Speaker
Stefan Lalkovski
(University of Sofia)
Description
The r-process overabundance in the mass region A~120
has been a subject of considerable scientific interest in the
last decade. Different nuclear physics phenomena such as
shell-quenching and "unreasonably" long beta-decay
half-lives were discussed as possible reasons for the
observed discrepancy.
Long-lived activities are known to exist throughout a number of
odd-Z, even-N and even-Z, odd-N nuclei in the A<132 region. In the regions
around the doubly magic nuclei these single-particle isomers are
expected to persist up to the respective shell gap, which in the
neutron-rich region may lead to situations, where the excited isomeric
state has a half-life longer than the ground state half-life.
Therefore, the present proposal focuses on the search for long-lived
millisecond beta-decaying isomeric states, placed in vicinity to the
132Sn nucleus.
Primary author
Stefan Lalkovski
(University of Sofia)
Co-authors
Filip Kondev
(Argonne National Laboratory, USA)
Phil Walker
(University of Surrey, UK)
Zsolt Podolyak
(University of Surrey, UK)
