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HK: Hadronen und Kerne

HK 23: Kernspektroskopie, leichte Kerne II

HK 23.5: Vortrag

Dienstag, 25. März 1997, 15:45–16:00, HS E

New Results on Neutron-Rich Ni-Isotopes Produced with a Laser- Ion-Source — •A. W"ohr, J. Breitenbach, S. Franchoo, M. Huyse, Y. Kudryavtsev, A. Piechaczek, I. Reusen, R. Raabe, P. Van Duppen, and L. Vermeeren — Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium

Short-lived neutron-rich Ni-isotopes have been studied at the Leuven Isotope Separator On-Line (LISOL) using a chemically selective Ion Guide Laser Ion Source (IGLIS) based on resonant ionisation of atoms [1]. The β-decay properties of different Ni-isotopes have been studied by the means of β γ-spectroscopy.
The neutron-rich Ni-isotopes are produced by proton induced fission (E_p = 65 MeV) of ²³⁸U. In the Helium gas of the ion guide the fission-products are neutralised before they are ionised with a two step laser exciation. After the laser ionisation they are mass separated and detected. The fission cross sections of ⁶⁹⁻⁷³Ni were deduced from β- and β-gated γ-spectra. In the present experiment it was possible to observe for the first time γ-rays for ⁷¹Ni, even in the case of mass 73 there is some evidence for one possible γ- line. Comparing spectra on-resonance and off-resonance it can be seen, that the observed Cu activity is only produced by the decay of the Ni- isotopes. The results will be presented and discussed in detail.

[1] Y. Kudryavtsev et al.; Nucl. Instr. & Meth. B 114 (1996) 350–365