Doc. dr. sc. Nikola Poljak
Fizički odsjek Prirodoslovno matematičkog fakulteta Sveučilišta u Zagrebu
Experimental study of the nuclear force between antiprotons
Utorak/Tuesday 19.01.2016. u 14:15 h. room F08, I. floor
One of the primary goals of nuclear physics is to understand the force
between nucleons, which is a necessary step for understanding the
structure of nuclei and their interaction. The large body of knowledge
of the nuclear force that has been acquired was derived from studies
made on either nucleons or nuclei. Although antinuclei up to
antihelium-4 have been discovered and their masses measured, little is
known directly about the nuclear force between antinucleons. We study
antiproton pair correlations in data collected by the STAR experiment at
the Relativistic Heavy Ion Collider (RHIC), where gold ions collide with
a centre-of-mass energy of 200 GeV per nucleon pair. Antiprotons are
abundantly produced in such collisions, making it feasible to study
details of the antiproton–antiproton interaction. By applying a
technique similar to Hanbury Brown and Twiss interferometry, we show
that the nuclear force between two antiprotons is attractive. In
addition, we report two key parameters that characterize the
corresponding strong interaction: the scattering length and the
effective interaction range. The measured parameters are consistent with
the corresponding values for proton–proton interactions.
Voditelji seminara FO
Damir Paji´c i Ivica Smoli´