Abstract
The value of the double beta decay has been determined by measuring the masses of and in a Penning trap using neon- and fluorinelike ions. The obtained masses are 75.921 402 758(96) u and 75.919 213 795(81) u, respectively. The systematic errors of these two determinations are nearly equal, and therefore, the remaining systematic uncertainty of the value is drastically reduced. A value of 2 039.006(50) keV was obtained improving the accuracy of the accepted value by a factor of 6.
- Received 11 September 2000
DOI:https://doi.org/10.1103/PhysRevLett.86.4259
©2001 American Physical Society