1989
DOI: 10.1007/bf01294392
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Nuclear radii of thorium isotopes from laser spectroscopy of stored ions

Abstract: Isotope shifts and hyperfine splittings in optical transitions for atomic ions of the thorium isotopes 227Th to 23~ and 232Th have been measured by laser spectroscopy on stored ions. From the isotope shift data, changes of the mean square charge radii are determined. A continuous increase of the charge radius with mass number A is observed, in agreement with droplet model calculations. The results indicate that the odd-even staggering for Th is different from that one of the neighbouring isotones of Fr and Ra.… Show more

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Cited by 20 publications
(33 citation statements)
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“…The long observation times that are achievable for trapped ions make this technique superior to all other techniques if it comes to the investigation of species that have sufficiently long half-lives but are produced with extremely small rates, as it is the case for some transactinides and superheavy elements that are produced in fusion reactions. In-trap laser spectroscopy and optical-microwave double resonance spectroscopy of ion species that have a complicated level structure and therefore unfavorable excitation schemes has been reported in Paul [101,102] and Penning traps [103] to obtain HFS constants and nuclear g-factors. Buffer-gas cooled ion clouds have been used in these experiments to quench metastable states that would otherwise form dark states and render laser spectroscopy impossible due to the large ARTICLE IN PRESS Fig.…”
Section: Expected Performancementioning
confidence: 99%
“…The long observation times that are achievable for trapped ions make this technique superior to all other techniques if it comes to the investigation of species that have sufficiently long half-lives but are produced with extremely small rates, as it is the case for some transactinides and superheavy elements that are produced in fusion reactions. In-trap laser spectroscopy and optical-microwave double resonance spectroscopy of ion species that have a complicated level structure and therefore unfavorable excitation schemes has been reported in Paul [101,102] and Penning traps [103] to obtain HFS constants and nuclear g-factors. Buffer-gas cooled ion clouds have been used in these experiments to quench metastable states that would otherwise form dark states and render laser spectroscopy impossible due to the large ARTICLE IN PRESS Fig.…”
Section: Expected Performancementioning
confidence: 99%
“…For these measurements, the ions were confined for many hours in an r .f . trap [1][2][3][4][5][6][7] . Laser spectroscopy of stored ions has been shown to be highly sensitive [5], since the ions can be stored for a long time allowing for many photon scattering processes for each trapped ion .…”
mentioning
confidence: 99%
“…[1,2]. Previously, laser excitation of Th + has been reported on a few transitions at lower excitation energy [14,15]. In our experiment, the first excitation step is done on the resonance line at 402 nm wavelength which couples the (6d 2 7s)J =3/2 ground state with the (6d 7s7p)J =5/2 state at 24874 cm −1 .…”
Section: Introductionmentioning
confidence: 99%