Thursday, December 12, 2024, 16:00
WBGB/019
Michael Block, University Mainz & GSI Darmstadt
Abstract:
The study of superheavy nuclei is at the forefront of contemporary
nuclear physics. Since the initial prediction of their existence in the
1960s, many isotopes of elements up to Z=118 (Oganesson) have been
synthesized and investigated. One of the most intriguing predictions was
the existence of the so-called island of stability. Recent data
provides strong support for this concept, although it is more accurately
described as a region of increased stability. At the GSI Helmholtz
Centre in Darmstadt, we have been at the cutting edge of superheavy
element research for over 50 years, leading to the discovery of six new
chemical elements and conducting numerous pioneering experiments. In
recent years, our research program has expanded to investigate the
atomic, nuclear, and chemical properties of the heaviest man-made
elements comprehensively. In my group, we have extended the capabilities
of Penning-trap mass spectrometry to access superheavy nuclides up to
Z=105. Additionally, we have launched a laser spectroscopy program aimed
at studying both atomic and nuclear properties, using techniques such as
isotope shift measurements and hyperfine spectroscopy. These
advancements have been made possible by significant methodological and
technical developments, which allow for the efficient manipulation of
rare isotopes and precision measurements at low energies. Our
experiments have produced a wealth of new data that enhances our
understanding of the evolution of nuclear shell structure in heavy
elements, from fermium to dubnium. These insights have been obtained
through complementary methods, providing a comprehensive picture of the
behavior in this region. In my presentation, I will provide an overview
of the status of superheavy element research and highlight key results
from recent measurement campaigns at the GSI in Darmstadt, Germany.