Hypernuclear physics and neutron stars

Abstract

Hypernuclear physics and neutron stars are 111'0 quite different topics of research in physics. However, both topics are based on one well-known principle in physics, the exclusion principle. Proposed by Wolfgang Pauli more than 80 years ago, the exclusion principle has been proven to have far-reaching consequences, from femtoscopic world to macroscopic, super-dense, and fully relativistic objects. Starting from this principle, we will discuss the production of hypernucleus, a nucleus that contains one or two hyperons inside. To this end we will consider the electromagnetic production of the hypertriton, the lightest hypernucleus. We will also touch on the problem of elementary operator in the hypernucleus photoproduction, namely the electromagnetic production of strangeness on the nucleon. The topic is of interest since it also has many applications in the .field of hadronic physics, e.g., in searching for missing resonances, the nucleon resonances predicted by some constituent quark models but have not been observed in 7rN - 7rN scattering experiments used by the Particle Data Group. After the discussion of the hypernucleus, we move on to the topic of the neutron stars and discuss the neutrino mean free paths in a neutron star. The effect of the neutrino trapping on the properties of neutron star matter will be explored. For this purpose we make use of the some relativistic mean field models, which have been proposed recently.