Recent Activities for Beta-Decay Half-Lives and Beta-Delayed Neutron Emission of Very Neutron-Rich Isotopes
- Iris Dillmann, TRIUMF
Wednesday, December 4, 4:10 PM - Nuclear Science Seminar
NSCL Lecture Hall
Beta-delayed neutron (bn) emitters play an important, two-fold role in the stellar nucleosynthesis of heavy elements in the "rapid neutron-capture process" (r process). On one hand they lead to a detour of the material beta-decaying back to stability. On the other hand, the released neutrons increase the neutron-to-seed ratio and are re-captured during the freeze-out phase and thus influence the final solar r-abundance curve.
A large fraction of the isotopes for r-process nucleosynthesis are not yet experimentally accessible and are located in the "terra incognita". With the next generation of fragmentation and ISOL facilities presently being built the main motivation of all projects is the investigation of very neutron-rich isotopes. However, reaching more neutron-rich isotopes means also that multiple neutron-emission becomes the dominant decay mechanism.
Presently, various experimental campaigns are in progress (e.g. TRIUMF, Canada) or being planned in the near future (BRIKEN, Japan). In parallel to these activities, the International Atomic Energy Agengy (IAEA) has approved a Coordinated Research Project over four years about "Beta-Delayed Neutron Emission Evaluation" to create a solid basis for the vast amount of new neutron-rich isotopes being discovered with the new generation of RIB-facilities in the next decades.