Berlin 2005 – wissenschaftliches Programm

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MS: Massenspektrometrie

MS 9: Pr
äzisions-MS kurzlebiger Nuklide 2

MS 9.1: Vortrag

Montag, 7. März 2005, 16:15–16:30, HU Senatssaal

The mass of ²²Mg — •Manas Mukherjee¹, D. Beck¹, K. Blaum^1,2, G. Bollen³, F. Carrel⁴, P. Delahaye⁴, J. Dilling⁵, S. George², C. Guénaut⁶, F. Herfurth¹, A. Herlert^4,7, A. Kellerbauer⁴, H.-J. Kluge¹, U. Köster⁴, D. Lunney⁶, S. Schwarz³, L. Schweikhard⁷, and C. Yazidjian⁴ — ¹GSI, 64291 Darmstadt, Germany — ²Johannes Gutenberg-Universität, 55099 Mainz, Germany — ³NSCL, Michigan State University, East Lansing, MI 48824-1321, USA — ⁴CERN, 1211 Geneva 23, Switzerland — ⁵TRIUMF, Vancouver, V6T 2A3, Canada — ⁶CSNSM-IN2P3-CNRS, 91405 Orsay-Campus, France — ⁷Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany

Direct high-precise mass measurements around mass number A = 22 are of utmost importance. First, the masses of the superallowed β−emitter ²²Mg and its daughter ²²Na are needed to test the CVC hypothesis and the CKM-matrix unitarity, both being predictions of the Standard Model. Second, to calculate the reaction rate of ²¹Na(p,γ)²²Mg the involved masses are required. This rate is needed in order to extract an upper limit on the amount of a characteristic γ−radiation emitted from classical nova bursts which has been searched for but not yet detected. At the triple trap mass spectrometer ISOLTRAP, the masses of ²¹Na, ²²Na, and ²²Mg have been measured with relative uncertainties of better than 1.5×10⁻⁸. This solved a conflict between two available mass values for ²²Mg. The mass measurements as well as their impact will be presented.