Publications (10)13.36 Total impact
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ABSTRACT: Changes in the mean square nuclear charge radii along the lithium isotopic chain were determined using a combination of precise isotope shift measurements and theoretical atomic structure calculations. Nuclear charge radii of light elements are of high interest due to the appearance of the nuclear halo phenomenon in this region of the nuclear chart. During the past years we have developed a laser spectroscopic approach to determine the charge radii of lithium isotopes which combines high sensitivity, speed, and accuracy to measure the extremely small field shift of an 8mslifetime isotope with production rates on the order of only 10 000 atoms/s. The method was applied to all bound isotopes of lithium including the twoneutron halo isotope 11Li at the online isotope separators at GSI, Darmstadt, Germany, and at TRIUMF, Vancouver, Canada. We describe the laser spectroscopic method in detail, present updated and improved values from theory and experiment, and discuss the results.Physical Review A 01/2011; 83(1). DOI:10.1103/PhysRevA.83.012516 · 2.81 Impact Factor 
Chapter: Nuclear charge radius of 11Li
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ABSTRACT: We have determined the nuclear charge radius of 11Li by highprecision laser spectroscopy. The experiment was performed at the TRIUMFISAC facility where the 7Li11Li isotope shift (IS) was measured in the 2s→3s electronic transition using Dopplerfree twophoton spectroscopy with a relative accuracy better than 10−5. The accuracy for the IS of the other lithium isotopes was also improved. IS’s are mainly caused by differences in nuclear mass, but changes in proton distribution also give small contributions. Comparing experimentally measured IS with advanced atomic calculation of purely massbased shifts, including QED and relativistic effects, allows derivation of the nuclear charge radii. The radii are found to decrease monotonically from 6Li to 9Li, and then increase with 11Li about 11% larger than 9Li. These results are a benchmark for the open question as to whether nuclear core excitation by halo neutrons is necessary to explain the large nuclear matter radius of 11Li; thus, the results are compared with a number of nuclear structure models. Key wordslaser spectroscopynuclear charge radiusisotope shifthalo nucleuslithium04/2010: pages 181188;  [Show abstract] [Hide abstract]
ABSTRACT: A novel method for the determination of nuclear charge radii of lithium isotopes is presented. Precise laser spectroscopic measurements of the isotope shift in the lithium 2s → 3s transition are combined with highly accurate atomic physics calculation of the mass dependent isotope shift to extract the chargedistributionsensitive information. This approach has been used to determine the charge radii of 8,9Li for the first time.08/2006: pages 93100; 
Article: Nuclear charge radius of 11 Li
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ABSTRACT: We have determined the nuclear charge radius of 11Li by highprecision laser spectroscopy. The experiment was performed at the TRIUMFISAC facility where the 7Li11Li isotope shift (IS) was measured in the 2s→3s electronic transition using Dopplerfree twophoton spectroscopy with a relative accuracy better than 10−5. The accuracy for the IS of the other lithium isotopes was also improved. IS’s are mainly caused by differences in nuclear mass, but changes in proton distribution also give small contributions. Comparing experimentally measured IS with advanced atomic calculation of purely massbased shifts, including QED and relativistic effects, allows derivation of the nuclear charge radii. The radii are found to decrease monotonically from 6Li to 9Li, and then increase with 11Li about 11% larger than 9Li. These results are a benchmark for the open question as to whether nuclear core excitation by halo neutrons is necessary to explain the large nuclear matter radius of 11Li; thus, the results are compared with a number of nuclear structure models.Hyperfine Interactions 07/2006; 171(1):181188. DOI:10.1007/s1075100795076 · 0.21 Impact Factor 
Article: Nuclear charge radius of Li11
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ABSTRACT: Sanchez, Rodolfo Noertershaeuser, Wilfried Dax, Andreas Ewald, Guido Goette, Stefan Kirchner, Reinhard Kluge, H. Juergen Kuehl, Thomas Wojtaszek, Agnieszka Bushaw, Bruce A. Drake, Gordon W. F. Yan, ZongChao Zimmermann, Claus Albers, Daniel Behr, John Bricault, Pierre Dilling, Jens Dombsky, Marik Lassen, Jens Levy, C. D. Phil Pearson, Matthew R. Prime, Erika J. Ryjkov, VladimirHyperfine Interactions 01/2006; 171:181188. · 0.21 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We study the charge radii of exotic nuclei through nuclear calculations and isotopicshift evaluations. The computations are performed in the framework of the dynamiccorrelation model DCM for nuclei with an odd number of valence particles and in the boson dynamiccorrelation model (BCDM) for those with an even number of valence particles. These nuclear models take fully into consideration the correlation between valence particles as well as between valence and core particles. Consequently, these computations may reveal feature physics which is associated to the strong correlation between the valence and the core polarized states. Moreover,we propose to analyze the obtained charge radii within the isotopic shift theory in which the electronic transitions for lithium and lithiumlike ions are calculated by considering the three correlated electrons described by a method similar to the nuclear DCM model.Nuclear Physics A 12/2004; 746:587C590C. DOI:10.1016/j.nuclphysa.2004.09.103 · 2.20 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The 2s>3s transition of (6,7,8,9)Li was studied by highresolution laser spectroscopy using twophoton Dopplerfree excitation and resonanceionization detection. Hyperfine structure splittings and isotope shifts were determined with precision at the 100 kHz level. Combined with recent theoretical work, the changes in the nuclearcharge radii of (8,9)Li were determined. These are now the lightest shortlived isotopes for which the charge radii have been measured. It is found that the charge radii monotonically decrease with increasing neutron number from 6Li to 9Li.Physical Review Letters 10/2004; 93(11):113002. DOI:10.1103/PhysRevLett.93.113002 · 7.51 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The 2s>3s transition of Li6,Li7,Li8,Li9 was studied by highresolution laser spectroscopy using twophoton Dopplerfree excitation and resonanceionization detection. Hyperfine structure splittings and isotope shifts were determined with precision at the 100 kHz level. Combined with recent theoretical work, the changes in the nuclearcharge radii of Li8,Li9 were determined. These are now the lightest shortlived isotopes for which the charge radii have been measured. It is found that the charge radii monotonically decrease with increasing neutron number from Li6 to Li9.  [Show abstract] [Hide abstract]
ABSTRACT: Nuclear charge radii of Li6,Li7,Li8,Li9 have recently been measured at the GSI online mass separator using highresolution resonance ionization mass spectroscopy. We give a brief description of the experimental method. The results for the charge radii are compared with different theoretical predictions. 
Article: Nuclear charge radius of Li11
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ABSTRACT: We have determined the nuclear charge radius of Li11 by highprecision laser spectroscopy. The experiment was performed at the TRIUMFISAC facility where the Li7Li11 isotope shift (IS) was measured in the 2s > 3s electronic transition using Dopplerfree twophoton spectroscopy with a relative accuracy better than 10(5). The accuracy for the IS of the other lithium isotopes was also improved. IS's are mainly caused by differences in nuclear mass, but changes in proton distribution also give small contributions. Comparing experimentally measured IS with advanced atomic calculation of purely massbased shifts, including QED and relativistic effects, allows derivation of the nuclear charge radii. The radii are found to decrease monotonically from Li6 to Li9, and then increase with Li11 about 11% larger than Li9. These results are a benchmark for the open question as to whether nuclear core excitation by halo neutrons is necessary to explain the large nuclear matter radius of Li11; thus, the results are compared with a number of nuclear structure models.
Publication Stats
104  Citations  
13.36  Total Impact Points  
Top Journals
Institutions

2011

GSI Helmholtzzentrum für Schwerionenforschung
Darmstadt, Hesse, Germany


2004

Universität Kassel
Cassel, Hesse, Germany
