Direct measurement of the masses of 11Li and 26−32Na with an on-line mass spectrometer
The use of an on-line mass spectrometer to make direct mass measurements of short-lived isotopes far from the stability line has been improved to yield more accurate mass measurements for 27−30Na, new mass measurements for 11Li, 31,32Na, and to remove a discrepancy between existing mass measurements of 26Na. The mass excesses (keV) measured are: 11Li, 40940±80; 26Na, -6901±25; 27Na, -5620±60; 28Na, -1140±80; 29Na, 2650±100; 30Na, 8370±200; 31Na, 10600±800; 32Na, 16400±1100. The 11Li value indicates that it is bound by only 170±80 keV. The masses of 31Na and 32Na imply that these nuclei are more tightly bound than expected from theoretical predictions.
NUCLEAR STRUCTURE 11Li, 26−32Na; measured atomic masses. On-line mass spectrometer.
RADIOACTIVITY 11Li; deduced logft.
- Received 17 March 1975
©1975 American Physical Society
- *Permanent address: Lawrence Berkeley Laboratory, Berkeley, California.
- †Permanent address: Institut de Physique Corpusculaire Université de Louvain, Louvain-la-Neuve, Belgium.
- ‡France-Quebec postdoctoral fellow 1972-1973. Present address: Foster Radiation Laboratory, McGill University, Montreal, Canada.
- §Permanent address: Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany.