Angular Distribution of α-Particles and Protons from Li6+D2

1951 ◽  
Vol 4 (3) ◽  
pp. 268
Author(s):  
DNF Dunbar ◽  
F Hirst
Keyword(s):  
Angular Distribution ◽  
Energy Range ◽  
Long Range ◽  
Potential Barrier ◽  
Legendre Polynomial ◽  
Short Range ◽  
Deuteron Energy ◽  
Angular Distributions ◽  
Α Particles ◽  
Complete Specification

The angular distribution of α-particles from Li6(d,α)He4 has been investigated for deuteron energies between 200 keV. and 1 MeV. The distribution may be represented by the expression������������������ N(θ)=N(90�)[1+A(E) cos2θ], where A(E) is a function of deuteron energy. The variation of A(E) with energy is due to the increasing penetration of the potential barrier by d deuterons. The angular distributions of the two groups of protons from Li6(d,p)Li7*, Li7 have been investigated in the same energy range. The distributions are complex and require d deuterons for their complete specification in the form �������������� N(θ) = a0P0 + a1P1 = a2P2 = a3P3 = a4P4where Pn is the Legendre polynomial of order n. The results appear to resolve some differences apparent in earlier work. There is no evidence that the short range proton distribution is more complex than that of the long range group.

scholarly journals Angular Distribution of Hydrogen Fragment Ions in H+ - H2 Collisions

1999 ◽  
Vol 52 (3) ◽  
pp. 537
Author(s):  
Bärbel Siegmann ◽  
Rainer Hippler
Keyword(s):  
Angular Distribution ◽  
Energy Range ◽  
Electron Capture ◽  
Angular Distributions ◽  
Fragment Ions ◽  
H2 Molecule

The angular distribution of H+ fragment ions produced in 5–25 keV H+–H2 collisions was investigated in coincidence with Lyman-α photons. The observed photons arise from electron capture to the projectile H(2p) state and/or from the fragmentation of the H2 molecule via 2sσg, 2pσu or 2pΠ u states of the excited H+2* ion. An analysis of the measured angular distributions has been performed to distinguish the separate degenerate channels available to an emitted Lyman-α photon. The results show similarities to the data of Lindsay et al. (1987) who measured the non-coincident angular distribution of H+ fragment ions within the same energy range.

Measurements of Neutron Polarizations for Deuteron Energies from 0.87 to 5.00 MeV

1972 ◽  
Vol 50 (8) ◽  
pp. 783-790 ◽  
Author(s):  
J. R. Smith ◽  
S. T. Thornton
Keyword(s):  
Energy Range ◽  
Liquid Helium ◽  
Legendre Polynomial ◽  
Measurement Techniques ◽  
Time Of Flight ◽  
Angular Distributions ◽  
Contour Maps ◽  
Neutron Time ◽  
Polarized Neutron ◽  
Polynomial Expansions

Neutron time-of-flight techniques have been used to measure [Formula: see text] polarization angular distributions for several deuteron energies from 0.87 to 5.00 MeV. Liquid helium served as the polarized neutron analyzer. From Legendre polynomial expansions of σ(Θ) and P(Θ)σ(Θ), contour maps of P(Θ) and P2(Θ)σ(Θ) have been produced for the energy range 0.87 to 5.00 MeV. Comparison with previous results and measurement techniques are discussed. Nucleon polarizations from the charge symmetric reactions [Formula: see text] and [Formula: see text] are compared.

THE ANGULAR DISTRIBUTION AND YIELD OF THE REACTION F19(p, α0)O16

1957 ◽  
Vol 35 (2) ◽  
pp. 155-167 ◽  
Author(s):  
R. L. Clarke ◽  
E. B. Paul
Keyword(s):  
Angular Distribution ◽  
Least Squares ◽  
Cross Sections ◽  
Legendre Polynomial ◽  
Ground State ◽  
Energy Region ◽  
Alpha Particles ◽  
Angular Distributions ◽  
Method Of Least Squares ◽  
Channel Spin

The yield of the ground state alpha particles from the F19(p, α0)O16 reaction has been studied from an energy of 1.3 Mev. to 2.7 Mev. The observed angular distributions were analyzed in terms of a Legendre polynomial expansion by the method of least squares. Six resonances were found in the energy region studied, at bombarding energies of 1.358 Mev., 1.709 Mev., 1.853 Mev., 2.11 Mev., 2.31 Mev., and 2.58 Mev. The widths and peak cross sections of these resonances are respectively: (54 ± 10 kev., 46 ± 5 mb.), (140 ± 5 kev., 55 ± 6 mb.), (132 ± 5 kev., 77 ± 8 mb.), (75 ± 25 kev., 10 ± 2 mb.), (80 ± 25 kev., 32 ± 5 mb.), and (300 ± 25 kev., 51 ± 10 mb.). Their spins, parities, channel spin mixtures, and partial widths are discussed.

ELASTIC SCATTERING OF ALPHA PARTICLES BY OXYGEN FOR INCIDENT ENERGIES BETWEEN 7.2 AND 8.5 MeV

1965 ◽  
Vol 43 (1) ◽  
pp. 111-121 ◽  
Author(s):  
G. J. McCallum ◽  
A. J. Ferguson
Keyword(s):  
Elastic Scattering ◽  
Energy Range ◽  
Alpha Particles ◽  
Angular Distributions ◽  
Α Particles

Angular distributions of α particles elastically scattered by 16O, obtained at 12 energies between 7.4 and 8.5 MeV, are presented together with the yield of scattered α particles measured by fixing the detectors at a given angle and varying the energy of the incident particles. Four such excitation curves in the energy-range 7.2–8.4 MeV are presented. Resonances are observed at energies 7.32, 7.66, 7.89, and 8.28 MeV. Tentative spin and parity assignments of 4+ and 2+ are obtained for the 7.89- and 8.28-MeV resonances.

The D-D cross-section and angular distribution between 55 and 430 keV

1953 ◽  
Vol 216 (1124) ◽  
pp. 66-71 ◽  
Keyword(s):  
Angular Distribution ◽  
Total Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Experimental Error ◽  
Forward Direction ◽  
Angular Distributions ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Gas Targets

The cross-section and angular distributions of protons from the D-D reaction using thin gas targets have been measured from 55 to 430 keV. The results have been expressed in the form σ θ = ( σ /4 π (1+⅓ A +1/5 B )) (1+ A cos 2 θ + B cos 4 θ). The variation of the total cross-section σ and the asymmetry coefficients A and B over the energy range 15 to 190 keV can be described by the theory of Beiduk, Pruett & Konopinski introducing only a small or negligible amount of spin-orbit coupling. The ratio of the number of 3 He’s to 3 H’s has been measured up to 250 keV at a few angles in the forward direction only, and found to be unity within experimental error.

scholarly journals Structural basis of long-range to short-range synaptic transition in NHEJ

Nature ◽  
2021 ◽  
Author(s):  
Siyu Chen ◽  
Linda Lee ◽  
Tasmin Naila ◽  
Susan Fishbain ◽  
Annie Wang ◽  
...  
Keyword(s):  
Long Range ◽  
Short Range ◽  
Structural Basis

scholarly journals Comparison of short-range order in irradiated dysprosium titanates

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Roman Sherrod ◽  
Eric C. O’Quinn ◽  
Igor M. Gussev ◽  
Cale Overstreet ◽  
Joerg Neuefeind ◽  
...  
Keyword(s):  
Long Range ◽  
Short Range ◽  
Structural Model ◽  
Ion Irradiation ◽  
Function Analysis ◽  
Ion Beam ◽  
Structural Response ◽  
Heavy Ion ◽  
Range Order ◽  
Radiation Resistant

AbstractThe structural response of Dy2TiO5 oxide under swift heavy ion irradiation (2.2 GeV Au ions) was studied over a range of structural length scales utilizing neutron total scattering experiments. Refinement of diffraction data confirms that the long-range orthorhombic structure is susceptible to ion beam-induced amorphization with limited crystalline fraction remaining after irradiation to 8 × 1012 ions/cm2. In contrast, the local atomic arrangement, examined through pair distribution function analysis, shows only subtle changes after irradiation and is still described best by the original orthorhombic structural model. A comparison to Dy2Ti2O7 pyrochlore oxide under the same irradiation conditions reveals a different behavior: while the dysprosium titanate pyrochlore is more radiation resistant over the long-range with smaller degree of amorphization as compared to Dy2TiO5, the former involves more local atomic rearrangements, best described by a pyrochlore-to-weberite-type transformation. These results highlight the importance of short-range and medium-range order analysis for a comprehensive description of radiation behavior.

SHORT-RANGE AND LONG-RANGE ORDER OF TITANIUM IN Ti1+xS2

1977 ◽  
Vol 38 (C7) ◽  
pp. C7-202-C7-206 ◽  
Author(s):  
R. MORET ◽  
M. HUBER ◽  
R. COMÈS
Keyword(s):  
Long Range ◽  
Short Range ◽  
Range Order ◽  
Long Range Order
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