Isotope shifts and hyperfine structure in the atomic spectrum of platinum

1971 ◽  
Vol 322 (1550) ◽  
pp. 301-311 ◽  
Keyword(s):  
High Resolution ◽  
Nuclear Deformation ◽  
Mean Square ◽  
Specific Mass ◽  
Atomic Spectrum ◽  
Isotope Shifts ◽  
Mass Effects ◽  
Relative Field ◽  
Normal Mass ◽  
The Mean

Two lines in the arc spectrum of platinum have been studied by high resolution interferometry, and results have been obtained for the isotope shifts in both lines. No evidence is found for large specific mass effects and, after allowance for normal mass effects, the results for the two lines give the following relative field isotope shifts: 192-194: 194-196: 196-198 = 0.895 ± 0.009: 0.919 ± 0.004:1 and 194-195: 194-196 = 0.458 ± 0.003; these values are compared with the relative isotope shifts in mercury and thallium. Differences in the mean square radius of the proton distribution for the platinum isotopes are calculated from the field isotope shifts. The contribution of changes in nuclear deformation to the shifts is discussed.

Isotope shifts and hyperfine structure in the optical spectrum of platinum

1974 ◽  
Vol 341 (1626) ◽  
pp. 399-406 ◽  
Keyword(s):  
High Resolution ◽  
Hyperfine Structure ◽  
Optical Spectrum ◽  
Optical Measurements ◽  
Nuclear Deformation ◽  
Digital Recording ◽  
Mean Square ◽  
Isotope Shifts ◽  
Proton Distribution ◽  
Hyperfine Splittings

The lines λ 444.2nm, λ 304.2nm and λ 306.5nm of the arc spectrum of platinum have been studied under high resolution by using digital recording interferometry. The work extends the range of nuclei for which isotope shifts have been measured to include 190 Pt, and has provided some improvement in accuracy for the shifts involving other isotopes. Data are now available for all the stable platinum nuclei; the relative shifts, which are closely proportional to the changes in mean square radius of the proton distribution, are as follows: 190, 192; 0.905 ± 0.028.192, 194; 0.969 ± 0.007. 194, 195; 0.456 ± 0.004. 194, 196; 1.0. 196, 198; 1.084 ± 0.004. The data are discussed in terms of recent measurements of nuclear deformation in platinum. The hyperfine splittings of some levels have also been deduced from the optical measurements.

Isotope shifts and hyperfine structure in the atomic spectrum of palladium

1976 ◽  
Vol 351 (1665) ◽  
pp. 267-275 ◽  
Keyword(s):  
High Resolution ◽  
Hyperfine Structure ◽  
Nuclear Charge ◽  
Digital Recording ◽  
Mean Square ◽  
Atomic Spectrum ◽  
Nuclear Charge Distribution ◽  
Change In The Mean ◽  
The Mean ◽  
First Time

The lines λ340.5 nm, λ357.1 nm, and λ677.4 nm of the arc spectrum of palladium have been studied under high resolution by means of digital recording interferometry. The even-even shifts are claimed to be more accurate than previously published work; the relative shifts determined in λ357.1 nm are 102 Pd - 104 Pd, 1.03(2); 104 Pd - 106 Pd, 1.00; 106 Pd - 108 Pd, 1.02(1); 108 Pd - 110 Pd, 0.92(2); 104 Pd - 105 Pd, 0.23(1). An odd-even shift has been measured for the first time in this element, and shows appreciable staggering. The relative shift 102 Pd - 104 Pd has been found to be substantially greater than the values reported in the literature. Values of the change in the mean square radius of the nuclear charge distribution have been deduced from the measurements, all to an accuracy of Ŧ15% ; these are: 102 Pd - 104 Pd, 0.176 fm 2 ; 104 Pd - 106 Pd, 0.170 fm 2 ; 106 Pd - 108 Pd, 0.173 fm 2 ; 108 Pd - 110 Pd, 0.153 fm 2 .

Evidence for α-particle structure in medium-heavy nuclei from optical isotope shifts

1975 ◽  
Vol 342 (1628) ◽  
pp. 51-54 ◽  
Keyword(s):  
Charge Distribution ◽  
Nuclear Charge ◽  
Heavy Elements ◽  
Mean Square ◽  
Heavy Nuclei ◽  
Particle Structure ◽  
Isotope Shifts ◽  
Nuclear Charge Distribution ◽  
The Mean

It is pointed out that optical isotope shifts between even-even isotopes in the medium-heavy elements show variations which are similar from one element to another, and that these variations are associated with particular values of N – Z , where N and Z refer to neutron and proton numbers respectively. Since the isotope shifts depend on differences in the mean square radii of the nuclear charge distribution, this correlation is evidence for some degree of a-particle structure in these nuclei. Further evidence from the energies of the first excited levels of the nuclei is also briefly considered.

Isotope shifts and hyperfine structure in the atomic spectrum of cadmium

1956 ◽  
Vol 237 (1211) ◽  
pp. 485-495 ◽  
Keyword(s):  
Hyperfine Structure ◽  
Shell Structure ◽  
Neutron Number ◽  
Nuclear Deformation ◽  
Atomic Spectrum ◽  
Isotope Shifts ◽  
Fabry Perot

The isotope shifts in the spark line λ 4416 of cadmium (4 d 10 5 p 2 P 3/2 ─4 d 9 5 8 2 2 D 3/2 ) are accurately measured by means of single and double Fabry─Perot etalons and with the use of electromagnetically enriched isotopes. The shifts between successive even isotopes are found to decrease with increasing neutron number in an irregular manner. Accurate values are obtained for the odd-even and odd-odd shifts in λ 4416; this involved the study of the h. f. s. of the lines λ 3250 and λ 3535. Pronounced odd-even staggering is found. Some conclusions on the change of nuclear deformation with neutron number are drawn and possible connexions with shell structure discussed.

scholarly journals Isotope Shifts in High Lying Levels of Dy I and Er I by High-Resolution UV Laser Spectroscopy

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Wei-Guo Jin ◽  
Hiroaki Ono ◽  
Tatsuya Minowa
Keyword(s):  
High Resolution ◽  
Laser Spectroscopy ◽  
Atomic Beam ◽  
Uv Laser ◽  
Specific Mass ◽  
Isotope Shifts ◽  
Configuration Mixing ◽  
Mass Shifts

High-resolution atomic-beam ultraviolet (UV) laser spectroscopy in Dy I and Er I has been performed. Isotope shifts have been measured for two transitions in Dy I and one transition in Er I. Specific mass shifts and field shifts have been derived for the studied transitions, and large differences between the two – transitions in Dy I have been found. From the derived specific mass shifts and field shifts, configuration mixing at the upper levels of transitions has been discussed.

Isotope shifts in the atomic spectrum of xenon and nuclear deformation effects

1974 ◽  
Vol 270 (2) ◽  
pp. 113-120 ◽  
Author(s):  
W. Fischer ◽  
H. Hühnermann ◽  
G. Krömer ◽  
H. J. Schäfer
Keyword(s):  
Nuclear Deformation ◽  
Atomic Spectrum ◽  
Isotope Shifts

The Bordeaux Automatic Meridian Circle

1978 ◽  
Vol 48 ◽  
pp. 227-228
Author(s):  
Y. Requième
Keyword(s):  
Mean Square Error ◽  
Mean Square ◽  
Meridian Circle ◽  
The Mean ◽  
Full Automation

In spite of important delays in the initial planning, the full automation of the Bordeaux meridian circle is progressing well and will be ready for regular observations by the middle of the next year. It is expected that the mean square error for one observation will be about ±0.”10 in the two coordinates for declinations up to 87°.

The mean-square generalized delayed decision feedback sequence detector

2003 ◽  
Vol 14 (3) ◽  
pp. 265-268 ◽  
Author(s):  
Maurizio Magarini ◽  
Arnaldo Spalvieri ◽  
Guido Tartara
Keyword(s):  
Decision Feedback ◽  
Mean Square ◽  
The Mean

Limit tolerances for sums of measurement errors

2018 ◽  
Vol 934 (4) ◽  
pp. 59-62
Author(s):  
V.I. Salnikov
Keyword(s):  
Normal Distribution ◽  
Mean Square Error ◽  
Gaussian Distribution ◽  
Measurement Errors ◽  
Theory And Practice ◽  
Mean Square ◽  
The Mean ◽  
Limiting Values ◽  
Limiting Value

The question of calculating the limiting values of residuals in geodesic constructions is considered in the case when the limiting value for measurement errors is assumed equal to 3m, ie ∆рred = 3m, where m is the mean square error of the measurement. Larger errors are rejected. At present, the limiting value for the residual is calculated by the formula 3m√n, where n is the number of measurements. The article draws attention to two contradictions between theory and practice arising from the use of this formula. First, the formula is derived from the classical law of the normal Gaussian distribution, and it is applied to the truncated law of the normal distribution. And, secondly, as shown in [1], when ∆рred = 2m, the sums of errors naturally take the value equal to ?pred, after which the number of errors in the sum starts anew. This article establishes its validity for ∆рred = 3m. A table of comparative values of the tolerances valid and recommended for more stringent ones is given. The article gives a graph of applied and recommended tolerances for ∆рred = 3m.

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