A method of determining the relative importance of particular data on selected parameters in the least-squares analysis of experimental data

Audi, G.; Davies, W.G.; Lee-Whiting, G.E.

doi:10.1016/0168-9002(86)90700-x

Cited by 25 publications

(19 citation statements)

References 2 publications

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“…In addition, the sum of in uences IF brought by the Penning trap data is given in column 6. This value is the percentage of the contribution of these data [35] to the determination of the mass values in the adjustment. From Table 5 it can be seen that in 18 cases of the 41 measured masses the in uence of the ISOLTRAP data is greater than 50%, increasing to 21 cases when the not yet adjusted masses of the three light oddbarium isotopes are taken into account.…”

Section: Comparison Of Isoltrap Data With Adjusted Resultsmentioning

confidence: 99%

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High-accuracy mass determination of unstable cesium and barium isotopes

et al. 1999

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Direct mass measurements of short-lived Cs and Ba isotopes have been performed with the tandem Penning trap mass spectrometer ISOLTRAP installed at the online isotope separator ISOLDE at CERN. Typically, a mass resolving power of 600 000 and an accuracy of m 13 keV have been obtained. The masses of 123;124;126 Ba and 122m Cs were measured for the rst time. A least-squares adjustment has been performed and the experimental masses are compared with theoretical ones, particularly in the frame of a macroscopic-microscopic model.

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Section: Comparison Of Isoltrap Data With Adjusted Resultsmentioning

confidence: 99%

“…In column 4 the relative deviations v=sbetween measured and adjusted values are given as their di erences v divided by the uncertainty s of the experimental value. The last column gives the signi cance S [35] of the present data in the new adjustment. The "Partial Consistency Factor" [61] of this set of data is 0.95.…”

Section: T I M E [ S ]mentioning

confidence: 99%

High-accuracy mass determination of unstable cesium and barium isotopes

et al. 1999

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“…In the following, all investigated nuclides are discussed in turn. The influences of the contributing data to the final mass-excess value, which results from the flow-of-information matrix [35], is given as a percentage. In general these values are rounded and thus their sum is not always exactly 100%.…”

Section: Results: Mass Values and Atomic-mass Evaluationmentioning

confidence: 99%

Approaching theN=82shell closure with mass measurements of Ag and Cd isotopes

et al. 2010

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Mass measurements of neutron-rich Cd and Ag isotopes were performed with the Penning trap mass spectrometer ISOLTRAP. The masses of 112,[114][115][116][117][118][119][120][121][122][123][124]120,[122][123][124]126,128 Cd, determined with relative uncertainties between 2 × 10 −8 and 2 × 10 −7 , resulted in significant corrections and improvements of the mass surface. In particular, the mass of 124 Ag was previously unknown. In addition, other masses that had to be inferred from Q values of nuclear decays and reactions have now been measured directly. The analysis includes various mass differences, namely the two-neutron separation energies, the applicability of the Garvey-Kelson relations, double differences of masses δV pn , which give empirical proton-neutron interaction strengths, as well as a comparison with recent microscopic calculations. The δV pn results reveal that for even-even nuclides around 132 Sn the trends are similar to those in the 208 Pb region.

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“…After separating the secondary data, and reducing the system of data [2], we are left with a system of 1500 primary data for 800 nuclides to be treated by the least-squares method into which the AME pioneeringly plugged-in, since 1993, the 'Flow-of-Information' matrix [9]. It is a powerful method that allows tracing back, in the least-squares method, the contribution of each individual piece of data to each of the parameters (here the atomic masses).…”

Section: Data Entanglement -Mass Correlationsmentioning

confidence: 99%