Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Poster

T 22.6: Poster

Monday, March 25, 2019, 16:00–18:30, C.A.R.L. Foyer 1. OG

Measurement of Nuclear Fragmentation Cross Sections of Carbon on Proton to Boron with NA61/SHINE at the CERN SPS — •Franziska Sutter for the NA61/SHINE collaboration — Karlsruher Institut of Technology

A precise knowledge of fragmentation cross sections of intermediate mass nuclei is very important for the understanding of the propagation of cosmic rays in our Galaxy. The main observable to constrain the average integrated mass density traversed by the cosmic rays is the ratio of secondary-to-primary cosmic rays, especially the boron to carbon ratio, B/C, which has been recently measured by AMS with a precision of several percent. On the other hand, the cross section for the most crucial production channel for boron, C+p → B+X, has a cross section uncertainty of about 15−20 %.

In this poster we will present new measurements of carbon fragmentation with the NA61/SHINE facility at the SPS at CERN. One week of data with a fragmented Pb-ion beam at 13−13.5 AGeV/c was taken in December 2018. By using a carbon trigger as well as two different targets made of polyethylene and carbon the cross section measurement at isotope level was performed.