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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster - Hadronenstruktur und -spektroskopie

HK 54.11: Poster

Mittwoch, 6. März 2013, 16:45–19:00, HSZ 3.OG

Study of the Λ(1116) interaction with the cold nuclear environment — •Oliver Arnold — Excellence Cluster “Universe”, Boltzmannstr. 2, 85748, Garching, Germany

The question of the existence of Λ(1116)-hyperons in the interior of a neutron star is not clarified at the moment. The attractive potential of Λ-hyperons eventually leads to the appearance of this particle in the neutron star core and this might substantially soften the nuclear equation of state. This hypothesis should be critically examined in the view of a recent precise measurement of a two-solar-mass neutron star, which disfavours a soft equation of state. Therefore, the strength of the potential is an important parameter in theoretical models of nuclear equations of state.

In order to get information about the Λ interaction strength with nuclear matter at ground state density, we confront the HADES results on Λ production in proton-niobium collisions at a beam kinetic energy of 3.5 GeV with the predictions of different transport models. In particular, we discuss the influence of different parameters of the model (such as production and scattering cross-sections) with help of the GIBUU code.