Non-proportional cross sections of 50Ti(p, p′) and 49Ti(d, p) reactions for magnetic dipole states of 50Ti

1985 ◽  
Vol 162 (4-6) ◽  
pp. 233-236
Author(s):  
Kazuo Muto
Keyword(s):  
Magnetic Dipole ◽  
Cross Sections

scholarly journals Polarized spectroscopy of electric and magnetic dipole transitions of Europium (III) ions in C2 sites

2021 ◽  
Vol 2086 (1) ◽  
pp. 012175
Author(s):  
A Volokitina ◽  
P Loiko ◽  
E Dunina ◽  
A Kornienko ◽  
J M Serres ◽  
...  
Keyword(s):  
Magnetic Dipole ◽  
Cross Sections ◽  
Luminescent Properties ◽  
Stimulated Emission ◽  
Laser Operation ◽  
Polarization Anisotropy ◽  
Selection Rules ◽  
Polarized Spectroscopy ◽  
Low Symmetry ◽  
Tungstate Crystal

Abstract Polarization anisotropy of luminescent properties of europium (III) ions in low-symmetry C2 sites is studied using monoclinic (sp. gr. C2/c) tungstate crystal KY(WO4)2. The 5D0 → 7FJ (where J = 0…6) transitions are characterized for the principal light polarizations. Polarization selection rules for the magnetic dipole 5D0 → 7F1 transition are presented. The stimulated-emission cross-sections for Eu3+ ions relevant for laser operation are determined.

Photoproduction of Gravitons in Static Electromagnetic Fields

1975 ◽  
Vol 53 (20) ◽  
pp. 2306-2311 ◽  
Author(s):  
G. Papini ◽  
S. -R. Valluri
Keyword(s):  
Magnetic Dipole ◽  
Electromagnetic Fields ◽  
Cross Sections ◽  
Gravitational Coupling ◽  
External Fields ◽  
Coupling Constant ◽  
Gauge Invariant ◽  
Gravitational Coupling Constant ◽  
Extended Sources ◽  
Divergence Free

The cross sections for the process of photoproduction of gravitons in Coulomb and magnetic dipole external fields have been calculated. The calculation, which is linear in the gravitational coupling constant κ, is completely covariant, manifestly gauge invariant, and divergence free. The results to this order in κ are exact. Expressions for the case of extended sources have also been obtained and found to be in agreement with the results of other authors.

scholarly journals Effect of nuclear magnetic distribution on thephoto production of longitudinally polarizedlepton-pairs in the field of Na2311 and Al2713 nuclei

2020 ◽  
Vol 24 (Suppl. 1) ◽  
pp. 139-147
Author(s):  
Sadah Alkhateeb
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Cross Sections ◽  
Magnetic Moment ◽  
Magnetic Dipole Moment ◽  
Nuclear Magnetic Moment ◽  
Lepton Pairs ◽  
Polarized Photons ◽  
Photo Production ◽  
Nuclear Magnetic

In this work we treat the influence of the nuclear magnetic moment on the photo production of e - e+, ?- ?+, ?- ?+ i. e. l- l+, lepton pairs. We examine the process: ? + N(Ze, ?j ) ? N(Ze, ?j ) + l-(p- ) + l+(p+) of production of (l- l+) - pairs by cir?cularly polarized photons ?(p?) in the field of nucleus, N, having electric (coulomb) charge Ze, and magnetic dipole moment ?j, where j is the nuclear spin. Taking into account the longitudinal polarizations of the produced pairs, we calculate the differential cross-sections for the angular and energy distributions of the pair particles. We investigate the effect of the nuclear magnetic moment on the angular and energy distribution of the antilepton l+(e+,?+,?+), showing that the contribution the cross-section from the nuclear magnetic dipole moment rises considerably on going to high energies of incident photon and large emission angles of the pair particles. The results of calculations for Na2311 (j =1/2) and Al2713 - target nuclei, and for the three lepton pair types (e - e+, ?- ?+, ?- ?+) are presented graphically [1, 2].

The capture γ-ray spectrum of Mg

1990 ◽  
Vol 68 (3) ◽  
pp. 261-267 ◽  
Author(s):  
W. V. Prestwich ◽  
T. J. Kennett
Keyword(s):  
Magnetic Dipole ◽  
Cross Sections ◽  
Electric Quadrupole ◽  
Capture Cross ◽  
Direct Capture ◽  
Γ Rays ◽  
Γ Ray ◽  
Capture Cross Sections

The capture γ rays of natural Mg are analyzed. The results indicate neutron separation energies of 7333.57 ± 0.07, 11 093.09 ± 0.08, and 6443.29 ± 0.12 keV for the 25Mg, 26Mg, and 27Mg products. From the primary intensities estimates of 51.5 ± 2.5 and 201 ± 9 mb for the 24Mg and 25Mg capture cross sections are deduced. Refined level energies for the three product isotopes are calculated and compared with previous results. Direct capture effects for electric and magnetic dipole and electric quadrupole transitions are discussed.

STUDYING γ*N→Δ→πN WITH CROSS SECTIONS AND POLARIZATION OBSERVABLES

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1686-1692
Author(s):  
SHALEV GILAD
Keyword(s):  
Phase Space ◽  
Magnetic Dipole ◽  
Cross Sections ◽  
Angular Distributions ◽  
Response Functions ◽  
P Waves ◽  
Model Calculations ◽  
Experimental Values ◽  
D Wave ◽  
Multipole Amplitudes

Preliminary results are presented of the reaction γ*N→Δ→πN that was studied at the Jefferson Laboratory for transferred four momentum of 1.0 (GeV/c)2. Angular distributions of the cross sections and polarizations were measured over much of the available phase space. Out of the eighteen response functions involved in this reaction, fourteen separate responses and two additional response combinations were extracted. All resonant and background multipole amplitudes were decomposed for s- and p-waves as well as several of the d-wave multipole amplitudes. The responses and multipoles were compared to model calculations. Significant differences were observed between the experimental values and those of the models for several of the responses and multipoles. The ratios of the electric and longitudinal quadrupole amplitudes to the magnetic dipole amplitude were extracted. These values are different from previously reported values.

scholarly journals Effect of nuclear magnetic distribution on thephoto production of longitudinally polarizedlepton-pairs in the field of Na2311 and Al2713 nuclei

2020 ◽  
Vol 24 (Suppl. 1) ◽  
pp. 139-147
Author(s):  
Sadah Alkhateeb
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Cross Sections ◽  
Magnetic Moment ◽  
Magnetic Dipole Moment ◽  
Nuclear Magnetic Moment ◽  
Lepton Pairs ◽  
Polarized Photons ◽  
Photo Production ◽  
Nuclear Magnetic

In this work we treat the influence of the nuclear magnetic moment on the photo production of e - e+, ?- ?+, ?- ?+ i. e. l- l+, lepton pairs. We examine the process: ? + N(Ze, ?j ) ? N(Ze, ?j ) + l-(p- ) + l+(p+) of production of (l- l+) - pairs by cir?cularly polarized photons ?(p?) in the field of nucleus, N, having electric (coulomb) charge Ze, and magnetic dipole moment ?j, where j is the nuclear spin. Taking into account the longitudinal polarizations of the produced pairs, we calculate the differential cross-sections for the angular and energy distributions of the pair particles. We investigate the effect of the nuclear magnetic moment on the angular and energy distribution of the antilepton l+(e+,?+,?+), showing that the contribution the cross-section from the nuclear magnetic dipole moment rises considerably on going to high energies of incident photon and large emission angles of the pair particles. The results of calculations for Na2311 (j =1/2) and Al2713 - target nuclei, and for the three lepton pair types (e - e+, ?- ?+, ?- ?+) are presented graphically [1, 2].

scholarly journals The capture of neutrons by deuterons

1948 ◽  
Vol 192 (1029) ◽  
pp. 156-166 ◽  
Keyword(s):  
Magnetic Dipole ◽  
Cross Section ◽  
Cross Sections ◽  
Group Structure ◽  
Wave Functions ◽  
Fast Neutrons ◽  
Dipole Radiation ◽  
Exchange Character ◽  
The Cross ◽  
High Degree

The cross-sections for capture of neutrons by deuterons, involving emission of both electric and magnetic dipole radiation, are calculated using the wave functions obtained by Buckingham & Massey (1941) in the course of an application of the resonating-group structure method to the elastic scattering of neutrons by deuterons. The value found for capture of neutrons with emission of magnetic dipole radiation is found to be very sensitive to the particular form taken for the various wave functions, owing to a very high degree of cancellation that occurs in the integrations. As a result it is out of the question at present to provide accurate theoretical values for this process. All that can be said is that the cross-section for capture of thermal neutrons by deuterons is likely to be abnormally small. It may well be 10 -28 cm. 2 or less. This is in general agreement with observation. For capture of fast neutrons with emission of electric dipole radiation there is much less uncertainty in the calculated values although the cross-sections are very small, of the order of a few times 10 -29 cm. 2. The actual value of the cross-section in this case depends on the assumed type of nucleonic interaction, i.e. whether it is of exchange character or not. Results are also given for the inverse process—the photodisintegration of the triton.

Magnetic dipole strength distribution and photon interaction cross sections in 140Ce

2001 ◽  
Vol 690 (1-3) ◽  
pp. 255-258 ◽  
Author(s):  
E. Guliyev ◽  
A.A. Kuliev ◽  
P. von Neumann-Cosel ◽  
Ö. Yavas
Keyword(s):  
Magnetic Dipole ◽  
Cross Sections ◽  
Strength Distribution ◽  
Dipole Strength ◽  
Photon Interaction ◽  
Interaction Cross Sections

Analysis of STEM micrographs of thick objects

1978 ◽  
Vol 36 (2) ◽  
pp. 106-107
Author(s):  
S. Golladay
Keyword(s):  
Inelastic Scattering ◽  
Multiple Scattering ◽  
Mass Distribution ◽  
Cross Sections ◽  
Phase Contrast ◽  
Image Point ◽  
Contrast Effects ◽  
Total Cross Sections ◽  
Elastic And Inelastic Scattering

The theory of multiple scattering has been worked out by Groves and comparisons have been made between predicted and observed signals for thick specimens observed in a STEM under conditions where phase contrast effects are unimportant. Independent measurements of the collection efficiencies of the two STEM detectors, calculations of the ratio σe/σi = R, where σe, σi are the total cross sections for elastic and inelastic scattering respectively, and a model of the unknown mass distribution are needed for these comparisons. In this paper an extension of this work will be described which allows the determination of the required efficiencies, R, and the unknown mass distribution from the data without additional measurements or models. Essential to the analysis is the fact that in a STEM two or more signal measurements can be made simultaneously at each image point.

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

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