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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Kernphysik / Spektroskopie
HK 41.3: Talk
Thursday, March 13, 2008, 17:15–17:30, 2G
Discovery of new n-rich isotopes and new isomers produced via Uranium projectile fragmentation and analyzed with Schottky spectroscopy at the FRS-ESR facility — •L. Chen1,2, K. Beckert1, P. Beller1, F. Bosch1, D. Boutin1,2, I. Cullen3, B. Franzke1, H. Geissel1,2, M. Hausmann4, R. Knöbel1,2, C. Kozhuharov1, S.A. Litvinov1,2, Yu.A. Litvinov1,2, Z. Liu3, F. Montes4, G. Münzenberg1, F. Nolden1, W.R. Plass2, Z. Podolyak3, C. Scheidenberger1,2, M. Shindo5, M. Steck1, B. Sun1, P.M. Walker3, H. Weick1, and M. Winkler1 — 1GSI, Darmstadt — 2JLU, Giessen — 3Uni. Surrey — 4MSU, East Lansing — 5Uni. Tokyo
A large area in the neutron-rich region 82≤ Z
≤92 has been investigated in a recent experiment with
238U projectile fragments at the FRS-ESR facility. The
fragments were separated in flight by the FRS and injected into
the storage-cooler ring ESR. The ions stored in ESR were cooled by
electron cooling and measured with time-resolved Schottky Mass Spectrometry.
5 new isotopes (e.g. 220Po and 224At) and 7 new isomers
(e.g. 213mBi,214mBi and 234mAc) have been
discovered by Schottky analysis. Furthermore, more than ten masses
have been measured for the first time. The experimental setup,
the data analysis and results will be presented. The observed new
isotopes and isomers will be discussed in more detail.