2007
DOI: 10.1140/epjst/e2007-00326-1
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(Im-)possible ISOL beams

Abstract: Refractory elements, i.e. elements with very high melting point and low vapor pressure, cannot be released in atomic form from an ISOL target. Therefore most of these elements are presently not available as ISOL beams. However, when reactive gases are introduced into the target, they may form volatile compounds with the refractory elements, allowing for an easier transport to the ion source. Particularly useful are high-temperature stable fluorides and oxides. By these chemical evaporation methods so far ISOL … Show more

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Cited by 25 publications
(19 citation statements)
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“…Gas-catchers are currently employed at the CARIBU experiment at ANL [33], producing beams of Cf fission products that have been reaccelerated for Coulomb-excitation studies. With the thick solid target at ISOLDE however, alternative techniques than direct extraction have to be explored, such as forming volatile gaseous compounds [34]. Recently, the technique of in-trap decay was pioneered at REX-ISOLDE using 61 Mn as a test case to produce a beam of the refractory-like 61 Fe [35].…”
Section: Methodsmentioning
confidence: 99%
“…Gas-catchers are currently employed at the CARIBU experiment at ANL [33], producing beams of Cf fission products that have been reaccelerated for Coulomb-excitation studies. With the thick solid target at ISOLDE however, alternative techniques than direct extraction have to be explored, such as forming volatile gaseous compounds [34]. Recently, the technique of in-trap decay was pioneered at REX-ISOLDE using 61 Mn as a test case to produce a beam of the refractory-like 61 Fe [35].…”
Section: Methodsmentioning
confidence: 99%
“…Refractory elements (e.g., vanadium, zirconium and molybdenum), that have a very high melting point and low vapor pressure, cannot be released from an ISOL target in atomic form. Chemical evaporation techniques and the formation of molecular sidebands are being discussed to overcome this limitation for some refractory elements [253,254]. As the thick-target ISOL technique relies on the diffusion of the wanted atoms out of the target and their effusion into the ion source, decay losses significantly limit the intensity for species with short lifetimes [255][256][257].…”
Section: Isotope Separation On-line (Isol) Techniquesmentioning
confidence: 99%
“…with c m = (j 0,m /π) 2 for fibers (n = 2), and c m = m 2 for spheres (n = 3). j 0,m stands for the m-th positive root of the Bessel function of order zero and τ D is the characteristic diffusion time.…”
Section: Mobility Of Boron In Potential Target Materialsmentioning
confidence: 99%
“…Examples for isotopes with low extractable yields are refractory or chemically very reactive elements such as boron, tungsten or rhenium. The reasons why yields can be very low is apparent from the extraction process itself [2]. After isotope production typically through fission, fragmentation or spallation nuclear reactions, the neutral isotopes have to diffuse to the surface of the target material grain where they can evaporate or react to form more volatile molecules, in the case of a molecular extraction.…”
Section: Introductionmentioning
confidence: 99%