High-pressure measurements of the isotopic shift in the melting curve of He
- 24 August 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 69 (8) , 1216-1219
- https://doi.org/10.1103/physrevlett.69.1216
Abstract
The isotopic shift in the melting curve of He has been measured between 70 and 260 K. An exponential divergence from accurate path-integral Monte Carlo calculations is observed which leads to an opposite isotopic shift above 200 K. The same measurements have also been performed in isotopic at 296 K where a reasonable agreement with theory is obtained. Tentative explanations of this puzzling discrepancy in He are discussed: importance of many-body forces, breakdown of the Born-Oppenheimer approximation, and importance of statistics.
Keywords
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