PHOTONEUTRON CROSS SECTION OF Ni58

1959 ◽  
Vol 37 (5) ◽  
pp. 607-613 ◽  
Author(s):  
J. P. Roalsvig ◽  
R. N. H. Haslam ◽  
D. J. McKenzie
Keyword(s):  
Cross Section ◽  
Photon Energy ◽  
Half Life ◽  
Absolute Yield ◽  
Yield Value ◽  
The Absolute ◽  
The Cross ◽  
Maximum Photon

The reaction Ni58(γ, n)Ni57 has been investigated between 12- and 24-Mev maximum photon energy. The absolute yield value at 22 Mev was found to be much lower than reported previously. Also, a shorter half-life of Ni57 was obtained. The cross section was determined using two different methods.

Determination of the cross section forTb159(n,2n)Tb158and the half-life ofTb158

1984 ◽  
Vol 30 (3) ◽  
pp. 823-825 ◽  
Author(s):  
R. J. Prestwood ◽  
D. B. Curtis ◽  
D. J. Rokop ◽  
D. R. Nethaway ◽  
N. L. Smith
Keyword(s):  
Cross Section ◽  
Half Life ◽  
The Cross

Reaction cross section calculations via second beta decay using the activation method for the p-process

2019 ◽  
Vol 97 (11) ◽  
pp. 1206-1209
Author(s):  
Ezgi Tantoğlu ◽  
Nalan Özkan ◽  
R. Taygun Güray
Keyword(s):  
Beta Decay ◽  
Cross Section ◽  
Cross Sections ◽  
Half Life ◽  
Reaction Cross Section ◽  
Experimental Studies ◽  
Reaction Cross ◽  
Activation Method ◽  
Alternative Method ◽  
The Cross

There are 35 proton-rich isotopes between 74Se and 196Hg that cannot be synthesized through neutron captures and β− decays (s- and r-processes). A third process is therefore required for the production of these nuclei, the so-called p-process. The abundance and the origin of the p-nuclei are still not fully understood even though significant experimental and theoretical efforts in astrophysical modeling have been expended in the last two decades. The experimental studies with the activation method to measure cross sections of the relevant reactions have some limitations: the reaction product must be radioactive, should have an appropriate half-life, and its decay should be followed by proper γ-radiations. If the cross section cannot be calculated with the radiation followed by the first beta decay of the product, it can be measured using the second beta decay as an alternative method. In this study, the method and candidate reactions for the cross-section measurements via the second beta decay of the reaction product using the activation method are discussed.

A measurement of the cross section for production of He + (2 S ) ions by electron impact excitation of ground state helium ions

1966 ◽  
Vol 290 (1420) ◽  
pp. 74-93 ◽  
Keyword(s):  
Plane Wave ◽  
Cross Section ◽  
Cross Sections ◽  
Absolute Magnitude ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Close Coupling ◽  
Born Cross Section ◽  
The Absolute ◽  
The Cross

A crossed beams method has been used to measure the cross section for the production of He + (2 S ) by electrons incident upon He + (1 S ) in the energy range from threshold to 750 eV. The cross section was measured in arbitrary units with an accuracy of ± 5 % and at the higher energies its energy dependence is in close agreement with that calculated by means of the plane-wave Born approximation. Consequently the cross section has been normalized to the plane-wave Born cross section at energies between 435 and 750 eV to obtain the absolute magnitude. An independent estimate of the absolute magnitude was made to with in ± 30 % using only the experimental parameters, and the absolute cross sections given by the two methods agree within the experimental uncertainties. The normalized cross section is compared with cross sections given by the close-coupling approximation and various Coulomb-Born approximations. At the lower energies the normalized cross section is considerably smaller than any of the theoretical values, but the measurements are consistent with the existence of a finite cross section at threshold if the energy spread of the electron beam is taken in to account.

THE HALF-LIFE OF Ni63

1956 ◽  
Vol 34 (12) ◽  
pp. 1742-1746 ◽  
Author(s):  
C. C. McMullen ◽  
B. D. Pate ◽  
R. H. Tomlinson ◽  
L. Yaffe
Keyword(s):  
Cross Section ◽  
Half Life ◽  
Specific Activity ◽  
Disintegration Rate ◽  
Activity Determination ◽  
The Cross ◽  
Good Agreement

The half-life of Ni63 has been found by a specific activity determination to be 125 ± 6 years. The number of atoms of Ni63 was determined mass spectrometrically and the disintegration rate by 4πβ-counting. The cross section for the reaction Ni62(n, γ)Ni63 has been found to be 21 ± 2 barns, in good agreement with that found by Pomerance.

Electrical octupole Coulomb excitation in rhodium

1957 ◽  
Vol 239 (1219) ◽  
pp. 487-493 ◽  
Keyword(s):  
Energy Dependence ◽  
Cross Section ◽  
Isomeric State ◽  
Coulomb Excitation ◽  
Absolute Cross Section ◽  
The Absolute ◽  
The Cross ◽  
Octupole Excitation

The electric octupole excitation of the 40 keV isomeric state in 103 Rh has been observed with protons of energies 700 to 1200 keV. The energy dependence of the cross-section is consistent with that predicted by the W. K. B. treatment of Alder & Winther. The absolute cross-section is about three times that expected theoretically. Possible explanations for this discrepancy are suggested.

A new higher-order locking-free beam element based on the absolute nodal coordinate formulation

2017 ◽  
Vol 232 (19) ◽  
pp. 3410-3423 ◽  
Author(s):  
Haidong Yu ◽  
Chunzhang Zhao ◽  
Bin Zheng ◽  
Hao Wang
Keyword(s):  
Large Deformation ◽  
Cross Section ◽  
Absolute Nodal Coordinate Formulation ◽  
Beam Element ◽  
Higher Order ◽  
Continuity Condition ◽  
Large Rotation ◽  
Absolute Nodal Coordinate ◽  
The Absolute ◽  
The Cross

The beam elements based on the absolute nodal coordinate formulation are widely used in large deformation and large rotation problems. Some of them lead to shear and Poisson locking problems when the continuum mechanics method is employed to deduce the generalized elastic force of the element. To circumvent these locking problems, a new higher-order beam element is proposed that may capture the warping and non-uniform stretching distribution of the cross-section by introducing the trapezoidal cross-section deformation mode and increasing the order of interpolation polynomials in transverse direction. The curvature vectors are chosen as the nodal coordinates of the new element that improve the continuity condition at the element interface. Static and dynamic analyses are conducted to investigate the performance of the new element. Poisson locking phenomena may be eliminated effectively for the new element even when Poisson’s ratio is greater than zero. Meanwhile, the distortion deformation of the cross-section may be described directly. The new element has a better convergence performance compared with the spatial absolute nodal coordinate formulation beam element for that shear locking issue is eliminated. The results also show that the new element fulfills energy conservation and may be applied to the dynamics of both straight and initial curved structures with large deformation.

scholarly journals The Photoneutron Cross Section of Natural Osmium

1977 ◽  
Vol 30 (6) ◽  
pp. 677 ◽  
Author(s):  
Su Su ◽  
RH Sambell ◽  
EG Muirhead ◽  
BM Spicer
Keyword(s):  
Cross Section ◽  
Giant Dipole Resonance ◽  
Yield Data ◽  
Yield Curves ◽  
Dipole Resonance ◽  
Theoretical Predictions ◽  
Show Evidence ◽  
Bremsstrahlung Yield ◽  
The Absolute ◽  
The Cross

The absolute (y, xn) cross section of natural osmium is extracted from bremsstrahlung yield curves measured from the lowest (y, n) threshold of osmium isotopes up to 28 MeV in energy steps of 0�2 MeV. The VBPL method of Bramanis et al. (1972) has been used to unfold the cross section from bremsstrahlung yield data. The results do not show evidence of significant amounts of splitting of the giant dipole resonance, as might be expected from the theoretical predictions of Sedlmayr et al. (1974), but at the same time are not inconsistent with their general features.

scholarly journals Measurements of the absolute indices of refraction in strained glass

1910 ◽  
Vol 83 (566) ◽  
pp. 572-579 ◽  
Keyword(s):  
Plane Wave ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Vertical Plane ◽  
Bending Moment ◽  
The Other ◽  
Double Refraction ◽  
Light Passing ◽  
The Absolute ◽  
The Cross

1. In June, 1907, the author described a method by which the double-refraction in strained glass could be measured by observing the deviation of a ray of light passing through a slab of glass under flexure. If a slab or beam of glass of rectangular cross-section be bent in a vertical plane under a bending moment M, and if a plane wave be transmitted through the glass in a direction perpendicular to the plane of flexure, the light is broken up into two components, one polarised horizontally ( i. e . perpendicular to the cross-section and along the line of stress) and the other vertically.

scholarly journals The absolute photoionization cross section of the mercapto radical (SH) from threshold up to 15.0 eV

2019 ◽  
Vol 21 (46) ◽  
pp. 25907-25915 ◽  
Author(s):  
Helgi Rafn Hrodmarsson ◽  
Gustavo A. Garcia ◽  
Laurent Nahon ◽  
Jean-Christophe Loison ◽  
Bérenger Gans
Keyword(s):  
Cross Section ◽  
Photon Energy ◽  
Ionization Energy ◽  
Photoionization Cross Section ◽  
The Absolute

We present the absolute photoionization cross-section of the mercapto radical, SH, recorded from its first ionization energy at 10.4 eV up to a photon energy of 15 eV.

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