[Triumf-seminars] TRIUMF Nuclear Physics Seminar today at 10:00

[TRIUMF Seminars]

Date/Time: Fri 2018-10-05 at 10:00

Location:  Auditorium          

Speaker:   Timo Dickel (Justus-Liebig-University Giessen, Germany / GSI Helmholtz Center for Heavy Ion Research)

Title:     FRS Ion Catcher at GSI/FAIR -- Results, Spin-offs and Recent Developments

Abstract: At the FRS Ion Catcher at the FRS at GSI/FAIR for the first time projectile and fission fragments that are produced at relativistic energies have been separated in-flight, range-focused, slowed-down and thermalized in a cryogenic stopping cell. Thereby cooled beams of high purity can be provided. These beams are  transmitted to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS), which achieves mass resolving powers beyond 600,000 (FWHM), high transmission efficiency, ion capacities of more than a million ions per second, and cycle frequencies has high as 1 kHz. The MR-TOF-MS can perform direct mass measurements of exotic nuclei, provide an isobarically and isomerically clean beam for further experiments, and can be used as a versatile diagnostics device to monitor the production, separation and manipulation of exotic nuclei.
More than 30 short-lived ground state masses have been measured with high mass accuracies (uncertainties down to 6E-8). The excitation energies of isomers and isomeric ratios were determined using mass spectrometry, and, for the first time, an isomeric beam was prepared using an MR-TOF-MS. The unique combination of performance parameters make the MR-TOF-MS the system of choice for measuring the masses of very exotic nuclei and for the search for new long-lived isomeric states. This is the basis for a broad scientific program in FAIR phase-0, including measurements of masses for the 3rd peak of the r-process and N=Z nuclei below 100Sn, beta-delayed neutron emission probabilities and multi-nucleon transfer reactions.
On the basis of the MR-TOF-MS at the FRS similar devices have been developed for the TITAN experiment at TRIUMF and for in-situ analytical mass spectrometry (e.g. waste water monitoring and in-vivo diagnostics). In this talk, the different mass spectrometers, their applications and recent results as well as recent developments in electronics, system control and data-analysis procedures will be presented.




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