Effects of shallow-level contamination on the helium isotope systematics of ocean-island lavas

Article Abstract:

The observation of 'high-3He' and 'low-3He' features in lavas from the Heard Island, Indian Ocean, reveal that the helium isotope ratios are not accurate parameters for determining the evolution and composition of the mantle of the Earth. The helium isotope ratios are used conventionally to model the development and composition of the mantle. The observations indicate that the 'high-He3' lavas provide information the origin and composition of the mantle while 'low-He3' measurements reveal no relationship to the Earth's mantle.

Lava, Magma, Helium isotopes

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Josephson effect and a pi-state in superfluid (super3)He

Article Abstract:

There is evidence for Josephson-type behaviour in superfluid helium-3 ((super3)He) flow via an array of 4,225 apertures and for metastable pi-state at low temperatures. It is shown that an array of holes may not be the single weak link in such a system. Direct measurement of current-phase links in an array of holes should be interpreted carefully. Data can be simply reproduced and do not reveal the existence of an exotic pi-junction.

Observations, Superfluidity, Josephson effect

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Getting excited about helium

Article Abstract:

The transformation of cooled liquid helium to a liquid that flows without friction, is known as Bose-Einstein condensation. Researchers in France have found that it is possible to create a similar quantum fluid from a gas of excited atoms.

Bose-Einstein condensation, Quantum liquids

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