Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 60: Instrumentation VI, Detector Systems
HK 60.7: Talk
Thursday, March 19, 1998, 16:00–16:15, A
A Compact Apparatus for Mass Selective Resonance Ionization Spectroscopy of Trans-Einsteinium Elements in a Buffer Gas Cell — •M. Sewtz1, H. Backe1, R. Feldmann1, M. Hies1, T. Kolb1, H. Kunz1, W. Lauth1, H. Schöpe1, Th. Schütze1, P. Schwamb1, A. Steinhof1, P. Thörle2, N. Trautmann2, G. Gwinner3, and D. Schwalm3 — 1Institut für Kernphysik, Institut für Physik and — 2Institut für Kernchemie der Universität Mainz, D-55099 Mainz — 3Max-Planck-Institut für Kernphysik, D-69029 Heidelberg
An ultra sensitive laser spectroscopic method for the investigation of
trans-einsteinium nuclides has been developed
based on resonance ionization in an argon buffer gas cell. This method has
been combined with
ion-guide extraction and mass selective direct
detection of the resonantly ionized atoms.
Using argon as a buffer gas, the
fusion reaction products can be thermalized
even at low pressure.
Resonance ionization will be performed
using a two step excitation with an excimer-dye-laser combination.
The ions are transported by an electrical field to the nozzle, are
ejected with the gas jet into a RF-quadrupole ion guide (QPIG),
and analyzed by a quadrupole mass spectrometer.
First experiments will be performed at fermium (Z=100) for which
no atomic levels are known.
The 251Fm nuclide will be produced by an (α,2n) reaction at the
MP-Tandem accelerator facility of the MPI für Kernphysik in Heidelberg.
A status report of the experiment is given.
Work supported by BMBF(06 MZ 863I9).