Deformation of Lambda hypernuclei

Abstract

We study the deformation property of $\Lambda$ hypernuclei using the relativistic mean field (RMF) method. We find that ${}_{\Lambda }^{29}$Si and ${}_{\Lambda }^{13}$C hypernuclei have spherical shape as a consequence of the additional $\Lambda$ particle, whereas the corresponding core nuclei, ${}^{28}$Si and ${}^{12}$C, are oblately deformed. Most of other hypernuclei have a similar deformation parameter to the core nucleus, in accordance with the previous study with the non-relativistic Skyrme-Hartree-Fock method. We discuss the sensitivity of our results to the choice of pairing interaction and to the parameter set of the RMF Lagrangian.

Comments: 5 pages, 6 eps figures