D ec 1 99 5 A microscopic approach to the response of 3 He - 4 He mixtures
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ar X iv : n uc l - th / 9 81 10 45 v 3 1 D ec 1 99 9 Alternative evaluations of halos in nuclei
Data for the scattering of 6 He, 8 He, 9 Li, and 11 Li from hydrogen are analyzed within a fully microscopic folding model of proton-nucleus scattering. Current data suggest that of these only 11 Li has a noticeable halo. For 6 He, we have also analyzed the complementary reaction 6 Li(γ, π +) 6 He gs. The available data for that reaction support the hypothesis that 6 He may not be a halo nucleu...
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We present a study of phase separation from supersaturated 3 He-4 He liquid mixtures at low temperatures addressing both the degree of critical super-saturation ∆x cr and the thermal-to-quantum crossover temperature T * for the nucleation process. Two different nucleation seeds are investigated, namely 3 He droplets and 4 He vortex lines with cores filled with 3 He. We have found that the exper...
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I present here a microscopic theory for the superfluidity of 4 He (He II) derived from experiments, and answer its essential questions. With a " momenton " model, the superfluid is shown to feature as a " harmonic superfluid ". In which a new bonding type, the " superfluid bond " , is formed. Its activation causes the anomalous thermal excitation, the large excess of specific heat, etc. The sup...
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We have investigated the quantum-to-thermal crossover temperature T for cavitation in liquid helium mixtures up to 5% He concentrations. With respect to the pure He case, T is sizeably reduced, to a value below 50 mK for He concentrations above 2%. As in pure He, the homogeneous cavitation pressure is systematically found close to the spinodal pressure. 64.60.Qb, 64.60.My, 67.60.-g, 67.80.Gb Ty...
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