SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Structure and Dynamics of Nuclei I
HK 15.3: Vortrag
Dienstag, 31. August 2021, 17:30–17:45, H4
High-precision mass measurements in the direct vicinity of the doubly magic 100Sn(N=Z=50) at ISOLDE/CERN — •Jonas Karthein for the ISOLTRAP collaboration — CERN, 1211 Geneva, Switzerland — Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — present address: Massachusetts Institute of Technology, Cambridge, MA 02139, USA
This contribution reports on high-precision mass measurements of 99−101In isotopes and isomers with the ISOLTRAP mass spectrometer at ISOLDE/CERN. Applying the Multi-Reflection Time-of-Flight (MRToF) method, the masses of 99In and 100In (the β-decay daughter of 100Sn) were measured for the first time with high precision. Additionally, the recently implemented Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique [S. Eliseev et al. PRL 110 (2013) 082501] will be discussed in the context of these measurements. This revolutionary Penning-trap mass spectrometry technique allowed for the first time a direct mass determination of both the ground and the isomeric states of 101In in a Penning trap with resolving powers exceeding m/Δm > 5*105 in only 62 ms phase-accumulation time. Our mass spectrometry results, recently accepted for publication in Nature Physics, will be compared with pioneering ab-initio many-body calculations in this heavy mass region. The 100-fold improvement in the precision of the 100In mass value highlights a discrepancy in the so-far published atomic mass values of 100Sn, which could previously only be derived from β-decay results.