Berlin 2001 – wissenschaftliches Programm

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MS: Massenspektrometrie

MS VI: HV VI

MS VI.1: Hauptvortrag

Freitag, 6. April 2001, 16:15–16:45, EB 202

High-Precision Mass Measurements of Short-Lived Nuclides — •A. Kellerbauer^1,2, F. Ames³, G. Audi⁴, D. Beck⁵, G. Bollen⁶, J. Dilling⁵, O. Engels³, F. Herfurth^3,5, H.-J. Kluge⁵, D. Lunney⁴, R. B. Moore², M. Oinonen⁷, C. Scheidenberger⁵, S. Schwarz⁶, G. Sikler⁵, J. Szerypo⁷, and C. Weber⁵ — ¹CERN, Genève — ²McGill University, Montréal — ³LMU, München — ⁴CSNSM, Orsay — ⁵GSI, Darmstadt — ⁶NSCL, East Lansing — ⁷JYFL, Jyväskylä

The Penning trap mass spectrometer ISOLTRAP at the on-line isotope separator ISOLDE/CERN is dedicated to high-precision mass measurements of radioactive nuclides. A measurement of the true cyclotron frequency of the ions in the electromagnetic Penning trap yields mass determinations with typical relative precisions of δ m m ≈ 10⁻⁷. By measuring the masses of ³³Ar and ⁷⁴Rb, we have shown that nuclides with half-lives well below one second [T_{1 2}(³³ Ar) = 174 ms, T_{1 2}(⁷⁴ Rb) = 65 ms] can be measured in Penning traps with a relative precision of δ m m ≈ 3 · 10⁻⁷. Furthermore, we have been able to measure the masses of ³⁴Ar and ⁷⁴⁻⁷⁸Kr with a relative precision of δ m m ≈ 3 · 10⁻⁸. The masses of these nuclides are important in the systematic study of superallowed β decays which are essential for testing the conserved vector current (CVC) hypothesis as well as the unitarity of the CKM matrix.