Methods for Production of Intense Beams of Unstable Nuclei: New Developments at ISOLDE

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

doi:10.1088/0031-8949/34/6a/013

Cited by 54 publications

(14 citation statements)

References 28 publications

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“…The reaction products diffused from the heated target and effused via a low-temperature, water-cooled transfer line to a standard FEBIAD MK-7 plasma ion source [11], where the ionization by plasma discharge took place. The temperature of the transfer line was kept at about 50°C providing efficient condensation of all elements except noble gases and some other gaseous products.…”

Section: A Experimentsmentioning

confidence: 99%

βdecay ofAr47

Weissman

Cederkäll

2004

Phys. Rev. C

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Information on ␤-decay properties of neutron-rich 47 Ar was obtained at the ISOLDE facility at CERN using isobaric selectivity. This was achieved by a combination of a plasma-ion source with a cooled transfer line and subsequent mass separation. A doubly charged beam was used in order to improve the signal-to-background ratio associated with multi-charged noble gas fission products. The identification of the 47 Ar ␥-ray transitions was performed by comparing the spectra obtained from direct proton bombardment of the target and of the neutron converter. New excited levels in the daughter 47 K nucleus corresponding to the negative-parity states were observed. The obtained data are compared to the result of large-scale shell model calculations and quasiparticle random-phase approximation predictions.

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Section: A Experimentsmentioning

confidence: 99%

βdecay ofAr47

Weissman

Cederkäll

2004

Phys. Rev. C

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“…Lutetium isotopes were produced in spallation reactions induced by the 600 MeV proton beam from the Synchro-Cyclotron in a 120 g/cm 2 target of stacked rolls of tantalum foils [11]. The target which is heated at about 2000 0 C releases neutron-deficient isotopes of nearly all rareearth elements including lutetium which is produced according to 181 Ta (p, 3pxn) 179 x Lu.…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

“…Since fluorescence occurs predominantly at the same wavelength, the photon collection optics was used without any blocking filters, thus being sensitive to stray laser light and some background due to collisional excitation of the atoms. This latter background is not only due to lutetium, but mostly to the isobars of the neighbouring rare-earth elements which are present in the beams [11]. It was kept at a tolerable level in the range of 10 100 kHz depending on the isobar mass by running the charge exchange cell at a relatively low sodium vapour pressure and by using a blue-sensitive photo multiplier.…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

Laser spectroscopy investigation of the nuclear moments and radii of lutetium isotopes

Georg

Borchers

Keim

et al. 1998

EPJ A

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Collinear laser spectroscopy experiments in the LuI transition 5d6s were performed on all lutetium isotopes in the range of 161 179 Lu. The nuclear spins, magnetic moments and quadrupole moments were determined from the hyperfine structures observed for 19 ground states and 11 isomers. Variations in the mean square charge radii as a function of neutron number were obtained from the isotope shifts. These data considerably extend the systematics of the properties of nuclei in the upper rare-earth region. A particular feature is the appearance of high-spin and low-spin ground states and isomeric states in the vicinity of the stable 175 Lu, partly arising from aligned neutron pairs. The present results clearly show that the deformation properties are nearly independent of the occupancy and the coupling of single-particle states. Theoretical predictions of deformation are confirmed in a consistent description of the measured radii and quadrupole moments. For all observed states, the spins and magnetic moments allow the assignment of rather pure Nilsson configurations.

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“…However, the combination with a water-cooled transfer line between target and ion source adds the necessary element selectivity by condensing and depositing all less volatile reaction products. This rather simple targetion-source system is ideal for production of pure radioactive beams of noblegas elements with high ionisation efficiencies [21]. The high fission yields of Kr and Xe isotopes, their high ionisation efficiency and isobaric selectivity, together with the simple operation of this type of plasma ion source has made these pure noble-gas radioactive beams very attractive for use in various target tests.…”

Section: Introductionmentioning

confidence: 99%