Study of the average charge states of 188Pb and 252,254No ions at the gas-filled separator TASCA

J. Khuyagbaatar; D. Ackermann; L. L. Andersson; J. Ballof; W. Brüchle; Ch E. Düllmann; J. Dvorak; K. Eberhardt; J. Even; A. Gorshkov; R. Graeger; F. P. Heßberger; D. Hild; R. Hoischen; E. Jäger; B. Kindler; J. V. Kratz; S. Lahiri; B. Lommel; M. Maiti; E. Merchan; D. Rudolph; M. Schädel; H. Schaffner; B. Schausten; E. Schimpf; A. Semchenkov; A. Serov; A. Türler; A. Yakushev

doi:10.1016/j.nima.2012.06.007

Study of the average charge states of ¹⁸⁸Pb and ^252,254No ions at the gas-filled separator TASCA

J. Khuyagbaatar, D. Ackermann, L. L. Andersson, J. Ballof, W. Brüchle, Ch E. Düllmann, J. Dvorak, K. Eberhardt, J. Even, A. Gorshkov, R. Graeger, F. P. Heßberger, D. Hild, R. Hoischen, E. Jäger, B. Kindler, J. V. Kratz, S. Lahiri, B. Lommel, M. MaitiE. Merchan, D. Rudolph, M. Schädel, H. Schaffner, B. Schausten, E. Schimpf, A. Semchenkov, A. Serov, A. Türler, A. Yakushev

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The average charge states of ¹⁸⁸Pb and ^252,254No ions in dilute helium gas were measured at the gas-filled recoil separator TASCA. Hydrogen gas was also used as a filling gas for measurements of the average charge state of ²⁵⁴No. Helium and hydrogen gases at pressures from 0.2 mbar to 2.0 mbar were used. A strong dependence of the average charge state on the pressure of the filling gases was observed for both, helium and hydrogen. The influence of this dependence, classically attributed to the so-called density effect, on the performance of TASCA was investigated. The average charge states of ²⁵⁴No ions were also measured in mixtures of helium and hydrogen gases at low gas pressures around 1.0 mbar. From the experimental results simple expressions for the prediction of average charge states of heavy ions moving in rarefied helium gas, hydrogen gas, and in their mixture were derived.

Original language	English
Pages (from-to)	40-46
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	689
DOIs	https://doi.org/10.1016/j.nima.2012.06.007
State	Published - Oct 11 2012
Externally published	Yes

Funding

We thank the ECR ion source and UNILAC staff for providing 48 Ca beams with high and stable intensity. We are grateful to `J. Steiner, W. Hartmann, and A. Hübner for production of the target materials and preparation of the target wheels. We thank K.E. Gregorich for providing us with the TSIM code. These studies were financially supported the GSI F&E program and by the Research Center “Elementary Forces and Mathematical Foundations” (EMG) at Mainz University.

Funders	Funder number
Mainz University
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	144511

Keywords

Average charge state
Gas-filled separator
Heavy ion
TASCA

Access to Document

10.1016/j.nima.2012.06.007

Cite this

Khuyagbaatar, J., Ackermann, D., Andersson, L. L., Ballof, J., Brüchle, W., Düllmann, C. E., Dvorak, J., Eberhardt, K., Even, J., Gorshkov, A., Graeger, R., Heßberger, F. P., Hild, D., Hoischen, R., Jäger, E., Kindler, B., Kratz, J. V., Lahiri, S., Lommel, B., ... Yakushev, A. (2012). Study of the average charge states of ¹⁸⁸Pb and ^252,254No ions at the gas-filled separator TASCA. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 689, 40-46. https://doi.org/10.1016/j.nima.2012.06.007

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title = "Study of the average charge states of 188Pb and 252,254No ions at the gas-filled separator TASCA",

abstract = "The average charge states of 188Pb and 252,254No ions in dilute helium gas were measured at the gas-filled recoil separator TASCA. Hydrogen gas was also used as a filling gas for measurements of the average charge state of 254No. Helium and hydrogen gases at pressures from 0.2 mbar to 2.0 mbar were used. A strong dependence of the average charge state on the pressure of the filling gases was observed for both, helium and hydrogen. The influence of this dependence, classically attributed to the so-called density effect, on the performance of TASCA was investigated. The average charge states of 254No ions were also measured in mixtures of helium and hydrogen gases at low gas pressures around 1.0 mbar. From the experimental results simple expressions for the prediction of average charge states of heavy ions moving in rarefied helium gas, hydrogen gas, and in their mixture were derived.",

keywords = "Average charge state, Gas-filled separator, Heavy ion, TASCA",

author = "J. Khuyagbaatar and D. Ackermann and Andersson, {L. L.} and J. Ballof and W. Br{\"u}chle and D{\"u}llmann, {Ch E.} and J. Dvorak and K. Eberhardt and J. Even and A. Gorshkov and R. Graeger and He{\ss}berger, {F. P.} and D. Hild and R. Hoischen and E. J{\"a}ger and B. Kindler and Kratz, {J. V.} and S. Lahiri and B. Lommel and M. Maiti and E. Merchan and D. Rudolph and M. Sch{\"a}del and H. Schaffner and B. Schausten and E. Schimpf and A. Semchenkov and A. Serov and A. T{\"u}rler and A. Yakushev",

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Khuyagbaatar, J, Ackermann, D, Andersson, LL, Ballof, J, Brüchle, W, Düllmann, CE, Dvorak, J, Eberhardt, K, Even, J, Gorshkov, A, Graeger, R, Heßberger, FP, Hild, D, Hoischen, R, Jäger, E, Kindler, B, Kratz, JV, Lahiri, S, Lommel, B, Maiti, M, Merchan, E, Rudolph, D, Schädel, M, Schaffner, H, Schausten, B, Schimpf, E, Semchenkov, A, Serov, A, Türler, A & Yakushev, A 2012, 'Study of the average charge states of ¹⁸⁸Pb and ^252,254No ions at the gas-filled separator TASCA', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 689, pp. 40-46. https://doi.org/10.1016/j.nima.2012.06.007

Study of the average charge states of ¹⁸⁸Pb and ^252,254No ions at the gas-filled separator TASCA. / Khuyagbaatar, J.; Ackermann, D.; Andersson, L. L. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 689, 11.10.2012, p. 40-46.

Research output: Contribution to journal › Article › peer-review

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T1 - Study of the average charge states of 188Pb and 252,254No ions at the gas-filled separator TASCA

AU - Khuyagbaatar, J.

AU - Ackermann, D.

AU - Andersson, L. L.

AU - Ballof, J.

AU - Brüchle, W.

AU - Düllmann, Ch E.

AU - Dvorak, J.

AU - Eberhardt, K.

AU - Even, J.

AU - Gorshkov, A.

AU - Graeger, R.

AU - Heßberger, F. P.

AU - Hild, D.

AU - Hoischen, R.

AU - Jäger, E.

AU - Kindler, B.

AU - Kratz, J. V.

AU - Lahiri, S.

AU - Lommel, B.

AU - Maiti, M.

AU - Merchan, E.

AU - Rudolph, D.

AU - Schädel, M.

AU - Schaffner, H.

AU - Schausten, B.

AU - Schimpf, E.

AU - Semchenkov, A.

AU - Serov, A.

AU - Türler, A.

AU - Yakushev, A.

PY - 2012/10/11

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N2 - The average charge states of 188Pb and 252,254No ions in dilute helium gas were measured at the gas-filled recoil separator TASCA. Hydrogen gas was also used as a filling gas for measurements of the average charge state of 254No. Helium and hydrogen gases at pressures from 0.2 mbar to 2.0 mbar were used. A strong dependence of the average charge state on the pressure of the filling gases was observed for both, helium and hydrogen. The influence of this dependence, classically attributed to the so-called density effect, on the performance of TASCA was investigated. The average charge states of 254No ions were also measured in mixtures of helium and hydrogen gases at low gas pressures around 1.0 mbar. From the experimental results simple expressions for the prediction of average charge states of heavy ions moving in rarefied helium gas, hydrogen gas, and in their mixture were derived.

AB - The average charge states of 188Pb and 252,254No ions in dilute helium gas were measured at the gas-filled recoil separator TASCA. Hydrogen gas was also used as a filling gas for measurements of the average charge state of 254No. Helium and hydrogen gases at pressures from 0.2 mbar to 2.0 mbar were used. A strong dependence of the average charge state on the pressure of the filling gases was observed for both, helium and hydrogen. The influence of this dependence, classically attributed to the so-called density effect, on the performance of TASCA was investigated. The average charge states of 254No ions were also measured in mixtures of helium and hydrogen gases at low gas pressures around 1.0 mbar. From the experimental results simple expressions for the prediction of average charge states of heavy ions moving in rarefied helium gas, hydrogen gas, and in their mixture were derived.

KW - Average charge state

KW - Gas-filled separator

KW - Heavy ion

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