A Robert Klapisch’s article awarded by AAAS

5 February 2018
The American Association for the Advancement of Sciences for its 125th Anniversary decided to designate every year most important scientific article. In this prestigious list the article wrote by C. Thibault, R. Klapisch, C. Rigaud, A. M. Poskanzer, R. Prieels, L. Lessard, and W. Reisdorf has been chosen for 1975, for its discoveries on very rich neutrons nuclei at CERN.

Direct measurement of the masses of 11Li and 2632Na 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.

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