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AbstractAbstract
[en] We report on the measurement of optical isotope shifts for 32-40Ar and for 46Ar from which the changes in mean square nuclear charge radii across the N=20 neutron shell closure are deduced. The investigations were carried out by collinear laser spectroscopy in fast beams of neutral argon atoms. The ultra-sensitive detection combines optical pumping, state-selective collisional ionization and counting of β-radioactivity. By reaching far into the sd shell, the results add new information to the systematics of radii in the calcium region (Z ∼20). Contrary to all major neutron shell closures with N ≥28, the N=20 shell closure causes no significant slope change in the development of the radii. Information from the hyperfine structure of the odd-A isotopes includes the magnetic moments of 33Ar (I=1/2) and 39Ar (I=7/2), and the quadrupole moments of 35Ar, 37Ar (I=3/2) and 39Ar. The electromagnetic moments are compared to shell-model predictions for the sd and fp shells. Even far from stability a very good agreement between experiment and theory is found for these quantities. The mean square charge radii are discussed in the framework of spherical SGII Skyrme-type Hartree-Fock calculations. (orig.)
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Journal Article
Literature Type
Numerical Data
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ARGON, ARGON 32, ARGON 33, ARGON 34, ARGON 35, ARGON 36, ARGON 37, ARGON 38, ARGON 39, ARGON 40, ARGON 46, ARGON ISOTOPES, ATOMS, EXPERIMENTAL DATA, HYPERFINE STRUCTURE, ISOTOPE EFFECTS, MAGNETIC DIPOLE MOMENTS, MILLISEC LIVING RADIOISOTOPES, NUCLEAR ELECTRIC MOMENTS, NUCLEAR MAGNETIC MOMENTS, NUCLEAR RADII, QUADRUPOLE MOMENTS, SPECTRAL SHIFT
BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, DATA, DAYS LIVING RADIOISOTOPES, DIPOLE MOMENTS, ELECTRIC MOMENTS, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTS, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOTOPES, LIGHT NUCLEI, MAGNETIC MOMENTS, NONMETALS, NUCLEAR PROPERTIES, NUCLEI, NUMERICAL DATA, RADIOISOTOPES, RARE GASES, SECONDS LIVING RADIOISOTOPES, STABLE ISOTOPES, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
No abstract available
Original Title
Kernradien der Argonisotope 36,38,40Ar aus myonischen Roentgenlinien
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Source
Conferences on nuclear physics - particle physics; Karlsruhe, Germany, F.R; 22 - 27 Mar 1982; Published in summary form only.
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Journal Article
Literature Type
Conference
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; v. 17(6); p. 1145

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AbstractAbstract
[en] Doppler-free optogalvanic measurements of the 667.7 nm 4s[3/2]1 to 4p[1/2]0 transition in sup(36,38,40)Ar have yielded values for the isotope shifts, field shifts and delta< r2>. The field shift, calibrated with muonic X-ray data, confirm a significantly larger delta< r2> for 38-40Ar (0.17 fm2) than for 36-38Ar (0.07 fm2) consistent with similar data for K and Ca crossing the 1fsub(7/2) magic neutron number N=20. (orig.)
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Journal Article
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AbstractAbstract
[en] A large volume, in-core gas irradiation technique was developed at The University of Texas at Austin MARK II TRIGA reactor to produce a sample of 42Ar with an activity above 1 mBq. The method requires a large volume, 1.4 L, of natural Ar gas (99.6003 % 40Ar) at about 1 atm and three 12 h irradiation periods. The production of 42Ar requires a double capture to be produced from the stable 40Ar isotope. This method produced 940 kBq of 39Ar, 3.08 MBq 37Ar, 114 GBq 41Ar, and 0.311 Bq 42Ar at the end of the final irradiation period. (author)
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Source
MARC IX: Methods and applications of radioanalytical chemistry. Part 1; Kona, Hawaii (United States); 25-30 Mar 2012; 10 refs.
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Journal Article
Literature Type
Conference
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 296(1); p. 223-226

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ARGON ISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, DAYS LIVING RADIOISOTOPES, DIMENSIONLESS NUMBERS, ELECTRON CAPTURE RADIOISOTOPES, ELEMENTS, ENRICHED URANIUM REACTORS, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, FLUIDS, GASES, HOMOGENEOUS REACTORS, HOURS LIVING RADIOISOTOPES, HYDRIDE MODERATED REACTORS, INTERMEDIATE MASS NUCLEI, IRRADIATION REACTORS, ISOTOPE PRODUCTION REACTORS, ISOTOPES, LIGHT NUCLEI, NONMETALS, NUCLEI, PULSED REACTORS, RADIOISOTOPES, RARE GASES, REACTORS, RESEARCH AND TEST REACTORS, SOLID HOMOGENEOUS REACTORS, STABLE ISOTOPES, THERMAL REACTORS, TRIGA TYPE REACTORS, WATER COOLED REACTORS, WATER MODERATED REACTORS, YEARS LIVING RADIOISOTOPES, YIELDS
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AbstractAbstract
[en] This is a report on the isotopic composition of argon found in neutron-irradiated quartz ampoules which contain samples of Allende coarse-grained inclusions or aluminium wrap only, and of argon released from one of these inclusions by stepwise heating. Besides atmospheric argon all ampoules contain, with varying concentrations but in constant proportions, 38Ar from Cl and 39Ar from K corresponding to Cl/K approx.= 1. No 39Ar which has recoiled out of the samples and no argon which has diffused out of the samples has been observed in the ampoule gas. The analysis of the isotope variations of argon released by stepwise heating from a sample of inclusion 18 yields an apparent 40Ar-39Ar isochron age of 4.85 AE. A re-analysis of argon from another sample of the same inclusion dated earlier yields the same result. Thus inclusion 18 contains more radiogenic 40Ar than can be accounted for by 40K decay during 4.53 AE. (orig.)
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Source
Record Type
Journal Article
Journal
Earth and Planetary Science Letters; ISSN 0012-821X;
; v. 69(1); p. 1-12

Country of publication
AGE ESTIMATION, ARGON ISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CRYSTAL STRUCTURE, DAYS LIVING RADIOISOTOPES, ELECTRON CAPTURE RADIOISOTOPES, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, INFORMATION, ISOTOPES, LIGHT NUCLEI, MICROSTRUCTURE, NUCLEI, RADIOISOTOPES, SIZE, STABLE ISOTOPES, YEARS LIVING RADIOISOTOPES
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Anderson, J.B.; Malling, G.F.
Pennsylvania State Univ., University Park (USA). Dept. of Chemistry; Union Carbide Corp., Oak Ridge, TN (USA). Nuclear Div1981
Pennsylvania State Univ., University Park (USA). Dept. of Chemistry; Union Carbide Corp., Oak Ridge, TN (USA). Nuclear Div1981
AbstractAbstract
[en] The separation of isotopes in opposed jet flows from slits was examined in Monte Carlo simulations of these flows at several density levels. The basic Monte Carlo method of Bird was employed to determine the flow fields and provide preliminary estimates of separation factors. Separation factors of high accuracy were obtained using a test-particle method in which single particles were followed through the flow fields established by the Bird method. Results were obtained for the system 4He/36Ar, 40Ar, with the argon isotopes seeded at low mole fraction into the helium carrier gas. Species densities, velocities and velocity distributions, as well as separation factors, are reported. For mixtures of 10% Ar in He, the optimum separation effect is observed at inverse Kundsen numbers, based on slit widths, in the range of 10 to 20
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Source
30 Mar 1981; 14 p; 12. international symposium on rarefied gas dynamics; Charlottesville, VA, USA; 7 - 11 Jul 1980; CONF-800715--5; Available from NTIS., PC A02/MF A01
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Report
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Conference
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Kurat, G.; Herrwerth, I.; Jessberger, E.K.; El Goresy, A.; Kirsten, T.; Mueller, N.; Pernicka, E.
Max-Planck-Institut fuer Kernphysik: Annual report 19821983
Max-Planck-Institut fuer Kernphysik: Annual report 19821983
AbstractAbstract
[en] 40Ar-39Ar-dating of individual chrondrules, which were petrographically and chemically characterized, was continued. 40Ar-39Ar-ages range from 4.4 to 4.6 billion years and thus cover a time interval, which cannot be reconciled with current theoretical calculations predicting a comparatively narrow time span needed for the formation of mm-sized particles in the early solar system. Surface-correlated argon is indicated in the younger chondrules which would exclude thermal stress of those chondrules and 40Ar-diffusion-losses as an explanation for their relatively low ages. The higher ages are obtained for structurally and chemically peculiar chondrules. The interference, however, that these ages are due to the admixture of presolar 40Ar from the present data is premature. (orig.)
Original Title
Altersbestimmung einzelner Chondren und ihre petrographische und chemische Charakterisierung
Primary Subject
Source
Max-Planck-Institut fuer Kernphysik, Heidelberg (Germany, F.R.); 221 p; 1983; p. 159-160
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Miscellaneous
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AbstractAbstract
[en] Masses of the short-lived radionuclides Ar32 (T1/2=98 ms) and Ar33 (T1/2=173 ms) have been determined with the Penning trap mass spectrometer ISOLTRAP. Relative uncertainties of 6.0x10-8 (δm=1.8 keV) and 1.4x10-8 (δm=0.44 keV), respectively, have been achieved. At present, these new mass data serve as the most stringent test of the quadratic form of the isobaric-multiplet mass equation. Furthermore, the improved accuracy for the mass of Ar32 will allow for a better constraint on scalar contributions to the weak interaction. New mass values have also been measured for Ar44 and Ar45, and a 20σ deviation for Ar44 from the literature value was found and interpreted
Primary Subject
Source
(c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
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ARGON ISOTOPES, BASIC INTERACTIONS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, INTERACTIONS, INTERMEDIATE MASS NUCLEI, ISOTOPES, LIGHT NUCLEI, MEASURING INSTRUMENTS, MILLISECONDS LIVING RADIOISOTOPES, MINUTES LIVING RADIOISOTOPES, NUCLEI, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, SPECTRA, SPECTROMETERS
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AbstractAbstract
[en] We have measured the isotope shifts between 36,38,40Ar I using Doppler-free intermodulated optogalvanic spectroscopy on the 4p-5d transition at 604.3 nm. A field shift which is 60% greater than that of a 4s-4p transition previously measured was observed. The large relative field shift in the case of an atom of such low Z is surprising and not yet explained by any calculation. (author)
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Journal Article
Literature Type
Numerical Data
Journal
Journal of Physics, B (London). Atomic and Molecular Physics; ISSN 0022-3700;
; CODEN JPAMA; v. 21(16); p. L495-L499

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AbstractAbstract
No abstract available
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Journal Article
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Phys. Lett., B; v. 43(6); p. 473-475
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