Non-Symmetrized Hyperspherical Harmonics Method for Non-Equal Mass Three-Body Systems

TL;DR

This paper reviews and applies a non-symmetrized hyperspherical harmonics method to three-body nuclear systems with two equal masses and one different, analyzing binding energies of $^3$H, $^3$He, and $^3_{\Lambda}$H hypernucleus.

Contribution

It introduces and tests a non-symmetrized hyperspherical harmonics approach for non-equal mass three-body systems, providing accurate binding energy calculations for various nuclei.

Findings

Method shows good convergence and accuracy.

Difference in binding energy between $^3$H and $^3$He is quantified.

Binding energies of $^3_{\Lambda}$H are computed with different potentials.

Abstract

The non-symmetrized hyperspherical harmonics method for a three-body system, composed by two particles having equal masses, but different from the mass of the third particle, is reviewed and applied to the $^3$H, $^3$He nuclei and $^3_{\Lambda}$H hyper-nucleus, seen respectively as $nnp$, $ppn$ and $NN\Lambda$ three-body systems. The convergence of the method is first tested in order to estimate its accuracy. Then, the difference of binding energy between $^3$H and $^3$He due to the difference of the proton and the neutron masses is studied using several central spin-independent and spin-dependent potentials. Finally, the $^3_{\Lambda}$H hypernucleus binding energy is calculated using different $NN$ and $\Lambda N$ potential models. The results have been compared with those present in the literature, finding a very nice agreement.