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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Kernphysik / Spektroskopie

HK 46.3: Talk

Thursday, March 15, 2007, 14:45–15:00, B

Schottky Mass and Half-life Measurements of Neutron-rich Nuclides — •L. Chen^1,2, K. Beckert¹, P. Beller¹, F. Bosch¹, D. Boutin^1,2, R.S. Chakrawarthy³, B. Franzke¹, H. Geissel^1,2, R. Knöbel^1,2, C. Kozhuharov¹, S.A. Litvinov^1,2, Y.A. Litvinov^1,2, Z. Liu⁴, F. Montes⁵, G. Münzenberg¹, F. Nolden¹, W. Plass², Z. Podolyak⁴, C. Scheidenberger^1,2, M. Shindo⁶, M. Steck¹, G. Vorobjev¹, P.M. Walker⁴, H. Weick¹, and M. Winkler¹ — ¹GSI, Darmstadt — ²JLU, Giessen — ³TRIUMF, Vancouver — ⁴Uni. Surrey — ⁵MSU, East Lansing — ⁶Uni. Tokyo

Masses and half-lives of a large number of neutron-rich nuclei in the element range from U to Tl were measured in a recent Schottky run.

These nuclides were produced by fragmenting ²³⁸U primary beam with intensities of up to 2·10⁹ ions/spill in Be (4g/cm²) production target at the entrance of the Fragment Separator FRS. The neutron-rich projectile fragments were separated by the FRS and injected into the Experimental Storage Ring ESR. The stored ions were electron-cooled, and their revolution frequencies and intensities have been measured with time-resolved Schottky Mass Spectrometry (SMS).

We have identified 4 new isotopes and meansured the masses of tens of isotopes for the first time. For the new isotope ²³⁵Ac also the half-life has been measured in addition. The principle of mass and half-life measurements by using SMS will be discussed, and the status of our data analysis will be presented.