Osnabrück 2002 – wissenschaftliches Programm
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MS: Massenspektrometrie
MS II: HV II
MS II.1: Hauptvortrag
Mittwoch, 6. März 2002, 14:40–15:20, HS 02/E04
Accurate atomic masses: Status and perspectives of Penning trap measurements — •Klaus Blaum — GSI, Darmstadt, Germany
There are many reasons for high-accuracy mass measurements of stable and unstable isotopes: For stable masses it ranges from establishing a reliable backbone of known masses along the line of beta-stability, providing masses important for metrology such as fundamental constants, or for measuring atomic binding energies in order to test atomic theory and QED. Recent results from MIT (Cambridge) and SMILETRAP (Stockholm) demonstrate precisions of 0.2 ppb or better [1,2]. Detailed studies of nuclear binding far from the valley of stability with precisions in the 10−7 − 10−8 range are performed with ISOLTRAP (ISOLDE/CERN, Geneva) [3]. These measurements allow direct observation of nuclear structure effects like the location of shell and sub-shell closures, pairing, or the onset of deformation. Furthermore unstable masses play an important role in the understanding of nuclear astrophysical processes and for the test of fundamental interactions. Future upcoming or planned facilities for Penning trap mass spectrometry such as CPT (ANL, Argonne), SHIPTRAP, HITRAP (both GSI, Darmstadt), JYFLTRAP (JYFL/Jyväskylä), LEBIT (NSCL/MSU, East Lansing) and TRIUMF-TRAP (TRIUMF, Vancouver) will be presented and discussed.
[1] M.P. Bradley et al., Phys. Rev. Lett. 83 (1999) 4510
[2] T. Fritioff et al., Eur. Phys. J. D 15 (2001) 141
[3] G. Bollen, Nucl. Phys. A 693 (2001) 3