Determination of the proton separation energy ofRh93from mass measurements

2008 ◽  
Vol 78 (2) ◽  
Author(s):  
J. Fallis ◽  
J. A. Clark ◽  
K. S. Sharma ◽  
G. Savard ◽  
F. Buchinger ◽  
...  
Keyword(s):  
Separation Energy ◽  
Mass Measurements ◽  
Proton Separation Energy

A new procedure for the determination of soil-water retention curves by continuous drying using high-suction tensiometers

2011 ◽  
Vol 48 (2) ◽  
pp. 327-335 ◽  
Author(s):  
S. D.N. Lourenço ◽  
D. Gallipoli ◽  
D. G. Toll ◽  
C. E. Augarde ◽  
F. D. Evans
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Water Retention ◽  
Soil Water Retention ◽  
Mass Measurements ◽  
Discrete Measurement ◽  
Wetting Process ◽  
High Suction

Soil-water retention curves (SWRCs) can be determined using high-suction tensiometers (HSTs) following two different procedures that involve either continuous or discrete measurement of suction. In the former case, suction measurements are taken while the sample is permanently exposed to the atmosphere and the soil is continuously drying. In the latter case, the drying or wetting process is halted at different stages to ensure equalization within the sample before measuring suction. Continuous drying has the advantage of being faster; however, it has the disadvantage that the accuracy of mass measurements (necessary for the determination of water content) is affected by the weight and stiffness of the cable connecting the HST to the logger. To overcome this problem, an alternative continuous drying procedure is presented in this paper in which two separate but nominally identical samples are used to obtain a single SWRC; one sample is used for the mass measurements, while a second sample is used for suction measurements. It is demonstrated that the new continuous drying procedure gives SWRCs that are similar to those obtained by discrete drying.

PARTICLE-NUMBER PROJECTED TWO-PROTON SEPARATION ENERGY OF THE PROTON-RICH EVEN–EVEN RARE-EARTH NUCLEI USING AN ISOVECTOR PAIRING APPROACH

2009 ◽  
Vol 18 (01) ◽  
pp. 141-160 ◽  
Author(s):  
S. KERROUCHI ◽  
D. MOKHTARI ◽  
N. H. ALLAL ◽  
M. FELLAH
Keyword(s):  
Rare Earth ◽  
Particle Number ◽  
Drip Line ◽  
Separation Energy ◽  
Line Position ◽  
Proton Separation Energy ◽  
Rare Earth Nuclei ◽  
Pairing Correlations ◽  
The One ◽  
Almost All

The two-proton separation energy (S2P) has been studied by describing the pairing correlations using four various approaches: in the pairing between like-particles case with (SBCS) and without (BCS) inclusion of the particle-number projection, as well as in the isovector pairing case with (NP-PROJ) and without (NP) inclusion of the particle-number projection. It has been numerically evaluated for the even–even rare-earth proton-rich nuclei such as Δnp ≠ 0. Among the four used methods, NP-PROJ is the one that provides the results that are closest to the experimental data when available. On the other hand, it has been shown that the S2P values deduced from the four approaches join, for almost all the considered elements, for the highest values of (N - Z). The fact that the BCS and NP (respectively, SBCS and NP-PROJ) values join may be explained by the fact that Δnp decreases with increasing values of (N - Z). It has also been shown that the BCS and SBCS (respectively, NP and NP-PROJ) values of S2P are very close because the discrepancy between the projected and unprojected energy values is quasi-constant as a function of the deformation. Finally, the four used methods lead to the same prediction of the two-proton drip-line position except for the Dysprosium and the Tungsten.

scholarly journals PROTON DRIPLINE FOR ISOTONE N = 18, 20, AND 22 USING MODIFIED RELATIVISTIC MEAN FIELD (MRMF) MODEL

2019 ◽  
Vol 4 (1) ◽  
pp. 1-10
Author(s):  
Jenny Primanita Diningrum ◽  
Anto Sulaksono
Keyword(s):  
Fermi Energy ◽  
Calculation Result ◽  
Research Result ◽  
Mean Field ◽  
Separation Energy ◽  
Relativistic Mean Field ◽  
Proton Separation Energy ◽  
Position Prediction

Determining the position of one- and two-proton dripline for isotone of N = 18, 20, and 22 has been studied through Modified Relativistic Mean Field (MRMF). The model exemplifies three impacts, namely isovector-isoscalar coupling, tensors, and electromagnetic exchange through five parameter set variations. The position of one- and two-proton dripline for the isotones is predicted by applying two methods, which are two-proton separation energy, and Fermi energy. The research shows that the prediction of one- and two-proton dripline for isotone of N = 18, and N = 20 is positioned at Z = 22 and Z = 26 consecutively.  Then, the prediction of one- and two-proton dripline for isotone of N = 22 has two positions, Z = 26 and Z = 28. The calculation result indicates that the position prediction for isotone of N = 18, N = 20, and N = 22 is following the research result conducted by Nazarewicz with RMF+NLSH model [1]. Meanwhile, isovector-isoscalar coupling, tensors, and electromagnetic exchange do not affect massively for the position prediction of two-proton dripline. However, the three methods affect one-proton dripline.

Electron impact studies. I. High resolution mass spectra of some unsaturated cyclic ketones

1966 ◽  
Vol 19 (9) ◽  
pp. 1619 ◽  
Author(s):  
JH Bowie
Keyword(s):  
High Resolution ◽  
Electron Impact ◽  
Mass Spectra ◽  
Cyclic Ketones ◽  
Mass Measurements ◽  
Exact Mass ◽  
Characteristic Fragmentation ◽  
Fragmentation Processes ◽  
Resolution Mass

The mass spectra of some 2-cyclohexen-1-ones, tetralones, and indanones have been investigated. The characteristic fragmentation processes, substantiated by appropriate metastable peaks, exact mass measurements, and in some cases by deuterium labelling studies, greatly facilitate the determination of both the type of system and the position of substituents on that system.

Proton Separation Energies for Some Rare Earth Isotopes

1975 ◽  
Vol 53 (10) ◽  
pp. 948-953 ◽  
Author(s):  
D. G. Burke ◽  
J. M. Balogh
Keyword(s):  
Rare Earth ◽  
Proton Transfer ◽  
Transfer Reactions ◽  
Separation Energy ◽  
Single Proton ◽  
Proton Separation Energy ◽  
Proton Transfer Reactions ◽  
The Absolute ◽  
Q Values

Reaction Q values for the (3He,d) and (α,t) single proton transfer reactions on targets of Gd, Dy, Er, and Yb have been measured with a magnetic spectrograph. Proton separation energies, Sp, are presented for 156,157,158,159,161Tb, 161,162,163,164,165Ho, 165,167,168,169,171Tm, and 171,172,173,174,175,177Lu. Although the uncertainties of the absolute Q values are approximately 15 keV, the use of isotopically mixed and natural targets resulted in probable errors of only 1–3 keV for the differences in Q values of the isotopes identified in each target. As the proton separation energy was previously known to within 1–3 keV for one isotope of each element studied, it is now possible to present SP values with errors of a few keV for ail the nuclides listed above.

Precision Determination of theC12-C13Neutron Separation Energy

1967 ◽  
Vol 161 (4) ◽  
pp. 1080-1082 ◽  
Author(s):  
W. V. Prestwich ◽  
R. E. Coté ◽  
G. E. Thomas
Keyword(s):  
Separation Energy ◽  
Precision Determination

scholarly journals Accurate Reference Gas Mixtures Containing Tritiated Molecules: Their Production and Raman-Based Analysis

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6170
Author(s):  
Simon Niemes ◽  
Helmut H. Telle ◽  
Beate Bornschein ◽  
Lucian Fasselt ◽  
Robin Größle ◽  
...  
Keyword(s):  
Exchange Reactions ◽  
Mass Measurements ◽  
Β Decay ◽  
Stable Species ◽  
Systematic Effects ◽  
Hydrogen Deuterium ◽  
Quantitative Analyses ◽  
Calibration Accuracy ◽  
Percent Accuracy

Highly accurate, quantitative analyses of mixtures of hydrogen isotopologues—both the stable species, H2, D2, and HD, and the radioactive species, T2, HT, and DT—are of great importance in fields as diverse as deuterium–tritium fusion, neutrino mass measurements using tritium β-decay, or for photonuclear experiments in which hydrogen–deuterium targets are used. In this publication we describe a production, handling, and analysis facility capable of fabricating well-defined gas samples, which may contain any of the stable and radioactive hydrogen isotopologues, with sub-percent accuracy for the relative species concentrations. The production is based on precise manometric gas mixing of H2, D2, and T2. The heteronuclear isotopologues HD, HT, and DT are generated via controlled, in-line catalytic reaction or by b-induced self-equilibration, respectively. The analysis was carried out using an in-line intensity- and wavelength-calibrated Raman spectroscopy system. This allows for continuous monitoring of the composition of the circulating gas during the self-equilibration or catalytic evolution phases. During all procedures, effects, such as exchange reactions with wall materials, were considered with care. Together with measurement statistics, these and other systematic effects were included in the determination of composition uncertainties of the generated reference gas samples. Measurement and calibration accuracy at the level of 1% was achieved.

scholarly journals The genetic determination of the economically useful characteristics of the cows of ukrainian black-and-white dairy breed

2018 ◽  
Vol 20 (89) ◽  
pp. 35-40 ◽  
Author(s):  
A. L. Shulyar
Keyword(s):  
Dairy Cows ◽  
Reproductive Capacity ◽  
Dairy Herds ◽  
Mass Measurements ◽  
Genetic Determination ◽  
Black And White ◽  
Holstein Breed ◽  
Private Research ◽  
Dairy Breed

The economically useful characteristics of dairy cows depend on many genetic, physiological, technological and environmental factors. The modern cow population of Ukrainian dairy cows was formed by using the improved Holstein breed. The contribution of this breed into both the creation and the improvement of Ukrainian black-and-white dairy breed is reflected in its genealogic structure, as the prevailing part of the lines is of Holstein origin. That’s why the estimation of animals of different lines and the male descendants of the bulls in service according to the main economically useful characteristics is one of the most topical matters concerning the improvement of the rate of genetic potential realization of the animals under peculiar conditions as well as of the formation of highly productive and profitable dairy herds. As it follows from mentioned above, the goal of our research was to determine the effects of the bulls in service and their belonging to the line on economically useful characteristics of the cows. The material for the research was the information concerning the breed and productive use of the cows of Ukrainian black-and-white dairy breed on the breeding plant of the private agrarian firm (PAF) “Yerchyky” of Zhytomyr oblast, as well as the results of private research. To make an analysis there was used the information about the cows which were lactating for the period of 7 years when the feeding and keeping conditions were similar ones. For the purpose of the research on the genetic determination of economically useful characteristics of the cows of Ukrainian black-and-white dairy breed, it has been made an analysis from among the groups of paternity and linear belonging. The comparison of group middle young cows’ indices from different bulls in service and cows of various linear belonging has been made on the live mass, measurements and indices of body constitution, on milk productivity and morpho-functional characteristics of the udder as well as on their reproductive capacity. A considerable and highly reliable level of intergroup differentiation of cows of various linear belonging as well as of half-sisters by the bull has been determined on the economically useful characteristics. By means of single-factor variance analysis it has been determined that the paternity has a significant effect on the economically useful characteristics of cows that stipulates 0.71–21.92% of total phenotypic changeability of the characteristics being taken into account, whereas the belonging to the line was 0.54–12.70%. The study of the effects of paternity and linear belonging of cows on the parameters of their life-long productivity will be the perspective of the further research.

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