High-resolution measurements of isotope shifts and hyperfine structure in stable and radioactive lead isotopes

Thompson, R. C.; Anselment, M.; Bekk, K.; Göring, S.; Hanser, Α.; Meisel, G.; Rebel, H.; Schatz, G.; Brown, Beth

doi:10.1088/0305-4616/9/4/010

Cited by 94 publications

(37 citation statements)

References 21 publications

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“…The S 2n values derived from the experimental results between N = 114 and N = 126 including our work for the neutron-deficient Rn isotopes follow this trend nicely. This indicates that the deformation of the radon nuclei with four additional protons compared to Pb, with the magic proton number Z = 82, is comparable to those of the Pb isotopes [36], which confirms the results of previous investigations [37].…”

Section: Two-neutron Separation Energiessupporting

confidence: 89%

High-precision mass measurements of 203-207Rn and 213Ra with SHIPTRAP

et al. 2013

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General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal 205 Rn and 213 Ra were significantly reduced. The results are relevant for the investigation of the nuclear shell structure between N = 82 and N = 126. As an indicator of structural changes the two-neutron separation energies S 2n (Z, N) have been studied.

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Section: Two-neutron Separation Energiessupporting

confidence: 89%

High-precision mass measurements of 203-207Rn and 213Ra with SHIPTRAP

et al. 2013

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“…The hfs A values are adopted from Bouazza et al (2000) for all lines. The IS are adopted from Bouazza et al for the λλ3639, 3683, and 4057 lines and Thompson et al (1983) for the λ2833 line. The standard index of air is given in Peck & Reeder (1972).…”

Section: Appendix C New Hfs Patterns For Neutral Leadmentioning

confidence: 99%

NEW HUBBLE SPACE TELESCOPE OBSERVATIONS OF HEAVY ELEMENTS IN FOUR METAL-POOR STARS

Roederer

Lawler

Sobeck

et al. 2012

ApJS

136

127

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Elements heavier than the iron group are found in nearly all halo stars. A substantial number of these elements, key to understanding neutron-capture nucleosynthesis mechanisms, can only be detected in the near-ultraviolet. We report the results of an observing campaign using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope to study the detailed heavy-element abundance patterns in four metal-poor stars. We derive abundances or upper limits from 27 absorption lines of 15 elements produced by neutron-capture reactions, including seven elements (germanium, cadmium, tellurium, lutetium, osmium, platinum, and gold) that can only be detected in the near-ultraviolet. We also examine 202 heavy-element absorption lines in ground-based optical spectra obtained with the Magellan Inamori Kyocera Echelle Spectrograph on the Magellan-Clay Telescope at Las Campanas Observatory and the High Resolution Echelle Spectrometer on the Keck I Telescope on Mauna Kea. We have detected up to 34 elements heavier than zinc. The bulk of the heavy elements in these four stars are produced by r-process nucleosynthesis. These observations affirm earlier results suggesting that the tellurium found in metal-poor halo stars with moderate amounts of r-process material scales with the rare earth and third r-process peak elements. Cadmium often follows the abundances of the neighboring elements palladium and silver. We identify several sources of systematic uncertainty that must be considered when comparing these abundances with theoretical predictions. We also present new isotope shift and hyperfine structure component patterns for Lu ii and Pb i lines of astrophysical interest.

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“…free tin atoms, obtained by vacuum evaporation of elementary tin samples, are irradiated with resonant Iaser light to excite them (see Fig. 1 The experimental setup has been described elsewhere, 17 we therefore restriet the description mainly to special features and alterations that were introduced for the tin experiments.…”

Section: Experimental Arrr·angementmentioning

confidence: 99%

Charge radii and moments of tin nuclei by laser spectroscopy

Anselment¹,

Bekk²,

Hanser³

et al. 1986

Phys. Rev. C

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The isotope shift and hyperfine structure of the optical Sn resonance transition 5p 2 3 p 0 -+ 5p6s 3 P 1 at >..=286.3nm have been studied for 18 Sn nuclei including 2 isomers. Laser induced resonance fluorescence from a collimated atomic beam of tin was observed using a tunable cw dye Iaser .with frequency doubler. The electromagnetic nuclear moments and changes of the mean square charge radii of the nuclear charge distributions were determined. The results are discussed with respect to the information they provide on the nuclear structure of the nuclei investigated; they are compared with various theoretical models. DIE LASERSPEKTROSKOPISCHE BESTIMMUNG DER KERN-LADUNGS-RADIEN UND -MOMENTE VON ZINN-ATOMKERNEN I. I ntroductionThe energies of atomic transitions, in particular those associated with s electrons, alter slightly with the neutron number of the atomic nucleus. This isotope shift arises from the difference of the nuclear masses of the isotopes and from the difference of the nuclear Coulomb field experienced by the atomic electrons involved in the transition. The latter contribution, historically referred to as volume effect, 1 is due to isotopic differences of the nuclear charge distributions of which the mean square eh arge radius enters into the volume effect calculation.Effects of nuclear polarization associated with the interaction between atomic and nuclear states also give rise to isotope shifts, but this contribution is expected to be so small that it can be ignored for transitions of normal atoms. 2 In addition, the interaction of the nuclear magnetism and of nonspherical components of the nuclear charge distribution with the atomic electrons Iead to the weil known hyperfine splitting of atomic lines.Studies of these nuclear effects observed in atomic transitions are an important source of nuclear structure information, in particular about the systematics of nuclear charge radii and electromagnetic moments in long isotopic series. The renewed interest and may shed some light on pairing interactions. 13The present paper reports on Iaser spectroscopic measurements of the isotope shift and the hyperfine splitting in the 5p 2 3 P 0 -+ 5p6s 3 P 1 The experimental setup has been described elsewhere, 17we therefore restriet the description mainly to special features and alterations that were introduced for the tin experiments.The evaporation of the tin samples required temperatures of about 2100· K which are much higher than those used previously in the apparatus. This temperature is considerably higher than that one required for evaporation of bulk tin. The reason possibly is that the samples are so small that the tin atoms are spread over the crucible in low concentration which seems to bind them more strongly to its surface. Therefore a new heater of the electron bombardment type was developed. The anode is a vertically mounted tube made of high purity graphite. The crucibles are made of spectroscopically pure graphite so that practically no tin was detected with an empty crucible h...

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High-resolution measurements of isotope shifts and hyperfine structure in stable and radioactive lead isotopes

Cited by 94 publications

References 21 publications

High-precision mass measurements of 203-207Rn and 213Ra with SHIPTRAP

High-precision mass measurements of 203-207Rn and 213Ra with SHIPTRAP

NEW HUBBLE SPACE TELESCOPE OBSERVATIONS OF HEAVY ELEMENTS IN FOUR METAL-POOR STARS

Charge radii and moments of tin nuclei by laser spectroscopy

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