Un article de Robert Klapisch primé par AAAS

L’American Association for the Advancement of Sciences pour son 125ème anniversaire a décidé de désigner chaque année l’article scientifique le plus important. Dans cette liste prestigieuse l’article rédigé par C. Thibault, R. Klapisch, C. Rigaud, A. M. Poskanzer, R. Prieels, L. Lessard, et W. Reisdorf figure au titre de 1975 pour ces découvertes faites au CERN de noyaux très riches en neutrons.

Direct measurement of the masses of $11\mathrm{Li}$ and $26-32\mathrm{Na}$ with an on-line mass spectrometer

Abstract

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

DOI:https://doi.org/10.1103/PhysRevC.12.644

©1975 American Physical Society

C. Thibault, R. Klapisch, C. Rigaud, A. M. Poskanzer^*, R. Prieels^†, L. Lessard^‡, and W. Reisdorf^§

• ^*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.