Mainz 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 15: Precision Mass Spectrometry (joint session MS/Q)
Q 15.5: Vortrag
Montag, 2. März 2026, 18:15–18:30, N 6
Mass measurements of neutron-deficient nuclides close to the N = Z line with the FRS Ion Catcher — •Nived Keeppalli1 and Gabirella K.Koncz1,2 for the Super-FRS Experiment collaboration — 1II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Germany — 2School of Physics and Astronomy, University of Edinburgh, United Kingdom
Mass measurements near the N = Z line were performed with the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) at the FRS Ion Catcher at GSI Darmstadt. The MR-TOF-MS enables high precision mass measurements of exotic species having few ms half-life and low production cross sections (∼nb), with high mass resolving power (106) and accuracy (δm/m ≈ 10−8).
In this contribution, results from the measurement campaigns carried out near the N = Z line will be presented, including the first direct mass measurement of 93Pd, the one-proton-decay daughter of the (21+) isomer in 94Ag, reducing the mass uncertainty by an order of magnitude. The results indicate that the excitation energies of the parent states responsible for the one-proton (1p) and two-proton (2p) decays in 94Ag differ by 10 standard deviations, pointing towards an incompatibility in the previously reported decay scheme of the 1p and 2p branches. Moreover, the possibility of the existence of two structurally different, high-spin states in 94Ag, feeding the 1p and 2p decay branches was studied, performing state-of-the-art shell-model and mean-field calculations.
Keywords: FRS Ion Catcher; Precision mass spectrometry; time of flight mass spectrometer; Mass measurements; N=Z line