PROTON–4He ELASTIC SCATTERING AT ~ 1 GeV

2005 ◽  
Vol 14 (05) ◽  
pp. 787-798 ◽  
Author(s):  
Z. A. KHAN ◽  
MINITA SINGH
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Phase Variation ◽  
Glauber Model ◽  
Slight Improvement ◽  
Polarization Data ◽  
Eikonal Expansion ◽  
Rotation Function

Based on the (spin-independent) Sugar–Blanckenbecler eikonal expansion for the T-matrix, we parametrize the (spin-dependent) NN amplitude (SNN) which successfully describes the pp and pn elastic scattering observables at ~ 1 GeV up to the available momentum transfers. Using SNN, we calculate the differential cross-section, polarization, and spin-rotation function of ~ 1 GeV protons on 4 He within the framework of the Glauber model. The analysis also includes the phase variation in the NN amplitude. It is found that the use of SNN, in comparision with the usually parametrized one-term amplitude, improves the agreement with the experimental data. The introduction of a global phase variation provides only a slight improvement over the results with a constant phase. However, if we allow different phases in the central- and spin-dependent parts of the NN amplitude, the agreement with the polarization data improves further without affecting the differential cross-section results.

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 p-4, 6, 8He AND p-6, 9, 11Li SCATTERING

2013 ◽  
Vol 22 (11) ◽  
pp. 1350082 ◽  
Author(s):  
Z. A. KHAN ◽  
DEEKSHA CHAUHAN ◽  
MINITA SINGH
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Scattering Data ◽  
Glauber Model ◽  
Neutron Density ◽  
Significant Discrepancy ◽  
Nucleon Density ◽  
Density Distributions ◽  
Dependent Part

Using the Coulomb modified Glauber model, we analyze the elastic scattering of protons from He and Li isotopes at 60 MeV and 72 MeV. The calculations require two inputs; the nucleon–nucleon (NN) amplitude and the nucleon density distributions in target nuclei. The central part of the NN amplitude is taken from the available NN scattering observables. To find the spin-dependent part, we employ p-4 He scattering data to fix its parameter values. For target nuclei, we use nucleon density distributions available in the literature. The NN amplitude, as obtained in this work, is then used to study the sensitivity of the calculated differential cross-section and polarization for p-6, 8 He scattering on the density distributions used. It is found that both the differential cross-section and polarization could provide a test to know which is the better choice of nucleon (especially neutron) density distributions. We also present the differential cross-sections for p-6, 9, 11 Li scattering at 60 MeV and 72 MeV in order to assess the suitability of the obtained NN amplitude. It is found that the results are in reasonable agreement with the experiment up to only moderate scattering angles, leaving significant discrepancy at large scattering angles. Our calculations suggest the need of medium modifications in the NN amplitude, arising due to Pauli blocking.

Differential Cross Section Measurements for the Elastic Scattering of Protons byN14

1957 ◽  
Vol 105 (1) ◽  
pp. 210-212 ◽  
Author(s):  
C. R. Bolmgren ◽  
G. D. Freier ◽  
J. G. Likely ◽  
K. F. Famularo
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross

Polarization and Differential Cross Section for Elastic Scattering of 40-MeV Protons. II

1967 ◽  
Vol 156 (4) ◽  
pp. 1207-1218 ◽  
Author(s):  
M. P. Fricke ◽  
E. E. Gross ◽  
B. J. Morton ◽  
A. Zucker
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Mev Protons

scholarly journals The scattering of alpha particles by helium

1959 ◽  
Vol 251 (1265) ◽  
pp. 143-155 ◽  
Keyword(s):  
Elastic Scattering ◽  
Phase Shift ◽  
Differential Cross Section ◽  
Excitation Energy ◽  
Cross Section ◽  
Differential Cross ◽  
Incident Energy ◽  
Phase Shifts ◽  
Alpha Particles

In order to obtain information about the levels of even spin and parity of 8 Be at energies above 11 MeV, the differential cross-section for the α-particle-helium elastic scattering has been measured at a series of beam energies from 23·1 to 38·4 MeV, for many c.m.s. angles between 30 and 90°. Phase shifts up to L = 8 have been calculated for each energy. Combining these results with previous figures for lower energies, the phase shifts δ 0 , δ 2 and δ 4 are thus known as functions of incident energy from 0·15 MeV to 38·4 MeV. The behaviour of the phase shift δ 4 confirms the existence of a previously suggested level with I = 4 at an excitation energy of about 11·4 MeV in 8 Be. The phase shifts δ 6 and δ 8 are small, as expected if the rotational series of levels in 8 Be term inates with I = 4.

Proton elastic scattering differential cross-section measurements of 45Sc

2011 ◽  
Vol 269 (24) ◽  
pp. 2994-2998 ◽  
Author(s):  
G. Provatas ◽  
A. Lagoyannis ◽  
S. Harissopulos ◽  
V. Foteinou ◽  
T. Konstantinopoulos ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Proton Elastic Scattering
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