Preparation of self-supporting carbon thin films

Lommel, B.; Hartmann, W.; Kindler, B.; Klemm, J.; Steiner, J.

doi:10.1016/s0168-9002(01)02100-3

Cited by 37 publications

(17 citation statements)

References 9 publications

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“…This was possible due to the marked difference in hyperfine structures of the different 184 Tl isomers. After separation, the ion beam entered the Windmill system [17][18][19] through a collimator and was then implanted in one out of the ten carbon foils (6 mm diameter, 20 μg/cm 2 thickness [22]) that were mounted on a rotating wheel. After each supercycle the wheel was rotated to move away the radioactivity from the implantation position and present a fresh foil in front of the ion beam.…”

Section: Methodsmentioning

confidence: 99%

Internal decay of the(10−)intruder state inTl184

et al. 2015

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Decay spectroscopy of 184 Tl has been performed at the CERN Isotope Separator On-Line (ISOLDE) facility. An excitation energy of 506.1(1) keV and a half-life of 47.1(7) ms of the intruder based (10 − ) state have been extracted. The internal decay characteristics of this state are determined and discussed, extending the systematics of such states in the even-mass thallium nuclei below neutron midshell at N = 104. The retardation factors of the isomeric M2 and E3 transitions are deduced and compared with retardation factors in neighboring odd-mass and even-mass thallium isotopes. The new information is combined with a review of hindered and unhindered α-decay data of [187][188][189][190][191][192] Bi populating levels in daughter nuclei [183][184][185][186][187][188] Tl and supports the interpretation of the intruder character of the (10 − ) state in 184 Tl.

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Section: Methodsmentioning

confidence: 99%

Internal decay of the(10−)intruder state inTl184

et al. 2015

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“…[36] and references therein). The wheel holds nine carbon foils, produced at the GSI target laboratory [37], with a thickness of 20ð1Þ μg cm −2 (approximately 90 nm) into which the ion beam is implanted (at a depth of approximately 25 nm).…”

Section: B Decay-assisted Laser Spectroscopymentioning

confidence: 99%

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

et al. 2014

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This paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes [202][203][204][205][206] Fr performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay-spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes [202][203][204][205][206] Fr, in addition to the identification of the low-lying states of 202;204 Fr performed at the CRIS experiment.

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“…2 shows photographs of thin selfsupporting carbon foils being irradiated by 1.4 MeV=u U 4þ beams at electrical beam currents of about 5-6 emA for typically four hours (100 μs, 2 Hz beam pulses) while the focal spot rms radius ≈5 mm. Mainly ≈20 μg=cm 2 thick amorphous carbon foils produced at the GSI target laboratory [34,35] as well as those provided by Isao Sugai from KEK, were used [30][31][32]. Some thicker foils of 30-50 μg=cm 2 were also considered.…”

Section: Experimental Results Of Recent Foil-stripper Operation Amentioning

confidence: 99%

Three-dimensional thermal simulations of thin solid carbon foils for charge stripping of high current uranium ion beams at a proposed new heavy-ion linac at GSI

Tahir

Kim

Sick

et al. 2014

Phys. Rev. ST Accel. Beams

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This paper presents an extensive numerical study of heating of thin solid carbon foils by 1.4 MeV=u uranium ion beams to explore the possibility of using such a target as a charge stripper at the proposed new Gesellschaft für Schwerionenforschung high energy heavy-ion linac. These simulations have been carried out using a sophisticated 3D computer code that accounts for physical phenomena that are important in this problem. A variety of beam and target parameters have been considered. The results suggest that within the considered parameter range, the target will be severely damaged by the beam. Thus, a carbon foil stripper does not seem to be a reliable option for the future Gesellschaft für Schwerionenforschung high energy heavy-ion linac, in particular, at FAIR design beam intensities.

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Preparation of self-supporting carbon thin films

Cited by 37 publications

References 9 publications

Internal decay of the(10−)intruder state inTl184

Internal decay of the(10−)intruder state inTl184

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

Three-dimensional thermal simulations of thin solid carbon foils for charge stripping of high current uranium ion beams at a proposed new heavy-ion linac at GSI

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