Hypernuclei production with a modified coalescence model in BUU transport calculations

TL;DR

This paper introduces a covariant, dynamical coalescence model within BUU transport calculations to improve hypernuclei production predictions, fitting cluster formation parameters to experimental data and estimating yields of various hypernuclei.

Contribution

It develops a modified coalescence model with a dynamical, covariant approach for hypernuclei production in transport simulations, calibrated with experimental data.

Findings

Fitted cluster formation time to FOPI data.

Estimated hypernuclei yields consistent with other methods.

Provided predictions for hypernuclei in high-energy collisions.

Abstract

In this paper, the usual momentum- and coordinate-space distance criteria for creating nuclear clusters in transport simulations are addressed by using a dynamical, covariant description in an off-shell Boltzmann-Uehling-Uhlenbeck transport approach. The free parameter of this clustering scheme is the cluster formation time, which is fitted through the FOPI data of low energy charged cluster multiplicities in Au+Au collisions at 150 A MeV and 400 A MeV incident energies. The coalescence model is used to estimate the yields of the 3H(Lambda), 5H(2Lambda), 6He(2Lambda) single and double strange hypernuclei in central Au+Au collisions between 2, and 20 A GeV incident energies, giving comparable results to estimations from other methods.