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Featured researches published by A. Dretzke.


Hyperfine Interactions | 2000

The SHIPTRAP project: A capture and storage facility at GSI for heavy radionuclides from SHIP

J. Dilling; D. Ackermann; J. Bernard; F.P. Hessberger; S. Hofmann; W. Hornung; H.-J. Kluge; E. Lamour; M. Maier; R. Mann; Gerrit Marx; R.B. Moore; G. Münzenberg; W. Quint; D. Rodriguez; M. Schädel; J. Schönfelder; G. Sikler; C. Toader; L. Vermeeren; C. Weber; G. Bollen; O. Engels; D. Habs; P. G. Thirolf; H. Backe; A. Dretzke; W. Lauth; W. Ludolphs; M. Sewtz

SHIPTRAP is an ion trap facility which is being set up to deliver very clean and cool beams of singly-charged recoil ions produced at the SHIP velocity filter at GSI Darmstadt. SHIPTRAP consists of a gas cell for stopping and thermalizing high-energy recoil ions from SHIP, a rf ion guide for extraction of the ions from the gas cell, a linear rf trap for accumulation and bunching of the ions, and a Penning trap for isobaric purification. The physics programme of the SHIPTRAP facility comprises mass spectrometry, nuclear spectroscopy, laser spectroscopy and chemistry of transeinsteinium elements.


Spectrochimica Acta Part B: Atomic Spectroscopy | 2003

Resonance ionization spectroscopy of fermium (Z=100)☆☆☆

M. Sewtz; H. Backe; C.Z. Dong; A. Dretzke; K. Eberhardt; S. Fritzsche; C. Grüning; Richard G. Haire; G. Kube; Peter Kunz; Jens Lassen; W. Lauth; G. Passler; P. Schwamb; P. Thörle; N. Trautmann

Laser spectroscopy has been applied for the first time to measure resonant transition frequencies of fermium (Zs 100). A number of 2.7=10 atoms was electrodeposited on a Ta filament and covered with a 1 mm Ti layer. Fm 10


Hyperfine Interactions | 2000

Isotope shift measurement at 244fAm

H. Backe; A. Dretzke; M. Hies; G. Kube; H. Kunz; W. Lauth; M. Sewtz; N. Trautmann; R. Repnow; H.J. Maier

AbstractOptical isotope shift measurements have been performed at the 244fAm fission isomers (T1/2=1 ms) with low target production rates of 10/s employing resonance ionization spectroscopy in a buffer gas cell. The isotope shift ratio IS244f,241/IS243,241 = 42.0(9) has been measured at the 500.02 nm transition. A change in the nuclear mean charge radius


Journal of Nuclear Science and Technology | 2002

First Determination of the Ionization Potential of Actinium and First Observation of Optical Transitions in Ferminm

H. Backe; A. Dretzke; K. Eberhardt; S. Fritzsche; C. Grüning; G. Gwinner; Richard G. Haire; G. Huber; Jens Volker Kratz; G. Kube; Peter Kunz; Jens Lassen; W. Lauth; G. Passler; R. Repnow; D. Schwalm; Peter Schwamb; M. Sewtz; Petra Thörle; N. Trautmann; A. Waldek


Hyperfine Interactions | 2001

Status of the SHIPTRAP Project: A Capture and Storage Facility for Heavy Radionuclides from SHIP

Gerrit Marx; D. Ackermann; J. Dilling; F.P. Hessberger; S. Hoffmann; H.-J. Kluge; R. Mann; G. Münzenberg; Z. Qamhieh; W. Quint; D. Rodriguez; M. Schädel; J. Schönfelder; G. Sikler; C. Toader; C. Weber; O. Engels; D. Habs; P. G. Thirolf; H. Backe; A. Dretzke; W. Lauth; W. Ludolphs; M. Sewtz

\delta \langle r^2 \rangle _{{\text{opt}}}^{{\text{224}}f,241}


Physical Review Letters | 2003

First observation of atomic levels for the element fermium (Z=100).

M. Sewtz; H. Backe; A. Dretzke; G. Kube; W. Lauth; P. Schwamb; K. Eberhardt; C. Grüning; P. Thörle; N. Trautmann; Peter Kunz; Jens Lassen; G. Passler; C.Z. Dong; S. Fritzsche; Richard G. Haire


European Physical Journal D | 2007

Towards optical spectroscopy of the element nobelium (\({\sf Z }= \mathsf{102}\)) in a buffer gas cell

H. Backe; P. Kunz; W. Lauth; A. Dretzke; R. Horn; T. Kolb; M. Laatiaoui; M. Sewtz; D. Ackermann; M. Block; F. Herfurth; F. P. Heßberger; S. Hofmann; Robert B. Mann

= 5.41(31) fm2 and an intrinsic quadrupole moment


Hyperfine Interactions | 2006

Laser Spectroscopic Investigation of the Element Fermium (Z = 100)

H. Backe; A. Dretzke; St. Fritzsche; Richard G. Haire; P. Kunz; W. Lauth; M. Sewtz; N. Trautmann


European Physical Journal D | 2007

Towards optical spectroscopy of the element nobelium (Z = 102) in a buffer gas cell

H. Backe; P. Kunz; W. Lauth; A. Dretzke; Roger Horn; Torsten Kolb; M. Laatiaoui; Michael Sewtz; D. Ackermann; Michael Block; F. Herfurth; F. P. Hessberger; Alexander Hofmann; Robert B. Mann

Q_{{\text{20}}}^{{\text{224}}f}


Hyperfine Interactions | 2006

Ion Mobility Measurements and Ion Chemical Reaction Studies at Heavy Elements in a Buffer Gas Cell

H. Backe; A. Dretzke; R. Horn; T. Kolb; W. Lauth; R. Repnow; M. Sewtz; N. Trautmann

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Richard G. Haire

Oak Ridge National Laboratory

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Gerrit Marx

Goethe University Frankfurt

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