"Gamma and electron spectroscopy of the heaviest elements"
Paul Greenlees, University of Jyväskylä
(id #210)
Seminar: NoPoster: No
Invited talk: Yes
Gamma and electron spectroscopy of the heaviest elements
P.T. Greenlees
Department of Physics, University of Jyväskylä, Finland
The production and spectroscopic study of the heaviest elements has always been a central theme of nuclear physics. In recent years, a wealth of new data has been produced, both in terms of new elements (up to Z=118 [1]) and in detailed spectroscopic studies of nuclei with masses above 240 [2]. Such studies provide data concerning nuclear parameters such as masses, decay modes, half-lives, moments of inertia, single-particle properties, etc., in systems with the highest possible number of protons. The main focus of current experiments is the search for the next closed proton- and neutron- shells beyond the doubly magic 208Pb.
This search can be made directly, by producing nuclei in the region of interest (Z>112 and N>176), or indirectly through the study of lighter deformed nuclei where the orbitals of interest at sphericity are active at the Fermi surface.
In the latter case, the production cross section is large enough to permit detailed in-beam spectroscopic studies. These studies employ state-of-the art spectrometers such as the JUROGAM array of germanium detectors or the newly-commissioned SAGE combined conversion electron and gamma-ray spectrometer.
Examples of recent highlights in heavy element studies with stable beams, along with the opportunities provided by current and future facilities to extend these studies will be presented.
[1] Yu.Ts. Oganessian et al., Phys. Rev. C 74, 044602 (2006).
[2] R.-D. Herzberg and P.T. Greenlees, Prog. Part. Nucl. Phys. 61, 674 (2008).
P.T. Greenlees
Department of Physics, University of Jyväskylä, Finland
The production and spectroscopic study of the heaviest elements has always been a central theme of nuclear physics. In recent years, a wealth of new data has been produced, both in terms of new elements (up to Z=118 [1]) and in detailed spectroscopic studies of nuclei with masses above 240 [2]. Such studies provide data concerning nuclear parameters such as masses, decay modes, half-lives, moments of inertia, single-particle properties, etc., in systems with the highest possible number of protons. The main focus of current experiments is the search for the next closed proton- and neutron- shells beyond the doubly magic 208Pb.
This search can be made directly, by producing nuclei in the region of interest (Z>112 and N>176), or indirectly through the study of lighter deformed nuclei where the orbitals of interest at sphericity are active at the Fermi surface.
In the latter case, the production cross section is large enough to permit detailed in-beam spectroscopic studies. These studies employ state-of-the art spectrometers such as the JUROGAM array of germanium detectors or the newly-commissioned SAGE combined conversion electron and gamma-ray spectrometer.
Examples of recent highlights in heavy element studies with stable beams, along with the opportunities provided by current and future facilities to extend these studies will be presented.
[1] Yu.Ts. Oganessian et al., Phys. Rev. C 74, 044602 (2006).
[2] R.-D. Herzberg and P.T. Greenlees, Prog. Part. Nucl. Phys. 61, 674 (2008).
