Nuclear Chemistry, Nuclear Structure, Radioactive Decay (including proton decay), Explosive Nucleosynthesis (r-process and rp-process), Nuclear Moments, Exotic Nuclei
Major Recognitions and Honors
My research over the next several years will be focused on the structure and decay of “drip-line” nuclides, that is, nuclides for which the least bound nucleon is about to “drip” off. The overall aim of this research is to uncover and examine the differences in nuclear structure and decay for nuclides in which the last nucleons are not tightly bound. Some of the work will have major implication for nuclear astrophysics as noted below.
Work at Argonne National Laboratory
The recent work in proton decay has proved a rich source of new insight into the location of the proton drip line and the kinds of decay observed for those nuclides. GAMMASPHERE has been used to determine the structure of a number of nuclides near and beyond the proton and neutron drip lines.
Work at the National Superconducting Cyclotron Laboratory at MSU.
The development of the Beta Counting System at the NSCL by Paul Mantica (see below) has moved that lab to the forefront of the study of exotic nuclei. We hope to work on several nuclei of interest to nuclear astrophysics during the next several years, including Zr-110 and In-99.
Work at the ISOLDE on-line mass separator at CERN
Along the neutron drip line, there is much astrophysical interest in establishing the features of nuclear structure that are believed responsible for the abundances of various nuclides created in supernova explosions. One process, the “r-process, is thought to be responsible for enhanced abundances for isotopes with 125 < A > 135. What is remarkable is the boundary of that peak near A = 125 can be interpreted as indicating a dramatic change in nuclear structure near A = 110. Now it is important to push experimental measurements into those nuclides to determine if current ideas hold water or are just unchallenged speculation.
Other research interests.
Other interests include study of neutron capture gamma rays for measuring trace element concentrations at NIST, detection of neutrinos for geology and new detection methods for nuclear forensics and radioactivity for national security purposes.
Recent graduate students and their current positions:
Scott H. Faller, Ph. D. 1986 Staff Scientist, Environmental Protection Agency, Las Vegas
John. D. Robertson, Ph. D. 1986 Professor of Chemistry, University of Missouri
Craig A. Stone, Ph. D. 1987 Associate Professor of Chemistry, San Jose State University
Paul F. Mantica, Ph. D. 1990 Professor of Chemistry, Michigan State University
Brian E. Zimmerman, Ph. D. 1992 Staff Scientist, Nat. Inst. of Standards and Technology
Diana M. Ciurczak, Ph. D. May 1997. Staff Scientist, FBI, Washington, DC.
Joseph Swider Ph. D. May 1998 Analytical Chemist McCrone Associates
Jennifer Jo Ressler, Ph. D. September 2001 Scientist Pacific Northwest Lab
Jason Shergur, Ph. D. May 2005 Nuclear non-proliferation, Los Alamos
Nate Hoteling, Ph. D. September 2008, Los Alamos