Further Measurements of the Angular Distribution of a-Particles from the Li7(p,α)He4 Reaction

1951 ◽  
Vol 4 (3) ◽  
pp. 284
Author(s):  
F Hirst ◽  
R Uebergang
Keyword(s):  
Angular Distribution ◽  
Statistical Analysis ◽  
Energy Range ◽  
Spherical Symmetry ◽  
Proton Energy ◽  
Scintillation Counter ◽  
Energy Dependent ◽  
Combined Data

The angular distribution of the cc-particles from the Li7(p,α)He4 reaction has been measured for a proton energy range 0.3 to 0.9 MeV, using scintillation counter technique. A statistical analysis of the observations has been undertaken and results have been compared with those of other experiments. The angular distribution is well represented by the expression ������������ Y(θ) =Y(90�)[l +A(E)cos2θ + B(E)cos4θ], where A(E) and B(E) are energy dependent parameters denoting the departure from spherical symmetry and implying that p and f protons are important in the reaction. Curves of A(E) and B(E), of the theoretical form given by Inglis, have been fitted to the combined data of recent experiments analysed according to the above expression.

THE LOW LEVELS OF Si29

1957 ◽  
Vol 35 (9) ◽  
pp. 1042-1056 ◽  
Author(s):  
D. A. Bromley ◽  
H. E. Gove ◽  
A. E. Litherland ◽  
E. Almqvist ◽  
E. B. Paul
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation ◽  
Inelastic Scattering ◽  
Energy Range ◽  
Proton Energy ◽  
Branching Ratio ◽  
Decay Angular Distribution ◽  
Low Levels

Information on the low levels in Si29 has been obtained by studying the gamma radiation associated with the Si29(p, p′γ)Si29 inelastic-scattering reaction in the proton-energy range from 2.5 to 3.0 Mev. and with the Al29(β−)Si29 negatron decay. Angular-distribution measurements have shown that the 2.03 Mev. level in Si29 has spin 5/2, and are consistent with a 3/2 assignment to the 1.28 Mev. level. The E2/M1E2 branching ratio for the de-excitation of the 2.03 Mev. state has been measured to be approximately 100. Log ft values of < 5.2, > 6.5, and 5.2 have been determined for the branches of the Al29 decay to the 2.43, 2.03, and 1.28 Mev. states in Si29.

Study of the 1459-keV level in 19F by the 19F(p,p′γ)19F reaction

1970 ◽  
Vol 48 (7) ◽  
pp. 827-833 ◽  
Author(s):  
S. T. Lam ◽  
A. E. Litherland ◽  
J. J. Simpson
Keyword(s):  
Angular Distribution ◽  
Single Crystal ◽  
Linear Polarization ◽  
Proton Energy ◽  
Branching Ratios ◽  
Mixing Ratio ◽  
Γ Ray ◽  
Good Agreement

The 1459-keV level of 19F was populated by the 19F(p,p′γ)19F reaction at a proton energy of 2.78 MeV. The E2/M1 mixing ratio for the 1459 → 110 keV transition was determined to be [Formula: see text] from a combination of the γ-ray angular distribution and linear polarization and the nuclear lifetime. The γ-ray angular distribution was measured with a coaxial Ge(Li) detector and the γ-ray linear polarization with a planar Ge(Li) detector. The corresponding E2 and M1 transition strengths for a lifetime of 0.084 ± 0.020 ps are found to be [Formula: see text] and 0.10 ± 0.03 W.u. respectively. They are in good agreement with the particle–hole calculations of Benson and Flowers. The branching ratios of the 1459-keV level agree well with those of Poletti et al. The γ-ray transitions from the 1459-keV level provide a good example for demonstrating the usefulness of a single crystal Ge(Li) polarimeter.

Proton angular distribution research by a new angle-resolved proton energy spectrometer

2014 ◽  
Vol 57 (5) ◽  
pp. 844-848 ◽  
Author(s):  
LuNing Su ◽  
Yi Zheng ◽  
Meng Liu ◽  
ZhiDan Hu ◽  
WeiMin Wang ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Proton Energy ◽  
Energy Spectrometer

scholarly journals Excitation And Ionization By Auroral Protons

1966 ◽  
Vol 19 (3) ◽  
pp. 309 ◽  
Keyword(s):  
Magnetic Field ◽  
Energy Range ◽  
Pitch Angle ◽  
Proton Energy ◽  
Ionization Rate ◽  
Energy Spectra ◽  
Proton Fluxes ◽  
Atmospheric Ionization ◽  
The Magnetic Field

Height distributions are presented for the atmospheric ionization rate and Balmer radiation resulting from precipitation of auroral protons. These results have been computed assuming proton fluxes with several different energy spectra and pitch-angle distributions about the magnetic field, the total proton energy range being restricted to 1-1000 keY.

Anisotropy of the angular distribution of fragment ions in dissociative double photoionization of N2O molecules in the 30–50eV energy range

2007 ◽  
Vol 126 (20) ◽  
pp. 201101 ◽  
Author(s):  
M. Alagia ◽  
P. Candori ◽  
S. Falcinelli ◽  
M. Lavollée ◽  
F. Pirani ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Energy Range ◽  
Double Photoionization ◽  
Fragment Ions

scholarly journals FDMX: extended X-ray absorption fine structure calculations using the finite difference method

2016 ◽  
Vol 23 (2) ◽  
pp. 551-559 ◽  
Author(s):  
Jay D. Bourke ◽  
Christopher T. Chantler ◽  
Yves Joly
Keyword(s):  
Fine Structure ◽  
Energy Range ◽  
Cross Sections ◽  
Full Potential ◽  
Final State ◽  
X Ray ◽  
Complete Representation ◽  
Absorption Fine ◽  
Energy Dependent ◽  
X Ray Absorption

A new theoretical approach and computational package,FDMX, for general calculations of X-ray absorption fine structure (XAFS) over an extended energy range within a full-potential model is presented. The final-state photoelectron wavefunction is calculated over an energy-dependent spatial mesh, allowing for a complete representation of all scattering paths. The electronic potentials and corresponding wavefunctions are subject to constraints based on physicality and self-consistency, allowing for accurate absorption cross sections in the near-edge region, while higher-energy results are enabled by the implementation of effective Debye–Waller damping and new implementations of second-order lifetime broadening. These include inelastic photoelectron scattering and, for the first time, plasmon excitation coupling. This is the first full-potential package available that can calculate accurate XAFS spectra across a complete energy range within a single framework and without fitted parameters. Example spectra are provided for elemental Sn, rutile TiO2and the FeO6octahedron.

Measurement ofFe58(p,n)Co58reaction cross-section within the proton energy range of 3.38 to 19.63 MeV

2017 ◽  
Vol 964 ◽  
pp. 86-92 ◽  
Author(s):  
Reetuparna Ghosh ◽  
Sylvia Badwar ◽  
Bioletty Lawriniang ◽  
Betylda Jyrwa ◽  
Haldhara Naik ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Proton Energy

Measurement of the tensor analyzing power for the reaction γd → pnπ0

2019 ◽  
Vol 28 (01n02) ◽  
pp. 1950010 ◽  
Author(s):  
S. E. Lukonin ◽  
V. V. Gauzshtein ◽  
E. S. Karpenko ◽  
M. Ya. Kuzin ◽  
M. I. Levchuk ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Energy Range ◽  
Proton Energy ◽  
Electron Accelerator ◽  
Meson Photoproduction ◽  
Neutron Energy Range ◽  
Coincidence Counting ◽  
Gas Target ◽  
Protons And Neutrons ◽  
Analyzing Power

The paper discusses the results of measurement for three components of tensor analyzing power for the reaction of incoherent [Formula: see text]-meson photoproduction on a deuteron within the proton energy range of 15–200[Formula: see text]MeV and the neutron energy range of 15–150[Formula: see text]MeV. The experiment was performed on the deuterium internal gas target of VEPP-3 electron accelerator using the protons and neutrons coincidence counting technique. The results of measurements of the tensor analyzing power’s components are compared with the results of statistical modeling performed within the frameworks of a theoretical model.

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