Nucleon separation and pairing energies, decay energies, and atomic masses for 68 ≤ Z ≤ 72

1977 ◽  
Vol 55 (15) ◽  
pp. 1360-1378 ◽  
Author(s):  
K. S. Sharma ◽  
J. O. Meredith ◽  
R. C. Barber ◽  
K. S. Kozier ◽  
S. S. Haque ◽  
...  
Keyword(s):  
Least Squares ◽  
Nuclear Reaction ◽  
Mass Difference ◽  
Atomic Mass ◽  
Mass Defect ◽  
Pairing Energy ◽  
Least Squares Adjustment ◽  
Proton Pairing ◽  
Q Values

A set of 24 precise determinations of mass spectroscopic doublet spacings, including a new determination of the 176Hf35Cl – 174Hf37Cl mass difference, has been combined with nuclear reaction and decay Q values in a least squares adjustment of the atomic mass differences in the region 68 ≤ Z ≤ 72. The following quantities have been calculated for each nuclide: separation energies for the last neutron and last pair of neutrons (Sn, S2n), the neutron pairing energy (Pn), separation energies for the last proton and last pair of protons (Sp, S2p), the proton pairing energy (Pp), Q values for α and β− decays, and the mass defect. The systematic variations of these quantities with N and Z are discussed.

Nucleon Separation and Pairing Energies, Decay Energies, and Atomic Masses for

1972 ◽  
Vol 50 (11) ◽  
pp. 1195-1219 ◽  
Author(s):  
J. O. Meredith ◽  
R. C. Barber
Keyword(s):  
Rare Earth ◽  
Least Squares ◽  
Nuclear Reaction ◽  
Mass Spectra ◽  
Atomic Mass ◽  
Pairing Energy ◽  
Least Squares Adjustment ◽  
The Masses ◽  
Proton Pairing ◽  
Q Values

A set of 45 precise determinations of doublet spacings in the mass spectra of rare-earth chlorides has been combined with existing nuclear reaction and decay Q values and atomic mass data in a least-squares adjustment of atomic mass differences. For nuclides in the region [Formula: see text] the following quantities have been calculated: separation energies for the last pair of neutrons and for the last neutron (S2n, Sn), the neutron pairing energy (Pn), separation energies for the last pair of protons and for the last proton (S2p, Sp), the proton pairing energy (Pp), Q values for α and β− decays, and the masses. The systematic variations of these quantities are illustrated and discussed.

Determination of the Ovality of Crude Oil Storage Tanks Using Least Squares

2011 ◽  
Vol 367 ◽  
pp. 475-483 ◽  
Author(s):  
R. Irughe Ehigiator ◽  
J.O. Ehiorobo ◽  
Ashraf A. Beshr ◽  
M.O. Ehigiator
Keyword(s):  
Crude Oil ◽  
Least Squares ◽  
Unbiased Estimate ◽  
Circular Cross Section ◽  
Field Measurements ◽  
Storage Tanks ◽  
Linear Measurements ◽  
Oil Storage ◽  
Least Squares Adjustment

In the processing of field measurements, the observations are adjusted using the least squares principle which gives unbiased estimate of the parameter sought together with their accuracies. In this paper, the use of the Least Squares model in the determination of the tank radius, centre point coordinates and ovality are discussed. The circular cross section of the crude oil storage tanks was divided into sixteen monitoring stations at equal intervals around the tank and at an elevation of 2m from the tank base. Total station instrument was then used to carry out angular and linear measurements by method of multiple intersection to reflectors held on the studs. The field measurements were post processed and adjustment of observation carried out by Least Squares adjustment method. The adjusted coordinates together with the computed radius were then used to determine tanks ovality. All data processing and adjustment were carried out with the aid of MATLAB Software for the 2003, 2004 and 2008 measurement epochs.The results of the study revealed an expansion of the tank shell between 2004 and 2008 measurement epoch. The radius of the tank was computed to be 38.187m in 2003 and 2004 and 38.205m in 2008 respectively.

Reply by the author to G. D. Garland.

Geophysics ◽  
1982 ◽  
Vol 47 (10) ◽  
pp. 1460-1460
Author(s):  
B. A. Sissons
Keyword(s):  
Least Squares ◽  
Standard Error ◽  
Gravitational Constant ◽  
Gravity Data ◽  
Residual Distribution ◽  
Density Measurements ◽  
Least Squares Fit ◽  
Least Squares Adjustment ◽  
Sufficient Precision

Although the Tokaanu experiment does contradict the proposal that the gravitational constant G increases with scale, the result is not significant. The standard error in the least‐squares adjustment is at least 1 percent, which exceeds the predicted variation in G. The uncertainty in mean density is nearer 5 percent. Gravity data with sufficient precision to test for a scale effect in G are obtainable; the main problem appears to be the uncertainty in density determinations. Stacey et al (1981) made a least‐squares determination of G using gravity and density measurements from a mine. However, the pattern of residuals obtained indicated the presence of anomalous masses not adequately accounted for by their density averaging. The method I have used which models the spatial variation in density offers the possibility of obtaining a least‐squares fit for G with a satisfactory residual distribution. However, the problem of the effect on bulk density of joints and voids not sampled in hand specimens remains.

scholarly journals Determination of the Atomic Mass of Phosphorus by a Nuclear Reaction Method

Nature ◽  
1952 ◽  
Vol 169 (4293) ◽  
pp. 235-235 ◽  
Author(s):  
F. A. EL-BEDEWI ◽  
R. MIDDLETON ◽  
C. T. TAI
Keyword(s):  
Nuclear Reaction ◽  
Atomic Mass ◽  
Reaction Method

Precise Atomic Mass Differences for

1974 ◽  
Vol 52 (23) ◽  
pp. 2386-2394 ◽  
Author(s):  
R. C. Barber ◽  
J. W. Barnard ◽  
D. A. Burrell ◽  
J. O. Meredith ◽  
F. C. G. Southon ◽  
...  
Keyword(s):  
High Resolution ◽  
Nuclear Reaction ◽  
Mass Spectrometer ◽  
Atomic Mass ◽  
Computer Assisted ◽  
Naturally Occurring ◽  
High Resolution Mass ◽  
High Resolution Mass Spectrometer ◽  
Q Values ◽  
Resolution Mass

A high resolution mass spectrometer has been used to determine new values for 16 atomic mass differences involving naturally occurring isotopes for [Formula: see text]. These new determinations, which were derived by means of a computer assisted peak matching system, have a precision ranging from 0.6 to 2.0 μu (0.6 to 1.8 keV) and thus are generally more precise than the corresponding nuclear reaction or decay Q values available in the region.

scholarly journals Direct determination of the atomic mass difference ofRe187andOs187for neutrino physics and cosmochronology

2014 ◽  
Vol 90 (4) ◽  
Author(s):  
D. A. Nesterenko ◽  
S. Eliseev ◽  
K. Blaum ◽  
M. Block ◽  
S. Chenmarev ◽  
...  
Keyword(s):  
Neutrino Physics ◽  
Mass Difference ◽  
Direct Determination ◽  
Atomic Mass

Precise atomic mass differences amongst isotopes of Hg, Tl, Pb, and Bi (and a least-squares mass evaluation for 78 ≤ Z ≤ 84)

1985 ◽  
Vol 63 (7) ◽  
pp. 966-972 ◽  
Author(s):  
V. P. Derenchuk ◽  
R. J. Ellis ◽  
K. S. Sharma ◽  
R. C. Barber ◽  
H. E. Duckworth
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Mass Spectrometer ◽  
Atomic Mass ◽  
Mass Spectral ◽  
Least Squares Adjustment ◽  
University Of Manitoba ◽  
The University ◽  
High Resolution Mass Spectrometer ◽  
Resolution Mass

The 1.00-m radius, high resolution mass spectrometer at the University of Manitoba has been used to determine the spacings of a series of mass spectral doublets. These give improved values for the mass differences between the stable nuclides in Tl, Pb, and Bi and relate these values to previous atomic masses and mass differences for the isotopes of Hg. A least-squares adjustment has been performed on all available atomic mass data (including the mass spectroscopic results from this laboratory) for the region 78 ≤ Z ≤ 84.

The determination of best values of the fundamental physical constants

2005 ◽  
Vol 363 (1834) ◽  
pp. 2105-2122 ◽  
Author(s):  
Barry N Taylor
Keyword(s):  
Least Squares ◽  
Science And Technology ◽  
Fundamental Constants ◽  
Fundamental Physical Constants ◽  
Physical Constants ◽  
Self Consistent ◽  
Modern Physics ◽  
Least Squares Adjustment ◽  
Fundamental Physical

The purpose of this paper is to provide an overview of how a self-consistent set of ‘best values’ of the fundamental physical constants for use worldwide by all of science and technology is obtained from all of the relevant data available at a given point in time. The basis of the discussion is the 2002 Committee on Data for Science and Technology (CODATA) least-squares adjustment of the values of the constants, the most recent such study available, which was carried out under the auspices of the CODATA Task group on fundamental constants. A detailed description of the 2002 CODATA adjustment, which took into account all relevant data available by 31 December 2002, plus selected data that became available by Fall of 2003, may be found in the January 2005 issue of the Reviews of Modern Physics . Although the latter publication includes the full set of CODATA recommended values of the fundamental constants resulting from the 2002 adjustment, the set is also available electronically at http://physics.nist.gov/constants .

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