Low- internal target from a cryogenically cooled liquid microjet source

Kühnel, Matthias; Petridis, N.; Winters, D.; Popp, U.; Dørner, R.; Stöhlker, Th.; Grisenti, R. E.

doi:10.1016/j.nima.2008.12.212

Cited by 63 publications

(35 citation statements)

References 16 publications

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“…This target consisted of a helium gas-jet, perpendicular to the beam direction, with a diameter of about 7 mm at the interaction zone with the cooled beam (σ value of less than 1 mm). This system was operated with a cryogenically cooled gas-source (∼20 K) in order to improve the density of the gas target [18]. An average target FIG.…”

Section: Methodsmentioning

confidence: 99%

Nuclear-matter radius studies fromNi58(α,α)experiments at the GSI Experimental Storage Ring with the EXL facility

Zamora¹,

Aumann²,

Bagchi³

et al. 2017

Phys. Rev. C

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A novel method for measuring nuclear reactions in inverse kinematics with stored ion beams was successfully used to extract the nuclear-matter radius of 58 Ni. The experiment was performed at the experimental heavy-ion storage ring at the GSI facility using a stored 58 Ni beam at energies of 100 and 150 MeV/u and an internal helium gas-jet target. Elastically scattered α-recoils at low momentum transfers were measured with an in-ring detector system compatible with ultrahigh vacuum. Experimental angular distributions were fitted using density-dependent optical model potentials within the eikonal approximation. This permitted the extraction of the point-matter root-mean-square radius of 58 Ni with an average value of 3.70(7) fm. Results from this work are in good agreement with several experiments performed in the past in normal kinematics. This pioneering experiment demonstrates a major breakthrough towards future investigations with far-from-stability stored beams using the present technique.

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Section: Methodsmentioning

confidence: 99%

Nuclear-matter radius studies fromNi58(α,α)experiments at the GSI Experimental Storage Ring with the EXL facility

Zamora¹,

Aumann²,

Bagchi³

et al. 2017

Phys. Rev. C

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“…This value, which corresponds to a diameter of the gas jet of 5 mm at the intersection point with the ion beam, was determined by the skimmer geometry of the target apparatus and was also verified experimentally, see [41,42]. However, recent investigations indicate that the upgrade of the target apparatus a few years ago [43] gave rise to a slight modification of the target profile. More specific, a recent spatial characterization of the target shape, that was performed by members of the FOCAL collaboration [44], yielded a flat-top target profile with a mean diameter of Δx ¼ 6.4 mm and slightly fuzzy edges [45,46] at the interaction point with the ion beam.…”

Section: Measurement Technique and Data Analysismentioning

confidence: 61%

“…Along its passage through the interaction chamber only a minor fraction of the particles within the gas jet is evaporated or kicked out in hard collisions with the projectile beam, resulting in a nearly 100% collection efficiency of the gas load within the dump section of the target installation. For a detailed description of the internal gas target at the ESR the reader is referred to [41][42][43]. However, one has to note that in Eq.…”

Section: Measurement Technique and Data Analysismentioning

confidence: 99%

Total projectile electron loss cross sections ofU28+ions in collisions with gaseous targets ranging from hydrogen to krypton

Weber

Herdrich

DuBois

et al. 2015

Phys. Rev. ST Accel. Beams

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Beam lifetimes of stored U 28þ ions with kinetic energies of 30 and 50 MeV=u, respectively, were measured in the experimental storage ring of the GSI accelerator facility. By using the internal gas target station of the experimental storage ring, it was possible to obtain total projectile electron loss cross sections for collisions with several gaseous targets ranging from hydrogen to krypton from the beam lifetime data. The resulting experimental cross sections are compared to predictions by two theoretical approaches, namely the CTMC method and a combination of the DEPOSIT code and the RICODE program.

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“…However, it has been shown that a proton-induced reaction can be investigated in this kinematics [9]. The revolving ions were penetrating a hydrogen jet target [10], which has most likely a much bigger impact on the vacuum conditions than the walls. The neutrons can easily penetrate the beam pipe creating a kind of neutron gas, which the revolving ions have to pass.…”

Section: Conceptmentioning

confidence: 99%