Precision Mass Measurements of Rare Short-Lived Isotopes for Nuclear Physics
- Jens Dilling, TRIUMF
Wednesday, October 30, 4:10 PM - Nuclear Science Seminar
NSCL Lecture Hall
The atomic mass is a fundamental property and links directly and uniquely the binding energy to all effective forces that hold the atom together. In fact, the Nobel Prize awarded Nuclear Shell model was developed only after mass measurements indicated ‘magic’ behavior, which could not be explained with the existing theories at the time. Today, thanks to rare beam facilities, like the ISAC complex at TRIUMF or the in-flight facilities, present and future, at MSU, mass measurements are possible at far more isotopes and hence much more exotic isotopes can be accessed. Moreover, atomic masses are important parameters in nuclear astrophysics, for example for production paths of the chemical elements in stellar object. However, for the measurements, rare short-lived isotopes are required, and therefore the mass measurement systems have to be adopted.
The TITAN (TRIUMF’s Ion Trap for Atomic and Nuclear science) was developed to carry out mass measurements of very short-lived isotopes but maintaining high precision and accuracy. The measurement is carried out using a Penning ion trap, and storing one or a few ions in the trap for the experiment. In this way, some of the most exotic isotopes at any rare beam facility have been measured, and a world record in shortest half-life was achieved. I will give an overview of the TITAN program and how it links to answering some of the outstanding questions in nuclear science, present some research highlights, and give an update on the TRIUMF facilities.