[Triumf-seminars] TRIUMF Special Seminar today at 14:00

[TRIUMF Seminars]

Date/Time: Wed 2012-07-25 at 14:00

Location:  Auditorium          

Speaker:   Iris Dillmann (GSI)

Title:     Nuclear Physics for Heavy Element Nucleosynthesis

Abstract: Neutrons play a crucial role in astrophysics during the heavy element nucleosynthesis. The largest fraction of isotopes heavier than iron is produced by neutron capture processes on short (r process) and long timescales (s process). Up to 35 stable isotopes on the proton-rich side of the chart of nuclides are shielded from the s- and r-process flows and are historically accounted to the "p process" which is in nowadays understanding a superposition of several independently operating scenarios.

I will give an overview about my past and present research topics, starting with neutron-, proton-, and alpha-induced cross sections for the s- and the gamma-process. Connected to these measurements is the "Karlsruhe Astrophysical Database of Nucleosynthesis in Stars" project (www.kadonis.org) which was launched in 2005.

Presently my research group LISA at the GSI Helmholtz Center for Heavy Ion Research is focussed on the identification and measurement of very neutron-rich r-process isotopes via beta-delayed neutrons using a neutron detector setup for the future FAIR/DESPEC collaboration. First measurements were carried out last year at the fragment separator FRS at GSI, and will be continued in the upcoming years at the IGISOL facility in Jyvaskyla/ Finland and other labs.
The vast number of new bn-emitters expected in the next decade at the new generation of RIB facilities all over the world calls for a reliable database. Therefor a proposal for a "Coordinated Research Project" was submitted to the Int. Atomic Energy Agency (IAEA) on the evaluation of the existing beta-delayed neutron emitters.

The second pillar of my group are the measurement of decay properties in storage rings like the present ESR at GSI and the future CR at FAIR in the ILIMA collaboration. This comprises "stellar" half-lives of highly ionized nuclei as well as e.g. an independent approach to measure the neutron-emission probability without detection of the neutron.

Last, but not least I will present some ideas for experiments which I can bring to the existing and future experimental program at ISAC and ARIEL.

Stimulants available 15 minutes before the talk.

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