Speaker
Description
The nuclear data of neutron-rich nuclei, e.g., mass, lifetime, and neutron-capture cross section, are important for understanding the rapid neutron-capture (r-) process, because a balance of net neutron-capture rate and β–decay rate is crucial to determine its path. It is difficult to access the r-process nuclei due to their locations far from stability; thus, theoretical predictions are needed to obtain the final isotopic abundances. However, in the region where there are no experimental data on nu- clear masses, the predicted mass values show a large variance. To improve them, accurate and precise mass and nuclear data of neutron-rich nuclei are required.
At RIKEN, the studies of neutron-rich unstable nuclei produced by the spontaneous fission of ${}^{252}$Cf has been performed with a multi-reflection time-of-flight mass spectrometer (MRTOF-MS), which has been developed for not only mass measurement but also isobar separation. The experimental setup consists of a cryogenic helium gas-cell, a suite of ion traps, and the MRTOF-MS. We have achieved extraction form the gas-cell and observation of more than 250 isotopes so far. In this presentation, we report the recent results of the mass measurements of neutron-rich unstable nuclei and, in addition, other related studies with the MRTOF-MS.
| Please select a main topic related to your abstract | Experimental Nuclear Physics for Astrophysics |
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