Nuclear structure studies of short-lived neutron-rich nuclei with the novel large-scale isochronous mass spectrometry at the FRS-ESR facility
✍ Scribed by B. Sun; R. Knöbel; Yu.A. Litvinov; H. Geissel; J. Meng; K. Beckert; F. Bosch; D. Boutin; C. Brandau; L. Chen; I.J. Cullen; C. Dimopoulou; B. Fabian; M. Hausmann; C. Kozhuharov; S.A. Litvinov; M. Mazzocco; F. Montes; G. Münzenberg; A. Musumarra; S. Nakajima; C. Nociforo; F. Nolden; T. Ohtsubo; A. Ozawa; Z. Patyk; W.R. Plaß; C. Scheidenberger; M. Steck; T. Suzuki; P.M. Walker; H. Weick; N. Winckler; M. Winkler; T. Yamaguchi
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 345 KB
- Volume
- 812
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
The previously pioneered Isochronous Mass Spectrometry (IMS) has been extended by an additional precise magnetic-rigidity determination to enable accurate large-scale measurements of stored short-lived relativistic nuclei with the FRS-ESR facility at 382 MeV/u. With this novel experimental tool the mass resolving power and accuracy have been improved by a factor of about 3. The recorded broad-band revolution time spectrum corresponds to the mass-over-charge range of about 6%. A mass resolving power of 200 000 (FWHM) and a typical accuracy of 120 keV have been achieved almost over the entire spectrum. The masses of 35 neutron-rich nuclides have been directly measured in the element range from aluminum to barium. The Masses of 8 nuclides ( 85,86 As, 89 Se, 123 Ag, 138 Te, 140,141 I, 143 Xe) have been measured for the first time. The results are compared with previous experimental data and theoretical predictions. The evolution of the N = 50 shell closure towards doubly-magic 78 Ni is discussed.