Seminars

Thursday, Feb 21 at 11:00 AM
1200 FRIB Laboratory
Andrew Miller, NSCL
Charge radii of neutron-deficient calcium isotopes
Saturday, Feb 23 at 10:30 AM
1300 FRIB Laboratory
Angela Wilson, John A. Hannah Distinguished Professor of Chemistry
The Transforming Power of the Periodic Table and How It Impacts Our Everyday Lives

Abstract:  The periodic table of elements provides the collection of puzzle pieces (elements) that form everything—from the food we eat to the cars we drive. As we have learned more about each of the puzzle pieces, the impact has been tremendous on the economy, on national security, and on our lives, from the development of new technologies to strategies towards improved health. This talk will provide a walk through the elements, with a significant focus on lesser known parts of the periodic table, demonstrating how the knowledge we have gained has been so impactful upon our everyday lives. Challenges and opportunities that drive our quest for further understanding of the elements will also be addressed.​

Monday, Feb 25 at 2:00 PM
1400 Biomedical and Physical Sciences Building
Abbie Stevens Louis Wagner and, Michigan State University
JINA-CEE Science Cafe Topic: X-ray bursts and accreting neutron stars
Wednesday, Feb 27 at 4:10 PM
1200 FRIB Laboratory
Scott Suchyta, Remote Sensing Laboratory
Radiological/nuclear emergency-response science at the Remote Sensing Laboratory

Abstract:  The mission of the DOE/NNSA Office of Emergency Response is to provide a versatile, capable, worldwide nuclear or radiological response with the technical capability to respond to any radiological/nuclear incident worldwide. Scientists at the Remote Sensing Laboratory (RSL) play an important role in this mission, serving on a variety of response teams. An overview of various radiological emergency-response assets will be given, with a primary focus on the expertise of RSL. Current capabilities and operational challenges in the topic areas of both crisis response (radiological search, identification, characterization, etc.) and consequence management (response to and mitigation of incidents) will be discussed. A wide range of radiation-detection platforms, including backpacks, vehicle-mounted systems, and aircraft-mounted systems will also be presented.

Wednesday, Mar 06 at 12:00 PM
1200 FRIB Laboratory
Dean Lee, FRIB
Simulating Nuclei from Scratch
Monday, Mar 11 at 12:30 PM
1400 Biomedical and Physical Sciences Building
Christopher Fontes, Los Alamos National Laboratory
A link between atomic physics and gravitational wave spectroscopy

Abstract:  Neutron star mergers are promising candidates for the observation of an electromagnetic (EM) signal coincident with gravitational waves. The recent observation of GW170817 [1] appears to be such an event, with gravitational waves confirmed by subsequent EM signals ranging from the infrared to x-ray portions of the spectrum. The properties of the ejecta produced during these events are predicted to play an important role in the electromagnetic transients called macronovae or kilonovae. Characteristics of the ejecta include large velocity gradients and the presence of heavy r-process elements, which pose significant challenges to the accurate calculation of radiative opacities and radiation transport. For example, these opacities include a dense forest of bound-bound features arising from near-neutral lanthanide and actinide elements. We use the Los Alamos suite of atomic physics and plasma modeling codes [2] to investigate the use of detailed, fine-structure opacities [3] to model the EM emission from macronovae. Our simulations [4] predict emission in a range of EM bands, depending on issues such as the presence of winds, elemental composition, and viewing angle. This talk emphasizes various atomic-physics aspects of the spectral modeling of neutron star mergers.

Tuesday, Mar 19 at 11:00 AM
1200 FRIB Laboratory
Alexander Tichai, CEA Saclay
Theory Seminar - Title to be announced
Wednesday, Mar 20 at 4:10 PM
1200 FRIB Laboratory
Maxime Brodeur, University of Notre Dame
Precision measurements of mirror transitions at the Nuclear Science Laboratory

Abstract:  Despite its success, the Standard Model (SM) is currently being scrutinized at the energy, intensity and precision frontier. One probing mechanism for new physics is the unitarity test of the Cabibbo-Kobayashi-Maskawa matrix. This test requires a precise and accurate determination of the Vud matrix element, which is currently derived from the ft-value of superallowed weak decays. While superallowed pure Fermi transitions currently allow for the most precise determination of Vud, there is currently a growing interest in obtaining that matrix element from superallowed mixed transitions to test the accuracy of Vud and the calculation of isospin symmetry breaking corrections. In the past few years a research program aimed at solidifying the determination of Vud from mirror transitions was initiated using radioactive ion beams from the Twin Solenoid (TwinSol) separator at the Nuclear Science Laboratory of the University Notre Dame. The first part of the program is centered on precision half-life measurements and the second part aims at measuring the Fermi to Gamow-Teller mixing ratio ρ. Recent half-life measurements and the current development status of an ion trapping system to measure ρ in many mirror decays for the first time will be presented.