Seminar Details

New Insights into Neutron-Rich Nuclei from the 252Cf Spontaneous Fission and Development of ORISS

Shaohua Liu, Oak Ridge National Laboratory (ORNL)
Wednesday, May 1, 11:00 AM - Special Seminar
NSCL Seminar Room

The process of spontaneous fission (SF) was discovered by Petrzhak and Flerov shortly after induced fission was discovered by Hahn and Strassman. Much effort has been carried out since then to determine the half-lives and mass distributions and other such SF properties. The first study to identify the prompt gamma-rays emitted from the SF fragments was performed by Bowman et al., in 1964. SF studies have become a rich source of new insights into the nuclear structures of neutron-rich nuclei. In the first part of my talk, I will present some results of high-spin studies in neutron-rich nuclei by investigating prompt gamma-rays emitted from the SF of Cf-252 with Gammasphere. To study exotic isotopes far away stability, isobaric separation becomes a problem as the mass number increases, for stopped or low-energy Rare Isotope Beams. Isomerism has been a topic of great interest in both experiment and theory. Pure RIBs are also essential for nuclear applications, especially precise decay heat measurements. Therefore, ORISS (Oak Ridge Isomer Spectrometer and Separator), a compact time-of-flight ultra high resolution isobar and isomer spectrometer and separator, was proposed by UNINIB and funded by DOE. Its ultimate goal is to provide a mass resolving power of 400,000. In the second part of my talk, I will give an introduction of ORISS and present some results we have obtained.