BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Kathrin Göbel (Goethe University Frankfurt) DTSTART:20200605T180000Z DTEND:20200605T190000Z DTSTAMP:20260423T005728Z UID:IReNA/6 DESCRIPTION:Title: Co ulomb dissociation of 16O into 4He and 12C\nby Kathrin Göbel (Goethe University Frankfurt) as part of IReNA online seminar\n\n\nAbstract\nThe f usion reaction of carbon and helium to oxygen is the key to understanding the evolution of stars and the relative abundances of both elements. The r eaction rate of 12C(a\,g)16O has to be known with an uncertainty of lower than 10% at a center-of-mass energy of 300 keV during Helium burning condi tions. So far\, experiments have studied the reaction down to about 1 MeV. \n\nWe measured the Coulomb dissociation of 16O into 4He and 12C at the R3 B setup in a first campaign within FAIR Phase-0 at GSI Helmholtzzentrum f ur Schwerionenforschung\, Darmstadt. The goal was to improve the accuracy of the experimental data and to reach lower center-of-mass energies.\n\nTh e experiment required beam intensities of one billion 16O ions per second at an energy of 500 MeV/nucleon. The rare case of Coulomb breakup into 12C and 4He posed another challenge: we had to detect particles with the same magnetic rigidity as the primary beam\, which are not separated by the su per-conducting magnet GLAD. Radical changes of the R3B setup were necessar y: All detectors had slits to allow the passage of the unreacted 16O ions\ , while 4He and 12C would hit the detectors' active areas. We developed an d built detectors based on organic scintillators to track and identify the reaction products with sufficient precision.\n\nThe talk reviews the setu p and the beamtime\, and gives the current status of analysis.\n LOCATION:https://researchseminars.org/talk/IReNA/6/ END:VEVENT END:VCALENDAR