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Saturation properties of helium drops from a leading-order description

Kievsky, A., Polls, A., Juliá Díaz, B. and Timofeyuk, Natalia (2017) Saturation properties of helium drops from a leading-order description Physical Review A, 96 (4). 040501-1.

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Saturation properties are directly linked to the short-range scale of the two-body interaction of the particles. The case of helium is particular, from one hand the two-body potential has a strong repulsion at short distances. On the other hand, the extremely weak binding of the helium dimer locates this system very close to the unitary limit allowing for a description based on an effective theory. At leading order of this theory a two- and a three-body term appear, each one characterized by a low energy constant. In a potential model this description corresponds to a soft potential model with a two-body term purely attractive plus a three-body term purely repulsive constructed to describe the dimer and trimer binding energies. Here we analyse the capability of this model to describe the saturation properties making a direct link between the low energy scale and the short-range correlations. We will show that the energy per particle, E_N/N, can be obtained with reasonable accuracy at leading order extending the validity of this approximation, characterizing universal behavior in few-boson systems close to the unitary limit, to the many-body system.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Kievsky, A.
Polls, A.
Juliá Díaz, B.
Date : 9 October 2017
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevA.96.040501
Copyright Disclaimer : © 2017 American Physical Society.
Depositing User : Clive Harris
Date Deposited : 03 Oct 2017 08:06
Last Modified : 11 Dec 2018 11:23

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