Schottky Mass Measurements of Cooled Proton-Rich Nuclei at the GSI Experimental Storage Ring
- Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt (Germany)
- Sektion Physik, Ludwig-Maximilians-Universitaet Muenchen, Am Coulombwall, D-85748 Garching (Germany)
- College of General Education, Osaka University, Osaka 560 (Japan)
- II. Physikalisches Institut, Universitaet Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen (Germany)
- St. Petersburg Nuclear Physics Institute, Gatchina 188350 (Russia)
High-precision mass measurements of proton-rich isotopes in the range of 60{le}Z{le}84 were performed using the novel technique of Schottky spectrometry. Projectile fragments produced by {sup 209}Bi ions at 930{ital A} MeV were separated with the magnetic spectrometer FRS and stored and cooled in the experimental storage ring (ESR). A typical mass resolving power of 350000 and a precision of 100keV were achieved in the region A{approx}200 . Masses of members of {alpha} chains linked by precise Q{sub {alpha}} values but not yet connected to the known masses were determined. In this way it is concluded that {sup 201}Fr and {sup 197}At are proton unbound. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 549675
- Journal Information:
- Physical Review Letters, Vol. 78, Issue 25; Other Information: PBD: Jun 1997
- Country of Publication:
- United States
- Language:
- English
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