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Accueil du site > Actualités et Faits Marquants > GROUND-STATE PROPERTIES OF UNITARY BOSONS : FROM CLUSTERS TO MATTER [1]


PHYS. REV. LETT. 119, 223002 (2017)

"One of the most important properties of nuclei is saturation : although nuclear interactions are attractive overall, the growth in binding energy tapers off as the number of nucleons in the nucleus increases. As a consequence, heavy nuclei have some properties of a liquid drop. The simplest nucleus --- the deuteron --- has a small binding energy, which has led to a recent suggestion by Bira van Kolck and collaborators that nuclei can be described in a systematic expansion around the unitarity limit where the two-body system just becomes unbound. In this theory, there is only one essential scale, the three-body binding energy. Nuclei are then expected to share some similarities with bosons at unitarity. In the recently published paper, clusters of unitary bosons, which are the focus of many experiments with cold atoms, are shown to be universal : their binding energies are determined by the three-body binding energy. They saturate and form a fluid with a density almost 300 times larger than that of the three-body system. Despite strong correlations, the condensate fraction is close to 1, the value for a weakly interacting boson gas. The relatively large overlap of the two states could lead to an experimental verification of the universal properties of the unitary Bose fluid in thermal equilibrium."

Link[1] : https://journals-aps-org.proxy.scd....

Voir en ligne : PHYS. REV. LETT. 119, 223002 (2017)



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