Energy levels of A = 21−44 nuclei (V)

Light dripline nuclei

Development and applications of the IGISOL technique

Laser spectroscopy for nuclear structure physics

An ion beam cooler for mass-separated radioactive ion beams has been developed and tested at the IGISOL-type mass separator facility Technical description and characteristic properties are presented An energy spread below 1 eV and transmission efficiency of 60% were measured

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Beam cooler for low-energy radioactive ions

Transportation of thermalized primary recoil ions from nuclear reactions by helium flow has been investigated as a means of injecting short-lived radioactive nuclides into an on-line isotope separator. Several short-lived radioactive isotopes of highly nonvolatile elements such as B, Sc, Nb, and W have been separated. The efficiency for heavy nuclides with half-lives above 1 ms is between 1 and 10%. The shortest-lived activity identified in an on-line separation is the 182-\ensuremath{\mu}s isomeric state in $^{207}\mathrm{Bi}$.

Submillisecond on-line mass separation of nonvolatile radioactive elements: An application of charge exchange and thermalization processes of primary recoil ions in helium.

A new ISOL method, the IGISOL (Ion Guide Isotope Separator On-Line), permits thermalized primary recoil ions produced in nuclear reactions to be run directly through a mass separator without a conventional ion source. It allows a fast (≳ 100 μs) separation of various radioactive isotopes of both volatile and nonvolatile elements. The overall separation efficiencies measured for heavy nuclides produced in light ion induced reactions are up to 10%. The shortest-lived activity identified in an on-line separation is the 182 μs isomeric state of 207Bi.

The ion guide isotope separator on-line, IGISOL

Levels in 110Pd, 112Pd, 114Pd and 116Pd from the beta decays of the on-line mass separated Rh isotopes

Collective structure of the neutron-rich nuclei, 110Ru and 112Ru

A new ISOL technique, the ion guide method for isotope separation, has been developed. The method is based on thermalization of primary recoil ions from nuclear reactions in helium and on their transfer by helium flow through a differential pumping system into the accelerating stage of an isotope separator. With this approach, separation times in the submillisecond region are achievable for all elements. The ion guide has no ionizer but instead exploits charge exchange mechanisms related to nuclear reactions and recoil thermalization processes. Operation takes place at room temperature and the simple construction involves no components that can wear out. These properties ensure smooth and stable operating conditions. The overall separation efficiencies measured for heavy nuclides produced by light-ion reactions are up to 10%. The shortest-lived activity identified in an on-line separation is the 182-μs isomeric state of 207Bi. The production rate of the mass separated 440-μs isomeric state of 43Sc is ≈ 2 × 103 ions/μC.

P. Taskinen

Papers

Submillisecond on-line mass separation of nonvolatile radioactive elements: An application of charge exchange and thermalization processes of primary recoil ions in helium.

The ion guide isotope separator on-line, IGISOL

Levels in 110Pd, 112Pd, 114Pd and 116Pd from the beta decays of the on-line mass separated Rh isotopes

Collective structure of the neutron-rich nuclei, 110Ru and 112Ru

Ion guide method for on-line isotope separation