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arXiv · 2602.12225

Second excited state of ${}^4\mathrm{He}$ tetramer

A. Deltuva
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Abstract

The four-boson universality suggests the existence of the second excited tetramer state in a system of cold ${}^4\mathrm{He}$ atoms. It is not bound but could be seen as a resonance in the atom-trimer scattering. This process is rigorously calculated using the momentum-space transition operator framework with two realistic interatomic potentials. The $S$-wave phase shift and cross section show a resonant behavior below the excited trimer threshold, but there are sizable nonresonant contributions from $P$ and $D$ waves as well. The position and width of the resonant state is determined, and for the latter significant finite-range effects are found.

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A. Deltuva. 2026-02-12. Second excited state of ${}^4\mathrm{He}$ tetramer. https://doi.org/10.1103/fmpz-xsqq

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