1. Nuclear structure studies of short-lived neutron-rich nuclei with the novel large-scale isochronous mass spectrometry at the FRS-ESR facility
- Author
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Sun, B., Knöbel, R., Litvinov, Yu.A., Geissel, H., Meng, J., Beckert, K., Bosch, F., Boutin, D., Brandau, C., Chen, L., Cullen, I.J., Dimopoulou, C., Fabian, B., Hausmann, M., Kozhuharov, C., Litvinov, S.A., Mazzocco, M., Montes, F., Münzenberg, G., and Musumarra, A.
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MASS spectrometry , *NUCLEAR structure , *NEUTRONS , *NUCLIDES - Abstract
Abstract: 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 (85,86As, 89Se, 123Ag, 138Te, 140,141I, 143Xe) have been measured for the first time. The results are compared with previous experimental data and theoretical predictions. The evolution of the shell closure towards doubly-magic 78Ni is discussed. [Copyright &y& Elsevier]
- Published
- 2008
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