations ...

The ratio 3He/4He (R) plays a central role in models of mantle evolution that propose an undegassed lower mantle, rich in the primordial isotope 3He. A large primordial volatile-rich reservoir, a feature of recent models, is inconsistent with high-temperature accretion and with estimates of crustal and bulk Earth chemistry. High R can alternatively reflect high integrated 3He/(U+Th) ratios or l...

We have used a variational approach to calculate some thermodynamic properties of the quasi-one dimensional liquid 3He such as the energy, entropy, free energy, equation of state and heat capacity at finite temperature. We have employed the Lennard-Jones potential as the inter-atomic interaction. We have seen that the total energy increases by increasing both temperature and density....

We have examined the superfluidity of 3He in 98.2% porous silica aerogel with up to 34% 4He at 21.6 bars. The mixture is phase separated for 4He fractions between ,11% and 34%, and the 4Herich phase preferentially occupies the regions of highest silica density in the aerogel, thus modifying the distribution of the correlated disorder seen by superfluid 3He. The 3He Tc increases slightly with 4H...

2014 Magnetic diffraction in a bcc single crystal of 3He directly proves the occurrence of an antiferromagnetic ordering with a propagation vector ( 1 /2, 0, 0). J. Physique Lett. 46 (1985) L-923 L-927 ler OCTOBRE 1985, Classification Physics Abstracts 67. 80 75 . 25 75. 30E The originality of the magnetic ordering of solid 3 He is that the large zero point motion leads to atom-atom exchange pr...

A Hubbard-like Hamiltonian is used to study exchange-effects in solid 3He when a few 4He atoms are present as impurities. A canonical transformation has been performed to arrive at a Hamiltonian with terms that describe exchange between two 3He atoms, and a 3He atom and a 4He atom. In an attempt to see to what extent the magnetic properties of pure solid 3He remain unaltered, an analog of the L...

We discuss three finite Fermion systems in comparison: nuclei, metal clusters, and droplets of liquid 3He. A principle sorting in “natural units” of energy and length scales is given. We address the theoretical description in terms of self-consistent mean-field theories and their effective energy-density functionals. We look at the interplay of the different time scales from the various constit...

Anodic bonding was used to fabricate a 10 mm diameter × 640 nm tall annular geometry suitable for torsion pendulum studies of confined 3He. For pure 3He at saturated vapor pressure the inertia of the confined fluid was seen to be only partially coupled to the pendulum at 160 mK. Below 100 mK the liquid’s inertial contribution was negligible, indicating a complete decoupling of the 3He from the ...