William Cassata is an expert in applications of noble gas mass spectrometry to cosmochemistry and nuclear forensics. He is the lead scientist of the Livermore Noble Gas Lab, a state-of-the-art facility for noble gas isotope ratio and abundance measurements.   

As a noble gas geochemist, William’s research seeks to use isotopic variations created by natural and anthropogenic processes to understand historical events or otherwise unobservable phenomena. He led a Laboratory Directed Research Development project in which his team focused on analyzing trapped atmospheric gases in Martian meteorites to constrain atmospheric evolution on Mars. This research offers insights into atmospheric conditions on Mars in the distant past that are relevant to current Mars rover and orbiter missions. William is a recipient of the Early and Mid-Career Recognition Award, a program recognizing the exceptional scientific achievements of staff who received their most recent degree within the last four to 16 years.  

William obtained a Ph.D. in earth and planetary science from the University of California, Berkeley, and a B.S. in geology and geophysics from the University of Wisconsin, Madison. 

Narek Gharibyan is a deputy group leader for the Laboratory’s Nuclear and Radiochemistry Group. He supports experimental nuclear science at the National Ignition Facility, where he collaborates with colleagues to develop radiochemistry diagnostic techniques for analyzing samples collected from high-yield laser shots. In addition, he leads/co-leads research projects in pre- and post-detonation nuclear forensics, supporting mission-relevant aims across the national security complex. 

Narek also led a project funded by LLNL’s Laboratory Directed Research and Development Program, where the research team developed a prototype chemistry-on-a-chip platform for field-deployable nuclear forensics. The device offers scientists an assessment tool for rapidly identifying actinides, or other radioactive elements of interest, from post-detonation nuclear debris.  

Before joining LLNL, Narek performed undergraduate research at Lawrence Berkeley National Laboratory and interned at Los Alamos National Laboratory’s Seaborg Institute. He now enjoys giving back to the nuclear forensics community and has mentored student interns who are part of the Nuclear Forensics Summer Program, hosted by LLNL’s Seaborg Institute.  

Narek holds a Ph.D. in radiochemistry from the University of Nevada, Las Vegas, and a B.S. in chemistry from the University of California, Berkeley. 

Kay Kolos McCubbin was drawn to science and math from an early age. When she had the opportunity to visit a national laboratory in Germany and was exposed to purely scientific environments, she knew she would pursue a career in scientific research.   

Kay is a research scientist in the Nuclear and Chemical Sciences Division. Her work involves innovative techniques that take advantage of radioactive beams and state-of-the-art radiation detectors to perform detailed measurements of nuclear decays and reactions. For example, she worked on the development of a method to measure very precisely the probability of gamma-radiation emission from beta decays of fission products. Kay says, “I am very proud of my work on this project as it has an impact on basic science and the Laboratory’s mission, but also because it taught me how much work and patience precision measurements require.” Kay also appreciates the dynamic nature of the work at Lawrence Livermore: “Our work is ever-changing,” she says. “We utilize our knowledge to push science further and further, solve problems quicker and everything we learn along the way is very enriching.” She is a member of the Lawrence Livermore Laboratory Women’s Association and enjoys activities such as hiking, biking, running and playing tennis outside of work.   

Kay received her Ph.D. at the University of Paris-Sud Institute of Nuclear Physics in Orsay, an M.S. in physics at the University of Jyvaskyla and an M.S. in physics and B.S. in physics at the University of Technology in Warsaw, Poland. 

Wei Jia Ong joined the Laboratory as a Lawrence Fellow—a highly competitive postdoctoral position offered at Livermore. As a scientist in the Nuclear and Chemical Sciences Division, her research interests lie in nuclear astrophysics, particularly the nucleosynthesis of elements in the cosmos as well as nuclear reactions that take place atop or within accreting neutron star crusts. Wei has led a Laboratory Directed Research Development project, investigating the weak r-process (rapid neutron-capture process) nucleosynthesis through an interdisciplinary approach that combines nuclear reaction rate measurements, computational modelling and presolar grain isotopic measurements to test the viability of neutrino-driven winds in a core-collapse supernova as a source of heavy elements in the cosmos. In addition, Wei is involved in collaborative radioactive beam experiments with scientists from Michigan State University’s new Facility for Rare Isotopes and Argonne National Laboratory’s (ANL) Argonne Tandem Linac Accelerator System. Prior to her work at Livermore, Ong worked in the Physics division at ANL, performing nuclear physics experiments using the Multi-Sampling Ionization Chamber (MUSIC).   

Wei earned a Ph.D. in physics from Michigan State University and a B.A. in physics from Washington University in St. Louis. 

When he was growing up, Nicolas Schunck recalls always wanting to know ‘why’ things are the way they are. He says, “My desire to seek answers and bring a sense of order to the universe has inspired and fueled my scientific career as a theoretical nuclear physicist.”   

Nicolas’s research for the Nuclear and Chemical Sciences Division in the Physical and Life Sciences Directorate focuses on the fundamental mechanisms of nuclear fission and the development of theoretical methods to describe the structure and decay of heavy atomic nuclei. He has more than a decade of experience in high-performance computing applications on leadership-class computers and is active in the development and exploration of machine-learning techniques to improve computational nuclear theory. For the last several years, Nicolas has served as principal investigator for the Fission in R-process Elements topical collaboration in nuclear theory, joining with five different institutions to better understand where and how heavy elements are formed in the universe. He has developed both a national and an international network of collaborations. Before joining Livermore as a staff scientist, he was a postdoctoral researcher at the University of Surrey (UK), Universidad Autonoma de Madrid and University of Tennessee.   

Nicolas holds a Ph.D. in theoretical nuclear physics, an M.S. in nuclear physics and a B.S. in physics from the University of Strasbourg (France). 

Jingke Xu felt inspired to become a scientist because he enjoyed pondering problems that may or may not have answers. “As a scientist, every day brings something new — sometimes exciting and sometimes challenging,” he says, “I also try to apply scientific thinking to everyday life, both at the technological level and the sociological level.” As a father, he enjoys explaining science to a young daughter who, he estimates, asks “Why?” about 100 times a day. 

While studying for his doctorate, Jingke worked on the Borexino solar neutrino experiment and the DarkSide dark matter experiment for his dissertation. On completing his studies, he continued studying dark matter as a postdoctoral researcher. Now, working as an experimental particle physicist in the Laboratory’s Nuclear and Chemical Sciences Division, Jingke hunts for rare events including the search for dark matter particles and the detection of low-energy neutrino interactions. His day-to-day activities include developing and testing particle detection instruments, analyzing data and discussing ideas with colleagues. “LLNL provides a wonderful platform for me to pursue not only science but the applications of science,” he says.   

Jingke holds a Ph.D. in experimental particle physics from Princeton University.