Deformation and weak decay of Lambda hypernuclei

Details Deformation and weak decay of Lambda hypernuclei Deformation and weak decay of Lambda hypernuclei

2009-03-18

arxiv.org/abs/0903.3093v1

Physics

Nuclear Physics

Nuclear Theory

A talk given at Sendai International Symposium on Strangeness Nuclear and Hadronic Systems (SENDAI08), Dec. 15-18, 2008, Senda

Scientific paper

We use the self-consistent mean-field theory to discuss the ground state and decay properties of $\Lambda$ hypernuclei. We first discuss the deformation of $\Lambda$ hypernuclei using the relativistic mean-field (RMF) approach. We show that, although most of hypernuclei have a similar deformation parameter to the core nucleus, the shape of $^{28}$Si is drastically altered, from oblately deformed to spherical, if a $\Lambda$ particle is added to this nucleus. We then discuss the pionic weak decay of neutron-rich $\Lambda$ hypernuclei using the Skyrme Hartree-Fock + BCS method. We show that, for a given isotope chain, the decay rate increases as a function of mass number, due to the strong neutron-proton interaction.

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