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SUMMARY:Rana Ezzeddine (University of Florida)
DTSTART:20200508T180000Z
DTEND:20200508T190000Z
DTSTAMP:20260404T100117Z
UID:IReNA/1
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/IReNA
 /1/">Insights into the lives (and deaths) of the first stars from observat
 ions of metal-poor stars</a>\nby Rana Ezzeddine (University of Florida) as
  part of IReNA online seminar\n\n\nAbstract\nThe oldest\, most metal-poor 
 stars found in the Galactic halo and satellite dwarf galaxies retain in th
 eir atmospheres the chemical footprints of the high redshift Universe. Emp
 loying “stellar archaeology” – the diverse use of the chemical and d
 ynamical properties of metal-poor stars – outstanding questions about th
 e early Universe can be answered. Using high resolution optical and UV spe
 ctroscopic observations of the dataset of the most chemically interesting 
 metal-poor stars\, I aim to probe the nature of the first stars and supern
 ovae explosions (SNe)\, the relevant nucleosynthesis processes responsible
  for the formation and evolution of the elements as well as early star and
  galaxy formation processes. I will discuss how we I’ve used the most me
 tal-poor Galactic stars to help elucidate the nature of their first star p
 rogenitors and mechanisms of the SNe responsible for their chemical signat
 ures. I will highlight how these metal-deficient stars could be used to pl
 ace constraints on modelling of non-equilibrium steady-state systems\, as 
 applied to studies of stellar and planetary atmospheres. Additionally\, I 
 will touch on recent advancements in our understanding of the heaviest ele
 ments formation in metal-poor stars via the r(apid) neutron capture r-proc
 ess\, especially in light of the ground-breaking gravitational wave discov
 ery of the binary neutron star mergers event GW170817.\n
LOCATION:https://stable.researchseminars.org/talk/IReNA/1/
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BEGIN:VEVENT
SUMMARY:Donna Dean (American Chemical Society)
DTSTART:20200522T180000Z
DTEND:20200522T190000Z
DTSTAMP:20260404T100117Z
UID:IReNA/2
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/IReNA
 /2/">Developing strong mentoring relationships (part 1 of series)</a>\nby 
 Donna Dean (American Chemical Society) as part of IReNA online seminar\n\n
 Abstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/IReNA/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sabrina Schäfer (Darmstadt)
DTSTART:20200710T180000Z
DTEND:20200710T190000Z
DTSTAMP:20260404T100117Z
UID:IReNA/4
DESCRIPTION:by Sabrina Schäfer (Darmstadt) as part of IReNA online semina
 r\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/IReNA/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Donna Dean (American Chemical Society)
DTSTART:20200529T180000Z
DTEND:20200529T190000Z
DTSTAMP:20260404T100117Z
UID:IReNA/5
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/IReNA
 /5/">Developing strong mentoring relationships (part 2 of series)</a>\nby 
 Donna Dean (American Chemical Society) as part of IReNA online seminar\n\n
 Abstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/IReNA/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kathrin Göbel (Goethe University Frankfurt)
DTSTART:20200605T180000Z
DTEND:20200605T190000Z
DTSTAMP:20260404T100117Z
UID:IReNA/6
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/IReNA
 /6/">Coulomb dissociation of 16O into 4He and 12C</a>\nby Kathrin Göbel (
 Goethe University Frankfurt) as part of IReNA online seminar\n\n\nAbstract
 \nThe fusion reaction of carbon and helium to oxygen is the key to underst
 anding the evolution of stars and the relative abundances of both elements
 . The reaction 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 burnin
 g conditions. 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 R3B setup in a first campaign within FAIR Phase-0 at GSI Helmholtzzen
 trum fur Schwerionenforschung\, Darmstadt. The goal was to improve the ac
 curacy of the experimental data and to reach lower center-of-mass energies
 .\n\nThe experiment required beam intensities of one billion 16O ions per 
 second at an energy of 500 MeV/nucleon. The rare case of Coulomb breakup i
 nto 12C and 4He posed another challenge: we had to detect particles with t
 he same magnetic rigidity as the primary beam\, which are not separated by
  the super-conducting magnet GLAD. Radical changes of the R3B setup were n
 ecessary: All detectors had slits to allow the passage of the unreacted 16
 O ions\, while 4He and 12C would hit the detectors' active areas. We devel
 oped and built detectors based on organic scintillators to track and ident
 ify the reaction products with sufficient precision.\n\nThe talk reviews t
 he setup and the beamtime\, and gives the current status of analysis.\n
LOCATION:https://stable.researchseminars.org/talk/IReNA/6/
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