RIBF Nuclear Physics Seminar:Fission of proton-rich nuclei in the lead region
by
Prof.Andrei Andreyev(University of the West of Scotland, Paisley, UK)
→
Asia/Tokyo
RIBF Coference Hall, RIKEN
RIBF Coference Hall, RIKEN
Description
The talk reviews recent low-energy fission experiments in very proton-rich nuclei in the lead region.
Results of experiments at SHIP (GSI) and ISOLDE (CERN) on the very exotic process of low-energy beta-delayed fission of neutron-deficient Tl, At and Fr nuclei will be presented. Beta-delayed fission is a rare nuclear decay process in which beta-decay of a parent nuclide populates excited states of the daughter, which may then fission. Recent identification of beta-delayed fission of 202Fr, 194,196At and 178,180Tl at ISOLDE will also be presented. The studies of At and Tl isotopes were facilitated by the use of the highly-selective Resonance Ionization Laser Ion Source of ISOLDE.
As a result of these experiments, a new region of asymmetric fission was established, which includes isotopes 178,180Hg (N/Z=1.22-1.25), in addition to the previously known broad area of asymmetric fission in the heavy actinides with N/Z~1.55-1.6.
1. A. Andreyev et al., “New type of asymmetric fission in proton-rich nuclei”, Phys. Rev. Lett. 105, 252502 (2010)
