Present status and expected evolution of LISOL, the Leuven isotope separator on-line

doi:10.1016/0029-554X(81)90893-4

Nuclear Instruments and Methods in Physics Research

Volume 186, Issues 1–2, 1 July 1981, Pages 99-103

https://doi.org/10.1016/0029-554X(81)90893-4 Get rights and content

Abstract

Since the first on-line experiment in May 1975, LISOL has developed into a reliable instrument thanks to the continuous improvement of the “CYCLONE” cyclotron beams, the separator ion-sources, the beam-handling techniques and the nuclear detection techniques.

The isochronous cyclotron “CYCLONE” at Louvain-la-Neuve can accelerate projectiles ranging from protons to Ar ions. With a new cyclotron ion source under construction it is expected to extend the charge state (and thus the energy), the current and the number of heavy ions available.

At present five types of separator ion sources are in use, each with its favourably ionized element or group of elements, thus offering the possibility for a limited Z-selection. These are: a one filament (Cd) and a three filament Nielsen source (Ag and In), with improved heat shielding, two types of Febiad sources (Sn and In) and a new small volume source for elements with a low ionisation potential. Different targets in foil- or powder form have been tested.

Until now only one group, doing nuclear spectroscopy on neutron deficient nuclei in the vicinity of Z = 50, N = 50, has been using the LISOL separator beam. They have a fast tape system, which has been extended for three or four detector coincidence measurements, and a multimass collecting system at their disposal.

Two new teams, one doing on-line nuclear orientation and the other one collinear, Doppler-free laser spectroscopy are putting their apparatus behind the separator; several changes in the beam handling system have been carried out or are planned for them.

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Cited by (12)

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The mass separator LISOL, on-line to the CYCLONE cyclotron, is described as it is presently configured. Improvements in the cyclotron beams are mentioned, and separator developments to accommodate the various experimental stations are presented. Modifications to the separator to permit ion guide operation are given. Yields of some short-lived isotopes are presented, for heavy-ion induced reactions.
Radioactive ion beams available at on-line mass separators
1987, Nuclear Inst. and Methods in Physics Research, B
Today new rapid separation methods, based on thermochemical and physical principles, allow radioactive nuclei of almost all elements to be continuously transformed from an accelerator target into an ion beam. These techniques, often referred to as target and ion-source systems, have in the last 20 years turned on-line mass separators into the most efficient tool for production and study not only of nuclei far from stability but radioactive nuclei in general.
The present paper summarizes the status of this field in terms of elements available as ion beams, overall efficiency, intensity, selectivity, and speed. By means of examples selected from the ongoing development work at many on-line separator laboratories, the prospects for improving existing systems and extension to further elements are assessed.
Low-lying Jπ=0+ states in 190,192Pb populated in the α-decay of 194,196Po
1985, Physics Letters B
A semiconductor beta ray spectrometer
1983, Nuclear Instruments and Methods In Physics Research
The design and construction of a beta spectrometer which uses a hyper-pure germanium crystal for energy determination is described. Due to the good energy resolution that is achieved, end points of continuous beta spectra can be measured accurately, even if the nuclides have short half-lives. The spectrometer is therefore especially suited for atomic mass determination in on-line mass separator experiments. A simple wire chamber is used to discriminate beta particles from gamma radiation. Disadvantages arise from the large amounts of scattered beta particles, deforming the continua; a method is described to minimize this scattering.
The result of a first measurement is presented.
Nuclear orientation of neutron deficient isotopes in the Z = 50 region
1983, Nuclear Physics, Section A
The first low temperature nuclear orientation measurements on electromagnetically separated short lived nuclei $(5.1 min. ⩽ t_{12} ⩽ 58 min.)$ are presented. A systematic magnetic moment study of the series ^105–108In and of ^101–102Ag has been performed. This investigation permitted to deduce ground state characteristics. The spin values of the high spin isomers of the odd-odd indiums have been fixed.
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^∗: Aspirant NFWO.

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Nuclear Instruments and Methods in Physics Research

Abstract

References (6)

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Cited by (12)

Status report of the Leuven Isotope Separator On-Line (LISOL)

Radioactive ion beams available at on-line mass separators

Low-lying J<sup>π</sup>=0<sup>+</sup> states in <sup>190,192</sup>Pb populated in the α-decay of <sup>194,196</sup>Po

A semiconductor beta ray spectrometer

Nuclear orientation of neutron deficient isotopes in the Z = 50 region

Recent developments at the Leuven isotope separator on line