=Date and Place=
Jul. 31st(Tue) 13:30~ at Nishina Hall
Prof. Michiharu Wada
(Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization)
The Multi-Reflection Time-Of-Flight Mass Spectrographs at RIBF: Present and Future
The exotic isotopes 249-253Md  as well as many other rare isotopes of heavy- [2,3] and intermediate-mass nuclei  – 80 isotopes in total – have successfully been measured with a multi-reflection time-of-flight mass spectrograph (MRTOF-MS) at the GARIS-II facility. In the series of experiments, we showed that the mass spectrograph can precisely and accurately measure atomic masses with high efficiency even for very short-lived isotopes having a half-life of 10 ms. After successful completion of the first campaign, we are expanding to have mass spectrographs at multiple facilities such as the new GARIS-II, KISS, and BigRIPS+SLOWRI, to perform comprehensive mass measurements of all available nuclides at RIBF. The flagship experiment will be for hot-fusion superheavy nuclides, in particular 288Mc and 284Nh. The mass spectrograph can be used not only for mass measurements, but also for many other applications: MRTOF assisted resonant laser ionization spectroscopy, MRTOF assisted decay spectroscopy, delayed neutron emission probability studies without neutron detection, the simultaneous identification of A and Z in multiple fission fragments, and so on.
In this seminar, we review the present status and discuss the ongoing projects and future prospects.
 Y. Ito et al., Phys. Rev. Lett. 120, 102501 (2018)
 M. Rosenbusch et al., Phys. Rev. C 97, 064306 (2018)
 P. Schury et al., Phys Rev. C 95, 011305R (2017)
 S. Kimura et al., Int. J. Mass Spectom. 430, 134-142 (2018)