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Phys. Rev. Lett. 93, 150801 (2004) [4 pages]

The Mass of 22Mg

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M. Mukherjee1, A. Kellerbauer2 *, D. Beck1, K. Blaum1,2, G. Bollen3, F. Carrel2, P. Delahaye2, J. Dilling4, S. George5, C. Guénaut6, F. Herfurth1, A. Herlert7, H.-J. Kluge1, U. Köster2, D. Lunney6, S. Schwarz3, L. Schweikhard7, and C. Yazidjian1
1GSI, Planckstraße 1, 64291 Darmstadt, Germany
2Department of Physics, CERN, 1211 Genève 23, Switzerland
3NSCL, Michigan State University, East Lansing, Michigan 48824-1321, USA
4TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
5Institut für Kernphysik, Westfälische Wilhelms-Universität, 48149 Münster, Germany
6CSNSM-IN2P3-CNRS, 91405 Orsay-Campus, France
7Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany

Received 16 June 2004; published 8 October 2004

Mass measurements with a relative precision of better than 1.5×10-8 were performed on 22Mg and its reaction partners 21Na and 22Na with the ISOLTRAP Penning trap mass spectrometer at CERN, yielding the mass excesses D(22Mg)=-399.92(27)   keV, D(21Na)=-2184.71(21)  keV, and D(22Na)=-5181.56(16)  keV. The importance of these results is twofold. First, a comparative half-life (Ft value) has been obtained for the superallowed β decay of 22Mg to further test the conserved-vector-current hypothesis. Second, the resonance energy for the 21Na proton capture reaction has been independently determined, allowing direct comparisons of observable γ radiation in nova explosions with the yield expected from models.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.93.150801
DOI: 10.1103/PhysRevLett.93.150801
PACS: 21.10.Dr, 23.40.Bw, 26.30.+k, 27.30.+t

* To whom correspondence should be addressed. Electronic address: a.kellerbauer@cern.ch

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