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.

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.

scholarly journals Accurate Branching Ratio Measurements in 31P(P,g)32S

1975 ◽  
Vol 28 (4) ◽  
pp. 383 ◽  
Author(s):  
SG Boydell ◽  
DG Sargood
Keyword(s):  
Energy Range ◽  
Proton Energy ◽  
Gamma Ray ◽  
Branching Ratio ◽  
Branching Ratios

The reaction 3 1p(p, y)32S has been investigated in the proton energy range 0'4-1'75 MeV. Gamma ray spectra were measured for 2S resonances with Ge(Li) detectors which were carefully calibrated for relative peak efficiencies. Allowance was made for the effect of anisotropies in all the emitted y-rays. The spectra have been analysed to give branching ratios for bound and unbound levels. Comparisons made with previous work reveal some differences.

scholarly journals Accurate Branching Ratio Measurements in 23Na(p, g)24Mg

1975 ◽  
Vol 28 (4) ◽  
pp. 369 ◽  
Author(s):  
SG Boydell ◽  
DG Sargood
Keyword(s):  
Energy Range ◽  
Proton Energy ◽  
Gamma Ray ◽  
Branching Ratio ◽  
Branching Ratios

The reaction 23Na(p, y)24Mg has been investigated in the proton energy range O' 3-1' 75 MeV. Gamma ray spectra were measured for 22 resonances with Ge(Li) detectors which were carefully calibrated for relative peak efficiencies. Allowance was made for the effect of anisotropies in all the emitted y-rays. The speCtra have been analysed to give branching ratios for bound and unbound levels.

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

Angular Distribution of Photoelectrons from Gamma Radiation of 0.4 and 1.3 Mev

1954 ◽  
Vol 94 (2) ◽  
pp. 498-499 ◽  
Author(s):  
Arne Hedgran ◽  
Sölve Hultberg
Keyword(s):  
Angular Distribution ◽  
Gamma Radiation

Differential cross-section measurements in positron–argon collisions

1996 ◽  
Vol 74 (7-8) ◽  
pp. 505-508 ◽  
Author(s):  
R. M. Finch ◽  
Á. Kövér ◽  
M. Charlton ◽  
G. Laricchia
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Inelastic Scattering ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Coupling Effect ◽  
Channel Coupling ◽  
Scattering Cross

Differential cross sections for elastic scattering and ionization in positron–argon collisions as a function of energy (40–150 eV) are reported at 60°. Of particular interest is the energy range 55–60 eV, where earlier measurements by the Detroit group found a drop in the elastic-scattering cross section of a factor of 2. This structure has been tentatively attributed to a cross channel-coupling effect with an open inelastic-scattering channel, most likely ionization. Our results indicate that ionization remains an important channel over the same energy range and only begins to decrease at an energy above 60 eV.

Analysis of 12C(α, α′) using α condensate model wave function

2006 ◽  
Vol 21 (31n33) ◽  
pp. 2341-2346
Author(s):  
M. Takashina ◽  
Y. Sakuragi
Keyword(s):  
Wave Function ◽  
Angular Distribution ◽  
Excited State ◽  
Inelastic Scattering ◽  
Transition Density ◽  
Nuclear Radius ◽  
Oscillation Pattern ◽  
Model Wave Function ◽  
Model Wave

We analyze the inelastic scattering of the α+12 C system leading to the [Formula: see text] state in 12 C at incident energies of E α=139 MeV ~ 240 MeV using α condensate model wave function, and investigate the affection of the large nuclear radius of [Formula: see text] on the inelastic angular distribution. It is found that the oscillation pattern in inelastic angular distribution is sensitive to the extent of transition density rather than the nuclear radius of the excited state.

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