Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 66: Structure and Dynamics of Nuclei 13
HK 66.5: Vortrag
Donnerstag, 26. März 2015, 18:00–18:15, T/SR19
Femtoscopy measurements in a p(T = 3.5 GeV) + Nb system* — •Oliver Arnold for the HADES collaboration — Physik Department E12 and Excellence Cluster "Universe", Technische Universität München, 85748 Garching, Germany
In the 1950s, Hanburry-Brown and Twiss realized that there is a chance that photons are correlated after their emission from a light emitting astrophysical object like a star. They constructed a formalism, which allowed them to determine the angular size of the object by measuring the correlation signal between the emitted photons. Independently of this discovery, Goldhaber et al. measured later on an angular correlation for like-sign pion pairs in nuclear physics.
We use the technique of two-particle correlations in a femtoscopy measurement of proton and Lambda pairs, which were produced in proton-niobium collisions and detected with HADES, where the proton had a kinetic beam energy of 3.5 GeV. This allows us to extract the region of homogeneity for proton-lambda pairs and additionally study their interaction. For comparisons of the source size we constructed also the correlation functions of proton and pion pairs and measured the kT dependence of the source. Our measurements allow us also to confront the experimental data with predictions of theoretical transport model calculations (UrQMD) to gain information about the emission dynamics of the particles.
*supported by BMBF(05P12WOGHH), Excellence Cluster "Universe" and FIAS/HGS-HIRe