Recent development of high-temperature metal targets for ISOLDE

Björnstad, T.; Hagebø, E.; Hoff, P.; Jönsson, O.; Kugler, E.; Ravn, H.L.; Sundell, S.; Vosicki, B.

doi:10.1016/0168-583x(87)90747-6

Cited by 30 publications

(7 citation statements)

References 11 publications

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“…In addition 15 cm of lead served as shielding to suppress background due to gamma radiation. After measurement of the α-particle rate, and subsequent deduction of the apparent boron inventory, the samples were heated in a tantalum furnace, similar to a standard target container [13].…”

Section: Experimental Setup and Measurementmentioning

confidence: 99%

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Radioactive boron beams produced by isotope online mass separation at CERN-ISOLDE

et al. 2019

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We report on the development and characterization of the first radioactive boron beams produced by the isotope mass separation online (ISOL) technique at CERN-ISOLDE. Despite the long history of the ISOL technique which exploits thick targets, boron beams have up to now not been available. This is due to the low volatility of elemental boron and its high chemical reactivity which make the definition of an appropriate production target unit difficult. In addition, the short half-lives of all boron radioisotopes complicate tracer release studies. We report here on dedicated offline release studies by neutron capture and alpha detection done with implanted 10 B in prospective target materials, as well as molecule formation and ionization tests, which suggested the use of multiwalled carbon nanotubes (CNT) as target material and injection of sulfur hexafluoride SF 6 to promote volatile boron fluoride formation. Two target units equipped with an arc discharge electron impact ion source VADIS coupled to a water cooled transfer line to retain non-volatile elements and molecules were subsequently tested online. The measured yield of these first 8 B ISOL beams increases in the series 8 BF3 < 8 BF < 8 B < 8 BF2, reaching a maximum yield of 6.4 × 10 4 8 BF2 + ions per μC of protons.

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Section: Experimental Setup and Measurementmentioning

confidence: 99%

“…Assuming in-target production yields predicted by FLUKA [39], the same efficiency product computes to 0.15%. The availability of this information allows to predict yields of the more exotic boron isotopes 12,13 B, which are given in table 3.…”

Section: Release Efficiencymentioning

confidence: 99%

Radioactive boron beams produced by isotope online mass separation at CERN-ISOLDE

et al. 2019

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“…Two fundamentally different principles of replacing the targets are used at present. At ISOLDE and Oak Ridge the target units sealed by means of a vacuum valve like the one shown in figure 2 are taken care of by means of a preprogrammed industrial robot as shown in figure 7 from (Bjørnstad et al . 1987).…”

Section: (C) Radioactivity Handling and Maximum Driver-beam Intensitiesmentioning

confidence: 99%

Radioactive ion–beam projects based on the two–accelerator or ISOL principle

Ravn

1998

Philosophical Transactions of the Royal Society of London. Seri

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Today, two basically different methods have been developed for production of accelerated radioactive ion beams (RIB). The fragmentation of intense heavy-ion beams, in which the forward momentum imparted to the primary beam fragments is preserved and exploited for mass separation, study and further reactions, is the preferred technique at present. The second method, which is the subject of this review, makes use of spallation, fission and fragmentation reactions in thick targets driven by light particles from a first accelerator or a nuclear reactor. The radioactivity produced is brought to rest in the target and then has to be separated and transformed into an ion beam in order to be post-accelerated in a second machine. This method has in the past 30 years been used successfully at many on-line mass separators to produce low-energy radioactive ion beams. Techniques for the transfer of the nuclear reaction products into an ion beam have been optimized with respect to the individual physical and chemical properties of 70% of the chemical elements. Several new ideas in efficiently matching such an on-line mass separator as injector to a heavy-ion accelerator are currently being developed so that this method holds much promise for the future, in particular when it comes to selecting the intensity and energy choice of the secondary beams. This paper is devoted to a systematic description and discussion of this two-accelerator type of RIB facility, of which many are currently in various phases of construction and planning.

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“…The fluorination tests on the Ln stable isotopes were performed with an off-line mass separator and either a hot plasma MK5 [12] or a surface ionization (SI) [13] the ion source and the quantity of CF 4 injected via a tunable calibrated leak. As a control, we registered the mass spectra obtained in the focal plane of the off-line mass-separator magnet.…”

Section: Off-line Measurementsmentioning

confidence: 99%

Production of lanthanide molecular ion beams by fluorination technique

Roussière¹,

Deloncle²,

Barré-Boscher³

et al. 2016

J. Phys.: Conf. Ser.

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Ionization and dissociation of molecular ion beams caused by ultrashort intense laser pulses I Ben-Itzhak, A M Sayler, P Q Wang et al. Abstract. Systematic off-line fluorination studies on all the stable lanthanide isotopes have been performed. The results are presented as a function of various parameters such as the target temperature, the type of ion source used (hot plasma or surface ionization) and the quantity of CF4 introduced. The first on-line measurements allowed us to determine the optimal experimental conditions for producing radioactive lanthanide isotopes.

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Recent development of high-temperature metal targets for ISOLDE

Cited by 30 publications

References 11 publications

Radioactive boron beams produced by isotope online mass separation at CERN-ISOLDE

Radioactive boron beams produced by isotope online mass separation at CERN-ISOLDE

Radioactive ion–beam projects based on the two–accelerator or ISOL principle

Production of lanthanide molecular ion beams by fluorination technique

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